GraphicsPath.Reverse 方法
定义
反转此 PathPoints 的 GraphicsPath 数组中各点的顺序。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 ()
示例
下面的代码示例旨在与 Windows 窗体一起使用,并且它需要 PaintEventArgs e 一个 OnPaint 事件对象。The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, an OnPaint event object. 此代码执行以下操作:The code performs the following actions:
创建路径并向路径添加几个基元。Creates a path and adds several primitives to the path.
将路径点数组绘制到屏幕上。Draws the path's points array to the screen.
将反转点数组绘制到屏幕上。Draws the reversed points array to the screen.
请注意,第二个点列表与第一个点列表顺序相反。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