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authorchai <chaifix@163.com>2021-12-13 00:07:19 +0800
committerchai <chaifix@163.com>2021-12-13 00:07:19 +0800
commit60cbbdec07ab7a5636eac5b3c024ae44e937f4d4 (patch)
treeb2c7b0a868f18159dbc43d8954e1bd7668549a88 /Client/ThirdParty/Box2D/testbed/tests/platformer.cpp
+init
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+// 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);