PathGradientBrush.MultiplyTransform 方法

定义

命名空间:

System.Drawing.Drawing2D

程序集:

System.Drawing.Common.dll

程序集:

System.Drawing.dll

通过预先计算指定的 Matrix，将表示此 PathGradientBrush 的局部几何转换的 Matrix 与指定的 Matrix 相乘。

重载

MultiplyTransform(Matrix)	通过画笔的变换矩阵与其他的矩阵相乘的乘积更新该画笔的变换矩阵。
MultiplyTransform(Matrix, MatrixOrder)	通过画笔的变换矩阵与其他的矩阵相乘的乘积更新该画笔的变换矩阵。

MultiplyTransform(Matrix)

通过画笔的变换矩阵与其他的矩阵相乘的乘积更新该画笔的变换矩阵。

public:
 void MultiplyTransform(System::Drawing::Drawing2D::Matrix ^ matrix);

public void MultiplyTransform (System.Drawing.Drawing2D.Matrix matrix);

member this.MultiplyTransform : System.Drawing.Drawing2D.Matrix -> unit

Public Sub MultiplyTransform (matrix As Matrix)

参数

matrix

Matrix

将与画笔的当前变换矩阵相乘的 Matrix。

示例

有关示例，请参见 MultiplyTransform。

MultiplyTransform(Matrix, MatrixOrder)

通过画笔的变换矩阵与其他的矩阵相乘的乘积更新该画笔的变换矩阵。

public:
 void MultiplyTransform(System::Drawing::Drawing2D::Matrix ^ matrix, System::Drawing::Drawing2D::MatrixOrder order);

public void MultiplyTransform (System.Drawing.Drawing2D.Matrix matrix, System.Drawing.Drawing2D.MatrixOrder order);

member this.MultiplyTransform : System.Drawing.Drawing2D.Matrix * System.Drawing.Drawing2D.MatrixOrder -> unit

Public Sub MultiplyTransform (matrix As Matrix, order As MatrixOrder)

参数

matrix

Matrix

将与画笔的当前变换矩阵相乘的 Matrix。

order

MatrixOrder

一个 MatrixOrder，它指定两个矩阵相乘的顺序。

示例

下面的代码示例设计用于Windows 窗体，并且需要PaintEventArgse一个OnPaint事件对象。 此代码执行以下操作：

• 创建图形路径并为其添加一个矩形。

• 从此示例中的路径点 (创建一个 PathGradientBrush 点，这些点构成一个矩形，但它可能是大多数形状) 。

• 将中心颜色设置为红色，将周围颜色设置为蓝色。

• 在应用乘法转换之前绘制 PathGradientBrush 到屏幕。

• 创建旋转画笔 90 度并将画笔在两个轴上旋转 100 的矩阵。

• 使用 MultiplyTransform 该方法将此矩阵应用于画笔。

• 将画笔绘制到屏幕。

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

      // Create a new matrix that rotates by 90 degrees, and
      // translates by 100 in each direction.
      Matrix^ myMatrix = gcnew Matrix( 0,1,-1,0,100,100 );

      // Apply the transform to the brush.
      myPGBrush->MultiplyTransform( myMatrix, MatrixOrder::Append );

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

public void MultiplyTransformExample(PaintEventArgs e)
{
             
    // Create a graphics path and add an rectangle.
    GraphicsPath myPath = new GraphicsPath();
    Rectangle rect = new Rectangle(20, 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);
             
    // Create a new matrix that rotates by 90 degrees, and
    // translates by 100 in each direction.
    Matrix myMatrix = new Matrix(0, 1, -1, 0, 100, 100);
             
    // Apply the transform to the brush.
    myPGBrush.MultiplyTransform(myMatrix, MatrixOrder.Append);
             
    // Draw the brush to the screen again after applying the
    // transform.
    e.Graphics.FillRectangle(myPGBrush, 10, 10, 200, 300);
}

Public Sub MultiplyTransformExample(ByVal e As PaintEventArgs)

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

    ' Create a new matrix that rotates by 90 degrees, and
    ' translates by 100 in each direction.
    Dim myMatrix As New Matrix(0, 1, -1, 0, 100, 100)

    ' Apply the transform to the brush.
    myPGBrush.MultiplyTransform(myMatrix, MatrixOrder.Append)

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