简单DDA算法

原理

dydx=常数 或者 ΔyΔx=y2−y1x2−x1

yi+1=yi+Δy
yi+1=yi+y2−y1x2−x1Δx

代码

void DDALine(int x0,int y0,int x1,int y1)
{
    HWND myconsole = GetConsoleWindow();
    HDC mydc = GetDC(myconsole);
    COLORREF COLOR= RGB(255,0,0);
    int dx,dy,epsl,k;
    float x,y,xIncre,yIncre;
    dx=x1-x0;
    dy=y1-y0;
    x=x0;
    y=y0;
    if(abs(dx)>abs(dy)) epsl=abs(dx);
    else epsl=abs(dy);
    xIncre=(float)dx/(float)epsl;
    yIncre=(float)dy/(float)epsl;
    for(k=0;k<=epsl;k++){
        SetPixel(mydc,int(x+0.5),int(y+0.5),COLOR);
        x+=xIncre;
        y+=yIncre;
    }
    ReleaseDC(myconsole, mydc);
    cin.ignore();
}