📄 chord.htm
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<title>Chord</title>
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<td width="100%" height="16"><a name="Chord">Chord</a></td>
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<td width="101%" colspan="2">VB声明</td>
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<td width="101%" colspan="2">Declare Function Chord Lib "gdi32" Alias
"Chord" (ByVal As Long, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As
Long, ByVal Y2 As Long, ByVal X3 As Long, ByVal Y3 As Long, ByVal X4 As Long, ByVal Y4 As
Long) As Long</td>
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<td width="101%" colspan="2">说明</td>
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<td width="101%" colspan="2">象注解中那样画一个弦。（X1,Y1）和（X2,Y2）定义了椭圆的一个范围（约束）矩形。点（X3,Y3）和点（X4,Y4）定义了一条线段。该线段与椭圆之间的区域就是“弦”</td>
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<td width="101%" colspan="2">返回值</td>
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<td width="101%" colspan="2">Long，非零表示成功，零表示失败。会设置<a
href="GetLastError.htm" tppabs="http://personal.hb.cninfo.net/~vbapi/GetLastError.htm">GetLastError</a></td>
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<td width="101%" colspan="2">参数表</td>
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<td width="50%">参数</td>
<td width="50%">类型及说明</td>
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<td width="50%">hdc</td>
<td width="50%">Long，一个显示场景的句柄</td>
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<td width="50%">X1,Y1</td>
<td width="50%">Long，指定围绕椭圆的一个矩形的左上角位置</td>
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<td width="50%">X2,Y2</td>
<td width="50%">Long，指定围绕椭圆的一个矩形的右下角位置</td>
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<td width="50%">X3,Y3</td>
<td width="50%">Long，指定与椭圆相交的一条线的一个点</td>
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<td width="50%">X4,Y4</td>
<td width="50%">Long，指定与椭圆相交的一条线的另一个点</td>
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<td width="101%" colspan="2">注解</td>
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<td width="50%"><p align="left"><img src="Chord.gif" tppabs="http://personal.hb.cninfo.net/~vbapi/Chord.gif" alt="Chord.gif (1010 字节)"
WIDTH="207" HEIGHT="157"></td>
<td width="50%">在win16和win95中，约束矩形的宽度和高度必须在3——32766个单位之间。请参考<a
href="Arc.htm" tppabs="http://personal.hb.cninfo.net/~vbapi/Arc.htm">Arc</a>获得更详细的图例</td>
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<td width="100%"><p align="right"><a href="#Chord">Top</a></td>
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