使用當前版本的API，我對太空侵略者的評價不到175個LOC。 我的API中有很多“功能接口”，可以使用JavaFX 8（例如SpriteProvider和CollisionHandler）將其轉換為Lambda表達式。 這將使代碼更好，更短。 我可能還可以通過捆綁資源（例如TileSets）并創建更多工廠和構建器（SpriteBuilder）來減少行數。 但是我越來越接近我想要的……

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);}} }

這是游戲的視頻：

參考： JavaFX：我們的JCG合作伙伴 Toni Epple在Eppleton博客上以不到175 LOC的價格入侵了太空 。

翻譯自: https://www.javacodegeeks.com/2013/02/javafx-space-invaders-in-less-than-175-loc.html

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