直线的扫描转换

void CMy1400801119View::OnDraw(CDC* pDC){    CMy1400801119Doc* pDoc = GetDocument();    ASSERT_VALID(pDoc);    // TODO: add draw code for native data here    CPen NewPen,*pOldPen;    NewPen.CreatePen(PS_SOLID,2,RGB(20,180,29));    pOldPen=pDC->SelectObject(&NewPen);    int x0=65,y0=12,x1=400,y1=450;    int x,y,dx,dy,e,i;    dx=x1-x0;    dy=y1-y0;    e=dx-2*dy;    x=x0;    y=y0;    for(i=0;i<=dx;i+=10){        pDC->MoveTo(x,y);        x=x+10;        if(e<=0){            y=y+10;            e=e+2*dx-2*dy;        }        else            e=e-2*dy;        pDC->LineTo(x,y);    }}