summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/metapost/context/base/mp-grid.mp
blob: f6e84348915c975385e1de3fcd6dd8e4f41d2090 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
%D \module
%D   [       file=mp-grid.mp,
%D        version=2000.07.10,
%D          title=\CONTEXT\ \METAPOST\ graphics,
%D       subtitle=grid support,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%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 Under construction.

if unknown context_tool :    input mp-tool ; fi ;
if   known context_grid : endinput         ; fi ;

boolean context_grid ; context_grid := true ;

string  fmt_separator  ; fmt_separator  := "@" ;
numeric fmt_precision  ; fmt_precision  := 3 ;
boolean fmt_initialize ; fmt_initialize := false ;
boolean fmt_zerocheck  ; fmt_zerocheck  := true ;

if unknown fmt_loaded : input mp-form ; fi ;

boolean fmt_pictures ; fmt_pictures := true ;

def  do_format = if fmt_pictures :  format else :  formatstr fi enddef ;
def do_mformat = if fmt_pictures : Mformat else : Mformatstr fi enddef ;

numeric grid_eps ; grid_eps = eps ;

def hlingrid (expr Min, Max, Step, Length, Width) text t =
  image ( for i=Min step Step until Max+grid_eps :
    draw (origin--(Width,0)) shifted (0,i*(Length/Max)) t ;
  endfor ; ) ;
enddef ;

def vlingrid (expr Min, Max, Step, Length, Height) text t =
  image ( for i=Min step Step until Max+grid_eps :
    draw (origin--(0,Height)) shifted (i*(Length/Max),0) t ;
  endfor ; ) ;
enddef ;

def hloggrid (expr Min, Max, Step, Length, Width) text t =
  image ( for i=max(Min,1) step Step until min(Max,10)+grid_eps :
    draw (origin--(Width,0)) shifted (0,Length*log(i)) t ;
  endfor ; ) ;
enddef ;

def vloggrid (expr Min, Max, Step, Length, Height) text t =
  image ( for i=max(Min,1) step Step until min(Max,10)+grid_eps :
    draw (origin--(0,Height)) shifted (Length*log(i),0) t ;
  endfor ; ) ;
enddef ;

vardef hlintext@#(expr Min, Max, Step, Length, Format) text t =
  image ( do_initialize_numbers ;
  for i=Min step Step until Max+grid_eps :
    draw textext@#(do_format(Format,i)) shifted (0,i*(Length/Max)) t ;
  endfor ; )
enddef ;

vardef vlintext@#(expr Min, Max, Step, Length, Format) text t =
  image ( do_initialize_numbers ;
  for i=Min step Step until Max+grid_eps :
    draw textext@#(do_format(Format,i)) shifted (i*(Length/Max),0) t ;
  endfor ; )
enddef ;

vardef hlogtext@#(expr Min, Max, Step, Length, Format) text t =
  image ( do_initialize_numbers ;
  for i=max(Min,1) step Step until min(Max,10)+grid_eps :
    draw textext@#(do_format(Format,i)) shifted (0,Length*log(i)) t ;
  endfor ; )
enddef ;

vardef vlogtext@#(expr Min, Max, Step, Length, Format) text t =
  image ( do_initialize_numbers ;
  for i=max(Min,1) step Step until min(Max,10)+grid_eps :
    draw textext@#(do_format(Format,i)) shifted (Length*log(i),0) t ;
  endfor ; )
enddef ;

vardef hlinlabel@#(expr Min, Max, Step, Length) text t =
  image (
  for i=Min step Step until Max+grid_eps :
    draw thelabel@#(decimal i,(0,i*(Length/Max))) t ;
  endfor ; )
enddef ;

vardef vlinlabel@#(expr Min, Max, Step, Length) text t =
  image (
  for i=Min step Step until Max+grid_eps :
    draw thelabel@#(decimal i,(i*(Length/Max),0)) t ;
  endfor ; )
enddef ;

boolean numbers_initialized ; numbers_initialized := false ;

def do_initialize_numbers =
  if not numbers_initialized :
    init_numbers ( textext.raw("$-$")          ,
                   textext.raw("$1$")          ,
                   textext.raw("${\times}10$") ,
                   textext.raw("${}^-$")       ,
                   textext.raw("${}^2$")       ) ;
    numbers_initialized := true ;
  fi ;
enddef ;

def initialize_numbers =
  numbers_initialized := false ; do_initialize_numbers ;
enddef ;

vardef linlog(expr xy) = (    xpart xy,  log(ypart xy)) enddef ;
vardef loglin(expr xy) = (log(xpart xy),     ypart xy)  enddef ;
vardef loglog(expr xy) = (log(xpart xy), log(ypart xy)) enddef ;
vardef linlin(expr xy) = (   (xpart xy),    (ypart xy)) enddef ;

vardef loglinpath primary p = processpath (p) (loglin) enddef ;
vardef linlogpath primary p = processpath (p) (linlog) enddef ;
vardef loglogpath primary p = processpath (p) (loglog) enddef ;
vardef linlinpath primary p = processpath (p) (linlin) enddef ;

def processpath (expr p) (text pp) =
  if path p :
    for i=0 upto length(p)-1 :
      (pp(point       i    of p)) .. controls
      (pp(postcontrol i    of p)) and
      (pp(precontrol (i+1) of p)) ..
    endfor
    if cycle p :
      cycle
    else :
      (pp(point length(p) of p))
    fi
  elseif pair p :
    (pp(p))
  else :
    p
  fi
enddef ;