diff options
Diffstat (limited to 'Master/texmf-dist/metapost/context/base/mp-chem.mpiv')
-rw-r--r-- | Master/texmf-dist/metapost/context/base/mp-chem.mpiv | 2074 |
1 files changed, 1462 insertions, 612 deletions
diff --git a/Master/texmf-dist/metapost/context/base/mp-chem.mpiv b/Master/texmf-dist/metapost/context/base/mp-chem.mpiv index cb595f2c661..2addb0a73ea 100644 --- a/Master/texmf-dist/metapost/context/base/mp-chem.mpiv +++ b/Master/texmf-dist/metapost/context/base/mp-chem.mpiv @@ -3,15 +3,15 @@ %D version=2009.05.13, %D title=\CONTEXT\ \METAPOST\ graphics, %D subtitle=chemicals, -%D author=Hans Hagen, +%D author=Hans Hagen \& Alan Braslau, %D date=\currentdate, -%D copyright=\PRAGMA] +%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}] %C %C This module is part of the \CONTEXT\ macro||package and is %C therefore copyrighted by \PRAGMA. See licen-en.pdf for %C details. -%D This module in incomplete and experimental. +%D This module is incomplete and experimental. % either consistent setting or not @@ -20,821 +20,1671 @@ if known context_chem : endinput ; fi ; boolean context_chem ; context_chem := true ; numeric - chem_width, chem_radical_min, chem_radical_max, chem_text_max, chem_circle_radius, - chem_rotation, chem_adjacent, chem_stack, chem_substituent, chem_direction, chem_setting_scale, - chem_setting_offset, chem_text_offset, chem_picture_offset, chem_center_offset, chem_substituent_offset, - chem_setting_l, chem_setting_r, chem_setting_t, chem_setting_b ; + chem_num[], % scratch + chem_text_min, chem_text_max, + chem_rotation, chem_adjacent, chem_stack_n, + chem_substituent, chem_substituent.lft, chem_substituent.rt, + chem_setting_offset, chem_text_offset, chem_picture_offset, + chem_center_offset, chem_dbl_offset, + chem_bb_angle, chem_axis_rulethickness, + chem_setting_l, chem_setting_r, chem_setting_t, chem_setting_b, + chem_setting_rotation, chem_emwidth, chem_b_length, + chem_front_b[] ; boolean chem_setting_axis, - chem_setting_fixedwidth, chem_setting_fixedheight, - chem_doing_pb, chem_text_trace ; + chem_doing_pb, chem_bd_wedge, + chem_star[], chem_front[], chem_stacked[], chem_tetra[] ; + +string + chem_previous ; path - chem_setting_bbox ; + chem_path[], % scratch + chem_b_path[], chem_c_path[], + chem_r_path[], chem_r_path.lft[], chem_r_path.rt[] ; pair - chem_shift, - chem_adjacent_p, chem_substituent_p, chem_direction_p, chem_move_p ; + chem_origin, chem_mirror, + chem_pair[], % scratch + chem_sb_pair, chem_sb_pair.m, chem_sb_pair.p, chem_sb_pair.b ; + +picture + chem_pic, % scratch + % The use of dashpattern is found to dot the starting point with chem_sb_dash.m... + %chem_sb_dash, chem_sb_dash.m, chem_sb_dash.p, chem_sb_dash.b, + chem_axis_color ; + +transform + chem_t ; % scratch + +color lightblue ; lightblue := (173/255,216/255,230/255) ; + +% debugging + +boolean chem_trace_nesting ; chem_trace_nesting := false ; +boolean chem_trace_text ; chem_trace_text := false ; +boolean chem_trace_boundingbox ; chem_trace_boundingbox := false ; + +chem_axis_color := image(draw origin withcolor lightblue) ; +chem_setting_axis := false ; +chem_axis_rulethickness := 1pt ; +chem_emwidth := 10pt ; % EmWidth or \the\emwidth does not work... +chem_b_length := 3 chem_emwidth ; +chem_text_offset := -.3chem_emwidth ; % -.71chem_emwidth ; % 1/sqrt(2) +chem_center_offset := .5 chem_emwidth ; +chem_picture_offset := chem_emwidth ; +chem_dbl_offset := .05 ; +chem_bb_angle := angle(1,2chem_dbl_offset) ; +chem_text_min := 0.75 ; +chem_text_max := 1.25 ; +chem_dot_factor := 4 ; % *linewidth +chem_sb_pair := (0.25,0.75) ; %chem_sb_dash := dashpattern(off 0.25 on 0.5 off 0.25) ; +chem_sb_pair.m := (0.25,1 ) ; %chem_sb_dash.m := dashpattern(off 0.25 on 0.75) ; +chem_sb_pair.p := (0 ,0.75) ; %chem_sb_dash.p := dashpattern(on 0.75 off 0.25) ; +chem_sb_pair.b := (0, 1 ) ; %chem_sb_dash.b := dashpattern(on 1) ; + +chem_bd_wedge := false ; % true is incorrect, but quite common... + +def chem_reset = + chem_rotation := 0 ; + chem_mirror := origin ; + chem_adjacent := 0 ; + chem_substituent := 0 ; + chem_substituent.lft := 0 ; + chem_substituent.rt := 0 ; + chem_stack_n := 0 ; + chem_doing_pb := false ; + chem_origin := origin ; + chem_previous := "one" ; + pair chem_mark_pair[] ; +enddef ; + +chem_reset ; + +newinternal numeric + one, carbon, alkyl, newmanstagger, newmaneclipsed, + three, four, five, six, seven, eight, nine, + fivefront, sixfront, chair, boat ; + +vardef chem_init_some (suffix $) (expr e) = + if not known chem_star[$] : chem_star[$] := false ; fi + if not known chem_front[$] : chem_front[$] := false ; fi + if not known chem_stacked[$] : chem_stacked[$] := false ; fi + if not known chem_tetra[$] : chem_tetra[$] := false ; fi + + % We define all paths as closed, so that they may be indexed mod length. + if path(e) : + chem_b_path[$] := e if not cycle(e) : -- cycle fi ; + chem_num0 := length(chem_b_path[$]) ; + else : % polygon + chem_num0 := e ; + chem_num1 := 360/chem_num0 ; + chem_b_path[$] := + ( + for i=0 upto chem_num0-1 : + dir(if chem_star[$] : -i else : (.5-i) fi *chem_num1) -- + endfor + cycle + ) + if chem_front[$] : + rotated (chem_num1-90) + fi + if not chem_star[$] : + scaled (.5/(sind .5chem_num1)) + fi ; + fi ; -numeric - chem_width[], chem_angle[], chem_start[], chem_initialrot[], chem_initialmov[] ; + if chem_front[$] and (not known chem_front_b[$]) : + chem_front_b[$] := floor(.5(length chem_b_path[$])) + 1 ; + fi -pair - chem_stack_d[], - chem_b_zero[], chem_n_zero[], - chem_r_max[], chem_r_min[], - chem_r_zero[], chem_mr_zero[], chem_pr_zero[], chem_crz_zero[], - chem_rt_zero[], chem_rtt_zero[], chem_rbt_zero[], - chem_mid_zero[] ; + chem_num2 := 0 ; + chem_c_path[$] := + reverse(fullcircle) rotated angle(point 0 of chem_b_path[$]) + if not chem_star[$] : + hide (for i=0 upto chem_num0-1: + if abs(point i+.5 of chem_b_path[$]) < + abs(point chem_num2+.5 of chem_b_path[$]) : + chem_num2 := i ; + fi + endfor) + scaled (2*(abs(point chem_num2+.5 of chem_b_path[$]) - chem_dbl_offset)) + fi ; -path - chem_b_path[], chem_bx_path[], chem_eb_path[], chem_sr_path[], chem_br_path[], - chem_sb_path[], chem_msb_path[], chem_psb_path[], - chem_s_path[], chem_ss_path[], chem_mss_path[], chem_pss_path[], - chem_e_path[], chem_sd_path[], chem_bb_path[], chem_oe_path[], - chem_bd_path[], chem_bw_path[], - chem_ddt_path[], chem_ddb_path[], chem_ldt_path[], chem_ldb_path[], chem_rdt_path[], chem_rdb_path[], - chem_dbl_path[], chem_dbr_path[], - chem_ad_path[], chem_au_path[], - chem_r_path[], chem_rl_path[], chem_rr_path[], - chem_rb_path[], chem_prb_path[], chem_mrb_path[], - chem_srl_path[], chem_srr_path[], - chem_msr_path[], chem_psr_path[], - chem_mr_path[], chem_pr_path[], - chem_c_path[], chem_cc_path[], - chem_midt_path[], chem_midb_path[], chem_midst_path[], chem_midsb_path[] ; - -chem_setting_scale := 1 ; -chem_base_width := 40pt ; -chem_text_offset := 3pt ; -chem_center_offset := 6pt ; -chem_picture_offset := 10pt ; -chem_substituent_offset := 10pt ; -chem_radical_min := 1.25 ; -chem_radical_max := 1.50 ; -chem_text_min := 0.75 ; -chem_text_max := 1.75 ; -chem_circle_radius := 0.80 ; -chem_circle_radius := 1.10 ; -chem_rotation := 1 ; -chem_adjacent := 0 ; -chem_substituent := 0 ; -chem_direction := 0 ; -chem_stack_n := 0 ; -chem_doing_pb := false ; -chem_shift := origin ; -chem_dot_factor := 4 ; -chem_text_trace := false ; -chem_bd_n := 4 ; -chem_bw_n := 4 ; -chem_bd_angle := 4 ; -chem_bb_angle := 4 ; - -vardef chem_start_structure(expr n, l, r, t, b, scale, axis, fixedwidth, fixedheight, offset) = - chem_setting_axis := axis ; - chem_setting_l := l * scale ; - chem_setting_r := r * scale ; - chem_setting_t := t * scale ; - chem_setting_b := b * scale ; - chem_setting_fixedwidth := fixedwidth ; - chem_setting_fixedheight := fixedheight ; - chem_setting_offset := offset ; - if scale <> chem_setting_scale : - chem_setting_scale := scale ; - chem_init_all ; - fi ; - chem_rotation := 1 ; - chem_adjacent := 0 ; - chem_substituent := 0 ; - chem_direction := 0 ; - chem_stack_n := 0 ; - chem_doing_pb := false ; - chem_shift := origin ; -enddef ; - -def chem_stop_structure = - currentpicture := currentpicture shifted - chem_shift ; - % axis here - if chem_setting_fixedwidth : - chem_setting_l := - xpart llcorner currentpicture ; - chem_setting_r := xpart urcorner currentpicture ; + chem_r_path[$] := + if chem_star[$] : + chem_b_path[$] + else : + ( + for i=0 upto chem_num0-1 : + (unitvector point i of chem_b_path[$]) + shifted point i of chem_b_path[$] -- + endfor + cycle + ) + fi ; + + chem_r_path.lft[$] := + ( + for i=0 upto chem_num0-1 : + if chem_front[$] : + up + scaled .5 + shifted point i of chem_b_path[$] + elseif chem_star[$] : + point i of chem_b_path[$] + else : + point i+1 of chem_b_path[$] + rotatedabout(point i of chem_b_path[$],180) + fi -- + endfor + cycle + ) ; + chem_r_path.rt[$] := + ( + for i=0 upto chem_num0-1 : + if chem_front[$] : + down + scaled .5 + shifted point i of chem_b_path[$] + elseif chem_star[$] : + point i+2 of chem_b_path[$] + else : + point i-1 of chem_b_path[$] + rotatedabout(point i of chem_b_path[$],180) + fi -- + endfor + cycle + ) ; + +enddef ; + +% The following is used only once: +def chem_init_all = +begingroup + save a, b, c, d, e ; numeric a, b, c, d, e ; + save lft, rt ; path lft, rt ; + + % tetrahedrial angle + a := 2angle(1,sqrt 2) ; + + % solve for chair + 2b = 180 - .5a ; + 4c = 180 - .5a ; + d + e = 360 - 2a ; + d = 5e ; % this is the one tunable parameter which fixes the perspective. + z2 = z1 shifted dir(90+a+d) ; + z3 = z2 shifted dir(270-a) ; + z4 = z3 shifted