progressbar

#include <SDL/SDL.h>
#include <cstdlib>
using namespace std;

class MyInt
{
public:
    MyInt(unsigned var, unsigned maxvalue = 100):
        var(var),
        maxvalue(maxvalue)
    {
        ;
    }

    operator unsigned()
    {
        return var;
    }

    MyInt operator+(const MyInt& m) const
    {
        unsigned tmp = var + m.var;
        while(tmp > maxvalue) tmp -= maxvalue;
        return MyInt(tmp);
    }

    MyInt& operator++()
    {
        if((++var) >= maxvalue)
            var = 0;
        return *this;
    }

    bool operator<(const MyInt& m) const
    {
        return var < m.var;
    }

    bool operator>(const MyInt& m) const
    {
        return var > m.var;
    }

private:
    unsigned var;
    const unsigned maxvalue;
};

class ProgressBar
{
public:
    ProgressBar(unsigned len, unsigned width,
                unsigned height, unsigned colorfg,
                unsigned colorbg):
        len(len),
        width(width),
        height(height),
        posx(0, len),
        posy(0),
        colorfg(colorfg),
        colorbg(colorbg)
    {
        ;
    }

    void run()
    {
        while(true)
        {
            drawRect(0, 0, len, height, colorbg);

            MyInt tmpx = posx + (MyInt)width;
            if(posx > tmpx)
            {
                drawRect(posx, posy, len-(unsigned)posx, height, colorfg);
                drawRect(0, posy, tmpx, height, colorfg);
            }
            else
            {
                drawRect(posx, posy, width, height, colorfg);
            }
            SDL_Flip(SDL_GetVideoSurface());
            ++posx;
            SDL_Delay(50);
        }
    }

private:
    void drawRect(MyInt x, MyInt y, unsigned w, unsigned h, unsigned color)
    {
        SDL_Rect r;
        r.w = w;
        r.h = h;
        r.x = x;
        r.y = y;

        SDL_Surface* screen = SDL_GetVideoSurface();

        SDL_FillRect(screen, &r, color);
    }

private:
    const unsigned len;
    const unsigned width;
    const unsigned height;
    MyInt posx;
    MyInt posy;
    unsigned colorfg;
    unsigned colorbg;
};

int main()
{
    if(SDL_Init(SDL_INIT_VIDEO) < 0)
    {
        return -1;
    }

    atexit(SDL_Quit);

    if(!SDL_SetVideoMode(320, 32, 32, SDL_HWSURFACE))
    {
        return -1;
    }

    ProgressBar MPB(320, 32, 32, 0x00FF00, 0x0000);
    MPB.run();

    return 0;
}