OneSidedPlatform.h
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上传日期:2022-01-07
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- /*
- * Copyright (c) 2008-2009 Erin Catto http://www.gphysics.com
- *
- * This software is provided 'as-is', without any express or implied
- * warranty. In no event will the authors be held liable for any damages
- * arising from the use of this software.
- * Permission is granted to anyone to use this software for any purpose,
- * including commercial applications, and to alter it and redistribute it
- * freely, subject to the following restrictions:
- * 1. The origin of this software must not be misrepresented; you must not
- * claim that you wrote the original software. If you use this software
- * in a product, an acknowledgment in the product documentation would be
- * appreciated but is not required.
- * 2. Altered source versions must be plainly marked as such, and must not be
- * misrepresented as being the original software.
- * 3. This notice may not be removed or altered from any source distribution.
- */
- #ifndef ONE_SIDED_PLATFORM_H
- #define ONE_SIDED_PLATFORM_H
- class OneSidedPlatform : public Test
- {
- public:
- enum State
- {
- e_unknown,
- e_above,
- e_below,
- };
- OneSidedPlatform()
- {
- // Ground
- {
- b2BodyDef bd;
- b2Body* ground = m_world->CreateBody(&bd);
- b2PolygonShape shape;
- shape.SetAsEdge(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)
- {
- Test::PreSolve(contact, oldManifold);
- b2Fixture* fixtureA = contact->GetFixtureA();
- b2Fixture* fixtureB = contact->GetFixtureB();
- if (fixtureA != m_platform && fixtureA != m_character)
- {
- return;
- }
- if (fixtureB != m_character && fixtureB != m_character)
- {
- return;
- }
- b2Vec2 position = m_character->GetBody()->GetPosition();
- if (position.y < m_top + m_radius - 3.0f * b2_linearSlop)
- {
- contact->SetEnabled(false);
- }
- }
- void Step(Settings* settings)
- {
- Test::Step(settings);
- m_debugDraw.DrawString(5, m_textLine, "Press: (c) create a shape, (d) destroy a shape.");
- m_textLine += 15;
- }
- static Test* Create()
- {
- return new OneSidedPlatform;
- }
- float32 m_radius, m_top, m_bottom;
- State m_state;
- b2Fixture* m_platform;
- b2Fixture* m_character;
- };
- #endif