finished changes to deps directory building
[physics.git] / Effects / GravityWell.cpp
... / ...
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1/*
2 * Copyright (C) 2008 Patrik Gornicz, Gornicz_P (at) hotmail (dot) com.
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include "GravityWell.h"
19#include "../Entities/PhysicsEntity.h"
20
21float wellGravity = 0.5;
22
23/// ***** Constructors/Destructors *****
24
25GravityWell::GravityWell(const Vector2& pos)
26 : position(pos)
27{
28
29}
30GravityWell::~GravityWell()
31{
32
33}
34
35/// ***** Public Class Methods *****
36
37Vector2 GravityWell::forceDelta(const PhysicsEntity* e, float) const
38{
39 const Vector2& pos = e->positionRaw();
40 float mass = e->mass;
41
42 Vector2 delta = position - pos;
43 float sqrDist = delta.sqrLength();
44
45 Vector2 acc(0,0);
46
47 if( sqrDist > 0.5F )
48 acc += delta / sqrDist * mass * wellGravity;
49
50 return acc;
51}
52
53void GravityWell::setPosition(const Vector2& pos)
54{
55 position = pos;
56}