📄 基于visual c++的gdi常用坐标系统及应用 (3).htm
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<DIV align=center><B><IMG alt=基于VisualC++的GDI常用坐标系统及应用(3)
src="基于Visual C++的GDI常用坐标系统及应用 (3).files/2671452568.gif"
border=1><BR>图十一、MM_LOENGLISH</B><B>映射模式下的坐标系</B></DIV></TD></TR></TBODY></TABLE>
<DIV> 此外，度量单位改为0.01英寸，这意味着你提供的坐标将除以100，观察上述代码的MM_LOENGLISH映射效果</DIV>
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<DIV>void CExoDraw1View::OnPaint() </DIV>
<DIV>{</DIV>
<DIV> CPaintDC dc(this); // device context for painting</DIV>
<DIV> dc.SetMapMode(MM_LOENGLISH);</DIV>
<DIV> dc.SetViewportOrg(380, 220);</DIV>
<DIV> . . .</DIV>
<DIV>}</DIV></TD></TR></TBODY></TABLE><BR></DIV>
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<DIV align=center><B><IMG alt=基于VisualC++的GDI常用坐标系统及应用(3)
src="基于Visual C++的GDI常用坐标系统及应用 (3).files/2222770685.gif"
border=1><BR>图十二、代码效果图</B></DIV></TD></TR></TBODY></TABLE>
<DIV> 正如你所看到的，直线现在位于坐标系的第一象限，同时，直线比以前缩短，圆也比以前的要小。</DIV>
<DIV> 与MM_LOENGLISH映射模式相似，MM_HIENGLISH映射模式也是垂直坐标轴正向向上，只是它以0.001英寸为坐标单位，下面是它的效果：</DIV>
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<DIV>void CExoDraw1View::OnPaint() </DIV>
<DIV>{</DIV>
<DIV> CPaintDC dc(this); // device context for painting</DIV>
<DIV> dc.SetMapMode(MM_HIENGLISH);</DIV>
<DIV> dc.SetViewportOrg(380, 220);</DIV>
<DIV> . . . Same as previous</DIV>
<DIV>}</DIV></TD></TR></TBODY></TABLE><BR>
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<DIV align=center><B><IMG alt=基于VisualC++的GDI常用坐标系统及应用(3)
src="基于Visual C++的GDI常用坐标系统及应用 (3).files/1003829713.gif"
border=1><BR>图十三、代码效果图</B></DIV></TD></TR></TBODY></TABLE> </DIV>
<DIV> MM_LOMETRIC映射模式使用与上两种映射模式相同的坐标轴，不同的是MM_LOMETRIC使用0.1毫米为单位，下面是一个例子：</DIV>
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<DIV>void CExoDraw1View::OnPaint() </DIV>
<DIV>{</DIV> CPaintDC dc(this); // device context for painting
<DIV> dc.SetMapMode(MM_LOMETRIC);</DIV>
<DIV> dc.SetViewportOrg(380, 220);</DIV>
<DIV> . . .</DIV>
<DIV>}</DIV></TD></TR></TBODY></TABLE></DIV><BR>
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<DIV align=center><IMG alt=基于VisualC++的GDI常用坐标系统及应用(3)
src="基于Visual C++的GDI常用坐标系统及应用 (3).files/355256048.gif"
border=1><BR><B>图十四、代码效果图</B></DIV></TD></TR></TBODY></TABLE>
<DIV><BR> MM_HIMETRIC使用与上述三种映射模式相同的坐标系，但它的坐标单位是0.01毫米，下面例子代码如下：</DIV>
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<DIV>void CExoDraw1View::OnPaint() </DIV>
<DIV>{</DIV>
<DIV> CPaintDC dc(this); // device context for painting</DIV>
<DIV> dc.SetMapMode(MM_HIMETRIC);</DIV>
<DIV> dc.SetViewportOrg(380, 220);</DIV>
<DIV> . . . Same as previous</DIV>
<DIV>}</DIV></TD></TR></TBODY></TABLE><BR></DIV>
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<DIV align=center><B><IMG alt=基于VisualC++的GDI常用坐标系统及应用(3)
src="基于Visual C++的GDI常用坐标系统及应用 (3).files/3267253666.gif"
border=1><BR>图十五、代码效果图</B> </DIV></TD></TR></TBODY></TABLE>
<DIV> MM_TWIPS映射模式将每个逻辑单位（像素）除以20，实际上一twip等于1/1440 英寸，坐标系统仍然与上面几种映射方式相同。</DIV>
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<DIV>void CExoDraw1View::OnPaint() </DIV>
<DIV>{</DIV>
<DIV> CPaintDC dc(this); // device context for painting</DIV>
<DIV> CRect Recto;</DIV>
<DIV> dc.SetMapMode(MM_TWIPS);</DIV>
<DIV> dc.SetViewportOrg(380, 220);</DIV>
<DIV> . . .</DIV>
<DIV>}</DIV></TD></TR></TBODY></TABLE></DIV><BR>
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<DIV align=center><B><IMG alt=基于VisualC++的GDI常用坐标系统及应用(3)
src="基于Visual C++的GDI常用坐标系统及应用 (3).files/3883170230.gif"
border=1><BR>图十六、代码效果图</B></DIV></TD></TR></TBODY></TABLE></DIV>
<DIV></DIV>
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