?? 基于visual c++的gdi常用坐標系統及應用 (5).htm
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<DIV> GetClientRect(&Recto);</DIV>
<DIV> CBrush bgBrush(BLACK_BRUSH);</DIV>
<DIV> dc.SelectObject(bgBrush);</DIV>
<DIV> dc.Rectangle(Recto);</DIV>
<DIV> CPen PenBlue(PS_SOLID, 1, RGB(0, 0, 255));</DIV>
<DIV> dc.SelectObject(PenBlue);</DIV>
<DIV> for(int x = 0; x < Recto.Width(); x += 20)</DIV>
<DIV> {</DIV>
<DIV> dc.MoveTo(x, 0);</DIV> dc.LineTo(x, Recto.Height());
<DIV> }</DIV>
<DIV> for(int y = 0; y < Recto.Height(); y += 20)</DIV> {
<DIV> dc.MoveTo(0, y);</DIV> dc.LineTo(Recto.Width(), y);
<DIV> }</DIV>
<DIV>}</DIV></TD></TR></TBODY></TABLE><BR></DIV>
<P>
<TABLE width="90%" align=center border=0>
<TBODY>
<TR>
<TD>
<DIV align=center><IMG alt=基于VisualC++的GDI常用坐標系統及應用(5)
src="基于Visual C++的GDI常用坐標系統及應用 (5).files/270621512.gif"
border=1><BR> <B>圖二十三、代碼效果圖</B></DIV></TD></TR></TBODY></TABLE>
</P>
<DIV></DIV>
<DIV><B> 例3：點狀網格</B></DIV>
<P> </P>
<DIV>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#dadacf
border=1>
<TBODY>
<TR>
<TD>
<DIV>void CExoDraw1View::OnPaint() </DIV>
<DIV>{</DIV> CPaintDC dc(this); // device context for painting
<DIV> CRect Recto;</DIV>
<DIV> GetClientRect(&Recto);</DIV> CBrush bgBrush(BLACK_BRUSH);
<DIV> dc.SelectObject(bgBrush);</DIV> dc.Rectangle(Recto);
<DIV> for(int x = 0; x < Recto.Width(); x += 20)</DIV> {
<DIV> for(int y = 0; y < Recto.Height(); y += 20)</DIV> {
<DIV> dc.SetPixel(x, y, RGB(255, 255, 255));</DIV> }
<DIV> }</DIV>
<DIV>}</DIV></TD></TR></TBODY></TABLE><BR></DIV>
<P>
<TABLE width="90%" align=center border=0>
<TBODY>
<TR>
<TD>
<DIV align=center><B><IMG alt=基于VisualC++的GDI常用坐標系統及應用(5)
src="基于Visual C++的GDI常用坐標系統及應用 (5).files/2697046943.gif"
border=1><BR>圖二十四、代碼效果</B> </DIV></TD></TR></TBODY></TABLE></P>
<DIV> </DIV>
<DIV><B> 例4：正弦圖形</B></DIV>
<P> </P>
<DIV>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#dadacf
border=1>
<TBODY>
<TR>
<TD>
<DIV>void CExoView::OnPaint() </DIV>
<DIV>{</DIV>
<DIV> CPaintDC dc(this); // device context for painting</DIV>
<DIV> // TODO: Add your message handler code here</DIV>
<DIV> dc.SetMapMode(MM_ANISOTROPIC);</DIV>
<DIV> dc.SetViewportOrg(340, 220);</DIV>
<DIV> dc.SetWindowExt(1440, 1440);</DIV>
<DIV> dc.SetViewportExt(-1440, -220);</DIV>
<DIV> CPen PenBlue(PS_SOLID, 1, RGB(0, 0, 255));</DIV>
<DIV> dc.SelectObject(PenBlue);</DIV>
<DIV> // Axes</DIV>
<DIV> dc.MoveTo(-300, 0);</DIV>
<DIV> dc.LineTo( 300, 0);</DIV>
<DIV> dc.MoveTo( 0, -1400);</DIV>
<DIV> dc.LineTo( 0, 1400);</DIV>
<DIV> // I am exaggerating with the PI value here but why not?</DIV>
<DIV> const double PI = 3.141592653589793238462643383279;</DIV>
<DIV> // The following two values were chosen randomly by me.</DIV>
<DIV> // You can chose other values you like</DIV>
<DIV> const int MultiplyEachUnitOnX = 50;</DIV>
<DIV> const int MultiplyEachUnitOnY = 250;</DIV>
<DIV> for(double i = -280; i < 280; i += 0.01)</DIV>
<DIV> {</DIV> double j = sin(PI / MultiplyEachUnitOnX * i) * MultiplyEachUnitOnY;
<DIV> dc.SetPixel(i, j, RGB(255, 0, 0));</DIV>
<DIV> }</DIV>
<DIV> // Do not call CView::OnPaint() for painting messages</DIV>
<DIV>}</DIV></TD></TR></TBODY></TABLE><BR></DIV>
<P>
<TABLE width="90%" align=center border=0>
<TBODY>
<TR>
<TD>
<DIV align=center><B><IMG alt=基于VisualC++的GDI常用坐標系統及應用(5)
src="基于Visual C++的GDI常用坐標系統及應用 (5).files/1890606130.gif"
border=1><BR>圖二十五、代碼效果圖</B></DIV></TD></TR></TBODY></TABLE></P><SPAN
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