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111 lines
3.9 KiB
C
111 lines
3.9 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_content (ClutterCanvas *canvas,
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cairo_t *cr,
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int surface_width,
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int surface_height)
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{
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/* rounded rectangle taken from:
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*
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* http://cairographics.org/samples/rounded_rectangle/
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*
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* we leave 1 pixel around the edges to avoid jagged edges
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* when rotating the actor
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*/
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double x = 1.0, /* parameters like cairo_rectangle */
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y = 1.0,
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width = surface_width - 2.0,
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height = surface_height - 2.0,
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aspect = 1.0, /* aspect ratio */
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corner_radius = height / 20.0; /* and corner curvature radius */
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double radius = corner_radius / aspect;
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double degrees = M_PI / 180.0;
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cairo_save (cr);
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cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
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cairo_paint (cr);
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cairo_restore (cr);
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cairo_new_sub_path (cr);
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cairo_arc (cr, x + width - radius, y + radius, radius, -90 * degrees, 0 * degrees);
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cairo_arc (cr, x + width - radius, y + height - radius, radius, 0 * degrees, 90 * degrees);
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cairo_arc (cr, x + radius, y + height - radius, radius, 90 * degrees, 180 * degrees);
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cairo_arc (cr, x + radius, y + radius, radius, 180 * degrees, 270 * degrees);
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cairo_close_path (cr);
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cairo_set_source_rgba (cr, 0.5, 0.5, 1, 0.95);
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cairo_fill (cr);
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/* we're done drawing */
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return TRUE;
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}
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int
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main (int argc, char *argv[])
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{
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ClutterActor *stage, *actor;
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ClutterContent *canvas;
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ClutterTransition *transition;
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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 stage */
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stage = clutter_stage_new ();
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clutter_stage_set_title (CLUTTER_STAGE (stage), "Rectangle with rounded corners");
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clutter_stage_set_use_alpha (CLUTTER_STAGE (stage), TRUE);
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clutter_actor_set_background_color (stage, CLUTTER_COLOR_Black);
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clutter_actor_set_size (stage, 500, 500);
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clutter_actor_set_opacity (stage, 64);
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clutter_actor_show (stage);
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/* our 2D canvas, courtesy of Cairo */
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canvas = clutter_canvas_new ();
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clutter_canvas_set_size (CLUTTER_CANVAS (canvas), 300, 300);
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/* the actor that will display the contents of the canvas */
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actor = clutter_actor_new ();
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clutter_actor_set_content (actor, canvas);
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clutter_actor_set_content_gravity (actor, CLUTTER_CONTENT_GRAVITY_CENTER);
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clutter_actor_set_content_scaling_filters (actor,
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CLUTTER_SCALING_FILTER_TRILINEAR,
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CLUTTER_SCALING_FILTER_LINEAR);
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clutter_actor_set_pivot_point (actor, 0.5f, 0.5f);
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clutter_actor_add_constraint (actor, clutter_align_constraint_new (stage, CLUTTER_ALIGN_BOTH, 0.5));
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clutter_actor_set_request_mode (actor, CLUTTER_REQUEST_CONTENT_SIZE);
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clutter_actor_add_child (stage, actor);
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/* the actor now owns the canvas */
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g_object_unref (canvas);
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/* create the continuous animation of the actor spinning around its center */
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transition = clutter_property_transition_new ("rotation-angle-y");
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clutter_transition_set_from (transition, G_TYPE_DOUBLE, 0.0);
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clutter_transition_set_to (transition, G_TYPE_DOUBLE, 360.0);
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clutter_timeline_set_duration (CLUTTER_TIMELINE (transition), 2000);
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clutter_timeline_set_repeat_count (CLUTTER_TIMELINE (transition), -1);
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clutter_actor_add_transition (actor, "rotateActor", transition);
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/* the actor now owns the transition */
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g_object_unref (transition);
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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_content), NULL);
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/* invalidate the canvas, so that we can draw before the main loop starts */
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clutter_content_invalidate (canvas);
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clutter_main ();
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return EXIT_SUCCESS;
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}
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