?? 基于visual c++的gdi常用坐標(biāo)系統(tǒng)及應(yīng)用 (2).htm
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<DIV align=center><B> <IMG alt=基于VisualC++的GDI常用坐標(biāo)系統(tǒng)及應(yīng)用(2)
src="基于Visual C++的GDI常用坐標(biāo)系統(tǒng)及應(yīng)用 (2).files/1011530693.gif"
border=1><BR> 圖五、代碼效果圖</B> </DIV></TD></TR></TBODY></TABLE></P>
<DIV><BR> 需要注意的是，你也可以相對(duì)于客戶區(qū)域來(lái)指定坐標(biāo)原點(diǎn)<BR> <BR>
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<DIV>void CExoDraw1View::OnPaint() </DIV>
<DIV>{</DIV>
<DIV> CPaintDC dc(this); //繪圖的設(shè)備上下文；</DIV>
<DIV> CRect Recto;</DIV>
<DIV> //獲取客戶區(qū)尺寸；</DIV>
<DIV> GetClientRect(&Recto);</DIV>
<DIV> dc.SetViewportOrg(Recto.Width() / 2, Recto.Height() / 2);</DIV>
<DIV> // A circle whose center is at the origin (0, 0)</DIV>
<DIV> dc.Ellipse(-50, -50, 50, 50);</DIV>
<DIV> // A line that starts at (0, 0) and ends at (100, 100)</DIV>
<DIV> dc.MoveTo(0, 0);</DIV>
<DIV> dc.LineTo(100, 100);</DIV>
<DIV>}</DIV></TD></TR></TBODY></TABLE><BR></DIV>
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<DIV align=center><IMG alt=基于VisualC++的GDI常用坐標(biāo)系統(tǒng)及應(yīng)用(2)
src="基于Visual C++的GDI常用坐標(biāo)系統(tǒng)及應(yīng)用 (2).files/2468559300.gif"
border=1><BR> <B>圖六、代碼效果圖</B> </DIV></TD></TR></TBODY></TABLE></P>
<DIV><BR> 現(xiàn)在你已了解了如何設(shè)置坐標(biāo)原點(diǎn)，讓我們來(lái)將（380，220）點(diǎn)作為坐標(biāo)原點(diǎn)，并繪制出笛卡爾的坐標(biāo)軸：<BR> <BR>
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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.SetViewportOrg(380, 220);</DIV>
<DIV> // Use a red pen</DIV>
<DIV> CPen PenRed(PS_SOLID, 1, RGB(255, 0, 0));</DIV>
<DIV> dc.SelectObject(PenRed);</DIV>
<DIV> // A circle whose center is at the origin (0, 0)</DIV>
<DIV> dc.Ellipse(-100, -100, 100, 100);</DIV>
<DIV> // Use a blue pen</DIV>
<DIV> CPen PenBlue(PS_SOLID, 1, RGB(0, 0, 255));</DIV>
<DIV> dc.SelectObject(PenBlue);</DIV>
<DIV> // Horizontal axis</DIV>
<DIV> dc.MoveTo(-380, 0);</DIV>
<DIV> dc.LineTo(380, 0);</DIV>
<DIV> // Vertical axis</DIV>
<DIV> dc.MoveTo(0, -220);</DIV>
<DIV> dc.LineTo(0, 220);</DIV>
<DIV>}</DIV></TD></TR></TBODY></TABLE><BR></DIV>
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<DIV align=center><IMG alt=基于VisualC++的GDI常用坐標(biāo)系統(tǒng)及應(yīng)用(2)
src="基于Visual C++的GDI常用坐標(biāo)系統(tǒng)及應(yīng)用 (2).files/490570559.gif"
border=1><BR> <B>圖七、代碼效果圖</B> </DIV></TD></TR></TBODY></TABLE></P>
<DIV><BR> 正如已經(jīng)看到的，SetViewportOrg()函數(shù)可以更改設(shè)備上下文的坐標(biāo)原點(diǎn)，同時(shí)，它也用來(lái)規(guī)定坐標(biāo)軸的正方向，即水平軸向右，垂直軸向下：<BR><BR>
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<DIV><IMG alt=基于VisualC++的GDI常用坐標(biāo)系統(tǒng)及應(yīng)用(2)
src="基于Visual C++的GDI常用坐標(biāo)系統(tǒng)及應(yīng)用 (2).files/3687739776.gif"
border=1><BR></DIV> <B>圖八、坐標(biāo)軸示意圖</B> </DIV></TD></TR></TBODY></TABLE></DIV>
<DIV><BR> 為了說(shuō)明這一點(diǎn)，下面來(lái)繪制一條黃色的45度角的直線：</DIV>
<P> </P>
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<DIV>void CExoDraw1View::OnPaint() </DIV>
<DIV>{</DIV>
<DIV> CPaintDC dc(this); // device context for painting</DIV>
<DIV> dc.SetViewportOrg(380, 220);</DIV>
<DIV> // Use a red pen</DIV>
<DIV> CPen PenRed(PS_SOLID, 1, RGB(255, 0, 0));</DIV>
<DIV> dc.SelectObject(PenRed);</DIV>
<DIV> // A circle whose center is at the origin (0, 0)</DIV>
<DIV> dc.Ellipse(-100, -100, 100, 100);</DIV>
<DIV> // Use a blue pen</DIV>
<DIV> CPen PenBlue(PS_SOLID, 1, RGB(0, 0, 255));</DIV>
<DIV> dc.SelectObject(PenBlue);</DIV>
<DIV> // Horizontal axis</DIV>
<DIV> dc.MoveTo(-380, 0);</DIV>
<DIV> dc.LineTo(380, 0);</DIV>
<DIV> // Vertical axis</DIV>
<DIV> dc.MoveTo(0, -220);</DIV>
<DIV> dc.LineTo(0, 220);</DIV>
<DIV> // An orange pen</DIV>
<DIV> CPen PenOrange(PS_SOLID, 1, RGB(255, 128, 0));</DIV>
<DIV> dc.SelectObject(PenOrange);</DIV>
<DIV> // A diagonal line at 45 degrees</DIV>
<DIV> dc.MoveTo(0, 0);</DIV>
<DIV> dc.LineTo(120, 120);</DIV>
<DIV>}</DIV></TD></TR></TBODY></TABLE><BR></DIV>
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<DIV align=center><IMG alt=基于VisualC++的GDI常用坐標(biāo)系統(tǒng)及應(yīng)用(2)
src="基于Visual C++的GDI常用坐標(biāo)系統(tǒng)及應(yīng)用 (2).files/3133031468.gif"
border=1><BR> <B>圖九、代碼效果圖</B> </DIV></TD></TR></TBODY></TABLE></P>
<DIV><BR> 正如你所看到的，我們的直線沒(méi)有在45度位置，而是位于坐標(biāo)系統(tǒng)的第四象限，造成這種情況的原因是默認(rèn)的坐標(biāo)系統(tǒng)。</DIV>
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