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#include <clutter/clutter.h>
#include <clutter-cairo.h>
#include <math.h>
#define N_BUBBLES 50
#define BUBBLE_R 128
#define SCREEN_W 640
#define SCREEN_H 480
static ClutterActor *
create_bubble ()
{
cairo_t *cr;
cairo_pattern_t *pattern;
ClutterActor *bubble;
bubble = clutter_cairo_new (BUBBLE_R*2, BUBBLE_R*2);
cr = clutter_cairo_create (CLUTTER_CAIRO (bubble));
cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
cairo_paint (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
cairo_arc (cr, BUBBLE_R, BUBBLE_R, BUBBLE_R, 0.0, 2*M_PI);
pattern = cairo_pattern_create_radial (BUBBLE_R, BUBBLE_R, 0,
BUBBLE_R, BUBBLE_R, BUBBLE_R);
cairo_pattern_add_color_stop_rgba (pattern, 0, 0.88, 0.95, 0.99, 0.1);
cairo_pattern_add_color_stop_rgba (pattern, 0.6, 0.88, 0.95, 0.99, 0.1);
cairo_pattern_add_color_stop_rgba (pattern, 0.8, 0.67, 0.83, 0.91, 0.2);
cairo_pattern_add_color_stop_rgba (pattern, 0.9, 0.5, 0.67, 0.88, 0.7);
cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.3, 0.43, 0.69, 0.8);
cairo_set_source (cr, pattern);
cairo_fill_preserve (cr);
cairo_pattern_destroy (pattern);
pattern = cairo_pattern_create_linear (0, 0, BUBBLE_R*2, BUBBLE_R*2);
cairo_pattern_add_color_stop_rgba (pattern, 0.0, 1.0, 1.0, 1.0, 0.0);
cairo_pattern_add_color_stop_rgba (pattern, 0.15, 1.0, 1.0, 1.0, 0.95);
cairo_pattern_add_color_stop_rgba (pattern, 0.3, 1.0, 1.0, 1.0, 0.0);
cairo_pattern_add_color_stop_rgba (pattern, 0.7, 1.0, 1.0, 1.0, 0.0);
cairo_pattern_add_color_stop_rgba (pattern, 0.85, 1.0, 1.0, 1.0, 0.95);
cairo_pattern_add_color_stop_rgba (pattern, 1.0, 1.0, 1.0, 1.0, 0.0);
cairo_set_source (cr, pattern);
cairo_fill (cr);
cairo_pattern_destroy (pattern);
cairo_destroy (cr);
return bubble;
}
static void
bubble_y_notify (ClutterActor *actor,
GParamSpec *pspec,
ClutterContainer *stage)
{
gint size;
gdouble *angular, *linear;
if (clutter_actor_get_y (actor) > -(gint)clutter_actor_get_height (actor))
return;
size = g_random_int_range (BUBBLE_R/4, BUBBLE_R*2);
clutter_actor_set_size (actor, size, size);
clutter_actor_set_rotation (actor, CLUTTER_Z_AXIS,
g_random_double_range (0.0, 360.0),
size/2, size/2, 0);
clutter_actor_set_position (actor,
g_random_int_range (0, SCREEN_W-BUBBLE_R),
g_random_int_range (SCREEN_H*2, SCREEN_H*3));
clutter_actor_set_opacity (actor, g_random_int_range (80, 255));
linear = g_object_get_data (G_OBJECT (actor), "linear");
if (!linear)
linear = g_slice_new (gdouble);
*linear = g_random_double_range (0.5, 3.0);
g_object_set_data (G_OBJECT (actor), "linear", linear);
angular = g_object_get_data (G_OBJECT (actor), "angular");
if (!angular)
angular = g_slice_new (gdouble);
*angular = g_random_double_range (-0.5, 0.5);
g_object_set_data (G_OBJECT (actor), "angular", angular);
}
static void
timeline_new_frame_cb (ClutterTimeline *timeline,
gint frame_num,
ClutterActor *actor)
{
gint radius;
guint delta = clutter_timeline_get_delta (timeline, NULL);
gdouble *linear = g_object_get_data (G_OBJECT (actor), "linear");
gdouble angular =
*((gdouble *)g_object_get_data (G_OBJECT (actor), "angular"));
angular *= (gdouble)delta;
clutter_actor_set_yu (actor, clutter_actor_get_yu (actor) -
(CLUTTER_UNITS_FROM_FLOAT (*linear) * delta));
clutter_actor_set_xu (actor, clutter_actor_get_xu (actor) +
(CLUTTER_UNITS_FROM_FLOAT (angular)));
angular += clutter_actor_get_rotation (actor, CLUTTER_Z_AXIS,
NULL, NULL, NULL);
while (angular > 360)
angular -= 360.0;
while (angular < 0)
angular += 360.0;
radius = clutter_actor_get_width (actor)/2;
clutter_actor_set_rotation (actor, CLUTTER_Z_AXIS,
angular, radius, radius, 0);
}
int
main (int argc, char **argv)
{
const ClutterColor bg_color = { 0xe0, 0xf2, 0xfc, 0xff };
ClutterActor *stage, *bubble;
ClutterTimeline *timeline;
gint i;
clutter_init (&argc, &argv);
stage = clutter_stage_get_default ();
clutter_actor_set_size (stage, SCREEN_W, SCREEN_H);
clutter_stage_set_color (CLUTTER_STAGE (stage), &bg_color);
timeline = clutter_timeline_new_for_duration (1000);
clutter_timeline_set_loop (timeline, TRUE);
bubble = create_bubble ();
for (i = 0; i < N_BUBBLES; i++)
{
ClutterActor *actor;
actor = clutter_clone_texture_new (CLUTTER_TEXTURE (bubble));
clutter_actor_set_position (actor, i * BUBBLE_R*2, -BUBBLE_R*2);
clutter_container_add_actor (CLUTTER_CONTAINER (stage), actor);
g_signal_connect (actor, "notify::y",
G_CALLBACK (bubble_y_notify), stage);
g_signal_connect (timeline, "new-frame",
G_CALLBACK (timeline_new_frame_cb), actor);
bubble_y_notify (actor, NULL, CLUTTER_CONTAINER (stage));
}
g_object_unref (bubble);
clutter_actor_show_all (stage);
clutter_timeline_start (timeline);
clutter_main ();
return 0;
}
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