public abstract class animator
{
public bodypart bp;
public double steps;
public double start;
public double stop;
public double range;
public double i;
public static int max_steps;
    
public animator(bodypart p, int s, double stt, double stp)
    {
	bp    = p;
	steps = s;
	start = stt;
	stop  = stp;
	range = stop - start;
	i     = 1;
    }
    
public abstract void animate();
}