[pyclutter] examples: Add rounded rectangle example

[Emmanuele Bassi <ebassi src gnome org>]

commit 49bbc153e0034877fce68c5b72b4571420a885e4
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Apr 13 12:15:58 2015 +0100

    examples: Add rounded rectangle example
    
    Port from C, using pycairo.

 examples/Makefile.am          |    3 +-
 examples/rounded-rectangle.py |   63 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+), 1 deletions(-)
---
diff --git a/examples/Makefile.am b/examples/Makefile.am
index 1d7ac5b..163d1fa 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -1,3 +1,4 @@
 EXTRA_DIST = \
        basic-actor.py \
-       constraints.py
+       constraints.py \
+       rounded-rectangle.py
diff --git a/examples/rounded-rectangle.py b/examples/rounded-rectangle.py
new file mode 100644
index 0000000..82605dc
--- /dev/null
+++ b/examples/rounded-rectangle.py
@@ -0,0 +1,63 @@
+import math
+import cairo
+from gi.repository import GObject
+from gi.repository import Clutter
+
+def draw_content(canvas, cr, surface_width, surface_height):
+    padding = 2
+    x = padding
+    y = padding
+    width = surface_width - (padding * 2)
+    height = surface_height - (padding * 2)
+    aspect = 1.0
+    corner_radius = height / 20.0
+    radius = corner_radius / aspect
+    degrees = math.pi / 180
+
+    cr.save()
+    cr.set_operator(cairo.OPERATOR_CLEAR)
+    cr.paint()
+    cr.restore()
+
+    cr.new_sub_path()
+    cr.arc(x + width - radius, y + radius, radius, -90 * degrees, 0 * degrees)
+    cr.arc(x + width - radius, y + height - radius, radius, 0 * degrees, 90 * degrees)
+    cr.arc(x + radius, y + height - radius, radius, 90 * degrees, 180 * degrees)
+    cr.arc(x + radius, y + radius, radius, 180 * degrees, 270 * degrees)
+    cr.close_path()
+
+    cr.set_source_rgb(0.5, 0.5, 1)
+    cr.fill()
+
+    return True
+
+if __name__ == '__main__':
+    stage = Clutter.Stage()
+    stage.props.title = 'Rounded Rectangle'
+    stage.props.background_color = Clutter.Color.get_static(Clutter.StaticColor.BLACK)
+    stage.set_size(500, 500)
+    stage.show()
+
+    canvas = Clutter.Canvas(width=300, height=300)
+
+    actor = Clutter.Actor(content=canvas,
+                          content_gravity=Clutter.ContentGravity.CENTER,
+                          request_mode=Clutter.RequestMode.CONTENT_SIZE)
+    actor.set_content_scaling_filters(Clutter.ScalingFilter.TRILINEAR, Clutter.ScalingFilter.LINEAR)
+    actor.set_pivot_point(0.5, 0.5)
+    actor.add_constraint(Clutter.AlignConstraint(source=stage, align_axis=Clutter.AlignAxis.BOTH, 
factor=0.5))
+    stage.add_child(actor)
+
+    transition = Clutter.PropertyTransition('rotation-angle-y')
+    transition.set_from(0)
+    transition.set_to(360)
+    transition.set_duration(2000)
+    transition.set_repeat_count(-1)
+    actor.add_transition('rotateActor', transition)
+
+    stage.connect('destroy', Clutter.main_quit)
+
+    canvas.connect('draw', draw_content)
+    canvas.invalidate()
+
+    Clutter.main()