karma/flying-balls
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shaded ball pattern.

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This commit is contained in:
Antonio Carzaniga 2021-06-07 13:38:13 +02:00
parent d033118653
commit 5ba97e9edf
1 changed files with 15 additions and 2 deletions
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17
balls.c
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@ -465,6 +465,10 @@ struct ball_face {
cairo_surface_t ** c_faces; cairo_surface_t ** c_faces;
}; };
static double random_color_component() {
return 1.0*(rand() % 200 + 56)/255;
};
struct ball_face * new_ball_face(unsigned int radius, cairo_surface_t * face, int rotation) { struct ball_face * new_ball_face(unsigned int radius, cairo_surface_t * face, int rotation) {
struct ball_face * f = malloc(sizeof(struct ball_face)); struct ball_face * f = malloc(sizeof(struct ball_face));
if (!f) if (!f)
@ -497,8 +501,17 @@ struct ball_face * new_ball_face(unsigned int radius, cairo_surface_t * face, in
cairo_set_source_surface(ball_cr, face, -face_x_offset, -face_y_offset); cairo_set_source_surface(ball_cr, face, -face_x_offset, -face_y_offset);
cairo_paint(ball_cr); cairo_paint(ball_cr);
} else { } else {
cairo_set_source_rgb(ball_cr, 1.0*(rand() % 256)/255, 1.0*(rand() % 256)/255, 1.0*(rand() % 256)/255); cairo_pattern_t *pat;
cairo_paint(ball_cr); pat = cairo_pattern_create_radial (-0.2*radius, -0.2*radius, 0.2*radius,
-0.2*radius, -0.2*radius, 1.2*radius);
double col_r = random_color_component();
double col_g = random_color_component();
double col_b = random_color_component();
cairo_pattern_add_color_stop_rgba (pat, 0, col_r, col_g, col_b, 1);
cairo_pattern_add_color_stop_rgba (pat, 1, col_r/3, col_g/3, col_b/3, 1);
cairo_set_source (ball_cr, pat);
cairo_arc (ball_cr, 0.0, 0.0, radius, 0, 2 * M_PI);
cairo_fill (ball_cr);
} }
cairo_surface_flush(f->c_faces[i]); cairo_surface_flush(f->c_faces[i]);
cairo_destroy(ball_cr); cairo_destroy(ball_cr);