Silverlight 引路蜂二维图形库示例:坐标变换

概述类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

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(0,50);  /* 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); /* 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,path); graphics2D.Affinetransform = (matrix3);  pen = new Pen(bluecolor,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(0,50);
 
 /* 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);
 /* Concatenates the m  to the matrix2.
  * [matrix2] =  [matrix2] * [m];
  */
 matrix2.Concatenate(m);
 
 /* define the matrix3 as
  * "translate(50,80)"  */
 /* 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,path);
 graphics2D.Affinetransform = (matrix3);
 
 pen = new Pen(bluecolor,path);
 
}

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