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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" | |
3d1f0813 | 19 | #include "Entities/PhysicsEntity.h" |
46e842c7 | 20 | |
6d9186c5 | 21 | float wellGravity = 0.5; |
46e842c7 PG |
22 | |
23 | /// ***** Constructors/Destructors ***** | |
24 | ||
25 | GravityWell::GravityWell(const Vector2& pos) | |
3ae4b047 | 26 | : m_position(pos) |
46e842c7 PG |
27 | { |
28 | ||
29 | } | |
30 | GravityWell::~GravityWell() | |
31 | { | |
32 | ||
33 | } | |
34 | ||
35 | /// ***** Public Class Methods ***** | |
36 | ||
37 | Vector2 GravityWell::forceDelta(const PhysicsEntity* e, float) const | |
38 | { | |
39 | const Vector2& pos = e->positionRaw(); | |
fd1a93a7 | 40 | float mass = e->m_mass; |
46e842c7 | 41 | |
3ae4b047 | 42 | Vector2 delta = m_position - pos; |
46e842c7 PG |
43 | float sqrDist = delta.sqrLength(); |
44 | ||
45 | Vector2 acc(0,0); | |
46 | ||
47 | if( sqrDist > 0.5F ) | |
6d9186c5 | 48 | acc += delta / sqrDist * mass * wellGravity; |
46e842c7 PG |
49 | |
50 | return acc; | |
51 | } | |
a823a800 PG |
52 | |
53 | void GravityWell::setPosition(const Vector2& pos) | |
54 | { | |
3ae4b047 | 55 | m_position = pos; |
a823a800 | 56 | } |