void b2World::DrawDebugData()

in Box2D/Dynamics/b2World.cpp [1135:1237]
87 lines of code
20 McCabe index (conditional complexity)

void b2World::DrawDebugData()
{
	if (m_debugDraw == NULL)
	{
		return;
	}

	uint32 flags = m_debugDraw->GetFlags();

	if (flags & b2Draw::e_shapeBit)
	{
		for (b2Body* b = m_bodyList; b; b = b->GetNext())
		{
			const b2Transform& xf = b->GetTransform();
			for (b2Fixture* f = b->GetFixtureList(); f; f = f->GetNext())
			{
				if (b->IsActive() == false)
				{
					DrawShape(f, xf, b2Color(0.5f, 0.5f, 0.3f));
				}
				else if (b->GetType() == b2_staticBody)
				{
					DrawShape(f, xf, b2Color(0.5f, 0.9f, 0.5f));
				}
				else if (b->GetType() == b2_kinematicBody)
				{
					DrawShape(f, xf, b2Color(0.5f, 0.5f, 0.9f));
				}
				else if (b->IsAwake() == false)
				{
					DrawShape(f, xf, b2Color(0.6f, 0.6f, 0.6f));
				}
				else
				{
					DrawShape(f, xf, b2Color(0.9f, 0.7f, 0.7f));
				}
			}
		}
	}

	if (flags & b2Draw::e_jointBit)
	{
		for (b2Joint* j = m_jointList; j; j = j->GetNext())
		{
			DrawJoint(j);
		}
	}

	if (flags & b2Draw::e_pairBit)
	{
		b2Color color(0.3f, 0.9f, 0.9f);
		for (b2Contact* c = m_contactManager.m_contactList; c; c = c->GetNext())
		{
			//b2Fixture* fixtureA = c->GetFixtureA();
			//b2Fixture* fixtureB = c->GetFixtureB();

			//b2Vec2 cA = fixtureA->GetAABB().GetCenter();
			//b2Vec2 cB = fixtureB->GetAABB().GetCenter();

			//m_debugDraw->DrawSegment(cA, cB, color);
		}
	}

	if (flags & b2Draw::e_aabbBit)
	{
		b2Color color(0.9f, 0.3f, 0.9f);
		b2BroadPhase* bp = &m_contactManager.m_broadPhase;

		for (b2Body* b = m_bodyList; b; b = b->GetNext())
		{
			if (b->IsActive() == false)
			{
				continue;
			}

			for (b2Fixture* f = b->GetFixtureList(); f; f = f->GetNext())
			{
				for (int32 i = 0; i < f->m_proxyCount; ++i)
				{
					b2FixtureProxy* proxy = f->m_proxies + i;
					b2AABB aabb = bp->GetFatAABB(proxy->proxyId);
					b2Vec2 vs[4];
					vs[0].Set(aabb.lowerBound.x, aabb.lowerBound.y);
					vs[1].Set(aabb.upperBound.x, aabb.lowerBound.y);
					vs[2].Set(aabb.upperBound.x, aabb.upperBound.y);
					vs[3].Set(aabb.lowerBound.x, aabb.upperBound.y);

					m_debugDraw->DrawPolygon(vs, 4, color);
				}
			}
		}
	}

	if (flags & b2Draw::e_centerOfMassBit)
	{
		for (b2Body* b = m_bodyList; b; b = b->GetNext())
		{
			b2Transform xf = b->GetTransform();
			xf.p = b->GetWorldCenter();
			m_debugDraw->DrawTransform(xf);
		}
	}
}