dir(90+a) ; + z6 = z1 shifted dir(90+a) ; + z5 = z6 shifted dir(270-a) ; + z4 = z1 xyscaled (-1,-1) ; + z5 = z2 xyscaled (-1,-1) ; + + save indx ; numeric indx ; indx = 2 ; % starting value doesn't matter, really. + % polygons + three := incr indx ; % 3 (these numbers don't matter - they are just indices) + four := incr indx ; % 4 + five := incr indx ; % 5 + six := incr indx ; % 6 + seven := incr indx ; % 7 + eight := incr indx ; % 8 + nine := incr indx ; % 9 + + chem_init_some(three,3) ; + chem_init_some(four, 4) ; + chem_init_some(five, 5) ; + chem_init_some(six, 6) ; + chem_init_some(seven,7) ; + chem_init_some(eight,8) ; + chem_init_some(nine, 9) ; + + % star-form + one := incr indx ; % 10 + carbon := incr indx ; % 11 + alkyl := incr indx ; % 12 + newmanstagger := incr indx ; % 13 + newmaneclipsed := incr indx ; % 14 + + chem_star[one] := true ; + chem_star[carbon] := true ; chem_tetra[carbon] := true ; + chem_star[alkyl] := true ; chem_tetra[alkyl] := true ; + chem_star[newmanstagger] := true ; chem_tetra[newmanstagger] := true ; + chem_star[newmaneclipsed] := true ; chem_tetra[newmaneclipsed] := true ; + chem_stacked[newmanstagger] := true ; + chem_stacked[newmaneclipsed] := true ; + chem_init_some(one, 8) ; + chem_init_some(carbon, dir(0)--dir(360-a)--dir(180-.5a+b)--dir(180-.5a)) ; + chem_init_some(alkyl, dir(0)--dir(360-a)--dir(360-a-90)--dir(90)) ; + chem_init_some(newmanstagger, dir(30)--dir(270)--dir(150)--dir(330)--dir(210)--dir(90)) ; + chem_init_some(newmaneclipsed, dir(30)--dir(270)--dir(150)--dir(0)--dir(240)--dir(120)) ; + + % front views + fivefront := incr indx ; % 15 + sixfront := incr indx ; % 16 + chair := incr indx ; % 17 + boat := incr indx ; % 18 + + chem_front[fivefront] := true ; chem_front_b[fivefront] := 3 ; + chem_front[sixfront] := true ; chem_front_b[sixfront] := 3 ; + chem_init_some(fivefront,5) ; + chem_init_some(sixfront, 6) ; + % chair + chem_front[chair] := true ; chem_front_b[chair] := 4 ; + chem_init_some(chair, z1--z2--z3--z4--z5--z6) ; + lft := dir(90-a)--down--dir(90+a+d)--down--dir(90+a)--down ; + rt := up--dir(270+a)--up--dir(270-a)--up--dir(90+e) ; + chem_r_path.lft[chair] := + for i=0 upto 5 : point i of lft shifted point i of chem_b_path[chair] -- endfor + cycle ; + chem_r_path.rt[chair] := + for i=0 upto 5 : point i of rt shifted point i of chem_b_path[chair] -- endfor + cycle ; + % boat + chem_front[boat] := true ; chem_front_b[boat] := 4 ; + chem_init_some(boat, + for i=1 upto 4 : point i-1 of chem_b_path[sixfront] -- endfor + point 2 of chem_b_path[sixfront] yscaled .5 -- + point 1 of chem_b_path[sixfront] yscaled .5 + ) ; + lft := dir(30+.5a)--dir(330+.5a)--dir(210-.5a)--dir(150-.5a)--dir(120)--dir(60) ; + rt := dir(30-.5a)--dir(330-.5a)--dir(210+.5a)--dir(150+.5a)--dir(120+a)--dir(60-a) ; + chem_r_path.lft[boat] := + for i=0 upto 5 : point i of lft shifted point i of chem_b_path[boat] -- endfor + cycle ; + chem_r_path.rt[boat] := + for i=0 upto 5 : point i of rt shifted point i of chem_b_path[boat] -- endfor + cycle ; +endgroup +enddef ; + +chem_init_all ; % WHY does this not work unless defined and then called? + + +% Like most often in ConTeXt, we will trap but then silently ignore mistaken use, +% unless of course the error be too harmful... + +% \startchemical + +def chem_start_structure(expr i, l, r, t, b, rotation, unit, factor, offset, axis, rulethickness, axiscolor) = + save chem_setting_l, chem_setting_r, chem_setting_t, chem_setting_b ; + + chem_emwidth := unit ; + chem_b_length := factor * unit ; + if numeric l : + chem_setting_l := -l ; + fi + if numeric r : + chem_setting_r := r ; + fi + if numeric t : + chem_setting_t := t ; + fi + if numeric b : + chem_setting_b := -b ; + fi + chem_setting_rotation := rotation ; + chem_setting_offset := offset ; + chem_setting_axis := if boolean axis : axis else : (axis<>0) fi ; + chem_axis_rulethickness := .75*(rulethickness) ; % axis 50% thinner than frame and bonds. + chem_axis_color := image(draw origin withcolor axiscolor) ; % so we handle all color models + + chem_reset ; +enddef ; + +% \stopchemical + +vardef chem_stop_structure = + % Make sure that all of the saved stack has been restored... (this was a gotcha!) + forever : + exitif chem_stack_n=0 ; + chem_restore ; + endfor + + currentpicture := (currentpicture shifted -chem_origin) rotated chem_setting_rotation ; + + save l, r, b, t ; + l := min(xpart llcorner currentpicture, xpart lrcorner currentpicture) ; + r := max(xpart llcorner currentpicture, xpart lrcorner currentpicture) ; + b := min(ypart llcorner currentpicture, ypart ulcorner currentpicture) ; + t := max(ypart llcorner currentpicture, ypart ulcorner currentpicture) ; + + if unknown chem_setting_l : chem_setting_l := l ; fi + if unknown chem_setting_r : chem_setting_r := r ; fi + if unknown chem_setting_b : chem_setting_b := b ; fi + if unknown chem_setting_t : chem_setting_t := t ; fi + + if chem_setting_axis : % put it behind the picture + chem_pic := currentpicture ; currentpicture := nullpicture ; + chem_num0 := .5chem_b_length ; + chem_num1 := .2chem_num0 ; + % draw the axes to the bounding box of the entire structure, + % not necessarily the bounding box of the final figure + draw (l,0) -- (r,0) + withpen pencircle scaled chem_axis_rulethickness withcolor colorpart(chem_axis_color) ; + draw (0,b) -- (0,t) + withpen pencircle scaled chem_axis_rulethickness withcolor colorpart(chem_axis_color) ; + for i = 0 step chem_num0 until r : + draw (i,-chem_num1) -- (i,chem_num1) + withpen pencircle scaled chem_axis_rulethickness withcolor colorpart(chem_axis_color) ; + endfor + for i = 0 step -chem_num0 until l : + draw (i,-chem_num1) -- (i,chem_num1) + withpen pencircle scaled chem_axis_rulethickness withcolor colorpart(chem_axis_color) ; + endfor + for i = 0 step chem_num0 until t : + draw (-chem_num1,i) -- (chem_num1,i) + withpen pencircle scaled chem_axis_rulethickness withcolor colorpart(chem_axis_color) ; + endfor + for i = 0 step -chem_num0 until b : + draw (-chem_num1,i) -- (chem_num1,i) + withpen pencircle scaled chem_axis_rulethickness withcolor colorpart(chem_axis_color) ; + endfor + addto currentpicture also chem_pic ; fi ; - if chem_setting_fixedheight : - chem_setting_t := ypart urcorner currentpicture ; - chem_setting_b := - ypart llcorner currentpicture ; + if chem_trace_boundingbox : + fill boundingbox currentpicture withcolor blue withtransparency(1,.25) ; fi ; - chem_setting_bbox := - (-chem_setting_l,-chem_setting_b) -- ( chem_setting_r,-chem_setting_b) -- - ( chem_setting_r, chem_setting_t) -- (-chem_setting_l, chem_setting_t) -- cycle ; - % maybe put it behind the picture - if chem_setting_axis : - save stp ; stp := chem_base_width/ 2 * chem_setting_scale ; - save siz ; siz := chem_base_width/10 * chem_setting_scale ; - draw (-chem_setting_l,0) -- (chem_setting_r,0) withcolor blue ; - draw (0,-chem_setting_b) -- (0,chem_setting_t) withcolor blue ; - for i = 0 step stp until chem_setting_r : draw (i,-siz) -- (i,siz) withcolor blue ; endfor ; - for i = 0 step -stp until -chem_setting_l : draw (i,-siz) -- (i,siz) withcolor blue ; endfor ; - for i = 0 step stp until chem_setting_t : draw (-siz,i) -- (siz,i) withcolor blue ; endfor ; - for i = 0 step -stp until -chem_setting_b : draw (-siz,i) -- (siz,i) withcolor blue ; endfor ; - draw chem_setting_bbox withcolor blue ; + setbounds currentpicture to + ((chem_setting_l,chem_setting_b) -- (chem_setting_r,chem_setting_b) -- + (chem_setting_r,chem_setting_t) -- (chem_setting_l,chem_setting_t) -- cycle) ; + if chem_trace_boundingbox : + fill boundingbox currentpicture withcolor red withtransparency(1,.25) ; fi ; - setbounds currentpicture to chem_setting_bbox ; enddef ; -def chem_start_component = enddef ; -def chem_stop_component = enddef ; +% \chemical + +vardef chem_start_component = enddef ; +vardef chem_stop_component = enddef ; -def chem_pb = -% draw boundingbox currentpicture withpen pencircle scaled 1mm withcolor blue ; -% draw origin withpen pencircle scaled 2mm withcolor blue ; +vardef chem_pb = % PB : + if chem_trace_nesting : + draw boundingbox currentpicture + withpen pencircle scaled 1mm withcolor colorpart(chem_axis_color) ; + draw origin withpen pencircle scaled 2mm withcolor colorpart(chem_axis_color) ; + fi ; chem_doing_pb := true ; enddef ; -def chem_pe = -% draw boundingbox currentpicture withpen pencircle scaled .5mm withcolor red ; -% draw origin withpen pencircle scaled 1mm withcolor red ; - currentpicture := currentpicture shifted - chem_shift ; -% draw origin withpen pencircle scaled .5mm withcolor green ; - chem_shift := origin ; +vardef chem_pe = % PE + if chem_trace_nesting : + draw boundingbox currentpicture withpen pencircle scaled .5mm withcolor red ; + draw origin withpen pencircle scaled 1mm withcolor red ; + fi ; + currentpicture := currentpicture shifted -chem_origin ; + if chem_trace_nesting : + draw origin withpen pencircle scaled .5mm withcolor green ; + fi ; + chem_origin := origin ; chem_doing_pb := false ; enddef ; -vardef chem_do (expr p) = - if chem_doing_pb : +vardef chem_do (expr pos) = + if (unknown chem_doing_pb) or (not chem_doing_pb) : + pos + else : chem_doing_pb := false ; -% save pp ; pair pp ; pp := point 1 of ((origin -- p) enlonged chem_picture_offset) ; -% currentpicture := currentpicture shifted - pp ; -% chem_shift := chem_shift - center pp ; - currentpicture := currentpicture shifted - p ; - chem_shift := chem_shift - p ; + currentpicture := currentpicture shifted -pos ; + chem_origin := chem_origin shifted -pos ; origin % nullpicture - else : - p fi enddef ; -vardef chem_b (expr n, f, t, r, c) = - chem_draw (n, chem_b_path[n], f, t, r, c) ; -enddef ; -vardef chem_sb (expr n, f, t, r, c) = - chem_draw (n, chem_sb_path[n], f, t, r, c) ; +picture chem_stack_p[] ; +pair chem_stack_origin[], chem_stack_mirror[] ; +numeric chem_stack_rotation[] ; +string chem_stack_previous[] ; + +vardef chem_save = % SAVE + chem_stack_p [incr chem_stack_n] := currentpicture ; + chem_stack_origin [ chem_stack_n] := chem_origin ; chem_origin := origin ; + chem_stack_rotation[ chem_stack_n] := chem_rotation ; + chem_stack_mirror [ chem_stack_n] := chem_mirror ; + chem_stack_previous[ chem_stack_n] := chem_previous ; + currentpicture := nullpicture ; enddef ; -vardef chem_s (expr n, f, t, r, c) = - chem_draw (n, chem_s_path[n], f, t, r, c) ; +vardef chem_restore = % RESTORE + if chem_stack_n>0 : + currentpicture := currentpicture shifted -chem_origin ; + addto chem_stack_p [chem_stack_n] also currentpicture ; + currentpicture := chem_stack_p [chem_stack_n] ; + chem_stack_p[chem_stack_n] := nullpicture ; + chem_origin := chem_stack_origin [chem_stack_n] ; + chem_rotation := chem_stack_rotation[chem_stack_n] ; + chem_mirror := chem_stack_mirror [chem_stack_n] ; + chem_previous := chem_stack_previous[chem_stack_n] ; + chem_stack_n := chem_stack_n - 1 ; + fi ; enddef ; -vardef chem_ss (expr n, f, t, r, c) = - chem_draw (n, chem_ss_path[n], f, t, r, c) ; -enddef ; +% chem_adj and chem_sub are to be followed by chem_set(n) which does all the work... -vardef chem_mid (expr n, r, c) = - chem_draw_fixed (n, chem_midt_path[n], r, c) ; - chem_draw_fixed (n, chem_midb_path[n], r, c) ; +vardef chem_adj (suffix $) (expr d, s) = % ADJ + % scale s is ignored (for now?) + if not chem_front[$] : + chem_substituent := 0 ; + chem_substituent.lft := 0 ; + chem_substituent.rt := 0 ; + chem_adjacent := d ; + fi enddef ; -vardef chem_mids (expr n, r, c) = - chem_draw_fixed (n, chem_midst_path[n], r, c) ; - chem_draw_fixed (n, chem_midsb_path[n], r, c) ; +vardef chem_lsub (suffix $) (expr d, s) = % LSUB + chem_sub.lft($,d,s) ; enddef ; -vardef chem_mss (expr n, f, t, r, c) = - chem_draw (n, chem_mss_path[n], f, t, r, c) ; +vardef chem_rsub (suffix $) (expr d, s) = % RSUB + chem_sub.rt ($,d,s) ; enddef ; -vardef chem_pss (expr n, f, t, r, c) = - chem_draw (n, chem_pss_path[n], f, t, r, c) ; +vardef chem_sub@# (suffix $) (expr d, s) = % SUB + % scale s is ignored (for now?) + chem_adjacent := 0 ; + chem_substituent := 0 ; + chem_substituent.lft := 0 ; + chem_substituent.rt := 0 ; + % then : + chem_substituent@# := d ; enddef ; -vardef chem_msb (expr n, f, t, r, c) = - chem_draw (n, chem_msb_path[n], f, t, r, c) ; +def chem_transformed (suffix $) = % not vardef! + scaled chem_b_length + if not chem_front[$] : + if chem_mirror<>origin : reflectedabout(origin,chem_mirror) fi + rotated chem_rotation + fi enddef ; -vardef chem_psb (expr n, f, t, r, c) = - chem_draw (n, chem_psb_path[n], f, t, r, c) ; +vardef chem_draw (expr what, r, c) (text extra) = + draw what + withpen pencircle scaled r + withcolor c %\MPcolor{c} + extra ; enddef ; -vardef chem_eb (expr n, f, t, r, c) = - chem_draw (n, chem_eb_path[n], f, t, r, c) ; +vardef chem_fill (expr what, r, c) (text extra) = + fill what + withpen pencircle scaled r + withcolor c %\MPcolor{c} + extra ; enddef ; -vardef chem_db (expr n, f, t, r, c) = - if n = 1 : - chem_draw (n, chem_msb_path [n], f, t, r, c) ; - chem_draw (n, chem_psb_path [n], f, t, r, c) ; - else : - chem_draw (n, chem_dbl_path [n], f, t, r, c) ; - chem_draw (n, chem_dbr_path [n], f, t, r, c) ; - fi ; +vardef chem_drawarrow (expr what, r, c) (text extra) = + drawarrow what + withpen pencircle scaled r + withcolor c %\MPcolor{c} + extra ; enddef ; -vardef chem_er (expr n, f, t, r, c) = - chem_draw (n, chem_rl_path[n], f, t, r, c) ; - chem_draw (n, chem_rr_path[n], f, t, r, c) ; -enddef ; +vardef chem_set (suffix $) = + forsuffixes P = scantokens chem_previous : -vardef chem_dr (expr n, f, t, r, c) = - chem_draw (n, chem_srl_path[n], f, t, r, c) ; - chem_draw (n, chem_srr_path[n], f, t, r, c) ; -enddef ; + % This is a fairly complicated optimization and ajustement. It took some + % thinking to get right, so beware! -vardef chem_ad (expr n, f, t, r, c) = - chem_draw_arrow(n, chem_ad_path[n], f, t, r, c) ; -enddef ; + if (chem_adjacent<>0) and chem_star[P] and chem_star[$] : + % nop + chem_adjacent := 0 ; + elseif (chem_adjacent<>0) and (chem_front[P] or chem_front[$]) : + % not allowed for FRONT + chem_adjacent := 0 ; + elseif chem_adjacent<>0 : + chem_substituent := 0 ; + chem_substituent.lft := 0 ; + chem_substituent.rt := 0 ; + % move to the bond midpoint of the first structure + chem_pair0 := center ( + if chem_star[P] : + origin -- point (chem_adjacent-1) + else : + subpath (chem_adjacent-1,chem_adjacent) + fi + of chem_b_path[P] + ) chem_transformed(P) ; + % find the closest opposite bond of the second structure + chem_pair1 := chem_pair0 rotated if chem_star[P] : 90 else : 180 fi ; + chem_num0 := abs(chem_pair1) ; + chem_num1 := if chem_tetra[$] : 1 else : length chem_b_path[$] fi ; + % only consider even indices (cardinal points) for ONE + chem_num2 := if chem_star[$] and not chem_tetra[$] : 2 else : 1 fi ; + for i=0 step chem_num2 until chem_num1 : + chem_pair2 := ( + ( + unitvector + center ( + if chem_star[$] : + origin -- point i + else : + subpath (i,i+1) + fi + of chem_b_path[$]) + ) + scaled chem_num0 + ) chem_transformed($) ; + if i=0 : + chem_pair3 := chem_pair2 ; + chem_num3 := 0 ; + elseif (abs(chem_pair1 shifted -chem_pair2)) < (abs(chem_pair1 shifted -chem_pair3)) : + chem_pair3 := chem_pair2 ; + chem_num3 := i ; + fi + endfor + if chem_star[$] : + chem_pair4 := chem_pair0 shifted + -((point (chem_adjacent-1) of chem_b_path[P]) chem_transformed(P)) ; + fi + % adjust the bond angles + chem_rotation := (chem_rotation + angle(chem_pair1)-angle(chem_pair3)) mod 360 ; + if not chem_star[$] : + chem_pair4 := + if chem_star[P] : + (point chem_num3 + else : + center(subpath (chem_num3,chem_num3+1) + fi + of chem_b_path[$]) + chem_transformed($) ; + fi + if not chem_star[P] : + chem_pair4 := chem_pair4 shifted -chem_pair0 ; + fi + currentpicture := currentpicture shifted chem_pair4 ; + chem_origin := chem_origin shifted chem_pair4 ; + chem_adjacent := 0 ; + fi ; -vardef chem_au (expr n, f, t, r, c) = - chem_draw_arrow(n, chem_au_path[n], f, t, r, c) + % Insure that only one, if any, will be nonzero + if ((chem_substituent <> 0) and (chem_substituent.lft <> 0)) or + ((chem_substituent <> 0) and (chem_substituent.rt <> 0)) or + ((chem_substituent.lft <> 0) and (chem_substituent.rt <> 0)) : + chem_substituent := 0 ; + chem_substituent.lft := 0 ; + chem_substituent.rt := 0 ; + fi + if (chem_substituent <> 0) or (chem_substituent.lft <> 0) or (chem_substituent.rt <> 0) : + % move origin to radical endpoint of the first structure + if chem_substituent.lft > 0 : + chem_pair0 := point chem_substituent.lft-1 of chem_r_path.lft[P] ; + chem_substituent := chem_substituent.lft ; + chem_substituent.lft := 0 ; + elseif chem_substituent.rt > 0 : + chem_pair0 := point chem_substituent.rt-1 of chem_r_path.rt[P] ; + chem_substituent := chem_substituent.rt ; + chem_substituent.rt := 0 ; + else : + chem_pair0 := point chem_substituent-1 of chem_r_path[P] ; + fi + chem_pair1 := chem_pair0 if not chem_star[P] : + shifted -(point chem_substituent-1 of chem_b_path[P]) fi ; + chem_t := identity chem_transformed(P) ; + chem_pair0 := chem_pair0 transformed chem_t ; % radical + chem_pair1 := chem_pair1 transformed chem_t ; % recentered (see below) + currentpicture := currentpicture shifted -chem_pair0 ; + chem_origin := chem_origin shifted -chem_pair0 ; + if (not (chem_star[P] and chem_star[$])) or chem_tetra[P] or chem_tetra[$] : + if chem_tetra[P] and chem_tetra[$] and ((chem_substituent=1) or (chem_substituent=2)): + chem_rotation := (chem_rotation + 180) mod 360 ; % trans-alkane + chem_pair2 := (point .5 of chem_b_path[$]) ; % bisector, not chem_transformed + if chem_mirror=origin : + chem_mirror := chem_pair2 ; + else : + chem_num0 := angle(chem_mirror)-angle(chem_pair2) ; + if (chem_num0>0) and (chem_num0> 180) : + chem_num0 := 360 - chem_num0 ; + elseif (chem_num0<0) and (chem_num0<-180) : + chem_num0 := -360 - chem_num0 ; + fi + chem_rotation := (chem_rotation + 2chem_num0) mod 360 ; + chem_mirror := origin ; + fi + fi + chem_t := identity chem_transformed($) ; + chem_pair1 := chem_pair1 rotated 180 ; % opposite direction of radical bond + % find the closest node + chem_num0 := abs(chem_pair1) ; % distance + % search to find the nearest node of $; only consider 1 and 2 for CARBON,ALKYL + chem_num1 := if chem_tetra[$] : 1 else : length chem_b_path[$] fi ; + % only consider even indices (cardinal points) for ONE + chem_num2 := if chem_star[$] and not chem_tetra[$] : 2 else : 1 fi ; + for i=0 step chem_num2 until chem_num1 : + chem_pair2 := (unitvector(point i of chem_b_path[$]) scaled chem_num0) + transformed chem_t ; + if i=0 : + chem_pair3 := chem_pair2 ; + chem_num3 := 0 ; + elseif (abs(chem_pair1 shifted -chem_pair2)) < + (abs(chem_pair1 shifted -chem_pair3)) : + chem_pair3 := chem_pair2 ; + chem_num3 := i ; + fi + endfor + if not chem_front[$] : % adjust rotation + chem_rotation := (chem_rotation + angle(chem_pair1)-angle(chem_pair3)) mod 360 ; + fi ; + chem_t := identity chem_transformed($) ; + chem_pair4 := (point chem_num3 of chem_b_path[$]) transformed chem_t ; + if not chem_star[$] : + currentpicture := currentpicture shifted chem_pair4 ; + chem_origin := chem_origin shifted chem_pair4 ; + fi + fi + chem_substituent := 0 ; + fi ; + endfor + chem_previous := str $ ; enddef ; -vardef chem_r (expr n, f, t, r, c) = - if n < 0 : - chem_draw_vertical (n, chem_r_path[n], f, t, r, c) ; +% line (f_rom, t_o, r_ule, c_olor) + +vardef chem_b@# (suffix $) (expr f, t, r, c) = % B + if chem_star[$] : + chem_r@#($,f,t,r,c) ; + elseif length(str @#)>0 : + chem_sb@#($,f,t,r,c) ; else : - chem_draw (n, chem_r_path[n], f, t, r, c) ; - fi ; + chem_draw( + (subpath (f-1,t) of chem_b_path[$]) chem_transformed($), + r,c,) ; + fi enddef ; -vardef chem_rd (expr n, f, t, r, c) = - chem_dashed_normal (n, chem_r_path[n], f, t, r, c) +vardef chem_sb@# (suffix $) (expr f, t, r, c) = % SB + if chem_star[$] : + chem_sr@#($,f,t,r,c) ; + else : + %chem_draw( + % (subpath (f-1,t) of chem_b_path[$]) chem_transformed($), + % r,c,dashed chem_sb_dash@# scaled chem_b_length) ; + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_draw( + (subpath (chem_sb_pair@# shifted (i-1,i-1)) of chem_b_path[$]) + transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_mrd (expr n, f, t, r, c) = - chem_dashed_normal (n, chem_mr_path[n], f, t, r, c) +vardef chem_sd@# (suffix $) (expr f, t, r, c) = % SD + if chem_star[$] : + chem_rd@#($,f,t,r,c) ; + else : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_draw( + (subpath (chem_sb_pair@# shifted (i-1,i-1)) of chem_b_path[$]) + transformed chem_t, + r,c,dashed evenly) ; + endfor + fi enddef ; -vardef chem_prd (expr n, f, t, r, c) = - chem_dashed_normal (n, chem_pr_path[n], f, t, r, c) +vardef chem_r_fragment@# (suffix $) (expr i) = + ( + if chem_star[$] : + origin + else : + point i-1 of chem_b_path[$] + fi -- + point i-1 of chem_r_path@#[$] + ) % no ; enddef ; -vardef chem_br (expr n, f, t, r, c) = - chem_fill (n, chem_br_path[n], f, t, r, c ) +vardef chem_r@# (suffix $) (expr f, t, r, c) = % R + if length(str @#)>0 : + chem_sr@#($,f,t,r,c) ; + else : + chem_sr.b($,f,t,r,c) ; + fi enddef ; -vardef chem_rb (expr n, f, t, r, c) = - chem_fill (n, chem_rb_path[n], f, t, r, c) +vardef chem_er@# (suffix $) (expr f, t, r, c) = % ER + if length(str @#)>0: + chem_dr@#($,f,t,r,c) ; + else : + chem_dr.b($,f,t,r,c) ; + fi enddef ; -vardef chem_mrb (expr n, f, t, r, c) = - chem_fill (n, chem_mrb_path[n], f, t, r, c) +vardef chem_dr@# (suffix $) (expr f, t, r, c) = % DR + if not chem_front[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := (subpath chem_sb_pair@# of chem_r_fragment($,i)) ; + chem_draw( + (chem_path0 paralleled chem_dbl_offset) transformed chem_t, + r,c,) ; + chem_draw( + (chem_path0 paralleled -chem_dbl_offset) transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_prb (expr n, f, t, r, c) = - chem_fill (n, chem_prb_path[n], f, t, r, c) +vardef chem_lr@# (suffix $) (expr f, t, r, c) = % LR + if length(str @#)>0 : + chem_lsr@#($,f,t,r,c) ; + else : + chem_lsr.b($,f,t,r,c) ; + fi enddef ; -vardef chem_mr (expr n, f, t, r, c) = - if n < 0 : - chem_draw_vertical(n, chem_mr_path[n], f, t, r, c) +vardef chem_rr@# (suffix $) (expr f, t, r, c) = % RR + if length(str @#)>0 : + chem_rsr@#($,f,t,r,c) ; else : - chem_draw (n, chem_mr_path[n], f, t, r, c) + chem_rsr.b($,f,t,r,c) ; fi enddef ; -vardef chem_pr (expr n, f, t, r, c) = - if n < 0 : - chem_draw_vertical(n, chem_pr_path[n], f, t, r, c) - else : - chem_draw (n, chem_pr_path[n], f, t, r, c) +vardef chem_eb@# (suffix $) (expr f, t, r, c) = % EB + if not chem_star[$] : + %chem_draw( + % ((subpath (f-1,t) of chem_b_path[$]) paralleled -2chem_dbl_offset) + % chem_transformed($), + % r,c,dashed chem_sb_dash scaled chem_b_length) ; + for i=f upto t : + chem_t := identity chem_transformed($) ; + chem_draw( + ((subpath (chem_sb_pair@# shifted (i-1,i-1)) of chem_b_path[$]) + paralleled -2chem_dbl_offset) transformed chem_t, + r,c,) ; + endfor fi enddef ; -vardef chem_sr (expr n, f, t, r, c) = - chem_draw (n, chem_sr_path[n], f, t, r, c) +vardef chem_ad@# (suffix $) (expr f, t, r, c) = % AD + if not chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_drawarrow( + ((subpath (chem_sb_pair@# shifted (i-1,i-1)) of chem_b_path[$]) + paralleled 2chem_dbl_offset) transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_msr (expr n, f, t, r, c) = - chem_draw (n, chem_msr_path[n], f, t, r, c) +vardef chem_au@# (suffix $) (expr f, t, r, c) = % AU + if not chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_drawarrow( + reverse( + (subpath (chem_sb_pair@# shifted (i-1,i-1)) of chem_b_path[$]) + paralleled 2chem_dbl_offset) transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_psr (expr n, f, t, r, c) = - chem_draw (n, chem_psr_path[n], f, t, r, c) +vardef chem_es@# (suffix $) (expr f, t, r, c) = % ES + if chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_draw( + ((point i-1 of chem_r_path[$]) scaled (xpart chem_sb_pair)) transformed chem_t, + chem_dot_factor*r,c,) ; + endfor + fi enddef ; -vardef chem_c (expr n, f, t, r, c) = - chem_draw (n, chem_c_path[n], f, t, r, c) +vardef chem_ed@# (suffix $) (expr f, t, r, c) = % ED + chem_t := identity chem_transformed($) ; + for i=f upto t : + if chem_star[$] : + chem_path0 := subpath chem_sb_pair of chem_r_fragment($,i) ; + chem_draw( + (point 0 of (chem_path0 paralleled -chem_dbl_offset)) transformed chem_t, + chem_dot_factor*r,c,) ; + chem_draw( + (point 0 of (chem_path0 paralleled chem_dbl_offset)) transformed chem_t, + chem_dot_factor*r,c,) ; + else : + chem_draw( + ((subpath (chem_sb_pair shifted (i-1,i-1)) of chem_b_path[$]) + paralleled -2chem_dbl_offset) transformed chem_t, + r,c,dashed evenly) ; + fi + endfor +enddef ; + +vardef chem_ep@# (suffix $) (expr f, t, r, c) = % EP + if chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair of chem_r_fragment($,i) ; + chem_draw( + (point 0 of (chem_path0 paralleled -chem_dbl_offset) -- + point 0 of (chem_path0 paralleled chem_dbl_offset)) transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_cc (expr n, f, t, r, c) = - chem_draw (n, chem_cc_path[n], f, f, r, c) +vardef chem_et@# (suffix $) (expr f, t, r, c) = % ET + if chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair of chem_r_fragment($,i) ; + chem_draw( + (point 0 of (chem_path0 paralleled -2chem_dbl_offset)) transformed chem_t, + chem_dot_factor*r,c,) ; + chem_draw( + (point 0 of chem_path0) transformed chem_t, + chem_dot_factor*r,c,) ; + chem_draw( + (point 0 of (chem_path0 paralleled 2chem_dbl_offset)) transformed chem_t, + chem_dot_factor*r,c,) ; + endfor + fi enddef ; -vardef chem_cd (expr n, f, t, r, c) = - chem_dashed_connected (n, chem_c_path[n], f, t, r, c) +vardef chem_db@# (suffix $) (expr f, t, r, c) = % DB + if chem_star[$] : + chem_dr@#($,f,t,r,c) ; + elseif not chem_front[$] : + chem_t := identity chem_transformed($) ; + %chem_draw( + % ((subpath (f-1,t) of chem_b_path[$]) paralleled -chem_dbl_offset) + % transformed chem_t, + % r,c,dashed chem_sb_dash@# scaled chem_b_length) ; + %chem_draw( + % ((subpath (f-1,t) of chem_b_path[$]) paralleled chem_dbl_offset) + % transformed chem_t, + % r,c,dashed chem_sb_dash@# scaled chem_b_length) ; + for i=f upto t : + chem_path0 := subpath (chem_sb_pair@# shifted (i-1,i-1)) of chem_b_path[$] ; + chem_draw( + (chem_path0 paralleled -chem_dbl_offset) transformed chem_t, + r,c,) ; + chem_draw( + (chem_path0 paralleled chem_dbl_offset) transformed chem_t, + r,c,) ; + % todo : this should be cut-off where it overlaps a neighboring standard bond. + endfor + fi enddef ; -vardef chem_ccd (expr n, f, t, r, c) = - chem_dashed_normal (n, chem_cc_path[n], f, f, r, c) +vardef chem_tb@# (suffix $) (expr f, t, r, c) = % TB + if chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair@# of chem_r_fragment($,i) ; + chem_draw( + (chem_path0 paralleled -2chem_dbl_offset) transformed chem_t, + r,c,) ; + chem_draw( + chem_path0 transformed chem_t, + r,c,) ; + chem_draw( + (chem_path0 paralleled 2chem_dbl_offset) transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_rn (expr n, i, t) = - chem_rt (n,i,t) ; +vardef chem_sr@# (suffix $) (expr f, t, r, c) = % SR + chem_t := identity chem_transformed($) ; + if chem_stacked[$] : + chem_num0 := length chem_b_path[$] ; chem_num1 := floor(.5chem_num0) ; + for i=f upto t : + chem_draw( + (subpath (if i>chem_num1: .5,ypart fi chem_sb_pair@#) of chem_r_fragment($,i)) + transformed chem_t, + r,c,) ; + endfor + else : + for i=f upto t : + chem_draw( + (subpath chem_sb_pair@# of chem_r_fragment($,i)) + transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_rtn (expr n, i, t) = - chem_rtt(n,i,t) ; +vardef chem_rd@# (suffix $) (expr f, t, r, c) = % RD + chem_t := identity chem_transformed($) ; + if chem_stacked[$] : + chem_num0 := length chem_b_path[$] ; chem_num1 := floor(.5chem_num0) ; + for i=f upto t : + chem_draw( + (subpath (if i>chem_num1: .5,ypart fi chem_sb_pair@#) of chem_r_fragment($,i)) + transformed chem_t, + r,c,dashed evenly) ; + endfor + else : + for i=f upto t : + chem_draw( + (subpath chem_sb_pair@# of chem_r_fragment($,i)) + transformed chem_t, + r,c,dashed evenly) ; + endfor + fi enddef ; -vardef chem_rbn (expr n, i, t) = - chem_rbt(n,i,t) ; +vardef chem_rh@# (suffix $) (expr f, t, r, c) = % RH + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_draw( + (subpath chem_sb_pair@# of chem_r_fragment($,i)) + transformed chem_t, + chem_dot_factor*r,c,dashed withdots scaled ((.5chem_b_length/3)/5bp)) ; + % not symmetric - needs to be tweaked... + endfor +enddef ; + +vardef chem_lrh@# (suffix $) (expr f, t, r, c) = % LRH + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_draw( + (subpath chem_sb_pair@# of chem_r_fragment.lft($,i)) + transformed chem_t, + chem_dot_factor*r,c,dashed withdots scaled ((.5chem_b_length/3)/5bp)) ; + % not symmetric - needs to be tweaked... + endfor +enddef ; + +vardef