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
17package 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 */
23public 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