Method DestroyParticlesInShape

dev/include/Box2D/Particle/b2ParticleSystem.cpp:802–860

}

int32 b2ParticleSystem::DestroyParticlesInShape(
	const b2Shape& shape, const b2Transform& xf,
	bool callDestructionListener)
{
	b2Assert(m_world->IsLocked() == false);
	if (m_world->IsLocked())
	{
		return 0;
	}

	class DestroyParticlesInShapeCallback : public b2QueryCallback
	{
	public:
		DestroyParticlesInShapeCallback(
			b2ParticleSystem* system, const b2Shape& shape,
			const b2Transform& xf, bool callDestructionListener)
		{
			m_system = system;
			m_shape = &shape;
			m_xf = xf;
			m_callDestructionListener = callDestructionListener;
			m_destroyed = 0;
		}

		bool ReportFixture(b2Fixture* fixture)
		{
			B2_NOT_USED(fixture);
			return false;
		}

		bool ReportParticle(const b2ParticleSystem* particleSystem, int32 index)
		{
			if (particleSystem != m_system)
				return false;

			b2Assert(index >=0 && index < m_system->m_count);
			if (m_shape->TestPoint(m_xf,
								   m_system->m_positionBuffer.data[index]))
			{
				m_system->DestroyParticle(index, m_callDestructionListener);
				m_destroyed++;
			}
			return true;
		}

		int32 Destroyed() { return m_destroyed; }

	private:
		b2ParticleSystem* m_system;
		const b2Shape* m_shape;
		b2Transform m_xf;
		bool m_callDestructionListener;
		int32 m_destroyed;
	} callback(this, shape, xf, callDestructionListener);
	b2AABB aabb;
	shape.ComputeAABB(&aabb, xf, 0);
	m_world->QueryAABB(&callback, aabb);
	return callback.Destroyed();