Region::Union(constRect&) method (gdiplusheaders.h)

Article
02/22/2024

The Region::Union method updates this region to all portions (intersecting and nonintersecting) of itself and all portions of the specified rectangle's interior.

Syntax

Status Union(
  const Rect & rect
);

Parameters

rect

Reference to a rectangle to use to update this region.

Return value

Type: Status

If the method succeeds, it returns Ok, which is an element of the Status enumeration.

If the method fails, it returns one of the other elements of the Status enumeration.

Remarks

Examples

The following example creates a region from a path and then uses a rectangle to update the region. The updated region is the union of the path region and a rectangle.

VOID Example_UnionRect(HDC hdc)
{
   Graphics graphics(hdc);

   Point points[] = {
      Point(110, 20),
      Point(120, 30),
      Point(100, 60),
      Point(120, 70),
      Point(150, 60),
      Point(140, 10)};

   Rect rect(65, 15, 70, 45);
   GraphicsPath path;
   SolidBrush solidBrush(Color(255, 255, 0, 0));

   path.AddClosedCurve(points, 6);

   // Create a region from a path.
   Region pathRegion(&path);

   // Form the union of the region and a rectangle.
   pathRegion.Union(rect);

   graphics.FillRegion(&solidBrush, &pathRegion);
}

Requirements

Requirement	Value
Header	gdiplusheaders.h

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