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<p class="MsoNormal"><font size="2"><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">一个逻辑单位被映射成</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">0.01</span><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">英寸，正</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">X</span><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">向右，正</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">Y</span><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">向上</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
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<p ALIGN="JUSTIFY"><font lang="ZH-CN" size="2">窗口是对应逻辑坐标系上程序员设定的一个区域，视口是对应于实际输出设备上程序员设定的一个区域。下面给出逻辑单位到设备单位的变换公式：</font></p>
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<p ALIGN="JUSTIFY"><font size="2" color="#008000">X<font LANG="ZH-CN">比例因子</font> =
X<font LANG="ZH-CN">视口范围</font>/X<font LANG="ZH-CN">窗口范围</font></font></p>
<p ALIGN="JUSTIFY"><font size="2" color="#008000">Y<font LANG="ZH-CN">比例因子</font> =
Y<font LANG="ZH-CN">视口范围</font>/Y<font LANG="ZH-CN">窗口范围</font></font></p>
<p ALIGN="JUSTIFY"><font size="2" color="#008000"><font LANG="ZH-CN">设备</font>X = <font LANG="ZH-CN">逻辑</font>X
*X<font LANG="ZH-CN">比例因子</font> + X<font LANG="ZH-CN">坐标原点偏移</font></font></p>
<p ALIGN="JUSTIFY"><font size="2" color="#008000"><font LANG="ZH-CN">设备</font>Y = <font LANG="ZH-CN">逻辑</font>Y
*Y<font LANG="ZH-CN">比例因子</font> + Y<font LANG="ZH-CN">坐标原点偏移</font></font></p>
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<p ALIGN="JUSTIFY"></font><font LANG="ZH-CN">在逻辑坐标和设备坐标之间进行转换要利用</font><font size="2">CDC<font LANG="ZH-CN">的</font><font color="#008000">LPtoDP(
)</font><font LANG="ZH-CN">和</font><font color="#008000">DPtoLP( )</font><font LANG="ZH-CN">。</font></font></p>
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<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font LANG="ZH-CN" size="2">下面我们列出进行坐标映射工作的时候所要遵循的一些规则：</font></p>
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<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font LANG="ZH-CN">① 可以认为</font>CDC<font LANG="ZH-CN">的所有成员函数都以逻辑坐标作为参数，但和</font>CRect<font LANG="ZH-CN">有关的函数例外。</font></font></p>
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<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font LANG="ZH-CN">② 可以认为</font>CWnd<font LANG="ZH-CN">的成员函数都以设备坐标作为参数。</font></font></p>
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<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font LANG="ZH-CN" size="2">③
以逻辑坐标的形式来保存数据，否则用户对窗口进行滚动操作的时候，这个数据就不再有效了。</font></p>
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