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();
}
//---------------------------------------------------------------------
private static void Gradient()
{
Action <Surface> draw = surface =>
{
using (var c = new Context(surface))
{
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);
c.Rectangle(0, 0, 256, 256);
c.SetSource(pat);
c.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);
c.SetSource(pat);
c.Arc(128.0, 128.0, 76.8, 0, 2 * Math.PI);
c.Fill();
pat.Dispose();
}
};
using (Surface surface = new ImageSurface(Format.Argb32, 500, 500))
{
draw(surface);
surface.WriteToPng("gradient.png");
}
using (Surface surface = new PdfSurface("gradient.pdf", 500, 500))
{
draw(surface);
surface.WriteToPng("gradient1.png");
}
using (Surface surface = new SvgSurface("gradient.svg", 500, 500))
{
draw(surface);
surface.WriteToPng("gradient2.png");
}
}