Region::Complement Method (GraphicsPath^)
Updates this Region to contain the portion of the specified GraphicsPath that does not intersect with this Region.
Assembly: System.Drawing (in System.Drawing.dll)
Parameters
- path
-
Type:
System.Drawing.Drawing2D::GraphicsPath^
The GraphicsPath to complement this Region.
| Exception | Condition |
|---|---|
| ArgumentNullException | path is null. |
The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. The code performs the following actions:
Creates a rectangle and draws it to the screen in black.
Creates a second rectangle that intersects with the first and draws it to the screen in red.
Creates a region using the first rectangle.
Creates a GraphicsPath, and adds the second rectangle to it.
Gets the complement of the region when combined with the GraphicsPath.
Fills the complement area with blue and draws it to the screen.
Notice that the area of the GraphicsPath that does not intersect with the region is colored blue.
public: void Complement_Path_Example( PaintEventArgs^ e ) { // Create the first rectangle and draw it to the screen in black. Rectangle regionRect = Rectangle(20,20,100,100); e->Graphics->DrawRectangle( Pens::Black, regionRect ); // Create the second rectangle and draw it to the screen in red. Rectangle complementRect = Rectangle(90,30,100,100); e->Graphics->DrawRectangle( Pens::Red, complementRect ); // Create a graphics path and add the second rectangle to it. GraphicsPath^ complementPath = gcnew GraphicsPath; complementPath->AddRectangle( complementRect ); // Create a region using the first rectangle. System::Drawing::Region^ myRegion = gcnew System::Drawing::Region( regionRect ); // Get the complement of myRegion when combined with // complementPath. myRegion->Complement( complementPath ); // Fill the complement area with blue. SolidBrush^ myBrush = gcnew SolidBrush( Color::Blue ); e->Graphics->FillRegion( myBrush, myRegion ); }
Available since 1.1