Matrix.RotateAt 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

通过预先计算旋转，沿指定点顺时针旋转该 Matrix。

重载

RotateAt(Single, PointF)	沿 point 参数中指定的点并通过预先计算该旋转，来顺时针旋转此 Matrix。
RotateAt(Single, PointF, MatrixOrder)	按指定的顺序，沿指定点顺时针旋转该 Matrix。

RotateAt(Single, PointF)

Source:

Matrix.cs

沿 point 参数中指定的点并通过预先计算该旋转，来顺时针旋转此 Matrix。

public:
 void RotateAt(float angle, System::Drawing::PointF point);

public void RotateAt (float angle, System.Drawing.PointF point);

member this.RotateAt : single * System.Drawing.PointF -> unit

Public Sub RotateAt (angle As Single, point As PointF)

参数

angle

Single

旋转角度（范围）（单位：度）。

point

PointF

一个 PointF，表示旋转中心。

示例

下面的代码示例演示如何使用 Matrix 和 Transform 方法来旋转字符串。 此示例旨在与 Windows 窗体 一起使用。 Create窗体，并将以下代码粘贴到窗体中。 DrawVerticalStringFromBottomUp在窗体的Paint事件处理程序中调用 方法，作为 ePaintEventArgs传递。

private:
   void DrawVerticalStringFromBottomUp( PaintEventArgs^ e )
   {
      // Create the string to draw on the form.
      String^ text = "Can you read this?";

      // Create a GraphicsPath.
      System::Drawing::Drawing2D::GraphicsPath^ path = gcnew System::Drawing::Drawing2D::GraphicsPath;

      // Add the string to the path; declare the font, font style, size, and
      // vertical format for the string.
      path->AddString( text, this->Font->FontFamily, 1, 15, PointF(0.0F,0.0F), gcnew StringFormat( StringFormatFlags::DirectionVertical ) );

      // Declare a matrix that will be used to rotate the text.
      System::Drawing::Drawing2D::Matrix^ rotateMatrix = gcnew System::Drawing::Drawing2D::Matrix;

      // Set the rotation angle and starting point for the text.
      rotateMatrix->RotateAt( 180.0F, PointF(10.0F,100.0F) );

      // Transform the text with the matrix.
      path->Transform(rotateMatrix);

      // Set the SmoothingMode to high quality for best readability.
      e->Graphics->SmoothingMode = System::Drawing::Drawing2D::SmoothingMode::HighQuality;

      // Fill in the path to draw the string.
      e->Graphics->FillPath( Brushes::Red, path );

      // Dispose of the path.
      delete path;
   }

public void DrawVerticalStringFromBottomUp(PaintEventArgs e)
{

    // Create the string to draw on the form.
    string text = "Can you read this?";

    // Create a GraphicsPath.
    System.Drawing.Drawing2D.GraphicsPath path = 
        new System.Drawing.Drawing2D.GraphicsPath();

    // Add the string to the path; declare the font, font style, size, and
    // vertical format for the string.
    path.AddString(text, this.Font.FontFamily, 1, 15, 
        new PointF(0.0F, 0.0F), 
        new StringFormat(StringFormatFlags.DirectionVertical));

    // Declare a matrix that will be used to rotate the text.
    System.Drawing.Drawing2D.Matrix rotateMatrix = 
        new System.Drawing.Drawing2D.Matrix();

    // Set the rotation angle and starting point for the text.
    rotateMatrix.RotateAt(180.0F, new PointF(10.0F, 100.0F));

    // Transform the text with the matrix.
    path.Transform(rotateMatrix);

    // Set the SmoothingMode to high quality for best readability.
    e.Graphics.SmoothingMode = 
        System.Drawing.Drawing2D.SmoothingMode.HighQuality;

    // Fill in the path to draw the string.
    e.Graphics.FillPath(Brushes.Red, path);

    // Dispose of the path.
    path.Dispose();
}

Public Sub DrawVerticalStringFromBottomUp(ByVal e As PaintEventArgs)

    ' Create the string to draw on the form.
    Dim text As String = "Can you read this?"

