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private Union ( |
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| a | ||
| b | ||
| return | ||
// Union of reg1 and reg2
public static void Union(Region reg1, Region reg2)
{
if (reg1 == reg2 | reg2.rects.Length == 0)
{
return;
}
if (reg1.rects.Length == 0)
{
reg1.rects = (RectangleF[])reg2.rects.Clone();
reg1.extent = reg2.extent;
return;
}
// Region 1 completely subsumes region 2
RectangleF reg1Extent = reg1.extent;
RectangleF reg2Extent = reg2.extent;
if (reg1.rects.Length == 1 && reg1Extent.Left <= reg2Extent.Left && reg1Extent.Top <= reg2Extent.Top && reg1Extent.Right >= reg2Extent.Right && reg1Extent.Bottom >= reg2Extent.Bottom)
{
return;
}
// Region 2 completely subsumes region 1
if (reg2.rects.Length == 1 && (reg2Extent.Left <= reg1Extent.Left) && reg2Extent.Top <= reg1Extent.Top && reg2Extent.Right >= reg1Extent.Right && reg2Extent.Bottom >= reg1Extent.Bottom)
{
reg1.rects = (RectangleF[])reg2.rects.Clone();
reg1.extent = reg2.extent;
return;
}
Region union = RegionOperation(reg1, reg2, RegionOperationType.Union);
reg1.rects = union.rects;
reg1.extent = RectangleF.Union(reg1.extent, reg2.extent);
}
