PathGradientBrush.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

将指定角度的顺时针旋转应用到局部几何变换。

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:

PathGradientBrush.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（范围）。

示例

有关示例，请参见 RotateTransform。

RotateTransform(Single, MatrixOrder)

Source:

PathGradientBrush.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（范围）。

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。 此代码执行以下操作：

• 创建图形路径并向其中添加一个矩形。

• PathGradientBrush在此示例中，从路径点 (创建 ，这些点构成一个矩形，但它可以是大多数) 的任何形状。

• 将中心颜色设置为红色，将周围颜色设置为蓝色。

• PathGradientBrush在应用旋转转换之前将 绘制到屏幕。

• 使用 RotateTransform 画笔的 方法将旋转转换应用于画笔。

• 将旋转的画笔 (矩形) 绘制到屏幕上。

请注意，与平移前绘制的矩形相比，底部矩形旋转 45 度。

public:
   void RotateTransformExample( PaintEventArgs^ e )
   {
      // Create a graphics path and add an ellipse.
      GraphicsPath^ myPath = gcnew GraphicsPath;
      Rectangle rect = Rectangle(100,20,100,50);
      myPath->AddRectangle( rect );

      // Get the path's array of points.
      array<PointF>^myPathPointArray = myPath->PathPoints;

      // Create a path gradient brush.
      PathGradientBrush^ myPGBrush = gcnew PathGradientBrush( myPathPointArray );

      // Set the color span.
      myPGBrush->CenterColor = Color::Red;
      array<Color>^ mySurroundColor = {Color::Blue};
      myPGBrush->SurroundColors = mySurroundColor;

      // Draw the brush to the screen prior to transformation.
      e->Graphics->FillRectangle( myPGBrush, 10, 10, 200, 200 );

      // Apply the rotate transform to the brush.
      myPGBrush->RotateTransform( 45, MatrixOrder::Append );

      // Draw the brush to the screen again after applying the
      // transform.
      e->Graphics->FillRectangle( myPGBrush, 10, 10, 200, 300 );
   }

public void RotateTransformExample(PaintEventArgs e)
{
             
    // Create a graphics path and add an ellipse.
    GraphicsPath myPath = new GraphicsPath();
    Rectangle rect = new Rectangle(100, 20, 100, 50);
    myPath.AddRectangle(rect);
             
    // Get the path's array of points.
    PointF[] myPathPointArray = myPath.PathPoints;
             
    // Create a path gradient brush.
    PathGradientBrush myPGBrush = new
        PathGradientBrush(myPathPointArray);
             
    // Set the color span.
    myPGBrush.CenterColor = Color.Red;
    Color[] mySurroundColor = {Color.Blue};
    myPGBrush.SurroundColors = mySurroundColor;
             
    // Draw the brush to the screen prior to transformation.
    e.Graphics.FillRectangle(myPGBrush, 10, 10, 200, 200);
             
    // Apply the rotate transform to the brush.
    myPGBrush.RotateTransform(45, MatrixOrder.Append);
             
    // Draw the brush to the screen again after applying the
    // transform.
    e.Graphics.FillRectangle(myPGBrush, 10, 10, 200, 300);
}

Public Sub RotateTransformExample(ByVal e As PaintEventArgs)

    ' Create a graphics path and add a rectangle.
    Dim myPath As New GraphicsPath
    Dim rect As New Rectangle(100, 20, 100, 50)
    myPath.AddRectangle(rect)

    ' Get the path's array of points.
    Dim myPathPointArray As PointF() = myPath.PathPoints

    ' Create a path gradient brush.
    Dim myPGBrush As New PathGradientBrush(myPathPointArray)

    ' Set the color span.
    myPGBrush.CenterColor = Color.Red
    Dim mySurroundColor As Color() = {Color.Blue}
    myPGBrush.SurroundColors = mySurroundColor

    ' Draw the brush to the screen prior to transformation.
    e.Graphics.FillRectangle(myPGBrush, 10, 10, 200, 200)

    ' Apply the rotate transform to the brush.
    myPGBrush.RotateTransform(45, MatrixOrder.Append)

    ' Draw the brush to the screen again after applying the
    ' transform.
    e.Graphics.FillRectangle(myPGBrush, 10, 10, 200, 300)
End Sub