chem_rrh@# (suffix $) (expr f, t, r, c) = % RRH + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_draw( + (subpath chem_sb_pair@# of chem_r_fragment.rt($,i)) + transformed chem_t, + chem_dot_factor*r,c,dashed withdots scaled ((.5chem_b_length/3)/5bp)) ; + % not symmetric - needs to be tweaked... + endfor +enddef ; + +vardef chem_hb@# (suffix $) (expr f, t, r, c) = % HB + if chem_star[$] : + chem_rh@#($,f,t,r,c) + fi enddef ; -vardef chem_tb (expr n, f, t, r, c) = % one - chem_draw (n, chem_msb_path[n], f, t, r, c) ; - chem_draw (n, chem_sb_path [n], f, t, r, c) ; - chem_draw (n, chem_psb_path[n], f, t, r, c) ; +vardef chem_bb@# (suffix $) (expr f, t, r, c) = % BB + if chem_star[$] : + chem_rb@#($,f,t,r,c) ; + elseif chem_front[$] : + chem_t := identity chem_transformed($) ; + chem_draw( + (subpath (f-1,t) of chem_b_path[$]) transformed chem_t, + r,c,) ; + chem_num0 := length chem_b_path[$] ; % total number of bonds + chem_num1 := chem_front_b[$] ; % number of bonds to be made bold + % bold bonds within f and t + chem_num2 := if f<0 :((f+1) mod chem_num0) + chem_num0 else : ((f-1) mod chem_num0) + 1 fi ; + chem_num3 := if t<0 :((t+1) mod chem_num0) + chem_num0 else : ((t-1) mod chem_num0) + 1 fi ; + if chem_num3<chem_num2 : + chem_num4 := chem_num3 ; + chem_num3 := chem_num2 ; + chem_num2 := chem_num4 ; + fi + if chem_num2<chem_num1 : % Are there any bonds to be made bold? + if chem_num2=1 : % Skip the first bold bond. + chem_fill( + (point chem_num2-1 of chem_b_path[$] -- + point chem_num2 of chem_b_path[$] shifted (0,-chem_dbl_offset) -- + point chem_num2 of chem_b_path[$] shifted (0, chem_dbl_offset) -- + cycle) transformed chem_t, + r,c,) ; + fi + if (chem_num2<=chem_num1-1) and (chem_num3>1) : + chem_path0 := subpath (if chem_num2>2 : chem_num2-1 else : 1 fi, + if chem_num3<chem_num1 : chem_num3 else : chem_num1-1 fi) + of chem_b_path[$] ; + chem_fill( + (chem_path0 paralleled -chem_dbl_offset -- + reverse(chem_path0) paralleled -chem_dbl_offset -- + cycle) transformed chem_t, + r,c,) ; + fi + if chem_num3>=chem_num1 : + chem_fill( + (point chem_num1 of chem_b_path[$] -- + point chem_num1-1 of chem_b_path[$] shifted (0,-chem_dbl_offset) -- + point chem_num1-1 of chem_b_path[$] shifted (0, chem_dbl_offset) -- + cycle) transformed chem_t, + r,c,) ; + fi + fi + fi enddef ; -vardef chem_ep (expr n, f, t, r, c) = % one - chem_draw (n, chem_e_path[n], f, t, r, c) ; +vardef chem_rb@# (suffix $) (expr f, t, r, c) = % RB + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair@# of chem_r_fragment($,i) ; + chem_fill( + (point 0 of chem_path0 -- + point 1 of chem_path0 + rotatedaround(point 0 of chem_path0, -chem_bb_angle) -- + point 1 of chem_path0 + rotatedaround(point 0 of chem_path0, chem_bb_angle) -- + cycle) transformed chem_t, + r,c,) ; + endfor +enddef ; + +vardef chem_lrb@# (suffix $) (expr f, t, r, c) = % LRB + if not chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair@# of chem_r_fragment.lft($,i) ; + chem_fill( + (point 0 of chem_path0 -- + point 1 of chem_path0 + rotatedaround(point 0 of chem_path0, -chem_bb_angle) -- + point 1 of chem_path0 + rotatedaround(point 0 of chem_path0, chem_bb_angle) -- + cycle) transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_es (expr n, f, t, r, c) = % one - chem_draw_dot (n, center chem_e_path[n], f, t, r, c) ; +vardef chem_rrb@# (suffix $) (expr f, t, r, c) = % RRB + if not chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair@# of chem_r_fragment.rt($,i) ; + chem_fill( + (point 0 of chem_path0 -- + point 1 of chem_path0 + rotatedaround(point 0 of chem_path0, -chem_bb_angle) -- + point 1 of chem_path0 + rotatedaround(point 0 of chem_path0, chem_bb_angle) -- + cycle) transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_ed (expr n, f, t, r, c) = % one - chem_draw_dot (n, point 0 of chem_e_path[n], f, t, r, c) ; - chem_draw_dot (n, point 1 of chem_e_path[n], f, t, r, c) ; +vardef chem_lsr@# (suffix $) (expr f, t, r, c) = % LSR + if not chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_draw( + (subpath chem_sb_pair@# of chem_r_fragment.lft($,i)) transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_et (expr n, f, t, r, c) = % one - chem_draw_dot (n, point 0 of chem_e_path[n], f, t, r, c) ; - chem_draw_dot (n, center chem_e_path[n], f, t, r, c) ; - chem_draw_dot (n, point 1 of chem_e_path[n], f, t, r, c) ; +vardef chem_rsr@# (suffix $) (expr f, t, r, c) = % RSR + if not chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_draw( + (subpath chem_sb_pair@# of chem_r_fragment.rt($,i)) transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_sd (expr n, f, t, r, c) = % one - chem_draw (n, chem_ddt_path[n], f, t, r, c) ; - chem_draw (n, chem_ddb_path[n], f, t, r, c) ; +vardef chem_lrd@# (suffix $) (expr f, t, r, c) = % LRD + if not chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_draw( + (subpath chem_sb_pair@# of chem_r_fragment.lft($,i)) transformed chem_t, + r,c,dashed evenly) ; + endfor + fi enddef ; -vardef chem_rdd (expr n, f, t, r, c) = % one - chem_draw (n, chem_ldt_path[n], f, t, r, c) ; - chem_draw (n, chem_ldb_path[n], f, t, r, c) ; - chem_draw (n, chem_psb_path[n], f, t, r, c) ; +vardef chem_rrd@# (suffix $) (expr f, t, r, c) = % RRD + if not chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_draw( + (subpath chem_sb_pair@# of chem_r_fragment.rt($,i)) transformed chem_t, + r,c,dashed evenly) ; + endfor + fi enddef ; -vardef chem_ldd (expr n, f, t, r, c) = % one - chem_draw (n, chem_msb_path[n], f, t, r, c) ; - chem_draw (n, chem_rdt_path[n], f, t, r, c) ; - chem_draw (n, chem_rdb_path[n], f, t, r, c) ; +vardef chem_s@# (suffix $) (expr f, t, r, c) = % S + if length(str @#)>0 : + chem_ss@#($,f,t,r,c) ; + else : + chem_ss.b($,f,t,r,c) ; + fi enddef ; -vardef chem_hb (expr n, f, t, r, c) = % one - chem_draw_dot (n, point 0 of chem_sb_path[n], f, t, r, c) ; - chem_draw_dot (n, center chem_sb_path[n], f, t, r, c) ; - chem_draw_dot (n, point 1 of chem_sb_path[n], f, t, r, c) ; +vardef chem_ss@# (suffix $) (expr f, t, r, c) = % SS + if not (chem_star[$] or chem_front[$]) : + chem_draw( + subpath chem_sb_pair@# of (point f-2 of chem_b_path[$] -- point t of chem_b_path[$]) + chem_transformed($), + r,c,) ; + fi enddef ; -vardef chem_bb (expr n, f, t, r, c) = % one - if n < 0 : - chem_fill (n, chem_bb_path[n], 1, 1, r, c) ; - chem_b (n, f, t, r, c) ; +vardef chem_mid@# (suffix $) (expr f, t, r, c) = % MID + if length(str @#)>0 : + chem_mids@#($,f,t,r,c) ; else : - chem_fill (n, chem_bb_path[n], f, t, r, c) ; - fi ; + chem_mids.b($,f,t,r,c) ; + fi enddef ; -vardef chem_oe (expr n, f, t, r, c) = % one - chem_draw (n, chem_oe_path[n], f, t, r, c) ; +vardef chem_mids@# (suffix $) (expr f, t, r, c) = % MIDS + if not (chem_star[$] or chem_front[$]) : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_draw( + (subpath chem_sb_pair@# of (origin -- point i-1 of chem_b_path[$])) + transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_bd (expr n, f, t, r, c) = % one - for i=0 upto 5 : - chem_draw (n, subpath (2i,2i+1) of chem_bd_path[n], f, t, r, c) ; - endfor ; +vardef chem_cd (suffix $) (expr r, c) = % CD + chem_draw( + chem_c_path[$] chem_transformed($), + r,c,dashed evenly) ; enddef ; -vardef chem_bw (expr n, f, t, r, c) = % one - chem_draw (n, chem_bw_path[n], f, t, r, c) ; +vardef chem_c (suffix $) (expr r, c) = % C + chem_draw( + chem_c_path[$] chem_transformed($), + r,c,) ; enddef ; -vardef chem_z_zero@#(text t) = - chem_text@#(t, chem_do(origin)) ; +vardef chem_ccd (suffix $) (expr f, t, r, c) = % CCD + chem_num0 := ypart((origin--center(subpath (f-2,f-1) of chem_b_path[$])) + intersectiontimes chem_c_path[$]) ; + chem_num1 := ypart((origin--center(subpath (t-1,t) of chem_b_path[$])) + intersectiontimes chem_c_path[$]) ; + if chem_num1>chem_num0 : + chem_num0 := chem_num0 + length chem_c_path[$] ; + fi + chem_draw( + subpath (chem_num1,chem_num0) of chem_c_path[$] chem_transformed($), + r,c,dashed evenly) ; +enddef ; + +vardef chem_cc (suffix $) (expr f, t, r, c) = % CC + chem_num0 := ypart((origin--center(subpath (f-2,f-1) of chem_b_path[$])) + intersectiontimes chem_c_path[$]) ; + chem_num1 := ypart((origin--center(subpath (t-1,t) of chem_b_path[$])) + intersectiontimes chem_c_path[$]) ; + if chem_num1>chem_num0 : + chem_num0 := chem_num0 + length chem_c_path[$] ; + fi + chem_draw( + subpath (chem_num1,chem_num0) of chem_c_path[$] chem_transformed($), + r,c,) ; +enddef ; + +vardef chem_ldb@# (suffix $) (expr f, t, r, c) = % LD + if chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair@# of chem_r_fragment($,i) ; + chem_draw( + chem_path0 transformed chem_t, + r,c,) ; + chem_draw( + (chem_path0 paralleled 2chem_dbl_offset) transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_cz_zero@#(text t) = - chem_text@#(t, chem_do(origin)) ; +vardef chem_rdb@# (suffix $) (expr f, t, r, c) = % LD + if chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair@# of chem_r_fragment($,i) ; + chem_draw( + chem_path0 transformed chem_t, + r,c,) ; + chem_draw( + (chem_path0 paralleled -2chem_dbl_offset) transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_z@#(expr n, p) (text t) = - if p = 0 : - chem_text@#(t, chem_do(origin)) ; - else : - chem_text@#(t, chem_do(chem_b_zero[n] rotated chem_ang(n,p))) ; - fi ; +vardef chem_ldd@# (suffix $) (expr f, t, r, c) = % LDD + if chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair@# of chem_r_fragment($,i) ; + chem_draw( + chem_path0 transformed chem_t, + r,c,) ; + chem_draw( + (chem_path0 paralleled 2chem_dbl_offset) transformed chem_t, + r,c,dashed evenly) ; + endfor + fi enddef ; -vardef chem_cz@#(expr