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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"
+
+// This is used to test sensor shapes.
+class Breakable : public Test
+{
+public:
+
+ enum
+ {
+ e_count = 7
+ };
+
+ Breakable()
+ {
+ // Ground body
+ {
+ b2BodyDef bd;
+ b2Body* ground = m_world->CreateBody(&bd);
+
+ b2EdgeShape shape;
+ shape.SetTwoSided(b2Vec2(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f));
+ ground->CreateFixture(&shape, 0.0f);
+ }
+
+ // Breakable dynamic body
+ {
+ b2BodyDef bd;
+ bd.type = b2_dynamicBody;
+ bd.position.Set(0.0f, 40.0f);
+ bd.angle = 0.25f * b2_pi;
+ m_body1 = m_world->CreateBody(&bd);
+
+ m_shape1.SetAsBox(0.5f, 0.5f, b2Vec2(-0.5f, 0.0f), 0.0f);
+ m_piece1 = m_body1->CreateFixture(&m_shape1, 1.0f);
+
+ m_shape2.SetAsBox(0.5f, 0.5f, b2Vec2(0.5f, 0.0f), 0.0f);
+ m_piece2 = m_body1->CreateFixture(&m_shape2, 1.0f);
+ }
+
+ m_break = false;
+ m_broke = false;
+ }
+
+ void PostSolve(b2Contact* contact, const b2ContactImpulse* impulse) override
+ {
+ if (m_broke)
+ {
+ // The body already broke.
+ return;
+ }
+
+ // Should the body break?
+ int32 count = contact->GetManifold()->pointCount;
+
+ float maxImpulse = 0.0f;
+ for (int32 i = 0; i < count; ++i)
+ {
+ maxImpulse = b2Max(maxImpulse, impulse->normalImpulses[i]);
+ }
+
+ if (maxImpulse > 40.0f)
+ {
+ // Flag the body for breaking.
+ m_break = true;
+ }
+ }
+
+ void Break()
+ {
+ // Create two bodies from one.
+ b2Body* body1 = m_piece1->GetBody();
+ b2Vec2 center = body1->GetWorldCenter();
+
+ body1->DestroyFixture(m_piece2);
+ m_piece2 = NULL;
+
+ b2BodyDef bd;
+ bd.type = b2_dynamicBody;
+ bd.position = body1->GetPosition();
+ bd.angle = body1->GetAngle();
+
+ b2Body* body2 = m_world->CreateBody(&bd);
+ m_piece2 = body2->CreateFixture(&m_shape2, 1.0f);
+
+ // Compute consistent velocities for new bodies based on
+ // cached velocity.
+ b2Vec2 center1 = body1->GetWorldCenter();
+ b2Vec2 center2 = body2->GetWorldCenter();
+
+ b2Vec2 velocity1 = m_velocity + b2Cross(m_angularVelocity, center1 - center);
+ b2Vec2 velocity2 = m_velocity + b2Cross(m_angularVelocity, center2 - center);
+
+ body1->SetAngularVelocity(m_angularVelocity);
+ body1->SetLinearVelocity(velocity1);
+
+ body2->SetAngularVelocity(m_angularVelocity);
+ body2->SetLinearVelocity(velocity2);
+ }
+
+ void Step(Settings& settings) override
+ {
+ if (m_break)
+ {
+ Break();
+ m_broke = true;
+ m_break = false;
+ }
+
+ // Cache velocities to improve movement on breakage.
+ if (m_broke == false)
+ {
+ m_velocity = m_body1->GetLinearVelocity();
+ m_angularVelocity = m_body1->GetAngularVelocity();
+ }
+
+ Test::Step(settings);
+ }
+
+ static Test* Create()
+ {
+ return new Breakable;
+ }
+
+ b2Body* m_body1;
+ b2Vec2 m_velocity;
+ float m_angularVelocity;
+ b2PolygonShape m_shape1;
+ b2PolygonShape m_shape2;
+ b2Fixture* m_piece1;
+ b2Fixture* m_piece2;
+
+ bool m_broke;
+ bool m_break;
+};
+
+static int testIndex = RegisterTest("Examples", "Breakable", Breakable::Create);