Graphics.IsVisible Method (Int32, Int32)
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.Int32
The x-coordinate of the point to test for visibility.
- y
-
Type:
System.Int32
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 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.
Private Sub IsVisibleInt(ByVal e As PaintEventArgs) ' Set clip region. Dim clipRegion As New [Region](New Rectangle(50, 50, 100, 100)) e.Graphics.SetClip(clipRegion, CombineMode.Replace) ' Set up coordinates of points. Dim x1 As Integer = 100 Dim y1 As Integer = 100 Dim x2 As Integer = 200 Dim y2 As Integer = 200 ' If point is visible, fill ellipse that represents it. If e.Graphics.IsVisible(x1, y1) Then e.Graphics.FillEllipse(New SolidBrush(Color.Red), x1, y1, _ 10, 10) End If If e.Graphics.IsVisible(x2, y2) Then e.Graphics.FillEllipse(New SolidBrush(Color.Blue), x2, y2, _ 10, 10) End If End Sub
Available since 1.1