1cfd74d65d832137e20e193c960802afba73b5d38sm/* 23c1e67e433728684b5f228c5d4f3e5b1457bb271sm * Copyright (C) 2010 The Android Open Source Project 3cfd74d65d832137e20e193c960802afba73b5d38sm * 4cfd74d65d832137e20e193c960802afba73b5d38sm * Licensed under the Apache License, Version 2.0 (the "License"); 5cfd74d65d832137e20e193c960802afba73b5d38sm * you may not use this file except in compliance with the License. 6cfd74d65d832137e20e193c960802afba73b5d38sm * You may obtain a copy of the License at 7cfd74d65d832137e20e193c960802afba73b5d38sm * 8cfd74d65d832137e20e193c960802afba73b5d38sm * http://www.apache.org/licenses/LICENSE-2.0 9cfd74d65d832137e20e193c960802afba73b5d38sm * 10cfd74d65d832137e20e193c960802afba73b5d38sm * Unless required by applicable law or agreed to in writing, software 11cfd74d65d832137e20e193c960802afba73b5d38sm * distributed under the License is distributed on an "AS IS" BASIS, 12cfd74d65d832137e20e193c960802afba73b5d38sm * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13cfd74d65d832137e20e193c960802afba73b5d38sm * See the License for the specific language governing permissions and 14cfd74d65d832137e20e193c960802afba73b5d38sm * limitations under the License. 15cfd74d65d832137e20e193c960802afba73b5d38sm */ 16cfd74d65d832137e20e193c960802afba73b5d38sm 17cfd74d65d832137e20e193c960802afba73b5d38smpackage com.replica.replicaisland; 18cfd74d65d832137e20e193c960802afba73b5d38sm 19cfd74d65d832137e20e193c960802afba73b5d38sm/** 20cfd74d65d832137e20e193c960802afba73b5d38sm * A game component that implements gravity. Adding this component to a game object will cause 21cfd74d65d832137e20e193c960802afba73b5d38sm * it to be pulled down towards the ground. 22cfd74d65d832137e20e193c960802afba73b5d38sm */ 23cfd74d65d832137e20e193c960802afba73b5d38smpublic class GravityComponent extends GameComponent { 24cfd74d65d832137e20e193c960802afba73b5d38sm private Vector2 mGravity; 25cfd74d65d832137e20e193c960802afba73b5d38sm private Vector2 mScaledGravity; 26cfd74d65d832137e20e193c960802afba73b5d38sm private static final Vector2 sDefaultGravity = new Vector2(0.0f, -400.0f); 27cfd74d65d832137e20e193c960802afba73b5d38sm 28cfd74d65d832137e20e193c960802afba73b5d38sm public GravityComponent() { 29cfd74d65d832137e20e193c960802afba73b5d38sm super(); 30cfd74d65d832137e20e193c960802afba73b5d38sm mGravity = new Vector2(sDefaultGravity); 31cfd74d65d832137e20e193c960802afba73b5d38sm mScaledGravity = new Vector2(); 32cfd74d65d832137e20e193c960802afba73b5d38sm setPhase(ComponentPhases.PHYSICS.ordinal()); 33cfd74d65d832137e20e193c960802afba73b5d38sm } 34cfd74d65d832137e20e193c960802afba73b5d38sm 35cfd74d65d832137e20e193c960802afba73b5d38sm @Override 36cfd74d65d832137e20e193c960802afba73b5d38sm public void reset() { 37cfd74d65d832137e20e193c960802afba73b5d38sm mGravity.set(sDefaultGravity); 38cfd74d65d832137e20e193c960802afba73b5d38sm } 39cfd74d65d832137e20e193c960802afba73b5d38sm 40cfd74d65d832137e20e193c960802afba73b5d38sm @Override 41cfd74d65d832137e20e193c960802afba73b5d38sm public void update(float timeDelta, BaseObject parent) { 42cfd74d65d832137e20e193c960802afba73b5d38sm mScaledGravity.set(mGravity); 43cfd74d65d832137e20e193c960802afba73b5d38sm mScaledGravity.multiply(timeDelta); 44cfd74d65d832137e20e193c960802afba73b5d38sm ((GameObject) parent).getVelocity().add(mScaledGravity); 45cfd74d65d832137e20e193c960802afba73b5d38sm } 46cfd74d65d832137e20e193c960802afba73b5d38sm 47cfd74d65d832137e20e193c960802afba73b5d38sm public Vector2 getGravity() { 48cfd74d65d832137e20e193c960802afba73b5d38sm return mGravity; 49cfd74d65d832137e20e193c960802afba73b5d38sm } 50cfd74d65d832137e20e193c960802afba73b5d38sm 51cfd74d65d832137e20e193c960802afba73b5d38sm public void setGravityMultiplier(float multiplier) { 52cfd74d65d832137e20e193c960802afba73b5d38sm mGravity.set(sDefaultGravity); 53cfd74d65d832137e20e193c960802afba73b5d38sm mGravity.multiply(multiplier); 54cfd74d65d832137e20e193c960802afba73b5d38sm } 55cfd74d65d832137e20e193c960802afba73b5d38sm} 56