240 lines
8.0 KiB
C++
240 lines
8.0 KiB
C++
//
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// SuperTuxKart - a fun racing game with go-kart
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// Copyright (C) 2007-2015 Joerg Henrichs
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 3
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#include "items/bowling.hpp"
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#include "audio/sfx_base.hpp"
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#include "audio/sfx_manager.hpp"
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#include "graphics/hit_sfx.hpp"
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#include "graphics/material.hpp"
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#include "io/xml_node.hpp"
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#include "karts/abstract_kart.hpp"
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#include "modes/linear_world.hpp"
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#include "utils/log.hpp" //TODO: remove after debugging is done
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float Bowling::m_st_max_distance; // maximum distance for a bowling ball to be attracted
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float Bowling::m_st_max_distance_squared;
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float Bowling::m_st_force_to_target;
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// -----------------------------------------------------------------------------
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Bowling::Bowling(AbstractKart *kart)
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: Flyable(kart, PowerupManager::POWERUP_BOWLING, 50.0f /* mass */)
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{
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m_has_hit_kart = false;
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m_roll_sfx = SFXManager::get()->createSoundSource("bowling_roll");
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fixSFXSplitscreen(m_roll_sfx);
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m_roll_sfx->play();
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m_roll_sfx->setLoop(true);
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} // Bowling
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// ----------------------------------------------------------------------------
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/** Destructor, removes any playing sfx.
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*/
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Bowling::~Bowling()
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{
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// This will stop the sfx and delete the object.
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removeRollSfx();
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} // ~RubberBall
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// -----------------------------------------------------------------------------
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/** Initialises this object with data from the power.xml file.
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* \param node XML Node
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* \param bowling The bowling ball mesh
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*/
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void Bowling::init(const XMLNode &node, scene::IMesh *bowling)
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{
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Flyable::init(node, bowling, PowerupManager::POWERUP_BOWLING);
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m_st_max_distance = 20.0f;
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m_st_max_distance_squared = 20.0f * 20.0f;
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m_st_force_to_target = 10.0f;
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node.get("max-distance", &m_st_max_distance );
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m_st_max_distance_squared = m_st_max_distance*m_st_max_distance;
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node.get("force-to-target", &m_st_force_to_target);
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} // init
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// ----------------------------------------------------------------------------
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/** Updates the bowling ball ineach frame. If this function returns true, the
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* object will be removed by the projectile manager.
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* \param dt Time step size.
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* \returns True of this object should be removed.
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*/
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bool Bowling::updateAndDelete(int ticks)
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{
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bool can_be_deleted = Flyable::updateAndDelete(ticks);
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if (can_be_deleted)
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{
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removeRollSfx();
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return true;
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}
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const AbstractKart *kart=0;
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Vec3 direction;
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float minDistance;
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getClosestKart(&kart, &minDistance, &direction);
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if(kart && minDistance<m_st_max_distance_squared) // move bowling towards kart
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{
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// limit angle, so that the bowling ball does not turn
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// around to hit a kart behind
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if(fabs(m_body->getLinearVelocity().angle(direction)) < 1.3)
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{
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direction*=1/direction.length()*m_st_force_to_target;
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m_body->applyCentralForce(direction);
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}
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}
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// Bowling balls lose energy (e.g. when hitting the track), so increase
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// the speed if the ball is too slow, but only if it's not too high (if
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// the ball is too high, it is 'pushed down', which can reduce the
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// speed, which causes the speed to increase, which in turn causes
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// the ball to fly higher and higher.
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//btTransform trans = getTrans();
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float hat = (getXYZ() - getHitPoint()).length();
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if(hat-0.5f*m_extend.getY()<0.01f)
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{
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const Material *material = getMaterial();
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if(!material || material->isDriveReset())
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{
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hit(NULL);
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removeRollSfx();
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return true;
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}
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}
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btVector3 v = m_body->getLinearVelocity();
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float vlen = v.length2();
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if (hat<= m_max_height)
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{
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if(vlen<0.8*m_speed*m_speed)
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{ // bowling lost energy (less than 80%), i.e. it's too slow - speed it up:
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if(vlen==0.0f) {
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v = btVector3(.5f, .0, 0.5f); // avoid 0 div.
