diff options
Diffstat (limited to 'Client/ThirdParty/Box2D/testbed/tests/motor_joint.cpp')
-rw-r--r-- | Client/ThirdParty/Box2D/testbed/tests/motor_joint.cpp | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/Client/ThirdParty/Box2D/testbed/tests/motor_joint.cpp b/Client/ThirdParty/Box2D/testbed/tests/motor_joint.cpp new file mode 100644 index 0000000..dcda76f --- /dev/null +++ b/Client/ThirdParty/Box2D/testbed/tests/motor_joint.cpp @@ -0,0 +1,118 @@ +// 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 "settings.h" +#include "test.h" + +/// This test shows how to use a motor joint. A motor joint +/// can be used to animate a dynamic body. With finite motor forces +/// the body can be blocked by collision with other bodies. +class MotorJoint : public Test +{ +public: + MotorJoint() + { + b2Body* ground = NULL; + { + b2BodyDef bd; + ground = m_world->CreateBody(&bd); + + b2EdgeShape shape; + shape.SetTwoSided(b2Vec2(-20.0f, 0.0f), b2Vec2(20.0f, 0.0f)); + + b2FixtureDef fd; + fd.shape = &shape; + + ground->CreateFixture(&fd); + } + + // Define motorized body + { + b2BodyDef bd; + bd.type = b2_dynamicBody; + bd.position.Set(0.0f, 8.0f); + b2Body* body = m_world->CreateBody(&bd); + + b2PolygonShape shape; + shape.SetAsBox(2.0f, 0.5f); + + b2FixtureDef fd; + fd.shape = &shape; + fd.friction = 0.6f; + fd.density = 2.0f; + body->CreateFixture(&fd); + + b2MotorJointDef mjd; + mjd.Initialize(ground, body); + mjd.maxForce = 1000.0f; + mjd.maxTorque = 1000.0f; + m_joint = (b2MotorJoint*)m_world->CreateJoint(&mjd); + } + + m_go = false; + m_time = 0.0f; + } + + void Keyboard(int key) override + { + switch (key) + { + case GLFW_KEY_S: + m_go = !m_go; + break; + } + } + + void Step(Settings& settings) override + { + if (m_go && settings.m_hertz > 0.0f) + { + m_time += 1.0f / settings.m_hertz; + } + + b2Vec2 linearOffset; + linearOffset.x = 6.0f * sinf(2.0f * m_time); + linearOffset.y = 8.0f + 4.0f * sinf(1.0f * m_time); + + float angularOffset = 4.0f * m_time; + + m_joint->SetLinearOffset(linearOffset); + m_joint->SetAngularOffset(angularOffset); + + g_debugDraw.DrawPoint(linearOffset, 4.0f, b2Color(0.9f, 0.9f, 0.9f)); + + Test::Step(settings); + g_debugDraw.DrawString(5, m_textLine, "Keys: (s) pause"); + m_textLine += 15; + } + + static Test* Create() + { + return new MotorJoint; + } + + b2MotorJoint* m_joint; + float m_time; + bool m_go; +}; + +static int testIndex = RegisterTest("Joints", "Motor Joint", MotorJoint::Create); |