void Line(int x1, int y1, int x2, int y2, int color)
{
    int dx = abs(x2-x1);
    int dy = abs(y2-y1);
    int sx = x2>=x1?1:-1;
    int sy = y2>=y1?1:-1;

    if(dy <= dx)
    {
        int d=(dy<<1)-dx;
        int d1=dy<<1;
        int d2=(dy-dx)<<1;
        putpixel(x1, y1, color);

        for(int x=x1+sx, y=y1, i=1; i<=dx; i++, x+=sx)
        {
            if(d>0)
            {
                d+=d2;
                y+=sy;
            }
            else d+=d1;
            putpixel(x, y, color);
        }
    }
    else
    {
        int d=(dx<<1)-dy;
        int d1=dx<<1;
        int d2=(dx-dy)<<1;

        putpixel(x1, y1, color);

        for(int x=x1,y=y1+sy,i=1;i<=dy;i++,y+=sy)
        {
            if(d>0)
            {
                d+=d2;
                x+=sx;
            }
            else d+=d1;
            putpixel(x, y, color);
        }
    }
}