繪制代碼；

void CDaocaView::OnDraw(CDC* pDC) {CDaocaDoc* pDoc = GetDocument();ASSERT_VALID(pDoc);// TODO: add draw code for native data hereCOLORREF DaoChaColor= RGB(0,0,0);int width = m_rect.Width() ;int height = m_rect.Height() ;CPen newpen(PS_SOLID,60,DaoChaColor);CPen newpen1(PS_SOLID,60,RGB(0,255,255));CPen *pOldPen = pDC->SelectObject(&newpen);pDC->MoveTo(m_rect.left,(int)(m_rect.top + height*0.5));pDC->LineTo((int)(m_rect.left +width*0.33),(int)(m_rect.top + height*0.5));pDC->MoveTo((int)(m_rect.left +width*0.33),(int)(m_rect.top+height*0.5));pDC->LineTo((int)(m_rect.left +width*0.5),(int)(m_rect.top+(height*0.5+width*(sqrt(3))/6)));pDC->MoveTo((int)(m_rect.left +width*0.67),(int)(m_rect.top + height*0.5));pDC->LineTo((int)(m_rect.left +width),m_rect.top+height*0.5);m_rect.left=240;m_rect.right=440;pDC->MoveTo(m_rect.left,(int)(m_rect.top + height*0.5));pDC->LineTo((int)(m_rect.left +width/3),(int)(m_rect.top + height*0.5));pOldPen = pDC->SelectObject(&newpen1);pDC->MoveTo((int)(m_rect.left +width/3),(int)(m_rect.top+height*0.5));pDC->LineTo((int)(m_rect.left +width*2/3),(int)(m_rect.top+height*0.5));pOldPen = pDC->SelectObject(&newpen);pDC->MoveTo((int)(m_rect.left +width*2/3),(int)(m_rect.top + height*0.5));pDC->LineTo((int)(m_rect.left +width),m_rect.top+height*0.5);m_rect.left=470;m_rect.right=670;pDC->MoveTo(m_rect.left,(int)(m_rect.top + height*0.5));pDC->LineTo((int)(m_rect.left +width/3),(int)(m_rect.top + height*0.5));pDC->MoveTo((int)(m_rect.left +width/3),(int)(m_rect.top+height*0.5));pDC->LineTo((int)(m_rect.left +width*0.5),(int)(m_rect.top+(height*0.5-width*(sqrt(3))/6)));pDC->MoveTo((int)(m_rect.left +width*2/3),(int)(m_rect.top + height*0.5));pDC->LineTo((int)(m_rect.left +width),m_rect.top+height*0.5);m_rect.left=700;m_rect.right=900;pDC->MoveTo(m_rect.left,(int)(m_rect.top + height*0.5));pDC->LineTo((int)(m_rect.left +width/3),(int)(m_rect.top + height*0.5));pDC->MoveTo((int)(m_rect.left +width/3),(int)(m_rect.top+height*0.5));pDC->LineTo((int)(m_rect.left +width/2),(int)(m_rect.top+(height*0.5+width*(sqrt(3))/6)));pDC->MoveTo((int)(m_rect.left +width*2/3),(int)(m_rect.top + height*0.5));pDC->LineTo((int)(m_rect.left +width),m_rect.top+height*0.5);pDC->SetBkMode(TRANSPARENT);pDC->SelectObject(pOldPen); }

頭文件添加一個成員變量：CRect m_rect;

初始化；

CDaocaView::CDaocaView() {// TODO: add construction code herem_rect.left=10;m_rect.top=10;m_rect.right=210;m_rect.bottom=210; }

包含<math.h>；

繪制效果如下；

? ? 我也不太了解什么是道岔；可能是指的鐵路交叉的地方；

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