Java tutorial
package com.barconr.games.marblegame; /* * Copyright 2011 Conor Byrne (conor@barconr.com) * * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language * governing permissions and limitations under the License. */ import com.badlogic.gdx.Gdx; import com.badlogic.gdx.Input.Peripheral; import com.badlogic.gdx.maps.tiled.TiledMap; import com.badlogic.gdx.maps.tiled.TiledMapTileLayer; 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.Box2DDebugRenderer; import com.badlogic.gdx.physics.box2d.CircleShape; import com.badlogic.gdx.physics.box2d.Contact; import com.badlogic.gdx.physics.box2d.ContactImpulse; import com.badlogic.gdx.physics.box2d.ContactListener; import com.badlogic.gdx.physics.box2d.Fixture; import com.badlogic.gdx.physics.box2d.FixtureDef; import com.badlogic.gdx.physics.box2d.Manifold; import com.badlogic.gdx.physics.box2d.PolygonShape; import com.badlogic.gdx.physics.box2d.World; import com.badlogic.gdx.physics.box2d.BodyDef.BodyType; public class Physics2D { private World world; private BodyDef playerBallBodyDef; private CircleShape dynamicCircle; private Body ballCircleBody; private Vector2 startPosition; private BallContactListener ballsListener; static final float BOX_STEP = 1 / 60f; static final int BOX_VELOCITY_ITERATIONS = 6; static final int BOX_POSITION_ITERATIONS = 2; Box2DDebugRenderer debugRenderer; Maze maze; public GameState game; boolean gameWon = false; public Physics2D() { game = new GameState(); } public void simulate() { if (!game.gameStarted()) { game.startGame(); } if (Gdx.input.isPeripheralAvailable(Peripheral.Accelerometer)) { world.setGravity(getAccel()); } world.step(BOX_STEP, BOX_VELOCITY_ITERATIONS, BOX_POSITION_ITERATIONS); } public void createFixtures(TiledMap tiledmap) { int layerHeight = 0, layerWidth = 0; float tileWidth = 0, tileHeight = 0; ballsListener = new BallContactListener(); // Load the Tiled map layer and store some relevant variables TiledMapTileLayer tilelayer = (TiledMapTileLayer) (tiledmap.getLayers().get(0)); layerHeight = tilelayer.getHeight(); layerWidth = tilelayer.getWidth(); maze = new Maze(layerWidth, layerHeight); tileHeight = tilelayer.getTileHeight(); tileWidth = tilelayer.getTileWidth(); System.out.println("Layer height (tiles) = " + layerHeight + " Layer width (tiles) = " + layerWidth + " Tile height = " + tileHeight + "tile width = " + tileWidth); System.out.println("Tile count = " + tilelayer.getObjects().getCount()); System.out.println("layer height pixels = " + (layerHeight * tileHeight) + "LAYER WIDTH PIXELS : " + (layerWidth * tileWidth)); //Create the box2d world world = new World(new Vector2(0, -9), true); world.setContactListener(ballsListener); // Loop through the grid reference for (int y_pos = 0; y_pos < layerHeight; y_pos++) { for (int x_pos = 0; x_pos < layerWidth; x_pos++) { boolean impassibleBlock = tilelayer.getCell(x_pos, layerHeight - y_pos - 1).getTile() .getProperties().containsKey("block"); // If the tile square contains the reference "start" // Store this as the start position if (tilelayer.getCell(x_pos, layerHeight - y_pos - 1).getTile().getProperties() .containsKey("start")) { if (startPosition == null) { System.out.println("x:" + x_pos * tileWidth + " y:" + y_pos * tileHeight); startPosition = new Vector2(x_pos * tileWidth * Assets.METERS_PER_PIXEL, (50 - y_pos) * tileHeight * Assets.METERS_PER_PIXEL); } } //Create a fixture for the end position if (tilelayer.getCell(x_pos, layerHeight - y_pos - 1).getTile().getProperties() .containsKey("end")) { //Draw box for fixture that is impassible PolygonShape squareShape = new PolygonShape(); BodyDef squareBodyDef = new BodyDef(); squareBodyDef.type = BodyType.StaticBody; //Static body which won't move //Box position squareBodyDef.position.set(new Vector2((x_pos * Assets.METERS_PER_PIXEL * tileWidth), (layerHeight - y_pos - 1) * Assets.METERS_PER_PIXEL * tileHeight)); //Correction