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