add hello world example and edit source tree

examples/testbed/tests/hinge_chain.h

@@ -0,0 +1,90 @@
+/*
+* Copyright (c) 2016-2016 Irlan Robson http://www.irlan.net
+*
+* 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 HINGE_CHAIN_H
+#define HINGE_CHAIN_H
+
+class HingeChain : public Test
+{
+public:
+	HingeChain()
+	{
+		g_camera.m_zoom = 100.0f;
+		g_camera.m_q = b3Quat(b3Vec3(0.0f, 1.0f, 0.0f), 0.15f * B3_PI);
+		g_camera.m_q = g_camera.m_q * b3Quat(b3Vec3(1.0f, 0.0f, 0.0f), -0.15f * B3_PI);
+		g_camera.m_center.SetZero();
+
+		float32 x = -50.0f;
+		float32 y = 0.0f;
+
+		b3Body* lastHinge;
+		{
+			b3BodyDef bd;
+			bd.position.Set(x, y, 0.0f);
+			lastHinge = m_world.CreateBody(bd);
+
+			b3HullShape hull;
+			hull.m_hull = &m_doorHull;
+
+			b3ShapeDef sdef;
+			sdef.shape = &hull;
+			
+			lastHinge->CreateShape(sdef);
+		}
+		
+		x += 4.25f;
+
+		for (u32 i = 0; i < 20; ++i) 
+		{
+			b3BodyDef bd;
+			bd.type = e_dynamicBody;
+			bd.position.Set(x, y, 0.0f);
+			b3Body* hinge = m_world.CreateBody(bd);
+
+			b3HullShape hull;
+			hull.m_hull = &m_doorHull;
+			
+			b3ShapeDef sdef;
+			sdef.shape = &hull;
+			sdef.density = 1.0f;
+
+			hinge->CreateShape(sdef);
+			
+			{
+				b3Vec3 hingeAxis(0.0f, 1.0f, 0.0f);
+				b3Vec3 hingeAnchor(x - 2.25f, y, 0.0f);
+
+				b3RevoluteJointDef jd;
+				jd.Initialize(lastHinge, hinge, hingeAxis, hingeAnchor, 0.0f, 0.5f * B3_PI);
+				jd.collideLinked = true;
+
+				b3RevoluteJoint* rj = (b3RevoluteJoint*)m_world.CreateJoint(jd);
+			} 
+			
+			x += 4.25f;
+			lastHinge = hinge;
+		}
+	}
+
+	static Test* Create()
+	{
+		return new HingeChain();
+	}
+};
+
+#endif