// Gradient Fills
public override void DrawGradientRectangle(GradientRect gRect)
{
BufferChunk chunk = new BufferChunk(1024);
chunk += GDI32.EMR_GRADIENTFILL;
// Pack the vertices
Pack(chunk, gRect.Vertices);
// Pack the gradient mesh
Pack(chunk, gRect.Boundary);
// pack the mode
chunk += (int)gRect.Direction;
PackCommand(chunk);
}
public static void GradientFill(Graphics graphics, Rectangle target,
Color startColor, Color endColor,
GradientDirection direction)
{
if (!GradientFillSupported)
{
return;
}
var hdc = graphics.GetHdc();
try
{
var vertices = new TriVertex[]
{
new TriVertex(target.Left, target.Top, startColor),
new TriVertex(target.Right, target.Bottom, endColor)
};
var rectangles = new GradientRect[]
{
new GradientRect()
{
UpperLeft = 0,
LowerRight = 1
}
};
GradientFill(hdc, vertices, 2, rectangles, 1,
direction == GradientDirection.Horizontal ?
GRADIENT_FILL_RECT_H : GRADIENT_FILL_RECT_V);
}
finally
{
graphics.ReleaseHdc(hdc);
}
}