[clutter] examples: Add transparency to the rounded rectangle

[Emmanuele Bassi <ebassi src gnome org>]

commit e15f520a9e8a44ce45c5742caadca0698736cf0e
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Apr 30 13:04:32 2015 +0100

    examples: Add transparency to the rounded rectangle
    
    Makes it a bit more fancy.

 examples/rounded-rectangle.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/examples/rounded-rectangle.c b/examples/rounded-rectangle.c
index e9fc2fd..6ffdb4c 100644
--- a/examples/rounded-rectangle.c
+++ b/examples/rounded-rectangle.c
@@ -38,7 +38,7 @@ draw_content (ClutterCanvas *canvas,
   cairo_arc (cr, x + radius, y + radius, radius, 180 * degrees, 270 * degrees);
   cairo_close_path (cr);
 
-  cairo_set_source_rgb (cr, 0.5, 0.5, 1);
+  cairo_set_source_rgba (cr, 0.5, 0.5, 1, 0.95);
   cairo_fill (cr);
 
   /* we're done drawing */
@@ -59,8 +59,10 @@ main (int argc, char *argv[])
   /* create a stage */
   stage = clutter_stage_new ();
   clutter_stage_set_title (CLUTTER_STAGE (stage), "Rectangle with rounded corners");
+  clutter_stage_set_use_alpha (CLUTTER_STAGE (stage), TRUE);
   clutter_actor_set_background_color (stage, CLUTTER_COLOR_Black);
   clutter_actor_set_size (stage, 500, 500);
+  clutter_actor_set_opacity (stage, 64);
   clutter_actor_show (stage);
 
   /* our 2D canvas, courtesy of Cairo */