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<DIV class=newsmallbox>Windows GDI和GDI+编程实例剖析 </DIV>
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<DIV class=newtitle1>作者： 宋宝华 </DIV>
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<DIV class=guanggao><SPAN 
id=contentAdv></SPAN></DIV>　　<STRONG>持久的路径对象<BR></STRONG><BR>　　在GDI中，路径隶属于一个设备上下文，一旦设备环境指针超过它的生存期，路径也会被删除。利用GDI+，可以创建并维护与Graphics对象分开的GraphicsPath 
对象，它不依赖于Graphics对象的生存期。<BR><BR>　　变形和矩阵对象<BR><BR>　　GDI+提供了Matrix对象，它是一种可以使变形(旋转、平移、缩放等) 
简易灵活的强大工具，Matrix对象需与要被变形的对象联合使用。对于GraphicsPath类，我们可以使用其成员函数Transform接收Matrix参数用于变形。<BR><BR>
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    <TD>void CGdiexampleDlg::OnTransformationMatrix()<BR>{<BR>　// TODO: Add 
      your command handler code here<BR>　CClientDC 
      dc(this);<BR>　//创建Graphics对象<BR>　Graphics graphics(dc);<BR>　GraphicsPath 
      path;<BR>　path.AddRectangle(Rect(250, 20, 70, 
      70));<BR>　graphics.DrawPath(&amp;Pen(Color::Black, 1), &amp;path); // 
      在应用变形矩阵之前绘制矩形<BR>　// 路径变形<BR>　Matrix matrix1, 
      matrix2;<BR><BR>　matrix1.Rotate(45.0f); 
      //旋转顺时针45度<BR>　path.Transform(&amp;matrix1); 
      //应用变形<BR>　graphics.DrawPath(&amp;Pen(Color::Red, 3), 
      &amp;path);<BR><BR>　matrix2.Scale(1.0f, 0.5f); 
      //转化成为平行四边形法则<BR>　path.Transform(&amp;matrix2); 
      //应用变形<BR>　graphics.DrawPath(&amp;Pen(Color::Blue, 3), &amp;path);<BR>} 
  </TD></TR></TBODY></TABLE><BR>　　图5演示了正方形经过旋转和拉伸之后的效果：黑色的为原始图形，红色的为旋转45度之后的图形，蓝色的为经过拉伸为平行四边形后的图形。 
<BR><BR>
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      <DIV align=center><IMG 
      src="Windows GDI和GDI+编程实例剖析_4.files/2hs325j8mu2t.jpg" border=0><BR>图5 
      GDI+变形和矩阵对象</DIV></TD></TR></TBODY></TABLE><BR>　　<STRONG>可伸缩区域<BR></STRONG><BR>　　GDI+通过对区域(Region)的支持极大地扩展了GDI。在GDI 
中，区域存储在设备坐标中，可应用于区域的唯一变形是平移。但是在GDI 
+中，区域存储在全局坐标(世界坐标)中，可对区域利用变形矩阵进行变形(旋转、平移、缩放等)。<BR><BR>
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    <TD>void CGdiexampleDlg::OnScalableRegion()<BR>{<BR>　// TODO: Add your 
      command handler code here<BR>　CClientDC 
      dc(this);<BR>　//创建Graphics对象<BR>　Graphics 
      graphics(dc);<BR>　//创建GraphicsPath<BR>　GraphicsPath 
      path;<BR>　path.AddLine(100, 100, 150, 150);<BR>　path.AddLine(50, 150, 150, 
      150);<BR>　path.AddLine(50, 150, 100, 100);<BR>　//创建Region<BR>　Region 
      region(&amp;path);<BR>　//填充区域 
      <BR>　graphics.FillRegion(&amp;SolidBrush(Color::Blue), 
      &amp;region);<BR>　//区域变形<BR>　Matrix matrix;<BR>　matrix.Rotate(10.0f); 
      //旋转顺时针20度<BR>　matrix.Scale(1.0f, 0.3f); 
      //拉伸<BR>　region.Transform(&amp;matrix); //应用变形<BR>　//填充变形后的区域 
      <BR>　graphics.FillRegion(&amp;SolidBrush(Color::Green), 
    &amp;region);<BR>}</TD></TR></TBODY></TABLE><BR>　　上述程序中以蓝色填充一个三角形区域，接着将此区域旋转和拉伸，再次显示，其效果如图6。<BR><BR>
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      <DIV align=center><IMG 
      src="Windows GDI和GDI+编程实例剖析_4.files/w01389f036vf.jpg" border=0><BR>图6 
      GDI+区域变形</DIV></TD></TR></TBODY></TABLE><BR>
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