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e68f847b 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 | ||
ad9f1fb6 | 18 | #include "PhysicsEntity.h" |
89ca62b2 PG |
19 | #include "../debug.h" |
20 | ||
f206d19d | 21 | #include "../effectManager.h" |
617dcc71 PG |
22 | #include "../Vector2.h" |
23 | ||
24 | ||
25 | /// ***** Constructors/Destructors ***** | |
ad9f1fb6 | 26 | |
5f1f55d1 | 27 | PhysicsEntity::PhysicsEntity(const Vector2& pos) |
d69c6a21 | 28 | : Entity(pos), force(0,0), mass(1), CoR(0.8) |
ad9f1fb6 | 29 | { |
617dcc71 | 30 | |
ad9f1fb6 PG |
31 | } |
32 | PhysicsEntity::~PhysicsEntity() | |
33 | { | |
617dcc71 | 34 | |
ad9f1fb6 PG |
35 | } |
36 | ||
617dcc71 PG |
37 | /// ***** Public Class Methods ***** |
38 | ||
ad9f1fb6 PG |
39 | void PhysicsEntity::update(float time_step) |
40 | { | |
41 | position = positionAt(time_step); | |
42 | velocity = velocityAt(time_step); | |
43 | ||
44 | force *= 0; | |
45 | } | |
46 | ||
47 | Vector2 PhysicsEntity::positionAt(float time_step) const | |
48 | { | |
6aad402a PG |
49 | Vector2 newPosition = position; |
50 | Vector2 newVelocity = velocity; | |
51 | Vector2 newForce = force; | |
52 | ||
f206d19d PG |
53 | newPosition += effect::positionDelta(this, time_step); |
54 | newVelocity += effect::velocityDelta(this, time_step); | |
55 | newForce += effect::forceDelta(this, time_step); | |
6aad402a PG |
56 | |
57 | return newForce/mass / 2 * time_step * time_step + newVelocity * time_step + newPosition; | |
ad9f1fb6 PG |
58 | } |
59 | ||
60 | Vector2 PhysicsEntity::velocityAt(float time_step) const | |
61 | { | |
6aad402a PG |
62 | Vector2 newForce = force; |
63 | Vector2 newVelocity = velocity; | |
64 | ||
f206d19d PG |
65 | newForce += effect::forceDelta(this, time_step); |
66 | newVelocity += effect::velocityDelta(this, time_step); | |
6aad402a PG |
67 | |
68 | return newForce/mass / 2 * time_step + newVelocity; | |
ad9f1fb6 PG |
69 | } |
70 | ||
71 | void PhysicsEntity::applyForce(const Vector2& force) | |
72 | { | |
54fe85c5 PG |
73 | applyForce(force, position); |
74 | } | |
75 | void PhysicsEntity::applyForce(const Vector2& force, const Vector2& at) | |
76 | { | |
ad9f1fb6 PG |
77 | this->force += force; |
78 | } | |
79 | ||
54fe85c5 PG |
80 | void PhysicsEntity::applyImpulse(const Vector2& impulse) |
81 | { | |
82 | applyImpulse(impulse, position); | |
83 | } | |
84 | void PhysicsEntity::applyImpulse(const Vector2& impulse, const Vector2& at) | |
ad9f1fb6 | 85 | { |
54fe85c5 | 86 | velocity += impulse; |
ad9f1fb6 | 87 | } |