public static void DrawRadialGradient(this Context g, Surface oldsurface, GradientColorMode mode, Color c1, Color c2, PointD p1, PointD p2, double r1, double r2)
{
g.Save();
Gradient gradient = new Cairo.RadialGradient(p1.X, p1.Y, r1, p2.X, p2.Y, r2);
if (mode == GradientColorMode.Color)
{
gradient.AddColorStop(0, c1);
gradient.AddColorStop(1, c2);
g.Source = gradient;
g.Paint();
}
else if (mode == GradientColorMode.Transparency)
{
gradient.AddColorStop(0, new Color(0, 0, 0, 1));
gradient.AddColorStop(1, new Color(0, 0, 0, 0));
g.Source = new SurfacePattern(oldsurface);
g.Mask(gradient);
}
g.Restore();
}
public static void DrawRadialGradient(this Context g, Surface oldsurface, GradientColorMode mode, Cairo.Color c1, Cairo.Color c2, PointD p1, PointD p2, double r1, double r2)
{
g.Save ();
Gradient gradient = new Cairo.RadialGradient (p1.X, p1.Y, r1, p2.X, p2.Y, r2);
if (mode == GradientColorMode.Color) {
gradient.AddColorStop (0, c1);
gradient.AddColorStop (1, c2);
g.Source = gradient;
g.Paint ();
}
else if (mode == GradientColorMode.Transparency) {
gradient.AddColorStop (0, new Cairo.Color (0, 0, 0, 1));
gradient.AddColorStop (1, new Cairo.Color (0, 0, 0, 0));
g.Source = new SurfacePattern (oldsurface);
g.Mask (gradient);
}
g.Restore ();
}
public static void DrawLinearReflectedGradient (this Context g, Surface oldsurface, GradientColorMode mode, Color c1, Color c2, PointD p1, PointD p2)
{
g.Save ();
Gradient gradient = new Cairo.LinearGradient (p1.X, p1.Y, p2.X, p2.Y);
if (mode == GradientColorMode.Color) {
gradient.AddColorStop (0, c1);
gradient.AddColorStop (0.5, c2);
gradient.AddColorStop (1, c1);
g.SetSource (gradient);
g.Paint ();
} else if (mode == GradientColorMode.Transparency) {
gradient.AddColorStop (0, new Color (0, 0, 0, 1));
gradient.AddColorStop (0.5, new Color (0, 0, 0, 0));
gradient.AddColorStop (1, new Color (0, 0, 0, 1));
g.SetSource (new SurfacePattern (oldsurface));
g.Mask (gradient);
}
g.Restore ();
}