1 files changed, 123 insertions, 0 deletions
diff --git a/Client/ThirdParty/Box2D/testbed/tests/distance_joint.cpp b/Client/ThirdParty/Box2D/testbed/tests/distance_joint.cpp
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+++ b/Client/ThirdParty/Box2D/testbed/tests/distance_joint.cpp
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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"
+#include "imgui/imgui.h"
+
+// This tests distance joints, body destruction, and joint destruction.
+class DistanceJoint : public Test
+{
+public:
+	DistanceJoint()
+	{
+		b2Body* ground = NULL;
+		{
+			b2BodyDef bd;
+			ground = m_world->CreateBody(&bd);
+
+			b2EdgeShape shape;
+			shape.SetTwoSided(b2Vec2(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f));
+			ground->CreateFixture(&shape, 0.0f);
+		}
+
+		{
+			b2BodyDef bd;
+			bd.type = b2_dynamicBody;
+			bd.angularDamping = 0.1f;
+
+			bd.position.Set(0.0f, 5.0f);
+			b2Body* body = m_world->CreateBody(&bd);
+
+			b2PolygonShape shape;
+			shape.SetAsBox(0.5f, 0.5f);
+			body->CreateFixture(&shape, 5.0f);
+
+			m_hertz = 1.0f;
+			m_dampingRatio = 0.7f;
+
+			b2DistanceJointDef jd;
+			jd.Initialize(ground, body, b2Vec2(0.0f, 15.0f), bd.position);
+			jd.collideConnected = true;
+			m_length = jd.length;
+			m_minLength = m_length;
+			m_maxLength = m_length;
+			b2LinearStiffness(jd.stiffness, jd.damping, m_hertz, m_dampingRatio, jd.bodyA, jd.bodyB);
+			m_joint = (b2DistanceJoint*)m_world->CreateJoint(&jd);
+		}
+	}
+
+	void UpdateUI() override
+	{
+		ImGui::SetNextWindowPos(ImVec2(10.0f, 100.0f));
+		ImGui::SetNextWindowSize(ImVec2(260.0f, 150.0f));
+		ImGui::Begin("Joint Controls", nullptr, ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize);
+
+		if (ImGui::SliderFloat("Length", &m_length, 0.0f, 20.0f, "%.0f"))
+		{
+			m_length = m_joint->SetLength(m_length);
+		}
+
+		if (ImGui::SliderFloat("Min Length", &m_minLength, 0.0f, 20.0f, "%.0f"))
+		{
+			m_minLength = m_joint->SetMinLength(m_minLength);
+		}
+
+		if (ImGui::SliderFloat("Max Length", &m_maxLength, 0.0f, 20.0f, "%.0f"))
+		{
+			m_maxLength = m_joint->SetMaxLength(m_maxLength);
+		}
+
+		if (ImGui::SliderFloat("Hertz", &m_hertz, 0.0f, 10.0f, "%.1f"))
+		{
+			float stiffness;
+			float damping;
+			b2LinearStiffness(stiffness, damping, m_hertz, m_dampingRatio, m_joint->GetBodyA(), m_joint->GetBodyB());
+			m_joint->SetStiffness(stiffness);
+			m_joint->SetDamping(damping);
+		}
+
+		if (ImGui::SliderFloat("Damping Ratio", &m_dampingRatio, 0.0f, 2.0f, "%.1f"))
+		{
+			float stiffness;
+			float damping;
+			b2LinearStiffness(stiffness, damping, m_hertz, m_dampingRatio, m_joint->GetBodyA(), m_joint->GetBodyB());
+			m_joint->SetStiffness(stiffness);
+			m_joint->SetDamping(damping);
+		}
+
+		ImGui::End();
+	}
+
+	static Test* Create()
+	{
+		return new DistanceJoint;
+	}
+
+	b2DistanceJoint* m_joint;
+	float m_length;
+	float m_minLength;
+	float m_maxLength;
+	float m_hertz;
+	float m_dampingRatio;
+};
+
+static int testIndex = RegisterTest("Joints", "Distance Joint", DistanceJoint::Create);