static ALLEGRO_BITMAP *example_bitmap(int w, int h)
{
int i, j;
float mx = w * 0.5;
float my = h * 0.5;
ALLEGRO_STATE state;
ALLEGRO_BITMAP *pattern = al_create_bitmap(w, h);
al_store_state(&state, ALLEGRO_STATE_TARGET_BITMAP);
al_set_target_bitmap(pattern);
al_lock_bitmap(pattern, ALLEGRO_PIXEL_FORMAT_ANY, ALLEGRO_LOCK_WRITEONLY);
for (i = 0; i < w; i++) {
for (j = 0; j < h; j++) {
float a = atan2(i - mx, j - my);
float d = sqrt(pow(i - mx, 2) + pow(j - my, 2));
float sat = pow(1.0 - 1 / (1 + d * 0.1), 5);
float hue = 3 * a * 180 / ALLEGRO_PI;
hue = (hue / 360 - floorf(hue / 360)) * 360;
al_put_pixel(i, j, al_color_hsv(hue, sat, 1));
}
}
al_put_pixel(0, 0, al_map_rgb(0, 0, 0));
al_unlock_bitmap(pattern);
al_restore_state(&state);
return pattern;
}
static void draw(ALLEGRO_BITMAP *bitmap, int y, char const *text)
{
int i;
al_draw_text(font_ms, al_map_rgb(0, 0, 0), 0, y, 0, text);
for (i = 0; i < 16; i++) {
float a = 2 * ALLEGRO_PI * i / 16;
ALLEGRO_COLOR c = al_color_hsv(i * 360 / 16, 1, 1);
al_draw_line(150 + cos(a) * 10, y + 100 + sin(a) * 10,
150 + cos(a) * 90, y + 100 + sin(a) * 90, c, 3);
}
for (i = 0; i < 8; i++) {
float a = 2 * ALLEGRO_PI * i / 16;
int s = al_get_bitmap_width(bitmap);
al_draw_rotated_bitmap(bitmap, s / 2, s / 2,
50 + bitmap_x[i], y + bitmap_y[i], a, 0);
}
}
void Color::from_hsv(float h, float s, float v)
{
RAGE_CHECK_DISPOSED(disposed);
color = al_color_hsv(h, s, v);
}
void al_color_hsv_w(float h, float s, float v, ALLEGRO_COLOR *color)
{
*color = al_color_hsv(h, s, v);
}
