import objectdraw.*;

/**
 * A circle that falls vertically from a given point at a constant rate.
 */
public class FallingCircle extends ActiveObject {

    private static final int OVAL_SIZE = 20;

    private static final int FALL_SPEED = 1;

    private static final int PAUSE_MS = 10;

    private FilledOval oval;

    private double windowHeight;

    public FallingCircle(Location point, DrawingCanvas theCanvas) {
        oval = new FilledOval(point, OVAL_SIZE, OVAL_SIZE, theCanvas);
        windowHeight = theCanvas.getHeight();
        start();
    }

    public void run() {
        while (oval.getY() < windowHeight) {
            oval.move(0, FALL_SPEED);
            pause(PAUSE_MS);
        }
    }

}