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 
GravityComponent()28     public GravityComponent() {
29         super();
30         mGravity = new Vector2(sDefaultGravity);
31         mScaledGravity = new Vector2();
32         setPhase(ComponentPhases.PHYSICS.ordinal());
33     }
34 
35     @Override
reset()36     public void reset() {
37         mGravity.set(sDefaultGravity);
38     }
39 
40     @Override
update(float timeDelta, BaseObject parent)41     public void update(float timeDelta, BaseObject parent) {
42     	mScaledGravity.set(mGravity);
43         mScaledGravity.multiply(timeDelta);
44         ((GameObject) parent).getVelocity().add(mScaledGravity);
45     }
46 
getGravity()47     public Vector2 getGravity() {
48         return mGravity;
49     }
50 
setGravityMultiplier(float multiplier)51     public void setGravityMultiplier(float multiplier) {
52         mGravity.set(sDefaultGravity);
53         mGravity.multiply(multiplier);
54     }
55 }
56