for fact Box2Ds squares are half width/height from center point squareBodyDef.position.add(tileWidth / 2 * Assets.METERS_PER_PIXEL, tileHeight / 2 * Assets.METERS_PER_PIXEL); Body squareBody = world.createBody(squareBodyDef); squareShape.setAsBox(tileWidth / 2 * Assets.METERS_PER_PIXEL, tileHeight / 2 * Assets.METERS_PER_PIXEL); FixtureDef fixDefSquare = new FixtureDef(); fixDefSquare.shape = squareShape; fixDefSquare.isSensor = true; fixDefSquare.density = 0.1f; fixDefSquare.restitution = 0.3f; Fixture endFix = squareBody.createFixture(fixDefSquare); endFix.setSensor(true); endFix.setUserData("exit"); } if (impassibleBlock) { //Draw box for fixture that blocks maze.setMazeUnit(new MazeUnit("block"), x_pos, y_pos); //System.out.print("@"); // Draw ascii map in stdout } else { maze.setMazeUnit(new MazeUnit("passage"), x_pos, y_pos); } } //System.out.println(); } // The players ball playerBallBodyDef = new BodyDef(); playerBallBodyDef.type = BodyType.DynamicBody; if (startPosition == null) { playerBallBodyDef.position.set(3f, 3f); } else { playerBallBodyDef.position.set(startPosition.x, startPosition.y); } playerBallBodyDef.allowSleep = false; ballCircleBody = world.createBody(playerBallBodyDef); dynamicCircle = new CircleShape(); dynamicCircle.setRadius(8 / Assets.PIXELS_PER_METER); FixtureDef ballFixtureDef = new FixtureDef(); ballFixtureDef.shape = dynamicCircle; ballFixtureDef.density = 0.1f; ballFixtureDef.friction = 1f; //ballFixtureDef. ballFixtureDef.restitution = 0.5f; //ballCircleBody.setUserData("ball"); Fixture fx = ballCircleBody.createFixture(ballFixtureDef); fx.setUserData("ball"); maze.removeExtraBoxes(); /* PolygonShape squareShape = new PolygonShape(); */ for (int i = 0; i < maze.width; i++) { for (int j = 0; j < maze.height; j++) { if (maze.mazeUnits[j][i].getType().equals("block")) { BodyDef squareBodyDef = new BodyDef(); PolygonShape squareShape = new PolygonShape(); squareBodyDef.type = BodyType.StaticBody; //Static body which won't move //Box position squareBodyDef.position.set(new Vector2((j * Assets.METERS_PER_PIXEL * tileWidth), (layerHeight - i - 1) * Assets.METERS_PER_PIXEL * tileHeight)); //Correction for fact Box2Ds squares are half width/height from center point squareBodyDef.position.add(tileWidth / 2 * Assets.METERS_PER_PIXEL, tileHeight / 2 * Assets.METERS_PER_PIXEL); Body squareBody = world.createBody(squareBodyDef); //Size of box squareShape.setAsBox(tileWidth / 2 * Assets.METERS_PER_PIXEL, tileHeight / 2 * Assets.METERS_PER_PIXEL); FixtureDef fixDefSquare = new FixtureDef(); fixDefSquare.shape = squareShape; fixDefSquare.density = 0.1f; fixDefSquare.restitution = 0.3f; squareBody.createFixture(fixDefSquare); } } } } public Vector2 getPlayerBallLoc() { return ballCircleBody.getWorldCenter(); } private Vector2 getAccel() { return new Vector2(Gdx.input.getAccelerometerY() * 7, Gdx.input.getAccelerometerX() * -7); } public World getWorld() { return world; } boolean getWon() { return gameWon; } class BallContactListener implements ContactListener { @Override public void beginContact(Contact contact) { if (contact.getFixtureA() != null && contact.getFixtureB() != null) { if (contact.getFixtureA().getUserData() != null && contact.getFixtureB().getUserData() != null) { if (((String) contact.getFixtureA().getUserData()).equals("ball") && ((String) contact.getFixtureB().getUserData()).equals("exit")) { gameWon = true; } else if (((String) contact.getFixtureA().getUserData()).equals("exit") && ((String) contact.getFixtureB().getUserData()).equals("ball")) { gameWon = true; } } } } @Override public void endContact(Contact contact) { // TODO Auto-generated method stub } @Override public void preSolve(Contact contact, Manifold oldManifold) { // TODO Auto-generated method stub } @Override public void postSolve(Contact contact, ContactImpulse impulse) { // TODO Auto-generated method stub } } }