Cannon.java

package lab;

import javafx.geometry.Point2D;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.paint.Color;
import javafx.scene.transform.Affine;
import javafx.scene.transform.Transform;

public class Cannon {

	private static final double LENGTH = 60;
	private static final double WIDTH = 15;
	private final World world;
	private Point2D position;
	private double angle;
	private double angleDelta = -25;

	public Cannon(World world, Point2D position, double angle) {
		this.world = world;
		this.position = position;
		this.angle = angle;
	}

	public void draw(GraphicsContext gc) {
		gc.save();
		gc.transform(new Affine(Transform.rotate(angle, position.getX(), position.getY() + WIDTH / 2)));
		gc.setFill(Color.BROWN);
		gc.fillRect(position.getX(), position.getY(), LENGTH, WIDTH);
		gc.restore();
	}

	public void simulate(double deltaT) {
		// do nothing yet
		angle += angleDelta * deltaT;
		if (angle >= 0 || angle <= -90) {
			angleDelta = -angleDelta;
		}
	}
}