SpaceshipSprite.java

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// This file is part of MicropolisJ.
// Copyright (C) 2013 Jason Long
// Portions Copyright (C) 1989-2007 Electronic Arts Inc.
//
// MicropolisJ is free software; you can redistribute it and/or modify
// it under the terms of the GNU GPLv3, with additional terms.
// See the README file, included in this distribution, for details.

package micropolisj.engine;

import micropolisj.gui.MainWindow;
import micropolisj.util.MP3;

public class SpaceshipSprite extends Sprite {
        private int destX;
        private int destY;
        private double speedFactor;
        private boolean soundPlaying;
        private MP3 sound;
        private int prevDist;

        // CONSTRUCTORS
        public SpaceshipSprite(Micropolis engine, int xpos, int ypos) {
                this(engine, xpos, ypos, 1.0);
        }

        public SpaceshipSprite(Micropolis engine, int xpos, int ypos, double speedFactor) {
                super(engine, SpriteKind.SPACESHIP);

                this.speedFactor = speedFactor;
                this.soundPlaying = false;
                this.prevDist = Integer.MAX_VALUE;
                x = xpos;
                y = ypos;

                // size of the sprite image in pixels
                this.width = 96;
                this.height = 96;

                this.offx = -48;
                this.offy = -48;

                MainWindow window = engine.mainWindow;

                // the 2 is indeed a magic number: it makes the spaceship vanish ~1sec
                // after flying off the map
                int diff = Math.max(window.getWidth() - xpos, window.getHeight() - ypos) * 2;

                destX = x + diff;
                destY = y + diff;

                frame = 1;
        }

        public void moveImpl() {
                // play sound
                if(!soundPlaying && speedFactor > 1.05) {
                        sound = new MP3(MainWindow.class.getResource("/sounds/" + Sound.SPACESHIP_LAUNCH.getWavName() + ".mp3"));
                        sound.play();
                        soundPlaying = true;
                }

                int dist = getDis(x, y, destX, destY);

                if(dist > prevDist) {
                        System.out.println("exploding spaceship");
                        remove();
                }

                prevDist = dist;

                this.x += 10 * speedFactor;
                this.y += 10 * speedFactor;
                speedFactor *= 1.03;
        }
}