/**
 * BasicVehicle.java
 *
 * @author Zuo Yan
 * @version 1.0
 */

package vehicle;

import java.awt.Graphics2D;
import java.awt.Color;
import java.awt.Shape;
import java.awt.Polygon;
import java.awt.geom.Rectangle2D;
import java.awt.geom.Ellipse2D;

import world.World;

/**
 * Basic Vehicle implementation.<p>
 * 
 * This is a very simple vehicle that demostrates how to create
 * and draw shapes onto the world. In addition, movement controls
 * are handled by the keyboard arrows.<br>
 * Left arrow key - Turn counterclockwise<br>
 * Right arrow key - Turn clockwise<br>
 * Up arrow key - Move forward<br>
 * Down arrow key - Move backward
 */
public class BasicVehicle extends AbstractVehicle {
    // shapes used to draw the vehicle
    private Shape body;
    private Shape head;
    private Shape tail;
    
    /**
     * Create a very simple movement vehicle
     * 
     * @param world the World this vehicle is in
     */
    public BasicVehicle(World aWorld) {
        super(aWorld);
        createShapes();
    }

    /**
     * Called by World when it's time to update.
     * Checks for button presses, rotating and moving appropriately
     */
    public void update() {
        if (this.theWorld.getKeyPressed(World.KEY_RIGHT))
            rotateBy(.1);
        if (this.theWorld.getKeyPressed(World.KEY_LEFT))
            rotateBy(-.1);
        if (this.theWorld.getKeyPressed(World.KEY_UP)) {
            double x = 2.0*Math.cos(mvTrack.getOrientation());
            double y = 2.0*Math.sin(mvTrack.getOrientation());
            moveBy(x,y);
        }
        if (this.theWorld.getKeyPressed(World.KEY_DOWN)) {
            double x = 2.0*Math.cos(mvTrack.getOrientation());
            double y = 2.0*Math.sin(mvTrack.getOrientation());
            moveBy(-x,-y);
        }

    }
    
    /**
     * Create all our shapes representing this vehicle.
     * This method is calleteh constructor.
     */
    public void createShapes() {
        // create a rectangle for the body
        body = new Rectangle2D.Double(0, 0, 16, 6);
        
        // a circle at the front
        head = new Ellipse2D.Double(13, 0, 6, 6);

        // a triangle at the end
        Polygon t = new Polygon();
        t.addPoint(2, 2);
        t.addPoint(8, 2);
        t.addPoint(2, -7);
        tail = t;
    
        // need to register all shapes with the tracker
        mvTrack.registerShape(body);
        mvTrack.registerShape(head);
        mvTrack.registerShape(tail);
    }
    
    /**
     * Use the graphics system to actually paint the shapes
     * we have created.
     * 
     * @param g the graphics system to use
     */
    public void draw(Graphics2D g) {
        // Color in body and front to be blue
        g.setPaint(Color.blue);
        g.fill(body);
        g.fill(head);
        
        // Make the outline of the body and front black
        g.setPaint(Color.black);
        g.draw(body);
        g.draw(head);

        // The end triangle is all red
        g.setPaint(Color.red);
        g.fill(tail);
        g.draw(tail);
    }
}