📄 基于visual c++的gdi常用坐标系统及应用_1.htm
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<DIV><B> 二、默认的坐标系统<BR> </B></DIV>
<P> 当在<A class=akey href="http://www.microsoft.com/china"
target=_blank>微软</A>的窗口中进行绘图时，绘图的坐标原点在屏幕的左上角，任何物体在屏幕上定位都要参考这个坐标原点。在笛卡尔坐标系统中这个点被定义为坐标原点（0，0），水平坐标轴的正方向是从该点出发向右延伸，垂直坐标轴的正方向是从该点出发向下延伸。<BR><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
src="基于Visual C++的GDI常用坐标系统及应用_1.files/3234150871.gif"
border=1><BR>图一、笛卡尔坐标系</B></DIV></TD></TR></TBODY></TABLE><BR> 这个坐标原点只是<A
class=akey
href="http://tech.sina.com.cn/introduction/focus/pcos.shtml"
target=_blank>操作系统</A>默认的坐标原点，所以如果你调用Ellipse(-100, -100, 100, 100)函数来绘制图形的话，你将得到一个圆，它的圆心位于屏幕的左上角，仅仅只有圆的四分之一部分（270度到360度的部分）显示在屏幕上。代码及效果图如下
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<DIV>void CExoDraw1View::OnPaint() </DIV>
<DIV>{</DIV>
<DIV> CPaintDC dc(this); // 绘图的设备厂上下文</DIV>
<DIV> CPen PenBlue;</DIV>
<DIV> // 兰色画笔</DIV>
<DIV> PenBlue.CreatePen(PS_SOLID, 1, RGB(0, 12, 255));</DIV>
<DIV> dc.SelectObject(&pPen);</DIV>
<DIV> dc.Ellipse(-100, -100, 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常用坐标系统及应用
src="基于Visual C++的GDI常用坐标系统及应用_1.files/375035875.gif"
border=1><BR> <B>图二、代码效果图</B> </DIV></TD></TR></TBODY></TABLE></P>
<DIV><BR> 按照同样的原理，你可以使用CpaintDC的方法或按照你的要求创建函数来绘制任何几何或非几何图形。例如，下面的代码绘制了两条相互垂直的直线，垂点位与窗口的中心：<BR> <BR>
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<DIV>void CExoDraw1View::OnPaint() </DIV>
<DIV>{</DIV>
<DIV> CPaintDC dc(this); // 绘图的设备上下文</DIV>
<DIV> CRect Recto;</DIV>
<DIV> CPen PenBlue;</DIV>
<DIV> PenBlue.CreatePen(PS_SOLID, 1, RGB(0, 12, 255));</DIV>
<DIV> dc.SelectObject(&PenBlue);</DIV>
<DIV> dc.Ellipse(-100, -100, 100, 100);</DIV>
<DIV> CPen PenBlack;</DIV>
<DIV> PenBlack.CreatePen(PS_SOLID, 1, BLACK_PEN);</DIV>
<DIV> dc.SelectObject(&PenBlack);</DIV>
<DIV> // 得到客户区域的尺寸；</DIV>
<DIV> GetClientRect(&Recto);</DIV>
<DIV> dc.MoveTo(Recto.Width() / 2, 0);</DIV>
<DIV> dc.LineTo(Recto.Width() / 2, Recto.Height());</DIV>
<DIV> dc.MoveTo(0, Recto.Height() / 2);</DIV>
<DIV> dc.LineTo(Recto.Width(), Recto.Height() / 2);</DIV>
<DIV>}</DIV></TD></TR></TBODY></TABLE><BR></DIV>
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<DIV><IMG alt=基于VisualC++的GDI常用坐标系统及应用
src="基于Visual C++的GDI常用坐标系统及应用_1.files/866386425.gif"
border=1> </DIV> <B>图三、代码效果图</B></DIV></TD></TR></TBODY></TABLE></DIV><SPAN
id=_function_code_page>
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