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<DIV class=newsmallbox>Windows GDI和GDI+編程實例剖析 </DIV>
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<DIV class=newtitle1>作者： 宋寶華 </DIV>
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<DIV class=guanggao><SPAN 
id=contentAdv></SPAN></DIV>　　<STRONG>Alpha混合</STRONG><BR><BR>　　Alpha允許將兩個物體混合起來顯示，在3D氣氛和場景渲染等方面有廣泛應(yīng)用。它能"霧化"圖像，使得一個圖像著色在另一個半透明的圖像上，呈現(xiàn)一種朦朧美。我們知道，一個像素可用R，G，B三個維度來表示，我們可以再加上第4個即：Alpha維度(channel)，表征透明程度。<BR><BR>
<TABLE borderColor=#cccccc width="90%" align=center bgColor=#e3e3e3 border=1>
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    <TD>void CGdiexampleDlg::OnAlphaBlend()<BR>{<BR>　// TODO: Add your command 
      handler code here<BR>　CClientDC dc(this);<BR>　//創(chuàng)建Graphics對象<BR>　Graphics 
      graphics(dc);<BR>　//創(chuàng)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>　//將ColorMatrix賦給ImageAttributes<BR>　ImageAttributes 
      ImgAttr;<BR>　ImgAttr.SetColorMatrix(&amp;ClrMatrix, 
      ColorMatrixFlagsDefault,ColorAdjustTypeBitmap);<BR>　//在矩形區(qū)域內(nèi)顯示jpg圖像<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>　//在平行四邊形區(qū)域內(nèi)顯示jpg圖像<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>　　上述程序中將D盤根目錄下文件名為"1.jpg"的圖像以矩陣和平行四邊形兩種方式顯示，然后將文件名為為"2.jpg"的圖像與之進行混合，其效果如圖8。<BR><BR>
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      <DIV align=center><IMG 
      src="Windows GDI和GDI+編程實例剖析_6.files/icv0m9u6rl31.jpg" border=0><BR>圖8 GDI+ 
      Alpha混合</DIV></TD></TR></TBODY></TABLE><BR>　　為了能進行Alpha混合，我們需要使用ImageAttributes類和ColorMatrix矩陣，ImageAttributes可以進行顏色、灰度等調(diào)整從而達到控制圖像著色方式的目的。ColorMatrix是ImageAttributes類大多數(shù)函數(shù)的參數(shù)，它包含了Alpha、Red、Green、Blue維度的值，以及另一維w，順序為RGBaw。<BR><BR>　　CGdiexampleDlg::OnAlphaBlend()函數(shù)中ColorMatrix的實例ClrMatrix中元素(4,4)的值為0.5，表示Alpha度的值為0.5(即半透明)。在ColorMatrix中，元素(5,5)的值恒定為1.0。我們把ClrMatrix的元素(0,0)修改為0.0，即使得圖像2.jpg的紅色維度全不顯示，再看效果，為圖9。列位讀者，我們以前在豪杰超級解霸中調(diào)整R，G，B值從而控制圖像輸出顏色的時候，調(diào)的就是這個東東！圖9的效果很像破舊彩色電視機，紅色電子槍"嗝"了。剛大學(xué)畢業(yè)時，俺那個叫窮啊，就買了這么個電視機，還看得很爽，真是往事不堪回首！<BR><BR>
<TABLE width="90%" align=center border=0>
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    <TD>
      <DIV align=center><IMG 
      src="Windows GDI和GDI+編程實例剖析_6.files/q811cb0964mz.jpg" border=0><BR>圖9 
      GDI+中的ColorMatrix</DIV></TD></TR></TBODY></TABLE><BR>
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