xy_plot.c 7.95 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
#include "gui.h"
#include "gui_defs.h"
#include "x.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

static void paint(gui *_gui, widget *_this)
{
  struct gui *g = _gui;
  struct xy_plot_widget *this = _this;
  int wanted_plot_width, allocated_plot_width;
  int wanted_plot_height, allocated_plot_height;
  float pxsize;
  float ticdist;
  float tic;
  float ticstep;
  int k, kmin, kmax;
  float allocated_xmin, allocated_xmax;
  float allocated_ymin, allocated_ymax;
  float center;
Cedric Roux's avatar
Cedric Roux committed
23
  int i;
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

printf("PAINT xy plot xywh %d %d %d %d\n", this->common.x, this->common.y, this->common.width, this->common.height);

//x_draw_rectangle(g->x, g->xwin, 1, this->common.x, this->common.y, this->common.width, this->common.height);

  /* plot zone */
  /* TODO: refine height - height of hrule text may be != from label */
  x_draw_rectangle(g->x, g->xwin, 1,
      this->common.x + this->vrule_width,
      this->common.y,
      this->common.width - this->vrule_width -1, /* -1 to see right border */
      this->common.height - this->label_height * 2);

  /* horizontal tics */
  wanted_plot_width = this->wanted_width;
  allocated_plot_width = this->common.width - this->vrule_width;
  pxsize = (this->xmax - this->xmin) / wanted_plot_width;
  ticdist = 100;
  tic = floor(log10(ticdist * pxsize));
  ticstep = powf(10, tic);
  center = (this->xmax + this->xmin) / 2;
  allocated_xmin = center - ((this->xmax - this->xmin) *
                             allocated_plot_width / wanted_plot_width) / 2;
  allocated_xmax = center + ((this->xmax - this->xmin) *
                             allocated_plot_width / wanted_plot_width) / 2;
  /* adjust tic if too tight */
printf("pre x ticstep %g\n", ticstep);
  while (1) {
    if (ticstep / (allocated_xmax - allocated_xmin)
                * (allocated_plot_width - 1) > 40) break;
    ticstep *= 2;
  }
printf("post x ticstep %g\n", ticstep);
printf("xmin/max %g %g width wanted allocated %d %d alloc xmin/max %g %g ticstep %g\n", this->xmin, this->xmax, wanted_plot_width, allocated_plot_width, allocated_xmin, allocated_xmax, ticstep);
  kmin = ceil(allocated_xmin / ticstep);
  kmax = floor(allocated_xmax / ticstep);
  for (k = kmin; k <= kmax; k++) {
/*
    (k * ticstep - allocated_xmin) / (allocated_max - allocated_xmin) =
    (x - 0) / (allocated_plot_width-1 - 0)
 */
    char v[64];
    int vwidth, dummy;
    float x = (k * ticstep - allocated_xmin) /
              (allocated_xmax - allocated_xmin) *
              (allocated_plot_width - 1);
    x_draw_line(g->x, g->xwin, FOREGROUND_COLOR,
        this->common.x + this->vrule_width + x,
        this->common.y + this->common.height - this->label_height * 2,
        this->common.x + this->vrule_width + x,
        this->common.y + this->common.height - this->label_height * 2 - 5);
    sprintf(v, "%g", k * ticstep);
    x_text_get_dimensions(g->x, v, &vwidth, &dummy, &dummy);
    x_draw_string(g->x, g->xwin, FOREGROUND_COLOR,
        this->common.x + this->vrule_width + x - vwidth/2,
Cedric Roux's avatar
Cedric Roux committed
79
80
        this->common.y + this->common.height - this->label_height * 2 +
            this->label_baseline,
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
        v);
printf("tic k %d val %g x %g\n", k, k * ticstep, x);
  }