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}
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// m_body->setLinearVelocity(v*(m_speed/sqrt(vlen)));
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} // vlen < 0.8*m_speed*m_speed
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} // hat< m_max_height
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if(vlen<0.1)
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{
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hit(NULL);
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removeRollSfx();
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return true;
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}
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if (m_roll_sfx && m_roll_sfx->getStatus()==SFXBase::SFX_PLAYING)
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m_roll_sfx->setPosition(getXYZ());
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return false;
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} // updateAndDelete
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// -----------------------------------------------------------------------------
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/** Callback from the physics in case that a kart or physical object is hit.
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* The bowling ball triggers an explosion when hit.
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* \param kart The kart hit (NULL if no kart was hit).
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* \param object The object that was hit (NULL if none).
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* \returns True if there was actually a hit (i.e. not owner, and target is
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* not immune), false otherwise.
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*/
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bool Bowling::hit(AbstractKart* kart, PhysicalObject* obj)
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{
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bool was_real_hit = Flyable::hit(kart, obj);
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if(was_real_hit)
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{
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if(kart && kart->isShielded())
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{
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kart->decreaseShieldTime();
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return true;
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}
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else
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{
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m_has_hit_kart = kart != NULL;
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explode(kart, obj, /*hit_secondary*/false);
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}
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}
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return was_real_hit;
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} // hit
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// ----------------------------------------------------------------------------
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void Bowling::removeRollSfx()
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{
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if (m_roll_sfx)
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{
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m_roll_sfx->deleteSFX();
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m_roll_sfx = NULL;
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}
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} // removeRollSfx
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// ----------------------------------------------------------------------------
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/** Returns the hit effect object to use when this objects hits something.
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* \returns The hit effect object, or NULL if no hit effect should be played.
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*/
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HitEffect* Bowling::getHitEffect() const
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{
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if (GUIEngine::isNoGraphics())
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return NULL;
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if (m_deleted_once)
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return NULL;
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if(m_has_hit_kart)
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return new HitSFX(getXYZ(), "strike");
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else
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return new HitSFX(getXYZ(), "crash");
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} // getHitEffect
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// ----------------------------------------------------------------------------
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void Bowling::onFireFlyable()
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{
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Flyable::onFireFlyable();
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m_has_hit_kart = false;
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float y_offset = 0.5f*m_owner->getKartLength() + m_extend.getZ()*0.5f;
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// if the kart is looking backwards, release from the back
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if( m_owner->getControls().getLookBack())
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{
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y_offset = -y_offset;
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m_speed = -m_speed*2;
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}
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else
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{
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float min_speed = m_speed*4.0f;
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/* make it go faster when throwing forward
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so the player doesn't catch up with the ball
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and explode by touching it */
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m_speed = m_owner->getSpeed() + m_speed;
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if(m_speed < min_speed) m_speed = min_speed;
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}
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const Vec3& normal = m_owner->getNormal();
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createPhysics(y_offset, btVector3(0.0f, 0.0f, m_speed*2),
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new btSphereShape(0.5f*m_extend.getY()),
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0.4f /*restitution*/,
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-70.0f*normal /*gravity*/,
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true /*rotates*/);
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// Even if the ball is fired backwards, m_speed must be positive,
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// otherwise the ball can start to vibrate when energy is added.
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m_speed = fabsf(m_speed);
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// Do not adjust the up velociy depending on height above terrain, since
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// this would disable gravity.
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setAdjustUpVelocity(false);
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// should not live forever, auto-destruct after 20 seconds
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m_max_lifespan = stk_config->time2Ticks(20);
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} // onFireFlyable
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