public static PdnRegion GetOutline(this PdnRegion region, RectangleF bounds, float scalefactor)
{
GraphicsPath path = new GraphicsPath();
PdnRegion region2 = region.Clone();
Matrix scalematrix = new Matrix(
bounds,
new PointF[] {
new PointF(bounds.Left, bounds.Top),
new PointF(bounds.Right * scalefactor, bounds.Top),
new PointF(bounds.Left, bounds.Bottom * scalefactor)
});
region2.Transform(scalematrix);
foreach (RectangleF rect in region2.GetRegionScans())
{
path.AddRectangle(RectangleF.Inflate(rect, 1, 1));
}
PdnRegion retval = new PdnRegion(path);
retval.Exclude(region2);
return(retval);
}
/// <summary>
/// Constructs an outline of the given region with the given bounds
/// and scaling factor.
/// </summary>
/// <param name="region">
/// The selection to approximate.
/// </param>
/// <param name="bounds">
/// The boundaries of the image.
/// </param>
/// <param name="scalingMultiplier">
/// The amount to scale the size of the outline by.
/// </param>
public static PdnRegion ConstructOutline(
this PdnRegion region,
RectangleF bounds,
float scalingMultiplier)
{
GraphicsPath path = new GraphicsPath();
PdnRegion newRegion = region.Clone();
//The size to scale the region by.
Matrix scalematrix = new Matrix(
bounds,
new PointF[] {
new PointF(bounds.Left, bounds.Top),
new PointF(bounds.Right * scalingMultiplier, bounds.Top),
new PointF(bounds.Left, bounds.Bottom * scalingMultiplier)
});
newRegion.Transform(scalematrix);
//Makes the new region slightly larger by inflating rectangles.
foreach (RectangleF rect in newRegion.GetRegionScans())
{
path.AddRectangle(RectangleF.Inflate(rect, 1, 1));
}
//Subtracts the old region, leaving an outline from the expansion.
PdnRegion result = new PdnRegion(path);
result.Exclude(newRegion);
return(result);
}
