Added Box2D

external/Box2D-2.3.1/Box2D/Testbed/Tests/BasicSliderCrank.h

@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2006-2014 Erin Catto http://www.box2d.org
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ * 1. The origin of this software must not be misrepresented; you must not
+ * claim that you wrote the original software. If you use this software
+ * in a product, an acknowledgment in the product documentation would be
+ * appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ */
+
+#ifndef BASIC_SLIDER_CRANK_H
+#define BASIC_SLIDER_CRANK_H
+
+// A basic slider crank created for GDC tutorial: Understanding Constraints
+class BasicSliderCrank : public Test
+{
+public:
+	BasicSliderCrank()
+	{
+		b2Body* ground = NULL;
+		{
+			b2BodyDef bd;
+            bd.position.Set(0.0f, 17.0f);
+			ground = m_world->CreateBody(&bd);
+		}
+        
+		{
+			b2Body* prevBody = ground;
+            
+			// Define crank.
+			{
+				b2PolygonShape shape;
+				shape.SetAsBox(4.0f, 1.0f);
+                
+				b2BodyDef bd;
+				bd.type = b2_dynamicBody;
+				bd.position.Set(-8.0f, 20.0f);
+				b2Body* body = m_world->CreateBody(&bd);
+				body->CreateFixture(&shape, 2.0f);
+                
+				b2RevoluteJointDef rjd;
+				rjd.Initialize(prevBody, body, b2Vec2(-12.0f, 20.0f));
+				m_world->CreateJoint(&rjd);
+                
+				prevBody = body;
+			}
+            
+			// Define connecting rod
+			{
+				b2PolygonShape shape;
+				shape.SetAsBox(8.0f, 1.0f);
+                
+				b2BodyDef bd;
+				bd.type = b2_dynamicBody;
+				bd.position.Set(4.0f, 20.0f);
+				b2Body* body = m_world->CreateBody(&bd);
+				body->CreateFixture(&shape, 2.0f);
+                
+				b2RevoluteJointDef rjd;
+				rjd.Initialize(prevBody, body, b2Vec2(-4.0f, 20.0f));
+				m_world->CreateJoint(&rjd);
+                
+				prevBody = body;
+			}
+            
+			// Define piston
+			{
+				b2PolygonShape shape;
+				shape.SetAsBox(3.0f, 3.0f);
+                
+				b2BodyDef bd;
+				bd.type = b2_dynamicBody;
+				bd.fixedRotation = true;
+				bd.position.Set(12.0f, 20.0f);
+				b2Body* body = m_world->CreateBody(&bd);
+				body->CreateFixture(&shape, 2.0f);
+                
+				b2RevoluteJointDef rjd;
+				rjd.Initialize(prevBody, body, b2Vec2(12.0f, 20.0f));
+				m_world->CreateJoint(&rjd);
+                
+				b2PrismaticJointDef pjd;
+				pjd.Initialize(ground, body, b2Vec2(12.0f, 17.0f), b2Vec2(1.0f, 0.0f));
+				m_world->CreateJoint(&pjd);
+			}
+  		}
+	}
+    
+	static Test* Create()
+	{
+		return new BasicSliderCrank;
+	}
+};
+
+#endif