Graphics::IsVisible Method (PointF)
Indicates whether the specified PointF structure is contained within the visible clip region of this Graphics.
Assembly: System.Drawing (in System.Drawing.dll)
Parameters
- point
-
Type:
System.Drawing::PointF
PointF structure to test for visibility.
Return Value
Type: System::Booleantrue 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 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.
public: void IsVisiblePointF( 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. float x1 = 100.0F; float y1 = 100.0F; float x2 = 200.0F; float y2 = 200.0F; PointF point1 = PointF(x1,y1); PointF point2 = PointF(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, 10.0F, 10.0F ); } if ( e->Graphics->IsVisible( point2 ) ) { e->Graphics->FillEllipse( gcnew SolidBrush( Color::Blue ), x2, y2, 10.0F, 10.0F ); } }
Available since 1.1