GraphicsPath.Reverse Method

Definition

Namespace:

System.Drawing.Drawing2D

Assembly:

System.Drawing.Common.dll

Reverses the order of points in the PathPoints array of this GraphicsPath.

public:
 void Reverse();

public void Reverse ();

member this.Reverse : unit -> unit

Public Sub Reverse ()

Examples

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

• Creates a path and adds several primitives to the path.

• Draws the path's points array to the screen.

• Draws the reversed points array to the screen.

Notice that the second listing of points is in reverse order from the first.

void GraphicsPathReverseExample( PaintEventArgs^ e )
{
   // Create a path and add a line, ellipse, and arc.
   GraphicsPath^ myPath = gcnew GraphicsPath;
   myPath->AddLine( Point(0,0), Point(100,100) );
   myPath->AddEllipse( 100, 100, 200, 250 );
   myPath->AddArc( 300, 250, 100, 100, 0, 90 );

   // Draw the first set of points to the screen.
   DrawPoints2( e, myPath->PathPoints, 20 );

   // Call GraphicsPath.Reverse.
   myPath->Reverse();

   // Draw the reversed set of points to the screen.
   DrawPoints2( e, myPath->PathPoints, 150 );
}

//End GraphicsPathReverseExample.
// A helper function GraphicsPathReverseExample is used to draw the
// points to the screen.
void DrawPoints2( PaintEventArgs^ e, array<PointF>^ pathPoints, int xOffset )
{
   int y = 20;
   System::Drawing::Font^ myFont = gcnew System::Drawing::Font( "Arial",8 );
   for ( int i = 0; i < pathPoints->Length; i++ )
   {
      e->Graphics->DrawString( String::Concat( pathPoints[ i ].X, ", ", pathPoints[ i ].Y ), myFont, Brushes::Black, (float)xOffset, (float)y );
      y += 20;

   }
}
// End DrawPoints

public void GraphicsPathReverseExample(PaintEventArgs e)
{
             
    // Create a path and add a line, ellipse, and arc.
    GraphicsPath myPath = new GraphicsPath();
    myPath.AddLine(new Point(0, 0), new Point(100, 100));
    myPath.AddEllipse(100, 100, 200, 250);
    myPath.AddArc(300, 250, 100, 100, 0, 90);
             
    // Draw the first set of points to the screen.
    DrawPoints2(e, myPath.PathPoints, 20);
             
    // Call GraphicsPath.Reverse.
    myPath.Reverse();
             
    // Draw the reversed set of points to the screen.
    DrawPoints2(e, myPath.PathPoints, 150);
}
//End GraphicsPathReverseExample.
             
// A helper function GraphicsPathReverseExample is used to draw the
             
// points to the screen.
public void DrawPoints2(PaintEventArgs e, PointF[] pathPoints, int xOffset)
{
    int y = 20;
    Font myFont = new Font("Arial", 8);
    for(int i=0;i < pathPoints.Length; i++)
    {
        e.Graphics.DrawString(pathPoints[i].X.ToString() + ", " +
            pathPoints[i].Y.ToString(),
            myFont,
            Brushes.Black,
            xOffset,
            y);
        y += 20;
    }
} 
// End DrawPoints

Public Sub GraphicsPathReverseExample(ByVal e As PaintEventArgs)

    ' Create a path and add a line, ellipse, and arc.
    Dim myPath As New GraphicsPath
    myPath.AddLine(New Point(0, 0), New Point(100, 100))
    myPath.AddEllipse(100, 100, 200, 250)
    myPath.AddArc(300, 250, 100, 100, 0, 90)

    ' Draw the first set of points to the screen.
    DrawPointsHelper2(e, myPath.PathPoints, 20)

    ' Call GraphicsPath.Reverse.
    myPath.Reverse()

    ' Draw the reversed set of points to the screen.
    DrawPointsHelper2(e, myPath.PathPoints, 150)
End Sub

' A helper function used by GraphicsPathReverseExample to draw points.
Public Sub DrawPointsHelper2(ByVal e As PaintEventArgs, _
ByVal pathPoints() As PointF, ByVal xOffset As Integer)
    Dim y As Integer = 20
    Dim myFont As New Font("Arial", 8)
    Dim i As Integer
    For i = 0 To pathPoints.Length - 1
        e.Graphics.DrawString(pathPoints(i).X.ToString() + _
        ", " + pathPoints(i).Y.ToString(), myFont, Brushes.Black, _
        xOffset, y)
        y += 20
    Next i
End Sub