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绘制代码；
   
void CDaocaView::OnDraw(CDC* pDC){
    CDaocaDoc* pDoc = GetDocument();
    ASSERT_VALID(pDoc);
    // 画法待完成
    COLORREF 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);
}
   
头文件添加一个成员变量：CRect m_rect;
   
初始化；
   
CDaocaView::CDaocaView(){
    // 初始化成员变量
    m_rect.left=10;
    m_rect.top=10;
    m_rect.right=210;
    m_rect.bottom=210;
}
   
包含<math.h>；
   
绘制效果如下；
   
代码采用了几何计算方法绘制图形，主要包括菱形和直线的绘制。通过调整坐标点的位置，画出了具有特定角度的交叉图形。图形绘制采用了透明笔触模式，并通过改变颜色进行区分。绘制完成后，重设了窗口的位置和大小。
   
关于道岔的问题，这里指的是铁路交叉处的道岔结构。通过代码实现的绘制效果，展示了道岔的基本构造方式及其在不同位置的几何特性。
   

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