Track.java

/*
 * Copyright © 2012 Nokia Corporation. All rights reserved.
 * Nokia and Nokia Connecting People are registered trademarks of Nokia Corporation.
 * Oracle and Java are trademarks or registered trademarks of Oracle and/or its
 * affiliates. Other product and company names mentioned herein may be trademarks
 * or trade names of their respective owners.
 * See LICENSE.TXT for license information.
 */
package com.nokia.example.racer.views.components;

import com.nokia.example.racer.helpers.ImageLoader;
import com.nokia.example.racer.views.tracks.LapListener;
import java.io.IOException;
import java.util.Vector;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

public class Track {

    private Vector gates; // gates which car must pass to get a lap driven
    private Image track;
    private Gate currentGate = null;
    private int currentGateIndex = 0;
    /*
     * screen relative coordinates
     */
    private int x;
    private int y;
    private int laps = 0; // laps driven
    private LapListener listener;
    private int width;
    private int height;
    /*
     * track relative coordinates for starting point of the car
     */
    private int carStartX = 0;
    private int carStartY = 0;
    private int carStartFrame = 0;

    public Track(LapListener listener) {
        this.listener = listener;
        gates = new Vector();
    }

    /**
     * Loads the image at imagePath and sets it for the track
     *
     * @param imagePath Path to the image
     */
    public void setTrack(String imagePath) {
        try {
            track = ImageLoader.getInstance().loadImage(imagePath);
            width = track.getWidth();
            height = track.getHeight();
        }
        catch (IOException e) {
        }
    }

    /**
     * Renders the track and its gates.
     *
     * @param g Graphics object
     */
    public void render(Graphics g) {
        g.drawImage(track, x, y, g.TOP | g.LEFT);
        for (int i = 0; i < gates.size(); i++) {
            ((Gate) gates.elementAt(i)).render(g);
        }
    }

    /**
     * Sets position of the track relative to screen
     *
     * @param x x coordinate of the position
     * @param y y coordinate of the position
     */
    public void setPosition(int x, int y) {
        this.x = x;
        this.y = y;
    }

    /**
     * Add gates to track. The last gate added will also be the last gate
     * required to pass
     *
     * @param gate Gate to be added
     */
    public void addGate(Gate gate) {
        gates.addElement(gate);
    }

    /**
     * Checks if the given point (car) is near enough next gate to mark it
     * passed. If all gates are passed, they are all reseted (set to non-passed)
     *
     * @param x x coordinate of the point
     * @param y y coordinate of the point
     */
    public void checkGatePass(int x, int y) {
        if (currentGate == null) {
            currentGate = (Gate) gates.elementAt(currentGateIndex);
        }
        if (currentGate.isPointNear(x, y)) {
            currentGate.setPassed(true);
            currentGateIndex++;
            if (currentGateIndex > gates.size() - 1) {
                laps++;

                listener.lapDriven(laps);

                currentGateIndex = 0;

                /*
                 * set the last gate passed for a moment before resetting
                 */
                new Thread() {

                    public void run() {
                        try {
                            sleep(500);
                        }
                        catch (InterruptedException e) {
                        }
                        resetGates();
                    }
                }.start();
            }
            currentGate = (Gate) gates.elementAt(currentGateIndex);
        }
    }

    /**
     * Sets all gates non-passed.
     */
    public void resetGates() {
        for (int i = 0; i < gates.size(); i++) {
            ((Gate) gates.elementAt(i)).setPassed(false);
        }
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    public int getLaps() {
        return laps;
    }

    public void resetLaps() {
        laps = 0;
        currentGate = (Gate) gates.firstElement();
    }

    public int getHeight() {
        return height;
    }

    public void setHeight(int height) {
        this.height = height;
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }

    public Image getTrackImage() {
        return track;
    }

    /**
     * Sets the point where car is positioned in the beginning of this track
     *
     * @param x x coordinate of the point
     * @param y y coordinate of the point
     */
    public void setCarStartPosition(int x, int y) {
        this.carStartX = x;
        this.carStartY = y;
    }

    public int getCarStartFrame() {
        return carStartFrame;
    }

    public void setCarStartFrame(int carStartFrame) {
        this.carStartFrame = carStartFrame;
    }

    public int getCarStartX() {
        return carStartX;
    }

    public int getCarStartY() {
        return carStartY;
    }
}