import uwcse.graphics.*; // access the graphics utilities in the uw library
import java.awt.Color; // access the Color class

/**
 * <p>
 * Create a spider in a graphics window
 * </p>
 * 
 * @author your name here
 */

public class Spider {

	// Your instance fields go here
	private int x, y;
	private double scale;
	private GWindow window;

	// Shape making up the spider
	private Oval body;

	// Vertical displacement of the spider
	private int dy = 15; // initially the spider moves down
	private boolean isMovingUp = false;
	

	/**
	 * Creates a spider centered at location (x,y) in the GWindow window. The
	 * size of the spider is the default size times scale.
	 */
	public Spider(int x, int y, double scale, GWindow window) {
		this.x = x;
		this.y = y;
		this.scale = scale;
		this.window = window;
		draw();
	}

	/**
	 * Draws in the graphics window a spider at location (x,y) with size =
	 * default size * scale
	 */
	private void draw() {
		int r = (int) (50 * scale);
		body = new Oval(x - r, y - r, 2 * r, 2 * r, Color.WHITE, true);
		window.add(body);
	}

	/**
	 * Moves the spider up and down
	 */
	public void move() {
		if (isMovingUp == true) {
			body.moveBy(0, -dy);
			y -= dy;
		}
		else {
			body.moveBy(0, dy);
			y += dy;
		}

		// is the spider at the bottom of the window?
		if (y > window.getWindowHeight()) {
			// go up
			isMovingUp = true;
		}

		// is the spider at the top of the window?
		if (y < 0) {
			// go down
			isMovingUp = false;
		}
	}
}