Graphics::IsVisible Method (Point)


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Indicates whether the specified Point structure is contained within the visible clip region of this Graphics.

Namespace:   System.Drawing
Assembly:  System.Drawing (in System.Drawing.dll)

bool IsVisible(
	Point point


Type: System.Drawing::Point

Point structure to test for visibility.

Return Value

Type: System::Boolean

true if the point specified by the point parameter is contained within the visible clip region of this Graphics; otherwise, false.

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 rectangular clipping region and sets it as the clipping region for the graphics object of the form using Replace.

  • Creates two points, one inside the clipping region and one outside.

  • Tests each of the points for visibility and draws only the visible one.

The result is one small red circle, which is within the clip region.

   void IsVisiblePoint( PaintEventArgs^ e )
      // Set clip region.
      System::Drawing::Region^ clipRegion = gcnew System::Drawing::Region( Rectangle(50,50,100,100) );
      e->Graphics->SetClip( clipRegion, CombineMode::Replace );

      // Set up coordinates of points.
      int x1 = 100;
      int y1 = 100;
      int x2 = 200;
      int y2 = 200;
      Point point1 = Point(x1,y1);
      Point point2 = Point(x2,y2);

      // If point is visible, fill ellipse that represents it.
      if ( e->Graphics->IsVisible( point1 ) )
         e->Graphics->FillEllipse( gcnew SolidBrush( Color::Red ), x1, y1, 10, 10 );

      if ( e->Graphics->IsVisible( point2 ) )
         e->Graphics->FillEllipse( gcnew SolidBrush( Color::Blue ), x2, y2, 10, 10 );

.NET Framework
Available since 1.1
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