/// <summary>
/// Draws a gradient around the specified polygon. Fades from 'inner' to 'outer' over a distance of 'width' pixels.
/// </summary>
/// <param name="g"></param>
/// <param name="poly"></param>
/// <param name="inner"></param>
/// <param name="outer"></param>
/// <param name="width"></param>
public static void DrawOuterGradient(Graphics g, PointF[] poly, Color inner, Color outer, float width)
{
PointF[,] corners = PolygonMath.GetCorners(poly, width);
PointF[,] sides = PolygonMath.GetSides(poly, width);
//Overlapping these causes darker areas... Don't use InflatePoly
//Paint corners
for (int i = 0; i <= corners.GetUpperBound(0); i++)
{
PointF[] pts = PolygonMath.GetSubArray(corners, i);
using (Brush b = PolygonMath.GenerateRadialBrush(inner, outer, pts[0], width + 1)) {
g.FillPolygon(b, pts);
}
}
//Paint sides
for (int i = 0; i <= sides.GetUpperBound(0); i++)
{
PointF[] pts = PolygonMath.GetSubArray(sides, i);
using (LinearGradientBrush b = new LinearGradientBrush(pts[3], pts[0], inner, outer)) {
b.SetSigmaBellShape(1);
b.WrapMode = WrapMode.TileFlipXY;
g.FillPolygon(b, pts);
}
}
}