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画矩形的类别</p>
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</font><p><font SIZE="2"></font><font color="#FF0000" SIZE="2">·03-05 CRectangle类别定义及实作
画矩形的类别</font></p><font SIZE="2">
<p>class CRectangle : public CShape</p>
<p>{</p>
<p> public:</p>
<p> POINT m_ptMove;</p>
<p> POINT m_ptOrigin;</p>
<p> public:</p>
<p> CRectangle(TCanvas* pCanvas):CShape(pCanvas)
{}</p>
<p> virtual ~CRectangle() {}</p>
<p> virtual void OnMouseMove(int,int);</p>
<p> virtual void OnMouseDown(int,int);</p>
<p> virtual void OnMouseUp(int,int);</p>
<p>};</p>
<p>画矩形类别其实和画线类别有些类似，它们同样必须记载上次滑鼠移动的点，并擦掉原来的图形画出新的图形，所以我只针对其相异的部份加以说明之：</p>
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<p><font SIZE="2"><font SIZE="2">// </font>滑鼠移动事件处理函式</font></p>
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<p>// 原理和CLine类似，只不过改成画矩形。</p>
<p>void CRectangle::OnMouseMove(int x,int y)</p>
<p>{</p>
<p> m_pCanvas->Pen->Mode = pmXor;</p>
<p>
m_pCanvas->Rectangle(m_ptOrigin.x,m_ptOrigin.y,m_ptMove.x,m_ptMove.y);</p>
<p> m_ptMove.x = x;</p>
<p> m_ptMove.y = y;</p>
<p>
m_pCanvas->Rectangle(m_ptOrigin.x,m_ptOrigin.y,m_ptMove.x,m_ptMove.y);</p>
<p> m_pCanvas->Pen->Mode = pmCopy;</p>
<p>}</p>
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画矩形的类别</p>
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