GraphicsPath.Flatten Method (Matrix, Single)

Converts each curve in this GraphicsPath into a sequence of connected line segments.

Namespace: System.Drawing.Drawing2D
Assembly: System.Drawing (in system.drawing.dll)

public void Flatten (
	Matrix matrix,
	float flatness
)
public void Flatten (
	Matrix matrix, 
	float flatness
)
public function Flatten (
	matrix : Matrix, 
	flatness : float
)
Not applicable.

Parameters

matrix

A Matrix by which to transform this GraphicsPath before flattening.

flatness

Specifies the maximum permitted error between the curve and its flattened approximation. A value of 0.25 is the default. Reducing the flatness value will increase the number of line segments in the approximation.

The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, an OnPaint event object. The code performs the following actions:

  • Creates a graphics path and a translation matrix.

  • Adds a curve to the path using four points.

  • Draws the path (curve) to the screen, using a black pen.

  • Shifts the curve down 10 pixels and flattens it.

  • Draws the curve to the screen using, a red pen.

Notice that the red curve has flattened lines connecting the points.

private void FlattenExample(PaintEventArgs e)
{
    GraphicsPath myPath = new GraphicsPath();
    Matrix translateMatrix = new Matrix();
    translateMatrix.Translate(0, 10);
    Point point1 = new Point(20, 100);
    Point point2 = new Point(70, 10);
    Point point3 = new Point(130, 200);
    Point point4 = new Point(180, 100);
    Point[] points = {point1, point2, point3, point4};
    myPath.AddCurve(points);
    e.Graphics.DrawPath(new Pen(Color.Black, 2), myPath);
    myPath.Flatten(translateMatrix, 10f);
    e.Graphics.DrawPath(new Pen(Color.Red, 1), myPath);
}

private void FlattenExample(PaintEventArgs e)
{
    GraphicsPath myPath = new GraphicsPath();
    Matrix translateMatrix = new Matrix();

    translateMatrix.Translate(0, 10);

    Point point1 = new Point(20, 100);
    Point point2 = new Point(70, 10);
    Point point3 = new Point(130, 200);
    Point point4 = new Point(180, 100);
    Point points[] =  { point1, point2, point3, point4 };

    myPath.AddCurve(points);
    e.get_Graphics().DrawPath(new Pen(Color.get_Black(), 2), myPath);
    myPath.Flatten(translateMatrix, 10);
    e.get_Graphics().DrawPath(new Pen(Color.get_Red(), 1), myPath);
} //FlattenExample

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0
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