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