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Box2D例子——Demo3自行车
package com.cvte.game; import com.badlogic.gdx.ApplicationAdapter; import com.badlogic.gdx.Gdx; import com.badlogic.gdx.Input.Keys; import com.badlogic.gdx.InputProcessor; import com.badlogic.gdx.graphics.GL20; import com.badlogic.gdx.graphics.OrthographicCamera; 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.physics.box2d.joints.DistanceJoint; import com.badlogic.gdx.physics.box2d.joints.DistanceJointDef; public class Demo3 extends ApplicationAdapter implements InputProcessor { private static final float PXTM = 80; protected OrthographicCamera mCamera; private Box2DDebugRenderer mRenderer; private World mWorld; private Body mBodyA; private Body mBodyB; private DistanceJoint mDistanceJoint; @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(20)); // // EdgeShape edgeShape = new EdgeShape(); // edgeShape.set(new Vector2(toWorldSize(0), toWorldSize(0)), new Vector2(toWorldSize(Gdx.graphics.getWidth()), toWorldSize(0))); // // FixtureDef fd = new FixtureDef(); // fd.shape = edgeShape; // // Body ground = mWorld.createBody(bd); // ground.createFixture(fd); // } // 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); } //ball { BodyDef bd = new BodyDef(); bd.type = BodyType.DynamicBody; bd.position.set(toWorldSize(400), toWorldSize(800)); CircleShape circleShape = new CircleShape(); circleShape.setRadius(toWorldSize(20)); FixtureDef fd = new FixtureDef(); fd.shape = circleShape; fd.density = 1; fd.restitution = 1; Body ball = mWorld.createBody(bd); ball.createFixture(fd); } createBodies(); createDistanceJoint(); Gdx.input.setInputProcessor(this); } @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); } private float toWorldSize(float pos) { return (pos / PXTM); } /** * 创建关节连接的两个刚体 */ private void createBodies() { Vector2 posA = new Vector2(toWorldSize(100), toWorldSize(100)); Vector2 posB = new Vector2(toWorldSize(200), toWorldSize(100)); { BodyDef bd = new BodyDef(); bd.type = BodyType.DynamicBody; bd.position.set(posA.x, posA.y); CircleShape circleShape = new CircleShape(); circleShape.setRadius(toWorldSize(30)); FixtureDef fd = new FixtureDef(); fd.shape = circleShape; fd.density = 1; fd.friction = 0.5f; fd.restitution = 0; mBodyA = mWorld.createBody(bd); mBodyA.createFixture(fd); } { BodyDef bd = new BodyDef(); bd.type = BodyType.DynamicBody; bd.position.set(posB.x, posB.y); CircleShape circleShape = new CircleShape(); circleShape.setRadius(toWorldSize(15)); FixtureDef fd = new FixtureDef(); fd.shape = circleShape; fd.density = 1; fd.friction = 0.5f; fd.restitution = 0; mBodyB = mWorld.createBody(bd); mBodyB.createFixture(fd); } } /** * 创建距离关节 */ private void createDistanceJoint() { DistanceJointDef djd = new DistanceJointDef(); djd.initialize(mBodyA, mBodyB, mBodyA.getPosition(), mBodyB.getPosition()); djd.collideConnected = true; mDistanceJoint = (DistanceJoint)mWorld.createJoint(djd); } @Override public boolean keyDown(int keycode) { if (keycode == Keys.LEFT) { mBodyA.setAngularVelocity(2f); } else if (keycode == Keys.RIGHT) { mBodyA.setAngularVelocity(-2f); } return false; } @Override public boolean keyUp(int keycode) { return false; } @Override public boolean keyTyped(char character) { return false; } @Override public boolean touchDown(int screenX, int screenY, int pointer, int button) { return false; } @Override public boolean touchUp(int screenX, int screenY, int pointer, int button) { return false; } @Override public boolean touchDragged(int screenX, int screenY, int pointer) { return false; } @Override public boolean mouseMoved(int screenX, int screenY) { return false; } @Override public boolean scrolled(int amount) { return false; } }
Box2D例子——Demo3自行车
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