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Graphics.IsVisible Method (Int32, Int32, Int32, Int32)

Indicates whether the rectangle specified by a pair of coordinates, a width, and a height is contained within the visible clip region of this Graphics.

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

public bool IsVisible(
	int x,
	int y,
	int width,
	int height


Type: System.Int32
The x-coordinate of the upper-left corner of the rectangle to test for visibility.
Type: System.Int32
The y-coordinate of the upper-left corner of the rectangle to test for visibility.
Type: System.Int32
Width of the rectangle to test for visibility.
Type: System.Int32
Height of the rectangle to test for visibility.

Return Value

Type: System.Boolean
true if the rectangle defined by the x, y, width, and height 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 the location and size of two rectangles, one inside the clipping region and one outside.

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

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

private void IsVisible4Int(PaintEventArgs e)

    // Set clip region.
    Region clipRegion = new Region(new Rectangle(50, 50, 100, 100));
    e.Graphics.SetClip(clipRegion, CombineMode.Replace);

    // Set up coordinates of rectangles.
    int x1 = 100;
    int y1 = 100;
    int width1 = 20;
    int height1 = 20;
    int x2 = 200;
    int y2 = 200;
    int width2 = 20;
    int height2 = 20;

    // If rectangle is visible, fill it.
    if (e.Graphics.IsVisible(x1, y1, width1, height1))
        e.Graphics.FillRectangle(new SolidBrush(Color.Red), x1, y1, width1, height1);
    if (e.Graphics.IsVisible(x2, y2, width2, height2))
        e.Graphics.FillRectangle(new SolidBrush(Color.Blue), x2, y2, width2, height2);

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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.