    ' Create a GraphicsPath.
    Dim path As New System.Drawing.Drawing2D.GraphicsPath

    ' Add the string to the path; declare the font, font style, size, and
    ' vertical format for the string.
    path.AddString(text, Me.Font.FontFamily, 1, 15, New PointF(0.0F, 0.0F), _
        New StringFormat(StringFormatFlags.DirectionVertical))

    ' Declare a matrix that will be used to rotate the text.
    Dim rotateMatrix As New System.Drawing.Drawing2D.Matrix

    ' Set the rotation angle and starting point for the text.
    rotateMatrix.RotateAt(180.0F, New PointF(10.0F, 100.0F))

    ' Transform the text with the matrix.
    path.Transform(rotateMatrix)

    ' Set the SmoothingMode to high quality for best readability.
    e.Graphics.SmoothingMode = Drawing2D.SmoothingMode.HighQuality

    ' Fill in the path to draw the string.
    e.Graphics.FillPath(Brushes.Red, path)

    ' Dispose of the path.
    path.Dispose()

End Sub

RotateAt(Single, PointF, MatrixOrder)

Source:

Matrix.cs

按指定的顺序，沿指定点顺时针旋转该 Matrix。

public:
 void RotateAt(float angle, System::Drawing::PointF point, System::Drawing::Drawing2D::MatrixOrder order);

public void RotateAt (float angle, System.Drawing.PointF point, System.Drawing.Drawing2D.MatrixOrder order);

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

Public Sub RotateAt (angle As Single, point As PointF, order As MatrixOrder)

参数

angle

Single

旋转的角度（单位：度）。

point

PointF

一个 PointF，表示旋转中心。

order

MatrixOrder

一个 MatrixOrder，它指定旋转的顺序（追加或预先计算）。

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Paint对象。 此代码执行以下操作：

• 在 (蓝色矩形) 应用旋转转换之前，将矩形绘制到屏幕。

• 创建一个矩阵，并围绕指定点旋转 45 度。

• 将此矩阵转换应用于矩形。

• 将转换后的矩形绘制到屏幕 (红色矩形) 。

请注意，红色矩形已围绕矩形的左上角旋转， (指定 RotateAt 方法的旋转点) 。

public:
   void RotateAtExample( PaintEventArgs^ e )
   {
      Pen^ myPen = gcnew Pen( Color::Blue,1.0f );
      Pen^ myPen2 = gcnew Pen( Color::Red,1.0f );
      PointF rotatePoint = PointF(150.0f,50.0f);

      // Draw the rectangle to the screen before applying the
      // transform.
      e->Graphics->DrawRectangle( myPen, 150, 50, 200, 100 );

      // Create a matrix and rotate it 45 degrees.
      Matrix^ myMatrix = gcnew Matrix;
      myMatrix->RotateAt( 45, rotatePoint, MatrixOrder::Append );

      // Draw the rectangle to the screen again after applying the
      // transform.
      e->Graphics->Transform = myMatrix;
      e->Graphics->DrawRectangle( myPen2, 150, 50, 200, 100 );
   }

public void RotateAtExample(PaintEventArgs e)
{
    Pen myPen = new Pen(Color.Blue, 1);
    Pen myPen2 = new Pen(Color.Red, 1);
    PointF rotatePoint = new PointF(150.0f, 50.0f);
             
    // Draw the rectangle to the screen before applying the
    // transform.
    e.Graphics.DrawRectangle(myPen, 150, 50, 200, 100);
             
    // Create a matrix and rotate it 45 degrees.
    Matrix myMatrix = new Matrix();
    myMatrix.RotateAt(45, rotatePoint, MatrixOrder.Append);
             
    // Draw the rectangle to the screen again after applying the
    // transform.
    e.Graphics.Transform = myMatrix;
    e.Graphics.DrawRectangle(myPen2, 150, 50, 200, 100);
}

Public Sub RotateAtExample(ByVal e As PaintEventArgs)
    Dim myPen As New Pen(Color.Blue, 1)
    Dim myPen2 As New Pen(Color.Red, 1)
    Dim rotatePoint As New PointF(150.0F, 50.0F)

    ' Draw the rectangle to the screen before applying the
    ' transform.
    e.Graphics.DrawRectangle(myPen, 150, 50, 200, 100)

    ' Create a matrix and rotate it 45 degrees.
    Dim myMatrix As New Matrix
    myMatrix.RotateAt(45, rotatePoint, MatrixOrder.Append)

    ' Draw the rectangle to the screen again after applying the
    ' transform.
    e.Graphics.Transform = myMatrix
    e.Graphics.DrawRectangle(myPen2, 150, 50, 200, 100)
End Sub