xy_plot.c 8.02 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
# define FLIP(v) (-(v) + allocated_plot_height-1)

Cedric Roux's avatar
Cedric Roux committed
27
  LOGD("PAINT xy plot xywh %d %d %d %d\n", this->common.x, this->common.y, this->common.width, this->common.height);
28
29
30

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

31
32
33
34
35
  wanted_plot_width = this->wanted_width;
  allocated_plot_width = this->common.width - this->vrule_width;
  wanted_plot_height = this->wanted_height;
  allocated_plot_height = this->common.height - this->label_height * 2;

36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
  /* 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 */
  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 */
Cedric Roux's avatar
Cedric Roux committed
55
  LOGD("pre x ticstep %g\n", ticstep);
56
57
58
59
60
  while (1) {
    if (ticstep / (allocated_xmax - allocated_xmin)
                * (allocated_plot_width - 1) > 40) break;
    ticstep *= 2;
  }
Cedric Roux's avatar
Cedric Roux committed
61
62
  LOGD("post x ticstep %g\n", ticstep);
  LOGD("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);
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
  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
84
85
        this->common.y + this->common.height - this->label_height * 2 +
            this->label_baseline,
86
        v);
Cedric Roux's avatar
Cedric Roux committed
87
    LOGD("tic k %d val %g x %g\n", k, k * ticstep, x);
88
89
90
91
92
93
94
95
96
97
98
99
100
  }

  /* vertical tics */
  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 */
Cedric Roux's avatar
Cedric Roux committed
101
  LOGD("pre y ticstep %g\n", ticstep);
102
103
104
105
106
  while (1) {
    if (ticstep / (allocated_ymax - allocated_ymin)
                * (allocated_plot_height - 1) > 20) break;
    ticstep *= 2;
  }
Cedric Roux's avatar
Cedric Roux committed
107
108
  LOGD("post y ticstep %g\n", ticstep);
  LOGD("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);
109
110
111
112
113
114
115
116
117
118
119
120
  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,
121
        this->common.y + FLIP(y),
122
        this->common.x + this->vrule_width + 5,
123
        this->common.y + FLIP(y));
124
125
    x_draw_string(g->x, g->xwin, FOREGROUND_COLOR,
        this->common.x + this->vrule_width - vwidth - 2,
126
        this->common.y + FLIP(y) - this->label_height/2+this->label_baseline,
127
128
129
130
131
132
133
134
135
        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
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,
151
          this->common.y + FLIP(y));
Cedric Roux's avatar
Cedric Roux committed
152
153
  }
  x_plot_points(g->x, g->xwin, FOREGROUND_COLOR);
154
155
156
157
158
159
160
}

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 */
Cedric Roux's avatar
Cedric Roux committed
161
  LOGD("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);
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
}

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);
Cedric Roux's avatar
Cedric Roux committed
179
  LOGD("XY PLOT label wh %d %d\n", w->label_width, w->label_height);
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196

  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
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
240
241
242

/*************************************************************************/
/*                           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);
}