Silverlight 引路蜂二维图形库示例:坐标变换

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类AffineTransform用于二维平面上坐标变换。可以对坐标进行平移,缩放,旋转等变换。下面例子显示了坐标变换的用法。

private void Transform(){ Path path;  /* The first matrix */ AffineTransform matrix1 = new AffineTransform(); /* The second matrix */ AffineTransform matrix2 = new AffineTransform(); /* The third matrix */ AffineTransform matrix3 = new AffineTransform();  /** Colors */ Color blackColor = new Color(0xff000000, false); Color redColor = new Color(0xffff0000, false); Color greenColor = new Color(0xff00ff00, false); Color blueColor = new Color(0xff0000ff, false); Color fillColor = new Color(0x4f0000ff, true); /* Define the path */ path = new Path(); path.MoveTo(50, 0); path.LineTo(0, 0); path.LineTo(0, 50);  /* Define the matrix1 as  "translate(50,50)"  */ matrix1.Translate(50, 50);  /* Define the matrix2 as "translate(50,50) + rotate(-45)" */ matrix2 = new AffineTransform(matrix1); AffineTransform m = new AffineTransform();  m.Rotate(-45 * Math.PI / 180.0, 0, 0); /* Concatenates the m  to the matrix2.  * [matrix2] =  [matrix2] * [m];  */ matrix2.Concatenate(m);  /* Define the matrix3 as  * "translate(50,50) + rotate(-45) + translate(-20,80)"  */ /* Copy the matrix2 to the matrix3 */ matrix3 = new AffineTransform(matrix2); m = new AffineTransform();  m.Translate(-20, 80); /* Concatenates the m  to the matrix3.  * [matrix3] =  [matrix3] * [m]  */ matrix3.Concatenate(m); //Clear the canvas with white color. graphics2D.Clear(Color.White);  graphics2D.AffineTransform = (matrix1); SolidBrush brush = new SolidBrush(fillColor); Pen pen = new Pen(redColor, 4);  graphics2D.SetPenAndBrush(pen, brush); graphics2D.Draw(null, path);  graphics2D.AffineTransform = (matrix2);  pen = new Pen(greenColor, 4);  graphics2D.SetPenAndBrush(pen, brush); graphics2D.Draw(null, path); graphics2D.AffineTransform = (matrix3);  pen = new Pen(blueColor, 4);  graphics2D.SetPenAndBrush(pen, brush); graphics2D.Draw(null, path); }


private void Transform()
{
 Path path;
 
 /* The first matrix */
 AffineTransform matrix1 = new AffineTransform();
 /* The second matrix */
 AffineTransform matrix2 = new AffineTransform();
 /* The third matrix */
 AffineTransform matrix3 = new AffineTransform();
 
 /** Colors */
 Color blackColor = new Color(0xff000000, false);
 Color redColor = new Color(0xffff0000, false);
 Color greenColor = new Color(0xff00ff00, false);
 Color blueColor = new Color(0xff0000ff, false);
 Color fillColor = new Color(0x4f0000ff, true);
 /* Define the path */
 path = new Path();
 path.MoveTo(50, 0);
 path.LineTo(0, 0);
 path.LineTo(0, 50);
 
 /* Define the matrix1 as  "translate(50,50)"  */
 matrix1.Translate(50, 50);
 
 /* Define the matrix2 as "translate(50,50) + rotate(-45)" */
 matrix2 = new AffineTransform(matrix1);
 AffineTransform m = new AffineTransform();
 
 m.Rotate(-45 * Math.PI / 180.0, 0, 0);
 /* Concatenates the m  to the matrix2.
  * [matrix2] =  [matrix2] * [m];
  */
 matrix2.Concatenate(m);
 
 /* Define the matrix3 as
  * "translate(50,50) + rotate(-45) + translate(-20,80)"  */
 /* Copy the matrix2 to the matrix3 */
 matrix3 = new AffineTransform(matrix2);
 m = new AffineTransform();
 
 m.Translate(-20, 80);
 /* Concatenates the m  to the matrix3.
  * [matrix3] =  [matrix3] * [m]
  */
 matrix3.Concatenate(m);
 //Clear the canvas with white color.
 graphics2D.Clear(Color.White);
 
 graphics2D.AffineTransform = (matrix1);
 SolidBrush brush = new SolidBrush(fillColor);
 Pen pen = new Pen(redColor, 4);
 
 graphics2D.SetPenAndBrush(pen, brush);
 graphics2D.Draw(null, path);
 
 graphics2D.AffineTransform = (matrix2);
 
 pen = new Pen(greenColor, 4);
 
 graphics2D.SetPenAndBrush(pen, brush);
 graphics2D.Draw(null, path);
 graphics2D.AffineTransform = (matrix3);
 
 pen = new Pen(blueColor, 4);
 
 graphics2D.SetPenAndBrush(pen, brush);
 graphics2D.Draw(null, path);
 
}

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