GraphicsPath.Reverse 方法

定义

命名空间:

System.Drawing.Drawing2D

程序集:

System.Drawing.Common.dll

包:

System.Drawing.Common v9.0.0-preview.6.24327.6

Source:

GraphicsPath.cs

反转此 GraphicsPathPathPoints 数组中点的顺序。

public:
 void Reverse();

public void Reverse ();

member this.Reverse : unit -> unit

Public Sub Reverse ()

示例

下面的代码示例旨在与 Windows 窗体一起使用，它需要 PaintEventArgseOnPaint 事件对象。 该代码执行以下操作：

• 创建一个路径，并将多个基元添加到路径。

• 将路径的点数组绘制到屏幕。

• 将反向点数组绘制到屏幕。

请注意，第二个点列表与第一个列表相反。

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