[gnome-clocks/wip/analogtimer] Play with a pattern for the timer cursor

[Paolo Borelli <pborelli src gnome org>]

commit 99e2eefa94856cf9bf22bdae3ea41c54f015c1f1
Author: Paolo Borelli <pborelli gnome org>
Date:   Thu Aug 1 17:42:50 2013 +0200

    Play with a pattern for the timer cursor

 src/timer.vala |   19 ++++++++++++++++++-
 1 files changed, 18 insertions(+), 1 deletions(-)
---
diff --git a/src/timer.vala b/src/timer.vala
index 62d324d..88258bc 100644
--- a/src/timer.vala
+++ b/src/timer.vala
@@ -24,6 +24,8 @@ public class CountdownFrame : Gtk.Frame {
 
     public double progress { get; set; }
 
+    private Cairo.Pattern cursor_pattern;
+
     private int calculate_diameter () {
         var child = get_child ();
         if (child != null && child.visible) {
@@ -69,7 +71,6 @@ public class CountdownFrame : Gtk.Frame {
         base.draw(cr);
 
         var context = get_style_context ();
-
         Gtk.Allocation allocation;
         get_allocation (out allocation);
         var center_x = allocation.width / 2;
@@ -97,6 +98,22 @@ public class CountdownFrame : Gtk.Frame {
             cr.arc (center_x, center_y, radius - 4.5, 1.5  * Math.PI, (1.5 + progress * 2 ) * Math.PI);
             Gdk.cairo_set_source_rgba (cr, color);
             cr.stroke ();
+
+            if (progress < 1) {
+                if (cursor_pattern == null) {
+                    cursor_pattern = new Cairo.Pattern.radial (0, 0, 6, 0, 0, 18);
+                    cursor_pattern.add_color_stop_rgba (0, color.red, color.green, color.blue, 1);
+                    cursor_pattern.add_color_stop_rgba (0.5, color.red, color.green, color.blue, 0);
+                }
+
+                var x = center_x + (radius -4.5) * Math.cos((1.5 + progress * 2) * Math.PI);
+                var y = center_y + (radius -4.5) * Math.sin((1.5 + progress * 2) * Math.PI);
+
+                cr.arc (x, y, 18, 0, 2 * Math.PI);
+                cr.translate (x, y);
+                cr.set_source (cursor_pattern);
+                cr.fill ();
+            }
         }
 
         return false;