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<title>第 12 章</title>
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<span style="background-color: #CCFF99">第 12 章</span><span style="background-color: #CCFF99">
</span>><span style="background-color: #CCFF99"> 第 3 节 </span>><span style="background-color: #CCFF99">
12.3 绘图综合实例</span></p>
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<p style="line-height: 100%; text-indent: 0; margin: 0" class="右标题" align="left"> </p>
<p style="line-height: 100%; text-indent: 0; margin: 0" class="右标题" align="left"><font size="2"><font FACE="??ì?,SimSun" LANG="ZH-CN">【例</font>12-1<font FACE="??ì?,SimSun" LANG="ZH-CN">】如图所示，在窗口中显示正弦曲线。</font></font></p>
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<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font LANG="ZH-CN" size="2">程序源程序如下：</font></p>
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<blockquote>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">#include
<windows.h></font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">#include
<math.h></font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">#define
NUM 1000</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">#define
TWOPI (2 * 3.14159)</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">LRESULT
CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"> </p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">int
WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">PSTR
szCmdLine, int iCmdShow)</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">{</font></p>
<blockquote>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">static
char szAppName[] = "SineWave" ;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">HWND
hwnd ;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">MSG
msg ;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">WNDCLASSEX
wndclass ;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">wndclass.cbSize
= sizeof (wndclass) ;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">wndclass.style
= CS_HREDRAW | CS_VREDRAW ;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">wndclass.lpfnWndProc
= WndProc ;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">wndclass.cbClsExtra
= 0 ;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">wndclass.cbWndExtra
= 0 ;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">wndclass.hInstance
= hInstance ;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">wndclass.hIcon
= LoadIcon (NULL, IDI_APPLICATION) ;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">wndclass.hCursor
= LoadCursor (NULL, IDC_ARROW) ;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">wndclass.hbrBackground
= (HBRUSH) GetStockObject (WHITE_BRUSH) ;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">wndclass.lpszMenuName
= NULL ;</font></p>
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