PathGradientBrush.RotateTransform 方法

定義

命名空間:

System.Drawing.Drawing2D

組件:

System.Drawing.Common.dll

套件:

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

將指定角度的順時針旋轉套用至局部幾何轉換。

多載

RotateTransform(Single)	依指定的量旋轉局部幾何轉換。 這個方法會在轉換之前加上旋轉。
RotateTransform(Single, MatrixOrder)	依指定的順序，依指定的數量旋轉局部幾何轉換。

RotateTransform(Single)

來源:

PathGradientBrush.cs

依指定的量旋轉局部幾何轉換。 這個方法會在轉換之前加上旋轉。

public:
 void RotateTransform(float angle);

public void RotateTransform (float angle);

member this.RotateTransform : single -> unit

Public Sub RotateTransform (angle As Single)

參數

angle

Single

旋轉的角度（範圍）。

範例

如需範例，請參閱 RotateTransform。

RotateTransform(Single, MatrixOrder)

來源:

PathGradientBrush.cs

依指定的順序，依指定的數量旋轉局部幾何轉換。

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)

參數

angle

Single

旋轉的角度（範圍）。

order

MatrixOrder

MatrixOrder，指定要附加或加上旋轉矩陣之前。

範例

下列程式代碼範例的設計目的是要與 Windows Forms 搭配使用，而且需要 PaintEventArgseOnPaint 事件物件。 程式代碼會執行下列動作：

• 建立圖形路徑，並將矩形加入其中。

• 從路徑點建立 PathGradientBrush（在此範例中，這些點會形成矩形，但可能是大部分的圖形）。

• 將中央色彩設定為紅色，並將周圍色彩設定為藍色。

• 在套用旋轉轉換之前，先將 PathGradientBrush 繪製到畫面。

• 使用其 RotateTransform 方法，將旋轉轉換套用至筆刷。

• 將旋轉筆刷 （矩形） 繪製到螢幕。

請注意，與平移前繪製的矩形相比，底部矩形會旋轉 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