1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.replica.replicaisland; 18 19 /** 20 * A game component that implements gravity. Adding this component to a game object will cause 21 * it to be pulled down towards the ground. 22 */ 23 public class GravityComponent extends GameComponent { 24 private Vector2 mGravity; 25 private Vector2 mScaledGravity; 26 private static final Vector2 sDefaultGravity = new Vector2(0.0f, -400.0f); 27 28 public GravityComponent() { 29 super(); 30 mGravity = new Vector2(sDefaultGravity); 31 mScaledGravity = new Vector2(); 32 setPhase(ComponentPhases.PHYSICS.ordinal()); 33 } 34 35 @Override 36 public void reset() { 37 mGravity.set(sDefaultGravity); 38 } 39 40 @Override 41 public void update(float timeDelta, BaseObject parent) { 42 mScaledGravity.set(mGravity); 43 mScaledGravity.multiply(timeDelta); 44 ((GameObject) parent).getVelocity().add(mScaledGravity); 45 } 46 47 public Vector2 getGravity() { 48 return mGravity; 49 } 50 51 public void setGravityMultiplier(float multiplier) { 52 mGravity.set(sDefaultGravity); 53 mGravity.multiply(multiplier); 54 } 55 } 56
