LinearGradientBrush.RotateTransform 方法

定义

命名空间:

System.Drawing.Drawing2D

程序集:

System.Drawing.Common.dll

包:

System.Drawing.Common v8.0.0

将局部几何转换旋转指定大小。 此方法预先计算对转换的旋转。

重载

RotateTransform(Single)	将局部几何转换旋转指定大小。 此方法预先计算对转换的旋转。
RotateTransform(Single, MatrixOrder)	将局部几何转换以指定顺序旋转指定量。

RotateTransform(Single)

Source:

LinearGradientBrush.cs

将局部几何转换旋转指定大小。 此方法预先计算对转换的旋转。

public:
 void RotateTransform(float angle);

public void RotateTransform (float angle);

member this.RotateTransform : single -> unit

Public Sub RotateTransform (angle As Single)

参数

angle

Single

旋转角度。

示例

有关示例，请参见 RotateTransform。

RotateTransform(Single, MatrixOrder)

Source:

LinearGradientBrush.cs

将局部几何转换以指定顺序旋转指定量。

public:
 void RotateTransform(float angle, System::Drawing::Drawing2D::MatrixOrder order);

public void RotateTransform (float angle, System.Drawing.Drawing2D.MatrixOrder order);

member this.RotateTransform : single * System.Drawing.Drawing2D.MatrixOrder -> unit

Public Sub RotateTransform (angle As Single, order As MatrixOrder)

参数

angle

Single

旋转角度。

order

MatrixOrder

一个 MatrixOrder，它指定是在后面追加旋转矩阵还是在前面添加旋转矩阵。

示例

下面的代码示例旨在与 Windows 窗体 一起使用，它需要 PaintEventArgse事件OnPaint对象。 代码

• 创建一个新的 LinearGradientBrush。

• 使用此画笔在屏幕上绘制一个椭圆。

• LinearGradientBrush通过调用 RotateTransform 方法旋转 45 度。

• 使用旋转画笔将椭圆绘制到屏幕正下方的第一个椭圆。

请注意，下椭圆的渐变与上椭圆的 x 轴呈 45 度角。 另请注意，调用 TranslateTransform 方法用于使渐变填充的左边缘与下椭圆的左边缘对齐。

private:
   void RotateTransformExample( PaintEventArgs^ e )
   {
      // Create a LinearGradientBrush.
      Rectangle myRect = Rectangle(20,20,200,100);
      LinearGradientBrush^ myLGBrush = gcnew LinearGradientBrush( myRect,Color::Blue,Color::Red,0.0f,true );

      // Draw an ellipse to the screen using the LinearGradientBrush.
      e->Graphics->FillEllipse( myLGBrush, myRect );

      // Rotate the LinearGradientBrush.
      myLGBrush->RotateTransform( 45.0f, MatrixOrder::Prepend );

      // Rejustify the brush to start at the left edge of the ellipse.
      myLGBrush->TranslateTransform(  -100.0f, 0.0f );

      // Draw a second ellipse to the screen using
      // the transformed brush.
      e->Graphics->FillEllipse( myLGBrush, 20, 150, 200, 100 );
   }

 private void RotateTransformExample(PaintEventArgs e)
 {
              
     // Create a LinearGradientBrush.
     Rectangle myRect = new Rectangle(20, 20, 200, 100);
     LinearGradientBrush myLGBrush = new LinearGradientBrush(
         myRect, Color.Blue, Color.Red,  0.0f, true);
              
     // Draw an ellipse to the screen using the LinearGradientBrush.
     e.Graphics.FillEllipse(myLGBrush, myRect);
              
     // Rotate the LinearGradientBrush.
     myLGBrush.RotateTransform(45.0f, MatrixOrder.Prepend);

     // Rejustify the brush to start at the left edge of the ellipse.
     myLGBrush.TranslateTransform(-100.0f, 0.0f);
              
     // Draw a second ellipse to the screen using
     // the transformed brush.
     e.Graphics.FillEllipse(myLGBrush, 20, 150, 200, 100);
 }

Public Sub RotateTransformExample(ByVal e As PaintEventArgs)

    ' Create a LinearGradientBrush.
    Dim myRect As New Rectangle(20, 20, 200, 100)
    Dim myLGBrush As New LinearGradientBrush(myRect, Color.Blue, _
    Color.Red, 0.0F, True)

    ' Draw an ellipse to the screen using the LinearGradientBrush.
    e.Graphics.FillEllipse(myLGBrush, myRect)

    ' Rotate the LinearGradientBrush.
    myLGBrush.RotateTransform(45.0F, MatrixOrder.Prepend)

    ' Rejustify the brush to start at the left edge of the ellipse.
    myLGBrush.TranslateTransform(-100.0F, 0.0F)

    ' Draw a second ellipse to the screen using the transformed brush.
    e.Graphics.FillEllipse(myLGBrush, 20, 150, 200, 100)
End Sub