import element.*;

public class MouseMeter
{
    public static void main(String args[])
    {
        DrawingWindow d = new DrawingWindow(500,500);
        double total = 0.0;
        Rect odometer = new Rect(0,0,150,20);
        Text dmsg = new Text(new Double(0.0));
        Pt p,q;

        odometer.center(d.bounds().center());
        d.draw(odometer);
        odometer.extend(-1,-1);
        dmsg.center(odometer.center());
        d.draw(dmsg);
        p = d.awaitMousePress();
        while (d.mousePressed())
        {
            q = d.getMouse();
            double dx = p.x()-q.x();
            double dy = p.y()-q.y();
            double distance = Math.sqrt((double)(dx*dx+dy*dy));
            //if (distance != 0.0)
            {
                total += distance;
                dmsg = new Text(new Double(total));
                dmsg.center(odometer.center());
                d.clear(odometer);
                d.draw(dmsg);
            }
            p = q;
        }
    }
}