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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>渐变的画刷<BR></STRONG><BR>　　GDI+提供了用于填充图形、路径和区域的线性渐变画刷和路径渐变画刷。<BR><BR>　　线性渐变画刷使用渐变颜色来填充图形。<BR><BR>　　当用路径渐变画刷填充图形时，可指定从图形的一部分移至另一部分时画刷颜色的变化方式。例如，我们可以只指定图形的中心颜色和边缘颜色，当画刷从图形中间向外边缘移动时，画刷会逐渐从中心颜色变化到边缘颜色。 
<BR><BR>
<TABLE borderColor=#cccccc width="90%" align=center bgColor=#e3e3e3 border=1>
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    <TD>void CGdiexampleDlg::OnGradientBrush()<BR>{<BR>　// TODO: Add your 
      command handler code here<BR>　CClientDC dc(this);<BR>　CRect 
      rect;<BR>　GetClientRect(&amp;rect);<BR>　//创建Graphics对象<BR>　Graphics 
      graphics(dc);<BR>　//创建渐变画刷<BR>　LinearGradientBrush lgb(Point(0, 0), 
      Point(rect.right, rect.bottom), Color::Blue, 
      Color::Green);<BR>　//填充<BR>　graphics.FillRectangle(&amp;lgb, 0, 0, 
      rect.right, 
rect.bottom);<BR>}</TD></TR></TBODY></TABLE><BR>　　本程序使用线性渐变画刷，当画刷从客户区左上角移向客户区右下角的过程中，颜色逐渐由蓝色转变为绿色。<BR><BR>
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      <DIV align=center><IMG 
      src="Windows GDI和GDI+编程实例剖析_3.files/s12562e00igl.jpg" border=0><BR>图3 
      GDI+渐变画刷</DIV></TD></TR></TBODY></TABLE><BR>　　<STRONG>基数样条函数</STRONG><BR><BR>　　GDI+支持基数样条，基数样条指的是一连串单独的曲线，这些曲线连接起来形成一条较大的曲线。样条由点(Point结构体)的数组指定，并通过该数组中的每一个点。基数样条平滑地穿过数组中的每一个点(不出现尖角)，因此比用直线连接创建的路径精确。<BR><BR>
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    <TD>void CGdiexampleDlg::OnCardinalSpline()<BR>{<BR>　// TODO: Add your 
      command handler code here<BR>　CClientDC 
      dc(this);<BR>　//创建Graphics对象<BR>　Graphics graphics(dc);<BR>　Point points[] 
      =<BR>　{<BR>　　Point(0, 0), Point(100, 200), Point(200, 0), Point(300, 200), 
      Point(400, 00)<BR>　};<BR>　//直接画线<BR>　for (int i = 0; i &lt; 4; 
      i++)<BR>　{<BR>　　graphics.DrawLine(&amp;Pen(Color::Blue, 3), points[i], 
      points[i + 
      1]);<BR>　}<BR>　//利用基数样条画线<BR>　graphics.DrawCurve(&amp;Pen(Color::Red, 3), 
      points, 
5);<BR>}</TD></TR></TBODY></TABLE><BR>　　图4演示了直接连线和经过基数样条平滑拟合后的线条的对比，后者的曲线(Curve)没有尖角。这个工作我们在中学的数学课上把离散的点连接成曲线时做过。<BR><BR>
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    <TD>
      <DIV align=center><IMG 
      src="Windows GDI和GDI+编程实例剖析_3.files/97kivzht5i8i.jpg" border=0><BR>图4 
      GDI+基数样条</DIV></TD></TR></TBODY></TABLE><BR>
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