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📄 symbian编程总结-图形图像篇-使用双缓存进行图形的绘制 - 技术应用 - 豆豆网.htm

📁 Symbian编程总结-图形图像篇-使用双缓存进行图形的绘制
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</P>
<P>　　关键部分代码： </P>
<P><CODE>/**<BR>* 初始化双缓冲区<BR>*/<BR>void 
CTestDoubleBufferAppView::InitDoubleBufferL()<BR>{<BR>iBufBmp = 
new(ELeave)CWsBitmap(CEikonEnv::Static()-&gt;WsSession());<BR>CleanupStack::PushL(iBufBmp);<BR>User::LeaveIfError(iBufBmp-&gt;Create(Rect().Size(), 
CEikonEnv::Static()-&gt;ScreenDevice()-&gt;DisplayMode()));<BR>iBufDevice = 
CFbsBitmapDevice::NewL(iBufBmp);<BR>CleanupStack::PushL(iBufDevice);<BR>User::LeaveIfError(iBufDevice-&gt;CreateBitmapContext(iBufGc));<BR>CleanupStack::Pop(2); 
// iDevice, iBufBmp<BR>}<BR>/**<BR>* 测试在缓冲区上绘制<BR>*/<BR>void 
CTestDoubleBufferAppView::DoTestDraw()<BR>{<BR>iBufGc-&gt;Clear(Rect());<BR>// 
在buffer里画方块，而不是在屏幕上<BR>for (int i=0; i&lt;100; 
i+=2)<BR>{<BR>iBufGc-&gt;DrawRect(TRect(TPoint(i, i), TSize(50, 
50)));<BR>}<BR>}<BR>/**<BR>* View的重绘事件<BR>*/<BR>void 
CTestDoubleBufferAppView::Draw(const TRect&amp; /*aRect*/) const<BR>{<BR>// 
以下代码忽略<BR>//　　// Get the standard graphics context<BR>//　　CWindowGc&amp; gc = 
SystemGc();<BR>//<BR>//　　// Gets the control's extent<BR>//　　TRect 
drawRect(Rect());<BR>//<BR>//　　// Clears the 
screen<BR>//　　gc.Clear(drawRect);<BR>SystemGc().BitBlt(TPoint(0, 0), 
iBufBmp);<BR>}</CODE></P></DIV></DIV><!-- 分页 --><!-- 分页end -->
<P 
style="PADDING-RIGHT: 4px; FONT-SIZE: 12px; COLOR: #000000; TEXT-ALIGN: right">来源：博客园 
&nbsp;&nbsp; 作者：杨芹勍 &nbsp;&nbsp; 责编：豆豆技术应用</P>
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