MSX Village forum

 
int myLine(char x1, char y1, char x2, char y2, char col) {
    int        x, y,i;
    int        dx, dy;
    int        incx, incy;
    int        balance;
 
    if (x2 >= x1)
    {
        dx = x2 - x1;
        incx = 1;
    }
    else
    {
        dx = x1 - x2;
        incx = -1;
    }
 
    if (y2 >= y1)
    {
        dy = y2 - y1;
        incy = 1;
    }
    else
    {
        dy = y1 - y2;
        incy = -1;
    }
 
    x = x1;
    y = y1;
 
    if (dx >= dy)
    {
        dy <<= 1;
        balance = dy - dx;
        dx <<= 1;
        i=0;
        while (x != x2)
        {
            Pset(x, y,col,0);
            i++;
            if (balance >= 0)
            {
                y += incy;
                balance -= dx;
            }
            balance += dy;
            x += incx;
        } 
        Pset(x, y, col,0);
    }
    else
    {
        dx <<= 1;
        balance = dx - dy;
        dy <<= 1;
        i=0;
        while (y != y2)
        {
            Pset(x, y, col,0);
            i++;
            if (balance >= 0)
            {
                x += incx;
                balance -= dy;
            }
            balance += dx;
            y += incy;
        } 
        Pset(x, y, col,0);
    }
 
    return (i);
}
 
 

 
    for(u8 i = 0; i < 100; i++)
        g_Frame = i;
 
    for(u8 j = 0; j < 100; ++j)
        g_Frame = j;
 
    u8 k = 0;
    do {
        g_Frame = k++;        
    } while(k < 100);