private void gradientToolStripMenuItem_Click(object sender, EventArgs e)
{
lastSelected = "gradient";
OnPaintAction = cr =>
{
Gradient pat = new LinearGradient(0.0, 0.0, 0.0, 256.0);
pat.AddColorStopRgba(1, 0, 0, 0, 1);
pat.AddColorStopRgba(0, 1, 1, 1, 1);
cr.Rectangle(0, 0, 256, 256);
cr.SetSource(pat);
cr.Fill();
pat.Dispose();
pat = new RadialGradient(115.2, 102.4, 25.6,
102.4, 102.4, 128.0);
pat.AddColorStopRgba(0, 1, 1, 1, 1);
pat.AddColorStopRgba(1, 0, 0, 0, 1);
cr.SetSource(pat);
cr.Arc(128.0, 128.0, 76.8, 0, 2 * Math.PI);
cr.Fill();
pat.Dispose();
};
Invalidate();
}
public override void DrawPie (double fraction)
{
// Calculate the pie path
fraction = Theme.Clamp (0.0, 1.0, fraction);
double a1 = 3.0 * Math.PI / 2.0;
double a2 = a1 + 2.0 * Math.PI * fraction;
if (fraction == 0.0) {
return;
}
Context.Cairo.MoveTo (Context.X, Context.Y);
Context.Cairo.Arc (Context.X, Context.Y, Context.Radius, a1, a2);
Context.Cairo.LineTo (Context.X, Context.Y);
// Fill the pie
Color color_a = Colors.GetWidgetColor (GtkColorClass.Background, StateType.Selected);
Color color_b = CairoExtensions.ColorShade (color_a, 1.4);
RadialGradient fill = new RadialGradient (Context.X, Context.Y, 0,
Context.X, Context.Y, 2.0 * Context.Radius);
fill.AddColorStop (0, color_a);
fill.AddColorStop (1, color_b);
Context.Cairo.SetSource (fill);
Context.Cairo.FillPreserve ();
fill.Dispose ();
// Stroke the pie
Context.Cairo.SetSourceColor (CairoExtensions.ColorShade (color_a, 0.8));
Context.Cairo.LineWidth = Context.LineWidth;
Context.Cairo.Stroke ();
}
