JavaFX：太空侵略者在175 LOC以下

使用当前版本的API，我对太空侵略者的评价不到175个LOC。我的API中有很多“功能接口”，可以使用JavaFX 8（例如SpriteProvider和CollisionHandler）将其转换为Lambda表达式。这将使代码更好，更短。我可能还可以通过捆绑资源（例如TileSets）并创建更多工厂和构建器（SpriteBuilder）来减少行数。但是我越来越接近我想要的……

package de.eppleton.fx2d.samples.spaceinvaders;import de.eppleton.fx2d.collision.*;
import de.eppleton.fx2d.*;
import de.eppleton.fx2d.action.*;
import de.eppleton.fx2d.tileengine.*;
import java.util.Collection;
import java.util.logging.*;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.scene.canvas.*;
import javafx.scene.input.*;
import javafx.scene.media.*;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javax.xml.bind.JAXBException;
import org.openide.util.Lookup;
import org.openide.util.lookup.Lookups;public class SpaceInvaders extends Game {Points TEN = new Points(10);Points TWENTY = new Points(30);Points THIRTY = new Points(40);DoubleProperty invaderXVelocity = new SimpleDoubleProperty(0.3);AudioClip shootSound = new AudioClip(SpaceInvaders.class.getResource('/assets/sound/shoot.wav').toString());AudioClip invaderKilledSound = new AudioClip(SpaceInvaders.class.getResource('/assets/sound/invaderkilled.wav').toString());MediaPlayer mediaPlayer = new MediaPlayer(new Media(SpaceInvaders.class.getResource('/assets/sound/invader_loop1.mp3').toString()));int score = 0;String message;int[][] enemies = new int[][]{{30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30},{20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20},{20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20},{10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10},{10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10}};@Overrideprotected void initGame() {final GameCanvas canvas = getCanvas();try {TileSet invaders = TileMapReader.readSet('/assets/graphics/invaders1.tsx');TileSet playerTiles = TileMapReader.readSet('/assets/graphics/player.tsx');final TileSetAnimation animation30 = new TileSetAnimation(invaders, new int[]{0, 1}, 2);final TileSetAnimation animation10 = new TileSetAnimation(invaders, new int[]{4, 5}, 2);final TileSetAnimation animation20 = new TileSetAnimation(invaders, new int[]{2, 3}, 2);final TileSetAnimation playerAnimation = new TileSetAnimation(playerTiles, new int[]{0}, 100_000);for (int i = 0; i < enemies.length; i++) {int[] is = enemies[i];for (int j = 0; j < is.length; j++) {Points points = is[j] == 30 ? THIRTY : is[j] == 20 ? TWENTY : TEN;Sprite sprite = new Sprite(canvas, '' + ((j * 11) + i), 50 + (40 * j), 140 + (40 * i), 30, 20, Lookups.fixed(points));sprite.setAnimation(is[j] == 30 ? animation30 : is[j] == 20 ? animation20 : animation10);sprite.setVelocityXProperty(invaderXVelocity);}}Sprite player = new Sprite(canvas, playerAnimation, 'Player', 350, 620, 40, 30, Lookup.EMPTY);player.setAnimation(playerAnimation);player.addAction(KeyCode.LEFT, ActionFactory.createMoveAction(playerAnimation, 'left', -4, 0, 0, 0));player.addAction(KeyCode.RIGHT, ActionFactory.createMoveAction(playerAnimation, 'right', 4, 0, 0, 0));player.addAction(KeyCode.UP, new ShootAction(playerAnimation, 'fire', new BulletProvider(), new HitHandler(), shootSound));} catch (JAXBException ex) {Logger.getLogger(SpaceInvaders.class.getName()).log(Level.SEVERE, null, ex);}canvas.addLayer(new Background());canvas.addBehaviour(new MoveInvadersBehavior());mediaPlayer.setCycleCount(MediaPlayer.INDEFINITE);mediaPlayer.play();canvas.addLayer(new SpriteLayer());canvas.start();}@Overrideprotected double getViewPortWidth() {return 700;}@Overrideprotected double getViewPortHeight() {return 700;}public static void main(String[] args) {launch(args);}private class Points {int points;public Points(int points) {this.points = points;}public int getPoints() {return points;}}static class BulletProvider implements SpriteProvider {@Overridepublic Sprite getSprite(GameCanvas parent, double x, double y) {return new Sprite(parent, 'bullet', x, y + 10, 10, 20, Lookup.EMPTY);}}class HitHandler implements CollisionHandler {@Overridepublic void handleCollision(Collision collision) {Points points = collision.getSpriteTwo().getLookup().lookup(Points.class);if (points != null) {score += points.getPoints();invaderKilledSound.play();collision.getSpriteOne().remove();collision.getSpriteTwo().remove();}}}class MoveInvadersBehavior extends Behavior {@Overridepublic boolean perform(GameCanvas canvas, long nanos) {Collection<Sprite> sprites = canvas.getSprites();boolean stop = false;boolean win = true;for (Sprite sprite1 : sprites) {if (sprite1.getLookup().lookup(Points.class) != null) {win = false;if (sprite1.getX() > 650 || sprite1.getX() < 50) {invaderXVelocity.set(-invaderXVelocity.doubleValue() * (stop ? 0 : 1.3));if (sprite1.getY() >= 600) {message = 'Game Over!';stop = true;mediaPlayer.stop();}for (Sprite sprite2 : sprites) {if (sprite2.getLookup().lookup(Points.class) != null) {sprite2.setY(sprite2.getY() + (stop ? 0 : 20));}}break;}}}if (win) {message = 'You win!';canvas.stop();mediaPlayer.stop();}return true;}}class Background extends Layer {        @Overridepublic void draw(GraphicsContext graphicsContext, double x, double y, double width, double height) {graphicsContext.setFill(Color.BLACK);graphicsContext.fillRect(0, 0, width, height);graphicsContext.setFill(Color.WHITE);graphicsContext.setFont(Font.font('OCR A Std', 20));graphicsContext.fillText('SCORE<1>    HI-SCORE    SCORE<2>', 30, 30);graphicsContext.fillText('' + score + '            9990   ', 30, 60);graphicsContext.fillText(message, 300, 400);graphicsContext.fillText('' + 3 + '                   CREDIT ' + 1, 30, 680);graphicsContext.setFill(Color.GREEN);graphicsContext.fillRect(30, 650, 640, 4);}}
}

这是游戏的视频：

参考： JavaFX：我们的JCG合作伙伴 Toni Epple在Eppleton博客上以不到175 LOC的价格入侵了太空。