public static PdnGraphicsPath FromRegion(PdnRegion region)
{
Rectangle[] scans = region.GetRegionScansReadOnlyInt();
if (scans.Length == 1)
{
PdnGraphicsPath path = new PdnGraphicsPath();
path.AddRectangle(scans[0]);
path.CloseFigure();
return(path);
}
else
{
Rectangle bounds = region.GetBoundsInt();
BitVector2D stencil = new BitVector2D(bounds.Width, bounds.Height);
for (int i = 0; i < scans.Length; ++i)
{
Rectangle rect = scans[i];
rect.X -= bounds.X;
rect.Y -= bounds.Y;
stencil.SetUnchecked(rect, true);
}
PdnGraphicsPath path = PathFromStencil(stencil, new Rectangle(0, 0, stencil.Width, stencil.Height));
using (Matrix matrix = new Matrix())
{
matrix.Reset();
matrix.Translate(bounds.X, bounds.Y);
path.Transform(matrix);
}
return(path);
}
}
public static PdnGraphicsPath FromRegion(PdnRegion region)
{
Rectangle[] scans = region.GetRegionScansReadOnlyInt();
if (scans.Length == 1)
{
PdnGraphicsPath path = new PdnGraphicsPath();
path.AddRectangle(scans[0]);
path.CloseFigure();
return path;
}
else
{
Rectangle bounds = region.GetBoundsInt();
BitVector2D stencil = new BitVector2D(bounds.Width, bounds.Height);
for (int i = 0; i < scans.Length; ++i)
{
Rectangle rect = scans[i];
rect.X -= bounds.X;
rect.Y -= bounds.Y;
stencil.SetUnchecked(rect, true);
}
PdnGraphicsPath path = PathFromStencil(stencil, new Rectangle(0, 0, stencil.Width, stencil.Height));
using (Matrix matrix = new Matrix())
{
matrix.Reset();
matrix.Translate(bounds.X, bounds.Y);
path.Transform(matrix);
}
return path;
}
}
/// <summary>
/// Found on Google Groups when searching for "Region.Union" while looking
/// for bugs:
/// ---
/// Hello,
///
/// I did not run your code, but I know Region.Union is flawed in both 1.0 and
/// 1.1, so I assume it is in the gdi+ unmanged code dll. The best workaround,
/// in terms of speed, is to use a PdnGraphicsPath, but it must be a path with
/// FillMode = FillMode.Winding. You add the rectangles to the path, then you do
/// union onto an empty region with the path. The important point is to do only
/// one union call on a given empty region. We created a "super region" object
/// to hide all these bugs and optimize clipping operations. In fact, it is much
/// faster to use the path than to call Region.Union for each rectangle.
///
/// Too bad about Region.Union. A lot of people will hit this bug, as it is
/// essential in high-performance animation.
///
/// Regards,
/// Frank Hileman
/// Prodige Software Corporation
/// ---
/// </summary>
/// <param name="rectsF"></param>
/// <param name="startIndex"></param>
/// <param name="length"></param>
/// <returns></returns>
public static PdnRegion RectanglesToRegion(RectangleF[] rectsF, int startIndex, int length)
{
PdnRegion region;
if (rectsF == null || rectsF.Length == 0 || length == 0)
{
region = PdnRegion.CreateEmpty();
}
else
{
using (PdnGraphicsPath path = new PdnGraphicsPath())
{
path.FillMode = FillMode.Winding;
if (startIndex == 0 && length == rectsF.Length)
{
path.AddRectangles(rectsF);
}
else
{
for (int i = startIndex; i < startIndex + length; ++i)
{
path.AddRectangle(rectsF[i]);
}
}
region = new PdnRegion(path);
}
}
return region;
}
