Graphics::IsVisible Method (Single, Single)
Indicates whether the point specified by a pair of coordinates is contained within the visible clip region of this Graphics.
Assembly: System.Drawing (in System.Drawing.dll)
Parameters
- x
- Type: System::Single
The x-coordinate of the point to test for visibility.
- y
- Type: System::Single
The y-coordinate of the point to test for visibility.
Return Value
Type: System::Booleantrue if the point defined by the x and y parameters 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 PaintEventArgs e, 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.
public: void IsVisibleFloat( 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; // If point is visible, fill ellipse that represents it. if ( e->Graphics->IsVisible( x1, y1 ) ) { e->Graphics->FillEllipse( gcnew SolidBrush( Color::Red ), x1, y1, 10.0F, 10.0F ); } if ( e->Graphics->IsVisible( x2, y2 ) ) { e->Graphics->FillEllipse( gcnew SolidBrush( Color::Blue ), x2, y2, 10.0F, 10.0F ); } }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.