C++ LocalPlayer::setSpeed方法代码示例

void ClientEnvironment::step(float dtime)
{
	DSTACK(__FUNCTION_NAME);

	// Get some settings
	bool free_move = g_settings.getBool("free_move");
	bool footprints = g_settings.getBool("footprints");

	// Get local player
	LocalPlayer *lplayer = getLocalPlayer();
	assert(lplayer);
	// collision info queue
	core::list<CollisionInfo> player_collisions;
	
	/*
		Get the speed the player is going
	*/
	bool is_climbing = lplayer->is_climbing;

	f32 player_speed = 0.001; // just some small value
	player_speed = lplayer->getSpeed().getLength();
	
	/*
		Maximum position increment
	*/
	//f32 position_max_increment = 0.05*BS;
	f32 position_max_increment = 0.1*BS;

	// Maximum time increment (for collision detection etc)
	// time = distance / speed
	f32 dtime_max_increment = position_max_increment / player_speed;
	
	// Maximum time increment is 10ms or lower
	if(dtime_max_increment > 0.01)
		dtime_max_increment = 0.01;
	
	// Don't allow overly huge dtime
	if(dtime > 0.5)
		dtime = 0.5;
	
	f32 dtime_downcount = dtime;

	/*
		Stuff that has a maximum time increment
	*/

	u32 loopcount = 0;
	do
	{
		loopcount++;

		f32 dtime_part;
		if(dtime_downcount > dtime_max_increment)
		{
			dtime_part = dtime_max_increment;
			dtime_downcount -= dtime_part;
		}
		else
		{
			dtime_part = dtime_downcount;
			/*
				Setting this to 0 (no -=dtime_part) disables an infinite loop
				when dtime_part is so small that dtime_downcount -= dtime_part
				does nothing
			*/
			dtime_downcount = 0;
		}
		
		/*
			Handle local player
		*/
		
		{
			v3f lplayerpos = lplayer->getPosition();
			
			// Apply physics
			if(free_move == false && is_climbing == false)
			{
				// Gravity
				v3f speed = lplayer->getSpeed();
				if(lplayer->swimming_up == false)
					speed.Y -= 9.81 * BS * dtime_part * 2;

				// Water resistance
				if(lplayer->in_water_stable || lplayer->in_water)
				{
					f32 max_down = 2.0*BS;
					if(speed.Y < -max_down) speed.Y = -max_down;

					f32 max = 2.5*BS;
					if(speed.getLength() > max)
					{
						speed = speed / speed.getLength() * max;
					}
				}

				lplayer->setSpeed(speed);
			}

			/*
//.........这里部分代码省略.........

//.........这里部分代码省略.........
			Handle local player
		*/

		{
			// Apply physics
			if(!free_move && !is_climbing)
			{
				// Gravity
				v3f speed = lplayer->getSpeed();
				if(!lplayer->in_liquid)
					speed.Y -= lplayer->movement_gravity * lplayer->physics_override_gravity * dtime_part * 2;

				// Liquid floating / sinking
				if(lplayer->in_liquid && !lplayer->swimming_vertical)
					speed.Y -= lplayer->movement_liquid_sink * dtime_part * 2;

				// Liquid resistance
				if(lplayer->in_liquid_stable || lplayer->in_liquid)
				{
					// How much the node's viscosity blocks movement, ranges between 0 and 1
					// Should match the scale at which viscosity increase affects other liquid attributes
					const f32 viscosity_factor = 0.3;

					v3f d_wanted = -speed / lplayer->movement_liquid_fluidity;
					f32 dl = d_wanted.getLength();
					if(dl > lplayer->movement_liquid_fluidity_smooth)
						dl = lplayer->movement_liquid_fluidity_smooth;
					dl *= (lplayer->liquid_viscosity * viscosity_factor) + (1 - viscosity_factor);

					v3f d = d_wanted.normalize() * dl;
					speed += d;
				}

				lplayer->setSpeed(speed);
			}

			/*
				Move the lplayer.
				This also does collision detection.
			*/
			lplayer->move(dtime_part, this, position_max_increment,
				&player_collisions);
		}
	}
	while(dtime_downcount > 0.001);

	//std::cout<<"Looped "<<loopcount<<" times."<<std::endl;

	for(std::vector<CollisionInfo>::iterator i = player_collisions.begin();
		i != player_collisions.end(); ++i) {
		CollisionInfo &info = *i;
		v3f speed_diff = info.new_speed - info.old_speed;;
		// Handle only fall damage
		// (because otherwise walking against something in fast_move kills you)
		if(speed_diff.Y < 0 || info.old_speed.Y >= 0)
			continue;
		// Get rid of other components
		speed_diff.X = 0;
		speed_diff.Z = 0;
		f32 pre_factor = 1; // 1 hp per node/s
		f32 tolerance = BS*14; // 5 without damage
		f32 post_factor = 1; // 1 hp per node/s
		if(info.type == COLLISION_NODE)
		{
			const ContentFeatures &f = m_client->ndef()->
				get(m_map->getNodeNoEx(info.node_p));