n, p) (text t) = - if n = 1 : - chem_c_text(t, chem_do(chem_crz_zero[n] rotated chem_ang(n,p))) ; - else : - chem_text@#(t, chem_do(chem_b_zero[n] rotated chem_ang(n,p))) ; - fi ; +vardef chem_rdd@# (suffix $) (expr f, t, r, c) = % RDD + if chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair@# of chem_r_fragment($,i) ; + chem_draw( + chem_path0 transformed chem_t, + r,c,) ; + chem_draw( + (chem_path0 paralleled -2chem_dbl_offset) transformed chem_t, + r,c,dashed evenly) ; + endfor + fi enddef ; -vardef chem_midz@#(expr n, p) (text t) = - chem_text@#(t, chem_do(chem_mid_zero[n] rotated chem_ang(n,p))) ; +vardef chem_oe@# (suffix $) (expr f, t, r, c) = % OE + if chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair@# of chem_r_fragment($,i) ; + chem_path1 := chem_path0 paralleled -.5chem_dbl_offset ; + chem_path2 := chem_path0 paralleled .5chem_dbl_offset ; + chem_draw( + ( point 0 of chem_path0 -- + .2[point 0 of chem_path0, point infinity of chem_path0].. + .3[point 0 of chem_path1, point infinity of chem_path1].. + .4[point 0 of chem_path0, point infinity of chem_path0].. + .5[point 0 of chem_path2, point infinity of chem_path2].. + .6[point 0 of chem_path0, point infinity of chem_path0].. + .7[point 0 of chem_path1, point infinity of chem_path1].. + .8[point 0 of chem_path0, point infinity of chem_path0]-- + point infinity of chem_path0) transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_rz@#(expr n, p) (text t) = - if n < 0 : - % quite special - chem_text@#(t, chem_do(chem_r_zero[n] shifted (chem_b_zero[n] rotated chem_ang(n,p)))) ; - else : - chem_text@#(t, chem_do(chem_r_zero[n] rotated chem_ang(n,p))) ; - fi ; +vardef chem_bw@# (suffix $) (expr f, t, r, c) = % BW + if chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair@# of chem_r_fragment($,i) ; + chem_path1 := chem_path0 paralleled -.5chem_dbl_offset ; + chem_path2 := chem_path0 paralleled .5chem_dbl_offset ; + chem_draw( + ( point 0 of chem_path0.. + .1[point 0 of chem_path1, point infinity of chem_path1].. + .2[point 0 of chem_path0, point infinity of chem_path0].. + .3[point 0 of chem_path2, point infinity of chem_path2].. + .4[point 0 of chem_path0, point infinity of chem_path0].. + .5[point 0 of chem_path1, point infinity of chem_path1].. + .6[point 0 of chem_path0, point infinity of chem_path0].. + .7[point 0 of chem_path2, point infinity of chem_path2].. + .8[point 0 of chem_path0, point infinity of chem_path0].. + .9[point 0 of chem_path1, point infinity of chem_path1].. + point infinity of chem_path0) transformed chem_t, + r,c,) ; + endfor + fi enddef ; -vardef chem_crz@#(expr n, p) (text tx) = - chem_text(tx, chem_do(chem_crz_zero[n] rotated chem_ang(n,p))) ; +vardef chem_bd@# (suffix $) (expr f, t, r, c) = % BD + if chem_star[$] : chem_rbd#@($,f,t,r,c) ; fi enddef ; -vardef chem_mrz@#(expr n, p) (text t) = - if n < 0 : - % quite special - chem_text@#(t, chem_do(chem_mr_zero[n] shifted (chem_b_zero[n] rotated chem_ang(n,p)))) ; - else : - chem_text@#(t, chem_do(chem_mr_zero[n] rotated chem_ang(n,p))) ; - fi ; +vardef chem_rbd@# (suffix $) (expr f, t, r, c) = % RBD + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair@# of chem_r_fragment($,i) ; + if chem_bd_wedge : + chem_path1 := chem_path0 rotated -chem_bb_angle ; + chem_path2 := chem_path0 rotated chem_bb_angle ; + else : + chem_path1 := chem_path0 paralleled -chem_dbl_offset ; + chem_path2 := chem_path0 paralleled chem_dbl_offset ; + fi + for j=0 upto 3 : + chem_draw( + (point (j/3) of chem_path1 -- point (j/3) of chem_path2) transformed chem_t, + 2r,c,) ; + endfor + endfor +enddef ; + +vardef chem_lrbd@# (suffix $) (expr f, t, r, c) = % LRBD + if not chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair@# of chem_r_fragment.lft($,i) ; + if chem_bd_wedge : + chem_path1 := chem_path0 rotated -chem_bb_angle ; + chem_path2 := chem_path0 rotated chem_bb_angle ; + else : + chem_path1 := chem_path0 paralleled -.5chem_dbl_offset ; + chem_path2 := chem_path0 paralleled .5chem_dbl_offset ; + fi + for j=0 upto 3 : + chem_draw( + (point (j/3) of chem_path1 -- point (j/3) of chem_path2) transformed chem_t, + 2r,c,) ; + endfor + endfor + fi enddef ; -vardef chem_prz@#(expr n, p) (text t) = - if n < 0 : - % quite special - chem_text@#(t, chem_do(chem_pr_zero[n] shifted (chem_b_zero[n] rotated chem_ang(n,p)))) ; - else : - chem_text@#(t, chem_do(chem_pr_zero[n] rotated chem_ang(n,p))) ; - fi ; +vardef chem_rrbd@# (suffix $) (expr f, t, r, c) = % RRBD + if not chem_star[$] : + chem_t := identity chem_transformed($) ; + for i=f upto t : + chem_path0 := subpath chem_sb_pair@# of chem_r_fragment.rt($,i) ; + if chem_bd_wedge : + chem_path1 := chem_path0 rotated -chem_bb_angle ; + chem_path2 := chem_path0 rotated chem_bb_angle ; + else : + chem_path1 := chem_path0 paralleled -.5chem_dbl_offset ; + chem_path2 := chem_path0 paralleled .5chem_dbl_offset ; + fi + for j=0 upto 3 : + chem_draw( + (point (j/3) of chem_path1 -- point (j/3) of chem_path2) transformed chem_t, + 2r,c,) ; + endfor + endfor + fi enddef ; -vardef chem_rt@#(expr n, p) (text t) = - chem_text@#(t, chem_do(chem_rt_zero[n] rotated chem_ang(n,p))) ; +% text, number (no alignment on number); + +vardef chem_z@#(suffix $) (expr p) (text t) = % Z + draw chem_text@# + (t,chem_do( + if p=0 : + origin + else : + (point p-1 of chem_b_path[$]) chem_transformed($) + fi + )) ; enddef ; -vardef chem_rtt@#(expr n, p) (text t) = - chem_text@#(t, chem_do(chem_rtt_zero[n] rotated chem_ang(n,p))) ; +vardef chem_cz@#(suffix $) (expr p) (text t) = chem_z@#($,p,t) ; enddef ; % CZ ? + +vardef chem_midz@#(suffix $) (expr p) (text t) = % MIDZ + if not (chem_star[$] or chem_front[$]) : + draw chem_text@# + (t,chem_do( + (xpart chem_sb_pair, 0) scaled (xpart point 0 of chem_b_path[$]) + chem_transformed($) + )) ; + fi enddef ; -vardef chem_rbt@#(expr n, p) (text t) = - chem_text@#(t, chem_do(chem_rbt_zero[n] rotated chem_ang(n,p))) ; +vardef chem_rz@#(suffix $) (expr p) (text t) = % RZ + draw chem_text@# + (t, chem_do((point p-1 of chem_r_path[$]) chem_transformed($))) ; enddef ; -vardef chem_zt@#(expr n, p) (text t) = - if n = 1 : - chem_text@#(t, chem_do(chem_rt_zero[n] rotated chem_ang(n,p))) ; - else : - chem_text@#(t, chem_do(chem_n_zero[n] rotated chem_ang(n,p))) ; - fi ; +vardef chem_lrz@#(suffix $) (expr p) (text t) = % LRZ + if not chem_star[$] : + draw chem_text@# + (t, + chem_do((point p-1 of chem_r_path.lft[$]) chem_transformed($))) ; + fi enddef ; -vardef chem_zn@#(expr n, p) (text t) = - if n = 1 : - chem_text@#(t, chem_do(chem_rt_zero[n] rotated chem_ang(n,p))) ; - else : - chem_text@#(t, chem_do(chem_n_zero[n] rotated chem_ang(n,p))) ; - fi ; +vardef chem_rrz@#(suffix $) (expr p) (text t) = % RRZ + if not chem_star[$] : + draw chem_text@# + (t, chem_do((point p-1 of chem_r_path.rt[$]) chem_transformed($))) ; + fi enddef ; -vardef chem_zbt@#(expr n, p) (text t) = - chem_text@#(t, chem_do(chem_rtt_zero[n] rotated chem_ang(n,p))) ; +vardef chem_zn@#(suffix $) (expr p) (text t) = % ZN + chem_zt($,p,t) ; enddef ; -vardef chem_zbn@#(expr n, p) (text t) = - chem_text@#(t, chem_do(chem_rtt_zero[n] rotated chem_ang(n,p))) ; +vardef chem_zt@#(suffix $) (expr p) (text t) = % ZT + draw chem_text@#(t,chem_do ((point p-1 of chem_b_path[$]) chem_transformed($) + scaled chem_text_min)) ; enddef ; -vardef chem_ztt@#(expr n, p) (text t) = - chem_text@#(t, chem_do(chem_rbt_zero[n] rotated chem_ang(n,p))) ; +vardef chem_zln@#(suffix $) (expr p) (text t) = % ZLN + chem_zlt($,p,t) ; enddef ; -vardef chem_ztn@#(expr n, p) (text t) = - chem_text@#(t, chem_do(chem_rbt_zero[n] rotated chem_ang(n,p))) ; +vardef chem_zlt@#(suffix $) (expr p) (text t) = % ZLT + draw chem_text@#(t, chem_do((point p-1.5 of chem_b_path[$]) chem_transformed($) + scaled chem_text_min)) ; enddef ; -vardef chem_symbol(expr t) = - draw textext(t) ; +vardef chem_zrn@#(suffix $) (expr p) (text t) = % ZRN + chem_zrt($,p,t) ; enddef ; -vardef chem_text@#(expr txt, z) = % adapted copy of thelabel@ - save p ; picture p ; - p := textext(txt) ; - p := p - if (mfun_labtype@# >= 10) : shifted (0,ypart center p) fi - shifted (z + chem_text_offset*mfun_laboff@# - (mfun_labxf@#*lrcorner p + mfun_labyf@#*ulcorner p + (1-mfun_labxf@#-mfun_labyf@#)*llcorner p)) ; - if chem_text_trace : - draw z withpen pencircle scaled 2pt withcolor red ; - draw boundingbox p withpen pencircle scaled 1pt withcolor red ; - fi ; - draw p +vardef chem_zrt@#(suffix $) (expr p) (text t) = % ZRT + draw chem_text@#(t, chem_do((point p-0.5 of chem_b_path[$]) chem_transformed($) + scaled chem_text_min)) ; enddef ; -vardef chem_c_text(expr txt, z) = % adapted copy of thelabel@ - save p ; picture p ; p := textext(txt) ; - save b ; path b ; b := (boundingbox p) shifted z ; - save a ; pair a ; a := (origin--z) intersection_point b ; - if intersection_found : - draw p shifted (z enlonged arclength(a -- center b)) ; - else : - draw p shifted z ; +vardef chem_crz@#(suffix $) (expr p) (text t) = % CRZ ???? + if chem_star[$] : + draw chem_text@#(t, chem_do((point p-1 of chem_b_path[$] enlonged chem_center_offset) + chem_transformed($))) ; fi -% draw b withcolor green ; -% draw a withcolor red ; enddef ; -vardef chem_ang (expr n, d) = - ((-1 * (d-1) * chem_angle[n]) + (-chem_rotation+1) * 90 + chem_start[n]) % no ; +vardef chem_rn@#(suffix $) (expr i, t) = % RN + chem_rt($,i,t) ; enddef ; -vardef chem_rot (expr n, d) = - chem_rotation := d ; +vardef chem_rt@#(suffix $) (expr p) (text t) = % RT + draw chem_text@#(t, chem_do((center chem_r_fragment($,p)) chem_transformed($))) ; enddef ; -vardef chem_adj (expr n, d) = - chem_adjacent := d ; +vardef