Add initial prototype.

3-mid/physics/implement/box2d/contrib/testbed/tests/chain.cpp

@@ -0,0 +1,92 @@
+// 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"
+
+#define TEST_BAD_BODY 0
+
+class Chain : public Test
+{
+public:
+	Chain()
+	{
+		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);
+		}
+
+		{
+			b2PolygonShape shape;
+			shape.SetAsBox(0.6f, 0.125f);
+
+			b2FixtureDef fd;
+			fd.shape = &shape;
+			fd.density = 20.0f;
+			fd.friction = 0.2f;
+
+			b2RevoluteJointDef jd;
+			jd.collideConnected = false;
+
+			const float y = 25.0f;
+			b2Body* prevBody = ground;
+			for (int32 i = 0; i < 30; ++i)
+			{
+				b2BodyDef bd;
+				bd.type = b2_dynamicBody;
+				bd.position.Set(0.5f + i, y);
+				b2Body* body = m_world->CreateBody(&bd);
+
+#if TEST_BAD_BODY == 1
+				if (i == 10)
+				{
+					// Test zero density dynamic body
+					fd.density = 0.0f;
+				}
+				else
+				{
+					fd.density = 20.0f;
+				}
+#endif
+
+				body->CreateFixture(&fd);
+
+				b2Vec2 anchor(float(i), y);
+				jd.Initialize(prevBody, body, anchor);
+				m_world->CreateJoint(&jd);
+
+				prevBody = body;
+			}
+		}
+	}
+
+	static Test* Create()
+	{
+		return new Chain;
+	}
+};
+
+static int testIndex = RegisterTest("Joints", "Chain", Chain::Create);