mirror of
https://github.com/brl/mutter.git
synced 2024-12-12 14:20:17 +00:00
120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
#include <stdlib.h>
|
|
#include <math.h>
|
|
#include <cairo.h>
|
|
#include <clutter/clutter.h>
|
|
|
|
static gboolean
|
|
draw_clock (ClutterCairoTexture *canvas,
|
|
cairo_t *cr)
|
|
{
|
|
guint width, height;
|
|
GDateTime *now;
|
|
float hours, minutes, seconds;
|
|
|
|
/* get the current time and compute the angles */
|
|
now = g_date_time_new_now_local ();
|
|
seconds = g_date_time_get_second (now) * G_PI / 30;
|
|
minutes = g_date_time_get_minute (now) * G_PI / 30;
|
|
hours = g_date_time_get_hour (now) * G_PI / 6;
|
|
|
|
/* clear the contents of the canvas, to avoid painting
|
|
* over the previous frame
|
|
*/
|
|
clutter_cairo_texture_clear (canvas);
|
|
|
|
/* scale the modelview to the size of the surface */
|
|
clutter_cairo_texture_get_surface_size (canvas, &width, &height);
|
|
cairo_scale (cr, width, height);
|
|
|
|
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
|
|
cairo_set_line_width (cr, 0.1);
|
|
|
|
/* the black rail that holds the seconds indicator */
|
|
clutter_cairo_set_source_color (cr, CLUTTER_COLOR_Black);
|
|
cairo_translate (cr, 0.5, 0.5);
|
|
cairo_arc (cr, 0, 0, 0.4, 0, G_PI * 2);
|
|
cairo_stroke (cr);
|
|
|
|
/* the seconds indicator */
|
|
clutter_cairo_set_source_color (cr, CLUTTER_COLOR_White);
|
|
cairo_move_to (cr, 0, 0);
|
|
cairo_arc (cr, sinf (seconds) * 0.4, - cosf (seconds) * 0.4, 0.05, 0, G_PI * 2);
|
|
cairo_fill (cr);
|
|
|
|
/* the minutes hand */
|
|
clutter_cairo_set_source_color (cr, CLUTTER_COLOR_DarkChameleon);
|
|
cairo_move_to (cr, 0, 0);
|
|
cairo_line_to (cr, sinf (minutes) * 0.4, -cosf (minutes) * 0.4);
|
|
cairo_stroke (cr);
|
|
|
|
/* the hours hand */
|
|
cairo_move_to (cr, 0, 0);
|
|
cairo_line_to (cr, sinf (hours) * 0.2, -cosf (hours) * 0.2);
|
|
cairo_stroke (cr);
|
|
|
|
g_date_time_unref (now);
|
|
|
|
/* we're done drawing */
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
invalidate_clock (gpointer data_)
|
|
{
|
|
/* invalidate the contents of the canvas */
|
|
clutter_cairo_texture_invalidate (data_);
|
|
|
|
/* keep the timeout source */
|
|
return TRUE;
|
|
}
|
|
|
|
G_MODULE_EXPORT int
|
|
test_cairo_clock_main (int argc, char *argv[])
|
|
{
|
|
ClutterActor *stage, *canvas;
|
|
|
|
/* initialize Clutter */
|
|
if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
|
|
return EXIT_FAILURE;
|
|
|
|
/* create a resizable stage */
|
|
stage = clutter_stage_new ();
|
|
clutter_stage_set_title (CLUTTER_STAGE (stage), "2D Clock");
|
|
clutter_stage_set_user_resizable (CLUTTER_STAGE (stage), TRUE);
|
|
clutter_actor_set_background_color (stage, CLUTTER_COLOR_LightSkyBlue);
|
|
clutter_actor_set_size (stage, 300, 300);
|
|
clutter_actor_show (stage);
|
|
|
|
/* our 2D canvas, courtesy of Cairo */
|
|
canvas = clutter_cairo_texture_new (300, 300);
|
|
clutter_container_add_actor (CLUTTER_CONTAINER (stage), canvas);
|
|
|
|
/* bind the size of the canvas to that of the stage */
|
|
clutter_actor_add_constraint (canvas, clutter_bind_constraint_new (stage, CLUTTER_BIND_SIZE, 0));
|
|
|
|
/* make sure to match allocation to canvas size */
|
|
clutter_cairo_texture_set_auto_resize (CLUTTER_CAIRO_TEXTURE (canvas), TRUE);
|
|
|
|
/* quit on destroy */
|
|
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
|
|
|
|
/* connect our drawing code */
|
|
g_signal_connect (canvas, "draw", G_CALLBACK (draw_clock), NULL);
|
|
|
|
/* invalidate the canvas, so that we can draw before the main loop starts */
|
|
clutter_cairo_texture_invalidate (CLUTTER_CAIRO_TEXTURE (canvas));
|
|
|
|
/* set up a timer that invalidates the canvas every second */
|
|
clutter_threads_add_timeout (1000, invalidate_clock, canvas);
|
|
|
|
clutter_main ();
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
G_MODULE_EXPORT const char *
|
|
test_cairo_clock_describe (void)
|
|
{
|
|
return "Simple 2D canvas using a Cairo texture actor";
|
|
}
|