summaryrefslogtreecommitdiff
path: root/graphics/metaplot/metaplot.mp
blob: 831843e14e8a73c0cd5c34cd0615affa8834856c (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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
% METAPLOT: primary plot routines for the METAPLOT package.
% Copyright(C) 2004-2005, Brooks Moses
% 
%   This work may be distributed and/or modified under the
%   conditions of the LaTeX Project Public License, either
%   version 1.3 of this license or (at your option) any
%   later version.
%   The latest version of the license is in
%      http://www.latex-project.org/lppl.txt
%   and version 1.3 or later is part of all distributions of
%   LaTeX version 2003/06/01 or later.
% 
%   This work has the LPPL maintenance status "author-maintained".
%
% Version 0.91.
%
% The n < 1.0 release number indicates that this is a beta release;
% the author at present makes no assurances that the command syntax
% will remain unchanged between this and the final Version 1.0
% release.
%
% Bug reports, feature requests, and all other suggestions should
% be directed to Brooks Moses via metaplot@dpdx.net.


% Load MetaPlot axes macros
input axes

% plot_instantiate(suffix inst, suffix plot_object)
%
% Defines a page-instance of plot-object inst, and sets up the relevant
% correspondences between the page locations and the plot-object's scale
% locations.

def plot_instantiate(suffix inst)(suffix plot_object) =

  % Define (unknown) parameters for plot-instance location on page

  numeric inst.pagewidth, inst.pageheight;
  numeric inst.pageleft, inst.pageright, inst.pagetop, inst.pagebottom;
  pair inst.llft, inst.lrt, inst.ulft, inst.urt;

  inst.pageleft + inst.pagewidth = inst.pageright;
  inst.pagebottom + inst.pageheight = inst.pagetop;
  inst.llft = (inst.pageleft, inst.pagebottom);
  inst.lrt = (inst.pageright, inst.pagebottom);
  inst.ulft = (inst.pageleft, inst.pagetop);
  inst.urt = (inst.pageright, inst.pagetop);

  % Define (known) parameters for plot's scaling
  
  numeric inst.scalewidth, inst.scaleheight;
  numeric inst.scaleleft, inst.scaleright, inst.scaletop, inst.scalebottom;

  inst.scaleleft := plot_object.xleft;
  inst.scaleright := plot_object.xright;
  inst.scalebottom := plot_object.ybot;
  inst.scaletop := plot_object.ytop;

  inst.scalewidth := inst.scaleright - inst.scaleleft;
  inst.scaleheight := inst.scaletop - inst.scalebottom;

  % Pointer-function to plot_object's plots, scaled and positioned.
  
  vardef inst.plot(suffix name) =
    begingroup
      save xleft; save xright; save ybot; save ytop;
      xleft = min(xpart(llcorner plot_object.name), 0.0);
      xright = max(xpart(urcorner plot_object.name), 1.0);
      ybot = min(ypart(llcorner plot_object.name), 0.0);
      ytop = max(ypart(urcorner plot_object.name), 1.0);
      setbounds plot_object.name to
        (xleft,ybot)--(xright,ybot)--(xright,ytop)--(xleft,ytop)--cycle;
    endgroup;
    plot_object.name xscaled inst.pagewidth yscaled inst.pageheight
                     shifted inst.llft
  enddef;
  
enddef;

% plot_setequalaxes(suffix inst)
%
% Sets the axis-scales equal on plot inst.

def plot_setequalaxes(suffix inst) =
  inst.pagewidth = inst.pageheight * (inst.scalewidth/inst.scaleheight);
enddef;


% plot_[x | y | x]pageloc(suffix inst,
%                         numeric [scalex | scaley | scalex, scaley])
%
% Scale-to-page conversion functions, which produce the value (or pair)
% for the page location that corresponds to the given x location, y
% location, or pair in plot-object inst's coordinates.

def plot_xpageloc(suffix inst)(expr scalex) =
  inst.pageleft + (inst.pagewidth/inst.scalewidth) * (scalex - inst.scaleleft)
enddef;
  
def plot_ypageloc(suffix inst)(expr scaley) =
  inst.pagebottom + (inst.pageheight/inst.scaleheight) * (scaley - inst.scalebottom)
enddef;
  
def plot_zpageloc(suffix inst)(expr scalex)(expr scaley) =
  (plot_xpageloc(inst, scalex), plot_ypageloc(inst,scaley))
enddef;


% plot_[x | y]scaleloc(suffix inst,
%                      numeric [pagex | pagey])
%
% Page-to-scale conversion functions, which produce the value
% for the location in plot-object inst's coordinates that corresponds
% to the given x location or y location on the page.

def plot_xscaleloc(suffix inst)(expr pagex) =
  inst.scaleleft + (inst.scalewidth/inst.pagewidth) * (pagex - inst.pageleft)
enddef;

def plot_yscaleloc(suffix inst)(expr pagey) =
  inst.scalebottom + (inst.scaleheight/inst.pageheight) * (pagey - inst.pagebottom)
enddef;



% plot_xtickscale(suffix inst,
%                pair startpoint,
%                pair endpoint,
%                numeric ticklength,
%                numeric tickspace,
%                pair tickdir,
%                numeric tickzero,
%                numeric tickstep,
%                string ticklabelformat)
%
% Draws a row of x-axis grid ticks from startpoint to endpoint,
% with the values determined by the x-scale of plot-object inst,
% and the details of the tick location and format determined 
% according to the axes_tickscale parameters.

def plot_xtickscale(suffix inst)
                   (expr startpoint, endpoint,
                         ticklength, tickspace, tickdir,
                         tickzero, tickstep, ticklabelformat) =
  axes_tickscale(startpoint, endpoint,
                 ticklength, tickspace, tickdir,
                 plot_xscaleloc(inst)(xpart(startpoint)),
                 plot_xscaleloc(inst)(xpart(endpoint)),
                 tickzero, tickstep, ticklabelformat)
enddef;


% plot_ytickscale(suffix inst,
%                pair startpoint,
%                pair endpoint,
%                numeric ticklength,
%                numeric tickspace,
%                pair tickdir,
%                numeric tickzero,
%                numeric tickstep,
%                string ticklabelformat)
%
% Draws a row of y-axis grid ticks from startpoint to endpoint,
% with the values determined by the y-scale of plot-object inst,
% and the details of the tick location and format determined 
% according to the axes_tickscale parameters.

def plot_ytickscale(suffix inst)
                   (expr startpoint, endpoint,
                         ticklength, tickspace, tickdir,
                         tickzero, tickstep, ticklabelformat) =
  axes_tickscale(startpoint, endpoint,
                 ticklength, tickspace, tickdir,
                 plot_yscaleloc(inst)(ypart(startpoint)),
                 plot_yscaleloc(inst)(ypart(endpoint)),
                 tickzero, tickstep, ticklabelformat)
enddef;