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Box2D例子——Demo1掉落的小球
<pre name="code" class="java">package com.cvte.game; import com.badlogic.gdx.ApplicationAdapter; import com.badlogic.gdx.Gdx; import com.badlogic.gdx.graphics.GL20; import com.badlogic.gdx.graphics.OrthographicCamera; import com.badlogic.gdx.graphics.Texture; import com.badlogic.gdx.graphics.g2d.SpriteBatch; 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; public class Demo1 extends ApplicationAdapter { private static final float PXTM = 80; protected OrthographicCamera mCamera; private Box2DDebugRenderer mRenderer; private World mWorld; private Body mBall; private Texture mTextureBall; private SpriteBatch mBatch; private float mBallRadius; @Override public 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, -10), true); //ground { BodyDef bd = new BodyDef(); bd.type = BodyType.StaticBody; bd.position.set(toWorldSize(0), toWorldSize(100)); EdgeShape edgeShape = new EdgeShape(); edgeShape.set(new Vector2(toWorldSize(0), toWorldSize(80)), new Vector2(toWorldSize(Gdx.graphics.getWidth()), toWorldSize(80))); FixtureDef fd = new FixtureDef(); fd.shape = edgeShape; Body ground = mWorld.createBody(bd); ground.createFixture(fd); } //ball { 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.restitution = 0.9f; mBall = mWorld.createBody(bd); mBall.createFixture(fd); mTextureBall = new Texture(Gdx.files.internal("coin1.png")); mBall.setUserData(mTextureBall); } mBatch = new SpriteBatch(); } @Override public void dispose() { mRenderer.dispose(); mWorld.dispose(); mCamera = null; } @Override public 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); // mRenderer.render(mWorld, mCamera.combined); mBatch.setProjectionMatrix(mCamera.combined); mBatch.begin(); mBatch.draw(mTextureBall, mBall.getPosition().x - mBallRadius, mBall.getPosition().y - mBallRadius, mBallRadius * 2, mBallRadius * 2); mBatch.end(); } private float toWorldSize(float pos) { return (pos / PXTM); } }
Box2D例子——Demo1掉落的小球
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