GamePlay.java

package screens;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Input;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.*;
import com.santivaldez.ropistgame.entities.Rope;

/**
 * Created by SantiValdez on 10-Aug-16.
 */
public class GamePlay implements Screen{

    private OrthographicCamera cam;

    private Box2DDebugRenderer debugRenderer;
    private World world;
    private Body playerBody;
    private Body ceilingBody;
    private Rope rope;

    @Override
    public void show() {
        world = new World(new Vector2(0, -9.81f), true);
        cam = new OrthographicCamera();
        debugRenderer = new Box2DDebugRenderer();

        rope = new Rope(world);

        BodyDef bdef = new BodyDef();
        FixtureDef fdef = new FixtureDef();

        //bodydef
        bdef.type = BodyDef.BodyType.StaticBody;
        bdef.position.set(0, 2.4f);

        //shape
        PolygonShape ceilingShape = new PolygonShape();
        ceilingShape.setAsBox(15, 0.25f);

        //fixturedef
        fdef.shape = ceilingShape;

        //create it
        ceilingBody = world.createBody(bdef);
        ceilingBody.createFixture(fdef);

        bdef.position.set(0, -10);
        world.createBody(bdef).createFixture(fdef); // TEMPORARY FLOOR

        //reuse for player
        bdef.type = BodyDef.BodyType.DynamicBody;
        bdef.position.set(-5, 1.5f);

        CircleShape playerShape = new CircleShape();
        playerShape.setRadius(0.15f); //half

        fdef.shape = playerShape;
        fdef.density = 0.1f;
        fdef.restitution = 0.5f;
        fdef.friction = 0.2f;

        playerBody = world.createBody(bdef);
        playerBody.createFixture(fdef);

        rope.create(ceilingBody, playerBody, 10);
    }

    @Override
    public void render(float delta) {
        Gdx.gl.glClearColor(0f, 0.4f, 0.7f, 1f);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);



        world.step(1f / 60f, 8, 3);
        cam.update();
        debugRenderer.render(world, cam.combined);

        if(Gdx.input.isKeyPressed(Input.Keys.SPACE)){
            playerBody.applyLinearImpulse(0.008f, 0.008f, 0, 0, true);
            //world.destroyBody(playerBody);
            if(!world.isLocked()) {
                rope.destroyRope();
            }
        }
    }

    @Override
    public void dispose() {
        world.dispose();
        debugRenderer.dispose();
    }

    @Override
    public void pause() {}

    @Override
    public void resize(int width, int height) {
        cam.viewportWidth = width / 100;    // 1pixel >> 100m pixel ratio
        cam.viewportHeight = height / 100;
    }

    @Override
    public void resume() {}

    @Override
    public void hide() {}
}