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Graphics.FillClosedCurve Method (Brush, PointF[], FillMode, Single)

Fills the interior of a closed cardinal spline curve defined by an array of PointF structures using the specified fill mode and tension.

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

public void FillClosedCurve(
	Brush brush,
	PointF[] points,
	FillMode fillmode,
	float tension


Type: System.Drawing.Brush
A Brush that determines the characteristics of the fill.
Type: System.Drawing.PointF[]
Array of PointF structures that define the spline.
Type: System.Drawing.Drawing2D.FillMode
Member of the FillMode enumeration that determines how the curve is filled.
Type: System.Single
Value greater than or equal to 0.0F that specifies the tension of the curve.


brush is null.


points is null.

This method fills the interior of a closed cardinal spline that passes through each point in the array. If the last point does not match the first point, an additional curve segment is added from the last point to the first point to close it.

The array of points must contain at least four Point structures.

The tension parameter determines the shape of the spline. If the value of the tension parameter is 0.0F, this method draws straight line segments to connect the points. Usually, the tension parameter is less than or equal to 1.0F. Values over 1.0F produce unusual results.

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 solid red brush.

  • Creates an array of four points to define a spline.

  • Sets the fill mode to Winding.

  • Sets the tension to 1.0.

  • Fills the curve on the screen.

public void FillClosedCurvePointFFillModeTension(PaintEventArgs e)

    // Create solid brush.
    SolidBrush redBrush = new SolidBrush(Color.Red);

    // Create array of points for curve.
    PointF point1 = new PointF(100.0F, 100.0F);
    PointF point2 = new PointF(200.0F,  50.0F);
    PointF point3 = new PointF(250.0F, 200.0F);
    PointF point4 = new PointF(50.0F, 150.0F);
    PointF[] points = {point1, point2, point3, point4};

    // Set fill mode.
    FillMode newFillMode = FillMode.Winding;

    // Set tension.
    float tension = 1.0F;

    // Fill curve on screen.
    e.Graphics.FillClosedCurve(redBrush, points, newFillMode, tension);

.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.

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