mirror of https://github.com/axmolengine/axmol.git
121 lines
4.1 KiB
C++
121 lines
4.1 KiB
C++
// MIT License
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// Copyright (c) 2019 Erin Catto
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#include "test.h"
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#include "ImGui/ImGuiPresenter.h"
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// This tests distance joints, body destruction, and joint destruction.
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class DistanceJoint : public Test
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{
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public:
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DistanceJoint()
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{
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b2Body* ground = NULL;
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{
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b2BodyDef bd;
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ground = m_world->CreateBody(&bd);
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b2EdgeShape shape;
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shape.SetTwoSided(b2Vec2(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f));
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ground->CreateFixture(&shape, 0.0f);
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}
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{
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b2BodyDef bd;
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bd.type = b2_dynamicBody;
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bd.angularDamping = 0.1f;
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bd.position.Set(0.0f, 5.0f);
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b2Body* body = m_world->CreateBody(&bd);
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b2PolygonShape shape;
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shape.SetAsBox(0.5f, 0.5f);
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body->CreateFixture(&shape, 5.0f);
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m_hertz = 1.0f;
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m_dampingRatio = 0.7f;
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b2DistanceJointDef jd;
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jd.Initialize(ground, body, b2Vec2(0.0f, 15.0f), bd.position);
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jd.collideConnected = true;
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m_length = jd.length;
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m_minLength = m_length;
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m_maxLength = m_length;
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b2LinearStiffness(jd.stiffness, jd.damping, m_hertz, m_dampingRatio, jd.bodyA, jd.bodyB);
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m_joint = (b2DistanceJoint*)m_world->CreateJoint(&jd);
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}
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}
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void UpdateUI() override
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{
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// ImGui::SetNextWindowPos(ImVec2(10.0f, 100.0f));
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ImGui::SetNextWindowSize(ImVec2(260.0f, 150.0f));
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ImGui::Begin("Joint Controls", nullptr, ImGuiWindowFlags_NoResize);
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if (ImGui::SliderFloat("Length", &m_length, 0.0f, 20.0f, "%.0f"))
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{
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m_length = m_joint->SetLength(m_length);
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}
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if (ImGui::SliderFloat("Min Length", &m_minLength, 0.0f, 20.0f, "%.0f"))
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{
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m_minLength = m_joint->SetMinLength(m_minLength);
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}
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if (ImGui::SliderFloat("Max Length", &m_maxLength, 0.0f, 20.0f, "%.0f"))
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{
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m_maxLength = m_joint->SetMaxLength(m_maxLength);
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}
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if (ImGui::SliderFloat("Hertz", &m_hertz, 0.0f, 10.0f, "%.1f"))
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{
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float stiffness;
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float damping;
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b2LinearStiffness(stiffness, damping, m_hertz, m_dampingRatio, m_joint->GetBodyA(), m_joint->GetBodyB());
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m_joint->SetStiffness(stiffness);
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m_joint->SetDamping(damping);
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}
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if (ImGui::SliderFloat("Damping Ratio", &m_dampingRatio, 0.0f, 2.0f, "%.1f"))
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{
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float stiffness;
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float damping;
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b2LinearStiffness(stiffness, damping, m_hertz, m_dampingRatio, m_joint->GetBodyA(), m_joint->GetBodyB());
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m_joint->SetStiffness(stiffness);
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m_joint->SetDamping(damping);
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}
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ImGui::End();
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}
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static Test* Create() { return new DistanceJoint; }
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b2DistanceJoint* m_joint;
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float m_length;
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float m_minLength;
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float m_maxLength;
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float m_hertz;
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float m_dampingRatio;
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};
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static int testIndex = RegisterTest("Joints", "Distance Joint", DistanceJoint::Create);
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