Add initial prototype.

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

@@ -0,0 +1,94 @@
+// 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 ChainProblem : public Test
+{
+public:
+
+    ChainProblem()
+    {
+        {
+            b2Vec2 g(0.0f, -10.0f);
+            m_world->SetGravity(g);
+            b2Body** bodies = (b2Body**)b2Alloc(2 * sizeof(b2Body*));
+            b2Joint** joints = (b2Joint**)b2Alloc(0 * sizeof(b2Joint*));
+            {
+                b2BodyDef bd;
+                bd.type = b2BodyType(0);
+                bodies[0] = m_world->CreateBody(&bd);
+
+                {
+                    b2FixtureDef fd;
+
+                    b2Vec2 v1(0.0f, 1.0f);
+                    b2Vec2 v2(0.0f, 0.0f);
+                    b2Vec2 v3(4.0f, 0.0f);
+
+                    b2EdgeShape shape;
+                    shape.SetTwoSided(v1, v2);
+                    bodies[0]->CreateFixture(&shape, 0.0f);
+
+                    shape.SetTwoSided(v2, v3);
+                    bodies[0]->CreateFixture(&shape, 0.0f);
+                }
+            }
+            {
+                b2BodyDef bd;
+                bd.type = b2BodyType(2);
+                //bd.position.Set(6.033980250358582e-01f, 3.028350114822388e+00f);
+                bd.position.Set(1.0f, 3.0f);
+                bodies[1] = m_world->CreateBody(&bd);
+
+                {
+                    b2FixtureDef fd;
+                    fd.friction = 0.2f;
+                    fd.density = 10.0f;
+                    b2PolygonShape shape;
+                    b2Vec2 vs[8];
+                    vs[0].Set(0.5f, -3.0f);
+                    vs[1].Set(0.5f, 3.0f);
+                    vs[2].Set(-0.5f, 3.0f);
+                    vs[3].Set(-0.5f, -3.0f);
+                    shape.Set(vs, 4);
+
+                    fd.shape = &shape;
+
+                    bodies[1]->CreateFixture(&fd);
+                }
+            }
+            b2Free(joints);
+            b2Free(bodies);
+            joints = NULL;
+            bodies = NULL;
+        }
+    }
+
+    static Test* Create()
+    {
+        return new ChainProblem;
+    }
+
+};
+
+static int testIndex = RegisterTest("Bugs", "Chain Problem", ChainProblem::Create);