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Box2d example -- a ball that cannot be stopped by demo2

Source: Internet
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package com.cvte.game;import com.badlogic.gdx.ApplicationAdapter;import com.badlogic.gdx.Gdx;import com.badlogic.gdx.InputProcessor;import com.badlogic.gdx.graphics.GL20;import com.badlogic.gdx.graphics.OrthographicCamera;import com.badlogic.gdx.graphics.Texture;import com.badlogic.gdx.graphics.g2d.Sprite;import com.badlogic.gdx.graphics.g2d.SpriteBatch;import com.badlogic.gdx.math.MathUtils;import com.badlogic.gdx.math.Vector2;import com.badlogic.gdx.physics.box2d.Body;import com.badlogic.gdx.physics.box2d.BodyDef;import com.badlogic.gdx.physics.box2d.BodyDef.BodyType;import com.badlogic.gdx.physics.box2d.Box2DDebugRenderer;import com.badlogic.gdx.physics.box2d.CircleShape;import com.badlogic.gdx.physics.box2d.EdgeShape;import com.badlogic.gdx.physics.box2d.FixtureDef;import com.badlogic.gdx.physics.box2d.World;import com.badlogic.gdx.utils.Array;public class Demo2 extends ApplicationAdapter implements InputProcessor {    private static final float PXTM = 80;protected OrthographicCamera mCamera;private Box2DDebugRenderer mRenderer;private World mWorld;private SpriteBatch mBatch;private Texture mTextureBall;private float mBallRadius;@Overridepublic void create() {        float cameraWidth = Gdx.graphics.getWidth() / PXTM;        float cameraHeight = Gdx.graphics.getHeight() / PXTM;mCamera = new OrthographicCamera(cameraWidth, cameraHeight);mCamera.position.set(cameraWidth / 2, cameraHeight / 2, 0);mCamera.update();mRenderer = new Box2DDebugRenderer();mWorld = new World(new Vector2(0, 0), true);//wall{BodyDef bd = new BodyDef();bd.type = BodyType.StaticBody;EdgeShape edgeShape = new EdgeShape();FixtureDef fd = new FixtureDef();fd.shape = edgeShape;Body box = mWorld.createBody(bd);edgeShape.set(new Vector2(toWorldSize(0), toWorldSize(0)), new Vector2(toWorldSize(Gdx.graphics.getWidth()), toWorldSize(0)));box.createFixture(fd);edgeShape.set(new Vector2(toWorldSize(Gdx.graphics.getWidth()), toWorldSize(0)), new Vector2(toWorldSize(Gdx.graphics.getWidth()), toWorldSize(Gdx.graphics.getHeight())));box.createFixture(fd);edgeShape.set(new Vector2(toWorldSize(Gdx.graphics.getWidth()), toWorldSize(Gdx.graphics.getHeight())), new Vector2(0, toWorldSize(Gdx.graphics.getHeight())));box.createFixture(fd);edgeShape.set(new Vector2(toWorldSize(0), toWorldSize(Gdx.graphics.getHeight())), new Vector2(0, toWorldSize(0)));box.createFixture(fd);}mTextureBall = new Texture(Gdx.files.internal("coin1.png"));mBatch = new SpriteBatch();Gdx.input.setInputProcessor(this);}@Overridepublic void dispose() {mCamera = null;mRenderer.dispose();mRenderer = null;mWorld.dispose();mWorld = null;mBatch = null;mTextureBall.dispose();mTextureBall = null;}@Overridepublic void render() {Gdx.gl.glClearColor(1, 1, 1, 1);Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);mWorld.step(Gdx.app.getGraphics().getDeltaTime(), 6, 2);mBatch.setProjectionMatrix(mCamera.combined);mBatch.begin();Array<Body> bodies = new Array<Body>();mWorld.getBodies(bodies);for (Body b : bodies) {Ball ball = (Ball)b.getUserData();if (ball != null) {ball.setPosition(b.getPosition().x, b.getPosition().y);ball.setRotation(MathUtils.radiansToDegrees * b.getAngle());ball.draw(mBatch);}}mBatch.end();}private float toWorldSize(float pos) {return (pos / PXTM);}private void addBall() {BodyDef bd = new BodyDef();bd.type = BodyType.DynamicBody;bd.position.set(toWorldSize(400), toWorldSize(800));mBallRadius = toWorldSize(20);CircleShape circleShape = new CircleShape();circleShape.setRadius(mBallRadius);FixtureDef fd = new FixtureDef();fd.shape = circleShape;fd.density = 1;fd.friction = 0;fd.restitution = 1;Body b = mWorld.createBody(bd);b.createFixture(fd);Vector2 force = new Vector2(100, 100);b.applyForce(force, bd.position, true);b.applyLinearImpulse(force, bd.position, true);Ball ball = new Ball(mTextureBall, mBallRadius);b.setUserData(ball);}@Overridepublic boolean keyDown(int keycode) {return false;}@Overridepublic boolean keyUp(int keycode) {return false;}@Overridepublic boolean keyTyped(char character) {return false;}@Overridepublic boolean touchDown(int screenX, int screenY, int pointer, int button) {addBall();return false;}@Overridepublic boolean touchUp(int screenX, int screenY, int pointer, int button) {return false;}@Overridepublic boolean touchDragged(int screenX, int screenY, int pointer) {return false;}@Overridepublic boolean mouseMoved(int screenX, int screenY) {return false;}@Overridepublic boolean scrolled(int amount) {return false;}public class Ball extends Sprite {public Ball(Texture texture, float radius) {super(texture);setSize(radius * 2, radius * 2);}}}



Box2d example -- a ball that cannot be stopped by demo2

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