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


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

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

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


Type: System.Drawing.Brush

Brush that determines the characteristics of the fill.

Type: System.Drawing.Point[]

Array of Point 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.

Exception Condition

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 PaintEventArgse, 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 FillClosedCurvePointFillModeTension(PaintEventArgs e)

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

    // Create array of points for curve.
    Point point1 = new Point(100, 100);
    Point point2 = new Point(200,  50);
    Point point3 = new Point(250, 200);
    Point point4 = new Point(50, 150);
    Point[] 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
Available since 1.1
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