void draw_hp_bar(int hp, int maxhp)

int draw_colour_bar(int val, int max_val, int old_val, int old_disp,
    int ox, int oy, unsigned short default_colour,
    unsigned short change_colour, unsigned short empty_colour)

#define HPBAR_OX 20
#define HPBAR_OY 3
#define HPBAR_WIDTH (40-HPBAR_OX)

    const int width = crawl_view.hudsz.x - ox - 1;

    static int oldhp = 0;
    static int oldhx = 0;
    int cx;
    int hx = HPBAR_WIDTH * hp / maxhp;

    int disp = width * val / max_val;

    gotoxy(HPBAR_OX, HPBAR_OY, GOTO_STAT);

    gotoxy(ox, oy, GOTO_STAT);

    for (cx=0;cx<HPBAR_WIDTH;cx++)

    for (int cx=0; cx < width; cx++)

        textcolor(BLACK + DARKGRAY*16);

        textcolor(BLACK + empty_colour * 16);

        if (cx<hx)
            textcolor(BLACK + GREEN*16);
        else if (oldhp>hp && oldhx>hx && cx<oldhx && cx>=hx)
            textcolor(BLACK + RED*16);

        if (cx < disp)
            textcolor(BLACK + default_colour * 16);
        else if (old_val > val && old_disp > disp && cx < old_disp && cx >= val)
            textcolor(BLACK + change_colour * 16);

    oldhp=hp;
    oldhx=hx;

    return disp;
}
void draw_mp_bar(int val, int max_val)
{
    const int ox = 20;
    const int oy = 4;
    const unsigned short default_colour = BLUE;
    const unsigned short change = LIGHTBLUE;
    const unsigned short empty = DARKGRAY;
    static int old_val = 0;
    static int old_disp = 0;
    old_disp = draw_colour_bar(val, max_val, old_val, old_disp, ox, oy, 
        default_colour, change, empty);
    old_val = val;
}
void draw_hp_bar(int val, int max_val)
{
    const int ox = 20;
    const int oy = 3;
    const unsigned short default_colour = GREEN;
    const unsigned short change = RED;
    const unsigned short empty = DARKGRAY;
    static int old_val = 0;
    static int old_disp = 0;
    old_disp = draw_colour_bar(val, max_val, old_val, old_disp, ox, oy, 
        default_colour, change, empty);
    old_val = val;

#ifdef USE_TILE
        draw_mp_bar(you.magic_points, you.max_magic_points);
#endif