SEM6: CG DDA

void DDA(float x1,float y1, float x2, float y2, CDC* pDC, COLORREF color)
{
    /*COLORREF SetPixel( int x,  int y,  COLORREF crColor )*/
    float dx,dy,x_inc,y_inc,x,y;
    x=x1;
    y=y1;
    dx=(x2-x1);
    dy=(y2-y1);

    int step;
    if(abs(dx)>abs(dy))
        step=abs(dx);
    else
        step=abs(dy);

    x_inc=dx/step;
    y_inc=dy/step;

    pDC->SetPixel(round(x),round(y),color);


    for(int i=1; i<=step;i++)
    {
        x+=x_inc;
        y+=y_inc;
        Sleep(0);
        pDC->SetPixel(round(x),round(y),color);
    }


}





// CCG_EXPT2View drawing

void CCG_EXPT2View::OnDraw(CDC* pDC)
{
    CCG_EXPT2Doc* pDoc = GetDocument();
    ASSERT_VALID(pDoc);
    if (!pDoc)
        return;

    DDA(300,300,500,300,pDC,RGB(0,255,255));
    DDA(300,200,500,200,pDC,RGB(0,255,255));
    DDA(300,200,400,350,pDC,RGB(0,255,255));

    DDA(400,350,500,200,pDC,RGB(0,255,255));
    DDA(300,300,400,150,pDC,RGB(0,255,255));
    DDA(500,300,400,150,pDC,RGB(0,255,255));


}