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/*
* Example program for the Allegro library, by Shawn Hargreaves.
*
* This program shows how to convert colors between the RGB and HSV
* representations.
*/
#include "allegro.h"
/* slider types (R, G, B, and H, S, V) */
#define S_R 0
#define S_G 1
#define S_B 2
#define S_H 3
#define S_S 4
#define S_V 5
/* the current color values */
static int colors[6] =
{
255, /* red */
255, /* green */
255, /* blue */
0, /* hue */
0, /* saturation */
255 /* value */
};
/* helper for changing one of the color values */
int update_color(void *dp3, int val)
{
int type = ((unsigned long)dp3 - (unsigned long)colors) / sizeof(colors[0]);
int r, g, b;
float h, s, v;
RGB rgb;
if (colors[type] != val) {
colors[type] = val;
if ((type == S_R) || (type == S_G) || (type == S_B)) {
/* convert RGB color to HSV */
r = colors[S_R];
g = colors[S_G];
b = colors[S_B];
rgb_to_hsv(r, g, b, &h, &s, &v);
colors[S_H] = h * 255.0 / 360.0;
colors[S_S] = s * 255.0;
colors[S_V] = v * 255.0;
}
else {
/* convert HSV color to RGB */
h = colors[S_H] * 360.0 / 255.0;
s = colors[S_S] / 255.0;
v = colors[S_V] / 255.0;
hsv_to_rgb(h, s, v, &r, &g, &b);
colors[S_R] = r;
colors[S_G] = g;
colors[S_B] = b;
}
/* set the screen background to the new color */
rgb.r = colors[S_R]/4;
rgb.g = colors[S_G]/4;
rgb.b = colors[S_B]/4;
vsync();
set_color(0, &rgb);
}
return D_O_K;
}
/* gui object procedure for the color selection sliders */
int my_slider_proc(int msg, DIALOG *d, int c)
{
int *color = (int *)d->dp3;
switch (msg) {
case MSG_START:
/* initialise the slider position */
d->d2 = *color;
break;
case MSG_IDLE:
/* has the slider position changed? */
if (d->d2 != *color) {
d->d2 = *color;
show_mouse(NULL);
object_message(d, MSG_DRAW, 0);
show_mouse(screen);
}
break;
}
return d_slider_proc(msg, d, c);
}
DIALOG the_dlg[] =
{
/* (dialog proc) (x) (y) (w) (h) (fg) (bg) (key) (flags) (d1) (d2) (dp) (dp2) (dp3) */
{ my_slider_proc, 32, 32, 256, 16, 1, 0, 0, 0, 255, 0, NULL, update_color, &colors[S_R] },
{ my_slider_proc, 48, 64, 256, 16, 2, 0, 0, 0, 255, 0, NULL, update_color, &colors[S_G] },
{ my_slider_proc, 64, 96, 256, 16, 4, 0, 0, 0, 255, 0, NULL, update_color, &colors[S_B] },
{ my_slider_proc, 320, 368, 256, 16, 255, 0, 0, 0, 255, 0, NULL, update_color, &colors[S_H] },
{ my_slider_proc, 336, 400, 256, 16, 255, 0, 0, 0, 255, 0, NULL, update_color, &colors[S_S] },
{ my_slider_proc, 352, 432, 256, 16, 255, 0, 0, 0, 255, 0, NULL, update_color, &colors[S_V] },
{ d_text_proc, 300, 38, 0, 0, 255, 0, 0, 0, 0, 0, "R", NULL, NULL },
{ d_text_proc, 316, 70, 0, 0, 255, 0, 0, 0, 0, 0, "G", NULL, NULL },
{ d_text_proc, 332, 102, 0, 0, 255, 0, 0, 0, 0, 0, "B", NULL, NULL },
{ d_text_proc, 302, 374, 0, 0, 255, 0, 0, 0, 0, 0, "H", NULL, NULL },
{ d_text_proc, 318, 406, 0, 0, 255, 0, 0, 0, 0, 0, "S", NULL, NULL },
{ d_text_proc, 334, 438, 0, 0, 255, 0, 0, 0, 0, 0, "V", NULL, NULL },
{ NULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, NULL, NULL }
};
int main()
{
allegro_init();
install_keyboard();
install_mouse();
install_timer();
if (set_gfx_mode(GFX_AUTODETECT, 640, 480, 0, 0) != 0) {
allegro_message("Error setting graphics mode\n%s\n", allegro_error);
return 1;
}
set_palette(desktop_palette);
clear_bitmap(screen);
do_dialog(the_dlg, -1);
return 0;
}
END_OF_MAIN();
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