1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
// MIT License
// Copyright (c) 2019 Erin Catto
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#include "test.h"
class Platformer : public Test
{
public:
enum State
{
e_unknown,
e_above,
e_below
};
Platformer()
{
// Ground
{
b2BodyDef bd;
b2Body* ground = m_world->CreateBody(&bd);
b2EdgeShape shape;
shape.SetTwoSided(b2Vec2(-20.0f, 0.0f), b2Vec2(20.0f, 0.0f));
ground->CreateFixture(&shape, 0.0f);
}
// Platform
{
b2BodyDef bd;
bd.position.Set(0.0f, 10.0f);
b2Body* body = m_world->CreateBody(&bd);
b2PolygonShape shape;
shape.SetAsBox(3.0f, 0.5f);
m_platform = body->CreateFixture(&shape, 0.0f);
m_bottom = 10.0f - 0.5f;
m_top = 10.0f + 0.5f;
}
// Actor
{
b2BodyDef bd;
bd.type = b2_dynamicBody;
bd.position.Set(0.0f, 12.0f);
b2Body* body = m_world->CreateBody(&bd);
m_radius = 0.5f;
b2CircleShape shape;
shape.m_radius = m_radius;
m_character = body->CreateFixture(&shape, 20.0f);
body->SetLinearVelocity(b2Vec2(0.0f, -50.0f));
m_state = e_unknown;
}
}
void PreSolve(b2Contact* contact, const b2Manifold* oldManifold) override
{
Test::PreSolve(contact, oldManifold);
b2Fixture* fixtureA = contact->GetFixtureA();
b2Fixture* fixtureB = contact->GetFixtureB();
if (fixtureA != m_platform && fixtureA != m_character)
{
return;
}
if (fixtureB != m_platform && fixtureB != m_character)
{
return;
}
#if 1
b2Vec2 position = m_character->GetBody()->GetPosition();
if (position.y < m_top + m_radius - 3.0f * b2_linearSlop)
{
contact->SetEnabled(false);
}
#else
b2Vec2 v = m_character->GetBody()->GetLinearVelocity();
if (v.y > 0.0f)
{
contact->SetEnabled(false);
}
#endif
}
void Step(Settings& settings) override
{
Test::Step(settings);
b2Vec2 v = m_character->GetBody()->GetLinearVelocity();
g_debugDraw.DrawString(5, m_textLine, "Character Linear Velocity: %f", v.y);
m_textLine += m_textIncrement;
}
static Test* Create()
{
return new Platformer;
}
float m_radius, m_top, m_bottom;
State m_state;
b2Fixture* m_platform;
b2Fixture* m_character;
};
static int testIndex = RegisterTest("Examples", "Platformer", Platformer::Create);
|
