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To customize with interpolation
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· Another way to customize a path gradient brush is to specify an array of interpolation colors and an array of interpolation positions.
The following example creates a path gradient brush based on a triangle. The code sets the InterpolationColors property of the path gradient brush to specify an array of interpolation colors (dark green, aqua, blue) and an array of interpolation positions (0, 0.25, 1). As you move from the boundary of the triangle to the center point, the color changes gradually from dark green to aqua and then from aqua to blue. The change from dark green to aqua happens in 25 percent of the distance from dark green to blue.
The following illustration shows the triangle filled with the custom path gradient brush.
| // Vertices of the outer triangle Point[] points = { new Point(100, 0), new Point(200, 200), new Point(0, 200)}; // No GraphicsPath object is created. The PathGradientBrush // object is constructed directly from the array of points. PathGradientBrush pthGrBrush = new PathGradientBrush(points); Color[] colors = { Color.FromArgb(255, 0, 128, 0), // dark green Color.FromArgb(255, 0, 255, 255), // aqua Color.FromArgb(255, 0, 0, 255)}; // blue float[] relativePositions = { 0f, // Dark green is at the boundary of the triangle. 0.4f, // Aqua is 40 percent of the way from the boundary // to the center point. 1.0f}; // Blue is at the center point. ColorBlend colorBlend = new ColorBlend(); colorBlend.Colors = colors; colorBlend.Positions = relativePositions; pthGrBrush.InterpolationColors = colorBlend; // Fill a rectangle that is larger than the triangle // specified in the Point array. The portion of the // rectangle outside the triangle will not be painted. e.Graphics.FillRectangle(pthGrBrush, 0, 0, 200, 200); |
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