Thread: Bresenham Circle Algorithm

Does anyone have experience with this algo.. i can't seem to get it working right (i converted the code i found on gamedev from pascal to c++)?

Code:

	
PHP Code:
	

    int d,mx,my;

    d = 3 - (2*radius);
    mx = 0;
    my = radius;

    while(my != mx)
    {
        DrawPixel(surface,x+mx,y+my,color);
        DrawPixel(surface,x+mx,y-my,color);
        DrawPixel(surface,x-mx,y+my,color);
        DrawPixel(surface,x-mx,y-my,color);
        DrawPixel(surface,x+my,y+mx,color);
        DrawPixel(surface,x+my,y-mx,color);
        DrawPixel(surface,x-my,y+mx,color);
        DrawPixel(surface,x-my,y-mx,color);

        if(d < 0)
            d += (4*mx)+6;    
        else
        {
            d += 4*(mx-my) + 10;
            my--;
        }
    } 

edit: It is drawing a + sign rather than an O.. I'm trying to figure this one out but so far no luck.