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To set the center point

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· By default, the center point of a path gradient brush is at the centroid of the path used to construct the brush. You can change the location of the center point by setting the CenterPoint property of the PathGradientBrush class.

The following example creates a path gradient brush based on an ellipse. The center of the ellipse is at (70, 35), but the center point of the path gradient brush is set to (120, 40).

// Create a path that consists of a single ellipse. GraphicsPath path = new GraphicsPath(); path.AddEllipse(0, 0, 140, 70); // Use the path to construct a brush. PathGradientBrush pthGrBrush = new PathGradientBrush(path); // Set the center point to a location that is not // the centroid of the path. pthGrBrush.CenterPoint = new PointF(120, 40); // Set the color at the center of the path to blue. pthGrBrush.CenterColor = Color.FromArgb(255, 0, 0, 255); // Set the color along the entire boundary // of the path to aqua. Color[] colors = { Color.FromArgb(255, 0, 255, 255) }; pthGrBrush.SurroundColors = colors; e.Graphics.FillEllipse(pthGrBrush, 0, 0, 140, 70);

The following illustration shows the filled ellipse and the center point of the path gradient brush.

· You can set the center point of a path gradient brush to a location outside the path that was used to construct the brush. The following example replaces the call to set the CenterPoint property in the preceding code.

pthGrBrush.CenterPoint = new PointF(145, 35);

· The following illustration shows the output with this change.

In the preceding illustration, the points at the far right of the ellipse are not pure blue (although they are very close). The colors in the gradient are positioned as if the fill reached the point (145, 35) where the color would be pure blue (0, 0, 255). But the fill never reaches (145, 35) because a path gradient brush paints only inside its path.

 
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