  /* vertical tics */
  wanted_plot_height = this->wanted_height;
  allocated_plot_height = this->common.height - this->label_height * 2;
  pxsize = (this->ymax - this->ymin) / wanted_plot_height;
  ticdist = 30;
  tic = floor(log10(ticdist * pxsize));
  ticstep = powf(10, tic);
  center = (this->ymax + this->ymin) / 2;
  allocated_ymin = center - ((this->ymax - this->ymin) *
                             allocated_plot_height / wanted_plot_height) / 2;
  allocated_ymax = center + ((this->ymax - this->ymin) *
                             allocated_plot_height / wanted_plot_height) / 2;
  /* adjust tic if too tight */
printf("pre y ticstep %g\n", ticstep);
  while (1) {
    if (ticstep / (allocated_ymax - allocated_ymin)
                * (allocated_plot_height - 1) > 20) break;
    ticstep *= 2;
  }
printf("post y ticstep %g\n", ticstep);
printf("ymin/max %g %g height wanted allocated %d %d alloc ymin/max %g %g ticstep %g\n", this->ymin, this->ymax, wanted_plot_height, allocated_plot_height, allocated_ymin, allocated_ymax, ticstep);
  kmin = ceil(allocated_ymin / ticstep);
  kmax = floor(allocated_ymax / ticstep);
  for (k = kmin; k <= kmax; k++) {
    char v[64];
    int vwidth, dummy;
    float y = (k * ticstep - allocated_ymin) /
              (allocated_ymax - allocated_ymin) *
              (allocated_plot_height - 1);
    sprintf(v, "%g", k * ticstep);
    x_text_get_dimensions(g->x, v, &vwidth, &dummy, &dummy);
    x_draw_line(g->x, g->xwin, FOREGROUND_COLOR,
        this->common.x + this->vrule_width,
        this->common.y + y,
        this->common.x + this->vrule_width + 5,
        this->common.y + y);
    x_draw_string(g->x, g->xwin, FOREGROUND_COLOR,
        this->common.x + this->vrule_width - vwidth - 2,
        this->common.y + y - this->label_height / 2 + this->label_baseline,
        v);
  }

  /* label at bottom, in the middle */
  x_draw_string(g->x, g->xwin, FOREGROUND_COLOR,
      this->common.x + (this->common.width - this->label_width) / 2,
      this->common.y + this->common.height - this->label_height
          + this->label_baseline,
      this->label);
Cedric Roux's avatar
Cedric Roux committed
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150

  /* points */
  float ax, bx, ay, by;
  ax = (allocated_plot_width-1) / (allocated_xmax - allocated_xmin);
  bx = -ax * allocated_xmin;
  ay = (allocated_plot_height-1) / (allocated_ymax - allocated_ymin);
  by = -ay * allocated_ymin;
  for (i = 0; i < this->npoints; i++) {
    int x, y;
    x = ax * this->x[i] + bx;
    y = ay * this->y[i] + by;
    if (x >= 0 && x < allocated_plot_width &&
        y >= 0 && y < allocated_plot_height)
      x_add_point(g->x,
          this->common.x + this->vrule_width + x,
          this->common.y + y);
  }
  x_plot_points(g->x, g->xwin, FOREGROUND_COLOR);
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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
}

static void hints(gui *_gui, widget *_w, int *width, int *height)
{
  struct xy_plot_widget *w = _w;
  *width = w->wanted_width + w->vrule_width;
  *height = w->wanted_height + w->label_height * 2; /* TODO: refine */
printf("HINTS xy plot wh %d %d (vrule_width %d) (wanted wh %d %d)\n", *width, *height, w->vrule_width, w->wanted_width, w->wanted_height);
}

widget *new_xy_plot(gui *_gui, int width, int height, char *label,
    int vruler_width)
{
  struct gui *g = _gui;
  struct xy_plot_widget *w;

  glock(g);

  w = new_widget(g, XY_PLOT, sizeof(struct xy_plot_widget));

  w->label = strdup(label); if (w->label == NULL) OOM;
  /* TODO: be sure calling X there is valid wrt "global model" (we are
   * not in the "gui thread") */
  x_text_get_dimensions(g->x, label, &w->label_width, &w->label_height,
      &w->label_baseline);
printf("XY PLOT label wh %d %d\n", w->label_width, w->label_height);

  w->wanted_width = width;
  w->wanted_height = height;
  w->vrule_width = vruler_width;

  w->xmin = -1;
  w->xmax = 1;
  w->ymin = -1;
  w->ymax = 1;

  w->common.paint = paint;
  w->common.hints = hints;

  gunlock(g);

  return w;
}
Cedric Roux's avatar
Cedric Roux committed
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239

/*************************************************************************/
/*                           public functions                            */
/*************************************************************************/

void xy_plot_set_range(gui *_gui, widget *_this,
    float xmin, float xmax, float ymin, float ymax)
{
  struct gui *g = _gui;
  struct xy_plot_widget *this = _this;

  glock(g);

  this->xmin = xmin;
  this->xmax = xmax;
  this->ymin = ymin;
  this->ymax = ymax;

  send_event(g, DIRTY, this->common.id);

  gunlock(g);
}

void xy_plot_set_points(gui *_gui, widget *_this,
    int npoints, float *x, float *y)
{
  struct gui *g = _gui;
  struct xy_plot_widget *this = _this;

  glock(g);

  if (npoints != this->npoints) {
    free(this->x);
    free(this->y);
    this->x = calloc(sizeof(float), npoints);
    this->y = calloc(sizeof(float), npoints);
    this->npoints = npoints;
  }

  memcpy(this->x, x, npoints * sizeof(float));
  memcpy(this->y, y, npoints * sizeof(float));

  send_event(g, DIRTY, this->common.id);

  gunlock(g);
}