chem_lrn@#(suffix $) (expr i, t) = % LRN + chem_lrt($,i,t) ; enddef ; -vardef chem_sub (expr n, d) = - chem_substituent := d ; +vardef chem_lrt@#(suffix $) (expr p) (text t) = % LRT + draw chem_text@#(t, chem_do((center chem_r_fragment.lft($,p)) chem_transformed($))) ; enddef ; -vardef chem_dir (expr n, d) = - if n = 1 : - chem_direction_p := (origin - 2*center(chem_b_path[n] rotated chem_ang(n,d+1))) ; - currentpicture := currentpicture shifted chem_direction_p ; - chem_shift := chem_shift + chem_direction_p ; - fi ; +vardef chem_rrn@# (suffix $) (expr i, t) = % RRN + chem_rrt($,i,t) ; enddef ; -vardef chem_mov (expr n, d) = - if d = 0 : - currentpicture := currentpicture shifted - chem_shift ; - chem_shift := origin ; - else : - chem_move_p := (origin - 2*center(chem_b_path[n] rotated chem_ang(n,d+chem_initialmov[n]))) ; - currentpicture := currentpicture shifted chem_move_p ; - chem_shift := chem_shift + chem_move_p ; - fi ; +vardef chem_rrt@#(suffix $) (expr p) (text t) = % RRT + draw chem_text@#(t, chem_do((center chem_r_fragment.rt($,p)) chem_transformed($))) ; enddef ; -vardef chem_off (expr n, d) = - if (d = 1) or (d = 2) or (d = 8) : % positive - currentpicture := currentpicture shifted (-chem_setting_offset,0) ; - chem_shift := chem_shift + (-chem_setting_offset,0) - elseif (d = 4) or (d = 5) or (d = 6) : % negative - currentpicture := currentpicture shifted ( chem_setting_offset,0) ; - chem_shift := chem_shift + ( chem_setting_offset,0) - fi ; +vardef chem_symbol(expr t) = draw textext(t) ; enddef ; + +vardef chem_align@#(expr pic) = + pic + if (mfun_labtype@# >= 10) : + shifted (0,ypart center pic) + fi + shifted (-(mfun_labxf@#*lrcorner pic + mfun_labyf@#*ulcorner pic + (1-mfun_labxf@#-mfun_labyf@#)*llcorner pic)) enddef ; -vardef chem_set(expr n, m) = - if chem_adjacent > 0 : - chem_adjacent_d := xpart chem_b_zero[n] + xpart chem_b_zero[m] ; - if chem_adjacent = 1 : chem_adjacent_p := (-chem_adjacent_d, 0) ; - elseif chem_adjacent = 2 : chem_adjacent_p := (0, -chem_adjacent_d) ; - elseif chem_adjacent = 3 : chem_adjacent_p := ( chem_adjacent_d, 0) ; - elseif chem_adjacent = 4 : chem_adjacent_p := (0, chem_adjacent_d) ; - else : chem_adjacent_p := origin ; - fi ; - currentpicture := currentpicture shifted chem_adjacent_p ; - chem_shift := chem_shift + chem_adjacent_p ; - chem_adjacent := 0 ; - fi ; - if chem_substituent > 0 : - if m = 1 : - chem_substituent_d := xpart chem_crz_zero[n] + chem_substituent_offset ; +vardef chem_text@#(expr txt, z) = + chem_pic := textext(txt) ; + if length(str @#)=0 : + chem_pic := chem_align(chem_pic) ; + elseif (str @#) = "auto" : + if z<>origin : + chem_num0 := abs(angle(z rotated chem_setting_rotation)) ; + if chem_num0<=60 : + chem_pic := chem_align.rt (chem_pic) xshifted chem_text_offset ; + elseif chem_num0>=120 : + chem_pic := chem_align.lft(chem_pic) xshifted -chem_text_offset ; + else : + chem_pic := chem_align (chem_pic) ; + fi + else : + chem_pic := chem_align (chem_pic) ; + fi else : - chem_substituent_d := xpart chem_crz_zero[n] + xpart chem_b_zero[m] ; - fi ; - if chem_substituent = 1 : chem_substituent_p := (-chem_substituent_d, 0) ; % - ? - elseif chem_substituent = 2 : chem_substituent_p := (0, chem_substituent_d) ; - elseif chem_substituent = 3 : chem_substituent_p := ( chem_substituent_d, 0) ; - elseif chem_substituent = 4 : chem_substituent_p := (0, -chem_substituent_d) ; - else : chem_substituent_p := origin ; - fi ; - currentpicture := currentpicture shifted chem_substituent_p ; - chem_shift := chem_shift + chem_substituent_p ; - chem_substituent := 0 ; - fi ; - chem_rotation := chem_initialrot[m] ; + chem_pic := chem_align@#(chem_pic) shifted (chem_text_offset*mfun_laboff@#) ; + fi + chem_pic := (chem_pic rotated -chem_setting_rotation) shifted z ; + + if chem_trace_text : + draw z withpen pencircle scaled 2pt withcolor red ; + draw boundingbox chem_pic withpen pencircle scaled 1pt withcolor red ; + fi + + chem_pic enddef ; -vardef chem_draw (expr n, path_fragment, from_point, to_point, linewidth, linecolor) = - for i:=from_point upto to_point: - draw (path_fragment rotated chem_ang(n,i)) withpen pencircle scaled linewidth withcolor linecolor ; - endfor ; +% transform + +% rotations and reflections + +vardef chem_rot (suffix $) (expr d, s) = % ROT + if not chem_front[$] : + if d=0 : + chem_rotation := 0 + else : + chem_num0 := if chem_stacked[$] : 3 else : 0 fi ; + chem_num1 := .5(angle(point d+chem_num0 of chem_b_path[$]) - + angle(point d+chem_num0-1 of chem_b_path[$])) ; + chem_rotation := (chem_rotation + s*chem_num1) mod 360 ; + fi + fi enddef ; -vardef chem_fill (expr n, path_fragment, from_point, to_point, linewidth, linecolor) = - for i:=from_point upto to_point: - fill (path_fragment rotated chem_ang(n,i)) withpen pencircle scaled 0 withcolor linecolor ; - endfor ; +vardef chem_mir (suffix $) (expr d, s) = % MIR + % We take the scale factor s to multiply the rotation, but only ONCE. + % For example: CARBON,.5MIR12 will give a rotation by 104° + if not chem_front[$] : + if d=0 : % inversion + if chem_mirror=origin : + chem_rotation := (chem_rotation + 180*s) mod 360 ; + else : + chem_mirror := chem_mirror rotated 90 ; + fi + else : + chem_pair0 := (point d-1 of chem_b_path[$]) scaled s ; % not chem_transformed + if chem_mirror=origin : + chem_mirror := chem_pair0 ; + else : + chem_num0 := angle(chem_mirror)-angle(chem_pair0) ; + if (chem_num0>0) and (chem_num0> 180) : + chem_num0 := 360 - chem_num0 ; + elseif (chem_num0<0) and (chem_num0<-180) : + chem_num0 := -360 - chem_num0 ; + fi + chem_num0 := chem_num0 * s ; + chem_rotation := (chem_rotation + 2chem_num0) mod 360 ; + chem_mirror := origin ; + fi + fi + fi enddef ; -vardef chem_dashed_normal (expr n, path_fragment, from_point, to_point, linewidth, linecolor) = - for i:=from_point upto to_point: - draw (path_fragment rotated chem_ang(n,i)) withpen pencircle scaled linewidth withcolor linecolor dashed evenly ; - endfor ; +% translations + +vardef chem_dir (suffix $) (expr d, s) = % DIR (same as MOV(d-1)MOV(d+1)) + if not chem_front[$] : + if d=0 : + currentpicture := currentpicture shifted -chem_origin ; + chem_origin := origin ; + else : + chem_pair0 := + (((point d-2 of chem_b_path[$]) shifted (point d of chem_b_path[$])) scaled s) + chem_transformed($) ; + currentpicture := currentpicture shifted -chem_pair0 ; + chem_origin := chem_origin shifted -chem_pair0 ; + fi + fi +enddef ; + +vardef chem_mov (suffix $) (expr d, s) = % MOV + if d=0 : + currentpicture := currentpicture shifted -chem_origin ; + chem_origin := origin ; + else : + chem_pair0 := ((point d-1 of chem_b_path[$]) scaled s) chem_transformed($) ; + currentpicture := currentpicture shifted -chem_pair0 ; + chem_origin := chem_origin shifted -chem_pair0 ; + fi ; enddef ; -vardef chem_dashed_connected (expr n, path_fragment, from_point, to_point, linewidth, linecolor) = - draw for i:=from_point upto to_point: - (path_fragment rotated chem_ang(n,i)) if i < to_point : -- fi - endfor withpen pencircle scaled linewidth withcolor linecolor dashed evenly ; +vardef chem_mark (suffix $) (expr d, s) = % MARK + % scale s is ignored + if d<>0 : + chem_mark_pair[d] := -chem_origin ; + fi enddef ; -vardef chem_draw_dot (expr n, path_fragment, from_point, to_point, linewidth, linecolor) = - for i:=from_point upto to_point: - draw (path_fragment rotated chem_ang(n,i)) withpen pencircle scaled (chem_dot_factor*linewidth) withcolor linecolor ; - endfor ; +vardef chem_marked (expr d) = + if d=0 : + chem_origin + elseif known chem_mark_pair[d] : + chem_mark_pair[d] shifted chem_origin + else : + origin + fi enddef ; -vardef chem_draw_fixed (expr n, path_fragment, linewidth, linecolor) = - draw (path_fragment rotated chem_ang(n,1)) withpen pencircle scaled linewidth withcolor linecolor ; +vardef chem_number@#(suffix $) (expr p) (text t) = chem_label@#($,p,t) enddef ; % NUMBER +vardef chem_label@# (suffix $) (expr p) (text t) = % LABEL + draw chem_text@#(t,chem_do(chem_marked(p))) ; enddef ; -vardef chem_draw_arrow (expr n, path_fragment, from_point, to_point, linewidth, linecolor) = - for i:=from_point upto to_point: - drawarrow (path_fragment rotated chem_ang(n,i)) withpen pencircle scaled linewidth withcolor linecolor ; - endfor ; +vardef chem_move (suffix $) (expr d, s) = % MOVE + chem_pair0 := chem_marked(d) scaled s ; + currentpicture := currentpicture shifted -chem_pair0 ; + chem_origin := chem_origin shifted -chem_pair0 ; enddef ; -vardef chem_draw_vertical (expr n, path_fragment, from_point, to_point, linewidth, linecolor) = - % quite special - for i:=from_point upto to_point: - draw (path_fragment shifted (chem_b_zero[n] rotated chem_ang(n,i))) withpen pencircle scaled linewidth withcolor linecolor ; - endfor ; +vardef chem_diff (suffix $) (expr d, s) = % DIFF + chem_pair0 := (chem_marked(d) shifted -chem_origin) scaled s ; + currentpicture := currentpicture shifted -chem_pair0 ; + chem_origin := chem_origin shifted -chem_pair0 ; enddef ; -picture chem_stack_p[] ; -pair chem_stack_shift[] ; - -vardef chem_save = - chem_stack_n := chem_stack_n + 1 ; - chem_stack_p[chem_stack_n] := currentpicture ; - chem_stack_shift[chem_stack_n] := chem_shift ; - chem_shift := origin ; -% chem_adjacent := 0 ; -% chem_substituent := 0 ; -% chem_rotation := 1 ; - currentpicture := nullpicture ; +vardef chem_line (suffix $) (expr f, t, r, c) = % LINE + draw if f=t : origin else : chem_marked(f) fi -- chem_marked(t) + % no chem_transformed + withpen pencircle scaled r + withcolor c %\MPcolor{c} enddef ; -vardef chem_restore = - if chem_stack_n > 0 : - currentpicture := currentpicture shifted - chem_shift ; - addto chem_stack_p[chem_stack_n] also currentpicture ; - currentpicture := chem_stack_p[chem_stack_n] ; - chem_stack_p[chem_stack_n] := nullpicture ; - chem_shift := chem_stack_shift[chem_stack_n] ; - chem_stack_n := chem_stack_n - 1 ; - fi ; +vardef chem_dash (suffix $) (expr f, t, r, c) = % DASH + draw if f=t : origin else : chem_marked(f) fi -- chem_marked(t) + % no chem_transformed + withpen pencircle scaled r + withcolor c %\MPcolor{c} + dashed evenly ; enddef ; -def chem_init_some(expr n, ratio, start, initialrot, initialmov) = - chem_width [n] := ratio * chem_base_width * chem_setting_scale ; - chem_angle [n] := 360/abs(n) ; - chem_start [n] := start ; - chem_initialrot[n] := initialrot ; - chem_initialmov[n] := initialmov ; - chem_b_zero [n] := (chem_width[n],0) rotated (chem_angle[n]/2) ; - chem_n_zero [n] := (chem_text_min*chem_width[n],0) rotated (chem_angle[n]/2) ; - chem_r_max [n] := chem_radical_max*chem_b_zero[n] ; - chem_r_path [n] := chem_b_zero[n] -- chem_r_max[n] ; - chem_mr_path [n] := chem_r_path [n] rotatedaround(chem_b_zero[n], (180-chem_angle[n])/2) ; - chem_pr_path [n] := chem_r_path [n] rotatedaround(chem_b_zero[n],-(180-chem_angle[n])/2) ; - chem_r_zero [n] := point 1 of chem_r_path [n] ; - chem_mr_zero [n] := point 1 of chem_mr_path[n] ; - chem_pr_zero [n] := point 1 of chem_pr_path[n] ; - chem_crz_zero [n] := point 1 of (chem_r_path[n] enlonged chem_center_offset) ; - chem_au_path [n] := subpath (0.2,0.8) of (chem_r_max[n] -- (chem_r_max[n] rotated chem_angle[n])) ; - chem_ad_path [n] := reverse(chem_au_path[n]) ; - chem_rt_zero [n] := (((chem_radical_max+chem_radical_min)/2)*chem_width[n],0) rotated (chem_angle[n]/2) ; - chem_rtt_zero [n] := chem_rt_zero[n] rotated + 10 ; - chem_rbt_zero [n] := chem_rt_zero[n] rotated - 10 ; - chem_b_path [n] := reverse(chem_b_zero[n] -- (chem_b_zero[n] rotated -chem_angle[n])) ; - chem_bx_path [n] := reverse(chem_b_zero[n] -- (chem_b_zero[n] rotated -chem_angle[n])) ; % ? - chem_sb_path [n] := subpath (0.25,0.75) of chem_b_path[n] ; - chem_s_path [n] := point 0 of chem_b_path[n] -- point 0 of (chem_b_path[n] rotated (2chem_angle[n])) ; - chem_ss_path [n] := subpath (0.25,0.75) of (chem_s_path[n]) ; - chem_pss_path [n] := subpath (0.00,0.75) of (chem_s_path[n]) ; - chem_mss_path [n] := subpath (0.25,1.00) of (chem_s_path[n]) ; - chem_mid_zero [n] := origin shifted (-.25chem_width[n],0) ; - chem_midst_path[n] := chem_mid_zero[n] -- (chem_width[n],0) rotated ( chem_angle[n] + chem_angle[n]/2) ; - chem_midsb_path[n] := chem_mid_zero[n] -- (chem_width[n],0) rotated (-chem_angle[n] - chem_angle[n]/2) ; - chem_midt_path [n] := subpath (0.25,1.00) of chem_midst_path [n] ; - chem_midb_path [n] := subpath (0.25,1.00) of chem_midsb_path [n] ; - chem_msb_path [n] := subpath (0.00,0.75) of chem_b_path[n] ; - chem_psb_path [n] := subpath (0.25,1.00) of chem_b_path[n] ; - chem_dbl_path [n] := chem_sb_path[n] shifted - (0.05[origin,center chem_sb_path[n]]) ; % parallel - chem_dbr_path [n] := chem_sb_path[n] shifted + (0.05[origin,center chem_sb_path[n]]) ; - chem_eb_path [n] := chem_sb_path[n] shifted - (0.25[origin,center chem_sb_path[n]]) ; - chem_sr_path [n] := chem_radical_min*chem_b_zero[n] -- chem_r_max[n] ; - chem_rl_path [n] := chem_r_path[n] paralleled (chem_base_width/20) ; - chem_rr_path [n] := chem_r_path[n] paralleled -(chem_base_width/20) ; - chem_srl_path [n] := chem_sr_path[n] paralleled (chem_base_width/20) ; - chem_srr_path [n] := chem_sr_path[n] paralleled -(chem_base_width/20) ; - chem_br_path [n] := point 1 of chem_sb_path[n] -- - point 0 of chem_sb_path[n] rotatedaround(point 1 of chem_sb_path[n], -4) -- - point 0 of chem_sb_path[n] rotatedaround(point 1 of chem_sb_path[n], 4) -- cycle ; - chem_rb_path [n] := chem_b_zero[n] -- chem_r_max[n] rotated -2 -- chem_r_max[n] -- chem_r_max[n] rotated 2 -- cycle ; - chem_mrb_path [n] := chem_rb_path[n] rotatedaround(chem_b_zero[n], (180-chem_angle[n])/2) ; - chem_prb_path [n] := chem_rb_path[n] rotatedaround(chem_b_zero[n],-(180-chem_angle[n])/2) ; - chem_msr_path [n] := chem_sr_path[n] rotatedaround(chem_b_zero[n], (180-chem_angle[n])/2) ; - chem_psr_path [n] := chem_sr_path[n] rotatedaround(chem_b_zero[n],-(180-chem_angle[n])/2) ; - % not yet ok: -% chem_c_path [n] := subpath (30/45, -30/45) of (fullcircle scaled (1.25*chem_circle_radius*chem_width[n])); -% chem_cc_path [n] := subpath (30/45,8-30/45) of (fullcircle rotated 90 scaled (1.25*chem_circle_radius*chem_width[n])); - chem_c_path [n] := subpath (30/45, -30/45) of (fullcircle scaled (chem_width[n])); - chem_cc_path [n] := subpath (30/45,8-30/45) of (fullcircle rotated 90 scaled (chem_width[n])); -enddef ; - -def chem_init_three = chem_init_some(3,30/52 ,-60,1,2) ; enddef ; % 60 -def chem_init_four = chem_init_some(4,30/42.5, 0,1,0) ; enddef ; % 45 -def chem_init_five = chem_init_some(5,30/35 , 0,1,0) ; enddef ; % 36 -def chem_init_six = chem_init_some(6, 1 , 0,1,0) ; enddef ; % 30 -def chem_init_eight = chem_init_some(8,30/22.5, 0,1,0) ; enddef ; % 22.5 - -% bb R -R R Z -RZ +RZ - -def chem_init_some_front(expr n, ratio, start, initialrot, initialmov) = - chem_init_some(n, ratio, start, initialrot, initialmov) ; - chem_bb_path [n] := chem_b_path[n] rotated -chem_angle[n] -- chem_b_path[n] -- chem_b_path[n] rotated chem_angle[n] -- - (reverse(chem_b_path[n] shortened (chem_base_width/20))) paralleled (chem_base_width/20) -- - cycle ; - chem_r_max [n] := chem_radical_max*chem_b_zero[n] ; - chem_mr_path [n] := origin -- origin shifted (0,-.25chem_base_width) ; - chem_pr_path [n] := origin -- origin shifted (0, .25*chem_base_width) ; - chem_r_path [n] := point 1 of chem_mr_path[n] -- point 1 of chem_pr_path[n] ; - chem_mr_zero [n] := point 1 of chem_mr_path[n] ; - chem_pr_zero [n] := point 1 of chem_pr_path[n] ; -enddef ; - -def chem_init_five_front = chem_init_some_front(-5,30/35,0,2,0) ; enddef ; % 36 -def chem_init_six_front = chem_init_some_front(-6, 1 ,0,2,0) ; enddef ; % 30 - -vardef chem_init_one = - chem_width [1] := .75 * chem_base_width * chem_setting_scale ; - chem_angle [1] := 360/8 ; - chem_start [1] := 0 ; - chem_initialrot[1] := 1 ; - chem_initialmov[1] := 1 ; - chem_b_zero [1] := (1.75*chem_width[1],0) ; - chem_r_min [1] := chem_radical_min*chem_b_zero[1] ; - chem_r_max [1] := chem_radical_max*chem_b_zero[1] ; - chem_r_path [1] := (.5*chem_width[1],0) -- (1.25*chem_width[1],0) ; - chem_r_zero [1] := point 1 of chem_r_path [1] ; - chem_b_path [1] := chem_r_path[1] rotated + (chem_angle[1]) ; % used for move here - chem_b_zero [1] := chem_r_zero[1] ; - chem_crz_zero [1] := chem_r_zero[1] enlonged chem_center_offset ; - chem_e_path [1] := (.5*chem_width[1],-.25*chem_width[1]) -- (.5*chem_width[1],.25*chem_width[1]) ; - chem_sb_path [1] := chem_r_path [1] ; - chem_msb_path [1] := chem_r_path [1] shifted (0,-.1chem_width[1]) ; - chem_psb_path [1] := chem_r_path [1] shifted (0, .1chem_width[1]) ; - chem_ddt_path [1] := subpath(0,.4) of chem_r_path [1] ; - chem_ddb_path [1] := subpath(.6,1) of chem_r_path [1] ; - chem_ldt_path [1] := chem_ddt_path [1] shifted (0,-.1chem_width[1]) ; % parallel - chem_ldb_path [1] := chem_ddb_path [1] shifted (0,-.1chem_width[1]) ; - chem_rdt_path [1] := chem_ddt_path [1] shifted (0, .1chem_width[1]) ; - chem_rdb_path [1] := chem_ddb_path [1] shifted (0, .1chem_width[1]) ; - save pr ; pair pr[] ; - pr0 := point 0 of chem_r_path[1] ; - pr1 := point 1 of chem_r_path[1] ; - chem_bb_path [1] := pr0 -- (pr1 rotatedaround(pr0,-chem_bb_angle)) -- (pr1 rotatedaround(pr0,chem_bb_angle)) -- cycle ; - chem_oe_path [1] := ((-20,0)--(10,0){up}..(20,10)..(30,0)..(40,-10)..(50.0,0)..(60,10)..(70,0)..(80,-10)..{up}(90,0)--(120,0)) - xsized (.75*chem_width[1]) shifted pr0 ; - chem_rt_zero [1] := point .5 of chem_r_path[1] ; - chem_rtt_zero [1] := chem_rt_zero[1] rotated + (chem_angle[1]/2) ; - chem_rbt_zero [1] := chem_rt_zero[1] rotated - (chem_angle[1]/2) ; - % added by Alan Braslau (adapted to use shared variables): - save p ; pair p[] ; - p0 := pr1 rotatedaround(pr0, -chem_bd_angle) ; - p1 := pr1 rotatedaround(pr0, +chem_bd_angle) ; - p2 := p0 shifted - pr1 ; - p3 := p1 shifted - pr1 ; - chem_bd_path [1] := - p0 -- p1 for i=chem_bd_n downto 0 : - -- p2 shifted (i/chem_bd_n)[pr1,pr0] - -- p3 shifted (i/chem_bd_n)[pr1,pr0] - endfor ; - chem_bw_path [1] := - for i=0 upto chem_bw_n - 1 : - ((i) /chem_bw_n)[pr0,pr1] .. ((i+.25)/chem_bw_n)[pr0,pr1] shifted p2 .. - ((i+.50)/chem_bw_n)[pr0,pr1] .. ((i+.75)/chem_bw_n)[pr0,pr1] shifted -p2 .. - endfor pr1 ; +vardef chem_arrow (suffix $) (expr f, t, r, c) = % ARROW + drawarrow if f=t : origin else : chem_marked(f) fi -- chem_marked(t) + % no chem_transformed + withpen pencircle scaled r + withcolor c %\MPcolor{c} enddef ; -def chem_init_all = - chem_init_one ; - chem_init_three ; - chem_init_four ; - chem_init_five ; - chem_init_six ; - chem_init_eight ; - chem_init_five_front ; - chem_init_six_front ; + +vardef chem_rm (suffix $) (expr d, s) = % RM + if (not chem_front[$]) and (d<>0) : + chem_pair0 := ((point d-1 of chem_r_path[$]) scaled s) chem_transformed($) ; + currentpicture := currentpicture shifted -chem_pair0 ; + chem_origin := chem_origin shifted -chem_pair0 ; + fi ; enddef ; -chem_init_all ; +vardef chem_off (suffix $) (expr d, s) = % OFF + if d=0 : + currentpicture := currentpicture shifted -chem_origin ; + chem_origin := origin ; + else : + chem_pair0 := (unitvector(point d-1 of chem_b_path[one])) scaled chem_setting_offset*s ; + % not chem_transformed + currentpicture := currentpicture shifted -chem_pair0 ; + chem_origin := chem_origin shifted -chem_pair0 ; + fi ; +enddef ; |