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<DIV class=guanggao><SPAN 
id=contentAdv></SPAN></DIV>　　<STRONG>Alpha混合</STRONG><BR><BR>　　Alpha允许将两个物体混合起来显示，在3D气氛和场景渲染等方面有广泛应用。它能"雾化"图像，使得一个图像着色在另一个半透明的图像上，呈现一种朦胧美。我们知道，一个像素可用R，G，B三个维度来表示，我们可以再加上第4个即：Alpha维度(channel)，表征透明程度。<BR><BR>
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    <TD>void CGdiexampleDlg::OnAlphaBlend()<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ColorMatrix<BR>　ColorMatrix ClrMatrix 
      =<BR>　{<BR>　　1.0f, 0.0f, 0.0f, 0.0f, 0.0f,<BR>　　0.0f, 1.0f, 0.0f, 0.0f, 
      0.0f,<BR>　　0.0f, 0.0f, 1.0f, 0.0f, 0.0f,<BR>　　0.0f, 0.0f, 0.0f, 0.5f, 
      0.0f,<BR>　　0.0f, 0.0f, 0.0f, 0.0f, 
      1.0f<BR>　};<BR>　//将ColorMatrix赋给ImageAttributes<BR>　ImageAttributes 
      ImgAttr;<BR>　ImgAttr.SetColorMatrix(&amp;ClrMatrix, 
      ColorMatrixFlagsDefault,ColorAdjustTypeBitmap);<BR>　//在矩形区域内显示jpg图像<BR>　Image 
      img1(L "d:\\1.jpg");<BR>　Point destPoints1[3] =<BR>　{<BR>　　Point(10, 10), 
      Point(220, 10), Point(10, 290)<BR>　};<BR>　graphics.DrawImage(&amp;img1, 
      destPoints1, 3);<BR>　//Alpha混合<BR>　Image img2(L "d:\\2.jpg");<BR>　int 
      width, height;<BR>　width = img2.GetWidth();<BR>　height = 
      img2.GetHeight();<BR>　graphics.DrawImage(&amp;img2, RectF(10, 10, 210, 
      280), 0, 0, width, height,UnitPixel, 
      &amp;ImgAttr);<BR>　//在平行四边形区域内显示jpg图像<BR>　Point destPoints2[3] 
      =<BR>　{<BR>　　Point(230, 10), Point(440, 10), Point(270, 
      290)<BR>　};<BR>　graphics.DrawImage(&amp;img1, destPoints2, 
      3);<BR>　//Alpha混合<BR>　graphics.DrawImage(&amp;img2, destPoints2, 3, 0, 0, 
      width, height, 
UnitPixel,&amp;ImgAttr);<BR>}</TD></TR></TBODY></TABLE><BR>　　上述程序中将D盘根目录下文件名为"1.jpg"的图像以矩阵和平行四边形两种方式显示，然后将文件名为为"2.jpg"的图像与之进行混合，其效果如图8。<BR><BR>
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    <TD>
      <DIV align=center><IMG 
      src="Windows GDI和GDI+编程实例剖析_6.files/icv0m9u6rl31.jpg" border=0><BR>图8 GDI+ 
      Alpha混合</DIV></TD></TR></TBODY></TABLE><BR>　　为了能进行Alpha混合，我们需要使用ImageAttributes类和ColorMatrix矩阵，ImageAttributes可以进行颜色、灰度等调整从而达到控制图像着色方式的目的。ColorMatrix是ImageAttributes类大多数函数的参数，它包含了Alpha、Red、Green、Blue维度的值，以及另一维w，顺序为RGBaw。<BR><BR>　　CGdiexampleDlg::OnAlphaBlend()函数中ColorMatrix的实例ClrMatrix中元素(4,4)的值为0.5，表示Alpha度的值为0.5(即半透明)。在ColorMatrix中，元素(5,5)的值恒定为1.0。我们把ClrMatrix的元素(0,0)修改为0.0，即使得图像2.jpg的红色维度全不显示，再看效果，为图9。列位读者，我们以前在豪杰超级解霸中调整R，G，B值从而控制图像输出颜色的时候，调的就是这个东东！图9的效果很像破旧彩色电视机，红色电子枪"嗝"了。刚大学毕业时，俺那个叫穷啊，就买了这么个电视机，还看得很爽，真是往事不堪回首！<BR><BR>
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      <DIV align=center><IMG 
      src="Windows GDI和GDI+编程实例剖析_6.files/q811cb0964mz.jpg" border=0><BR>图9 
      GDI+中的ColorMatrix</DIV></TD></TR></TBODY></TABLE><BR>
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