#include <stdarg.h>
#include <math.h>
+#include <lcms.h>
+
typedef struct _acre_data_point_2d {
double x;
double y;
double max;
} acre_axis_t;
+typedef struct _acre_color {
+ double red;
+ double green;
+ double blue;
+} acre_color_t;
+
struct _acre {
char *title;
acre_axis_t x_axis;
/* Data for drawing. */
cairo_t *cr;
PangoFontDescription *font;
- struct { double r; double g; double b;} colors[3];
+ acre_color_t *colors;
+ int colors_size;
int num_colors;
/* Total size including labels. */
acre->data_size = 0;
acre->num_data = 0;
+ acre->cr = NULL;
+ acre->font = NULL;
+ acre->colors = NULL;
+ acre->num_colors = 0;
+
+ acre->width = 0;
+ acre->height = 0;
+
acre->chart.x = 0;
acre->chart.y = 0;
acre->chart.width = 0;
free (acre->data);
+ free (acre->colors);
+
free (acre);
}
cairo_restore (cr);
}
+static void
+_acre_color_from_hsv (acre_color_t *color,
+ double hue,
+ double saturation,
+ double value)
+{
+ double f, p, q, t;
+ int hmod6;
+
+ hmod6 = (int) floor (hue / 60) % 6;
+ f = hue / 60 - floor (hue / 60);
+ p = value * (1 - saturation);
+ q = value * (1 - f * saturation);
+ t = value * (1 - (1 - f) * saturation);
+
+ switch (hmod6) {
+ case 0:
+ color->red = value;
+ color->green = t;
+ color->blue = p;
+ break;
+ case 1:
+ color->red = q;
+ color->green = value;
+ color->blue = p;
+ break;
+ case 2:
+ color->red = p;
+ color->green = value;
+ color->blue = t;
+ break;
+ case 3:
+ color->red = p;
+ color->green = q;
+ color->blue = value;
+ break;
+ case 4:
+ color->red = t;
+ color->green = p;
+ color->blue = value;
+ break;
+ case 5:
+ color->red = value;
+ color->green = p;
+ color->blue = q;
+ break;
+ }
+}
+
static void
_choose_colors (acre_t *acre)
{
- /* XXX: Should choose N, equally-spaced colors from a perceptually
- * linear space here. */
- acre->num_colors = 3;
+ cmsHPROFILE lab_profile, srgb_profile;
+ cmsHTRANSFORM lab_to_srgb;
+ int i;
+ double theta, radius, srgb[3];
+ cmsCIELab lab;
+
+ lab_profile = cmsCreateLabProfile (NULL); /* D50 */
+ srgb_profile = cmsCreate_sRGBProfile ();
+
+ lab_to_srgb = cmsCreateTransform (lab_profile, TYPE_Lab_DBL,
+ srgb_profile, TYPE_RGB_DBL,
+ INTENT_PERCEPTUAL, 0);
+
+ acre->num_colors = acre->num_data;
- acre->colors[0].r = 1;
- acre->colors[0].g = 0;
- acre->colors[0].b = 0;
+ if (acre->num_colors > acre->colors_size) {
+ acre->colors_size = acre->num_colors;
+ acre->colors = xrealloc (acre->colors,
+ acre->colors_size * sizeof (acre_color_t));
+ }
+
+ lab.L = 36;
+ radius = 130;
+ for (i = 0; i < acre->num_colors; i++) {
+ theta = 0.713 + 2 * M_PI * (double) i / acre->num_colors;
+ lab.a = radius * cos (theta);
+ lab.b = radius * sin (theta);
- acre->colors[1].r = 0;
- acre->colors[1].g = 1;
- acre->colors[1].b = 0;
+ cmsDoTransform (lab_to_srgb, &lab, srgb, 1);
+
+ acre->colors[i].red = srgb[0];
+ acre->colors[i].green = srgb[1];
+ acre->colors[i].blue = srgb[2];
+ }
- acre->colors[2].r = 0;
- acre->colors[2].g = 0;
- acre->colors[2].b = 1;
+ cmsDeleteTransform (lab_to_srgb);
+ cmsCloseProfile (lab_profile);
+ cmsCloseProfile (srgb_profile);
}
static void
for (d = 0; d < acre->num_data; d++) {
int color = d % acre->num_colors;
cairo_set_source_rgb (cr,
- acre->colors[color].r,
- acre->colors[color].g,
- acre->colors[color].b);
+ acre->colors[color].red,
+ acre->colors[color].green,
+ acre->colors[color].blue);
data = acre->data[d];
cairo_new_path (cr);
for (i = 0; i < data->num_points; i++) {
cairo_translate (cr, ACRE_LEGEND_PAD, ACRE_LEGEND_PAD);
for (i = 0; i < acre->num_data; i++) {
- cairo_move_to (cr, 0, ACRE_FONT_SIZE / 2 + 0.5);
- cairo_rel_line_to (cr, ACRE_LEGEND_LINE_SIZE, 0);
+ cairo_rectangle (cr,
+ 0, ACRE_LEGEND_LINE_SIZE / 2,
+ ACRE_LEGEND_LINE_SIZE, ACRE_LEGEND_LINE_SIZE / 2);
cairo_set_source_rgb (cr,
- acre->colors[i % acre->num_colors].r,
- acre->colors[i % acre->num_colors].g,
- acre->colors[i % acre->num_colors].b);
- cairo_stroke (cr);
+ acre->colors[i % acre->num_colors].red,
+ acre->colors[i % acre->num_colors].green,
+ acre->colors[i % acre->num_colors].blue);
+ cairo_fill (cr);
layout = _create_layout (acre, acre->data[i]->name);
cairo_move_to (cr, ACRE_LEGEND_LINE_SIZE + ACRE_LEGEND_PAD, 0);