private void RenderBackground(Cairo.Context cr)
{
rand = rand ?? new Random ();
if (circles == null) {
for (int i = 0, n = rand.Next (100, 150); i < n; i++) {
circles = circles ?? new Circle[n];
circles[i] = new Circle {
X = rand.Next (0, Screen.Width),
Y = rand.Next (0, Screen.Height),
R = rand.Next (10, 70),
A = rand.NextDouble () * 0.08
};
}
}
Gdk.Rectangle damage = new Gdk.Rectangle();
cr.RenderDamage (damage);
//cr.Rectangle (damage.X, damage.Y, damage.Width, damage.Height);
//cr.Clip ();
cr.Translate (Allocation.X, Allocation.Y);
cr.Rectangle (0, 0, Allocation.Width, Allocation.Height);
if (render_gradient) {
var grad = new Cairo.LinearGradient (0, 0, 0, Allocation.Height);
grad.AddColorStop (0.7, CairoExtensions.GdkRGBAToCairoColor (StyleContext.GetBackgroundColor (StateFlags.Prelight)));
grad.AddColorStop (1, CairoExtensions.GdkRGBAToCairoColor (StyleContext.GetBackgroundColor (StateFlags.Normal)));
cr.SetSource (grad);
cr.Fill ();
grad.Dispose ();
foreach (var circle in circles) {
cr.SetSourceColor (new Cairo.Color (0, 0, 0, circle.A));
cr.Arc (circle.X + circle.R, circle.Y + circle.R, circle.R, 0, 2 * Math.PI);
cr.Fill ();
}
} else {
cr.SetSourceColor (new Cairo.Color (1, 1, 1));
cr.Fill ();
}
if (window_decorator != null) {
window_decorator.Render (cr);
}
if (render_debug) {
cr.LineWidth = 1.0;
cr.SetSourceColor (CairoExtensions.RgbToColor (
(uint)rand.Next (0, 0xffffff)));
cr.Rectangle (damage.X + 0.5, damage.Y + 0.5, damage.Width - 1, damage.Height - 1);
cr.Stroke ();
}
cr.ResetClip ();
}
