stk-code_catmod/src/karts/moveable.cpp

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//
// SuperTuxKart - a fun racing game with go-kart
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// Copyright (C) 2004-2015 Steve Baker <sjbaker1@airmail.net>
// Copyright (C) 2006-2015 Joerg Henrichs, Steve Baker
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 3
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <math.h>
#include "karts/moveable.hpp"
#include "graphics/irr_driver.hpp"
#include "graphics/material.hpp"
#include "graphics/material_manager.hpp"
#include "modes/world.hpp"
#include "tracks/track.hpp"
#include "ISceneNode.h"
Moveable::Moveable()
{
m_body = 0;
m_motion_state = 0;
m_mesh = NULL;
m_node = NULL;
m_heading = 0;
} // Moveable
//-----------------------------------------------------------------------------
Moveable::~Moveable()
{
// The body is being removed from the world in kart/projectile
if(m_body) delete m_body;
if(m_motion_state) delete m_motion_state;
if(m_node) irr_driver->removeNode(m_node);
if(m_mesh) irr_driver->removeMeshFromCache(m_mesh);
} // ~Moveable
//-----------------------------------------------------------------------------
/** Sets the mesh for this model.
* \param n The scene node.
*/
void Moveable::setNode(scene::ISceneNode *n)
{
m_node = n;
} // setNode
//-----------------------------------------------------------------------------
/** Updates the graphics model. Mainly set the graphical position to be the
* same as the physics position, but uses offsets to position and rotation
* for special gfx effects (e.g. skidding will turn the karts more).
* \param offset_xyz Offset to be added to the position.
* \param rotation Additional rotation.
*/
void Moveable::updateGraphics(float dt, const Vec3& offset_xyz,
const btQuaternion& rotation)
{
Vec3 xyz=getXYZ()+offset_xyz;
m_node->setPosition(xyz.toIrrVector());
btQuaternion r_all = getRotation()*rotation;
if(btFuzzyZero(r_all.getX()) && btFuzzyZero(r_all.getY()-0.70710677f) &&
btFuzzyZero(r_all.getZ()) && btFuzzyZero(r_all.getW()-0.70710677f) )
r_all.setX(0.000001f);
Vec3 hpr;
hpr.setHPR(r_all);
m_node->setRotation(hpr.toIrrHPR());
} // updateGraphics
//-----------------------------------------------------------------------------
/** The reset position must be set before calling reset
*/
void Moveable::reset()
{
if(m_body)
{
m_body->setLinearVelocity(btVector3(0.0, 0.0, 0.0));
m_body->setAngularVelocity(btVector3(0, 0, 0));
m_body->setCenterOfMassTransform(m_transform);
}
m_node->setVisible(true); // In case that the objects was eliminated
Vec3 up = getTrans().getBasis().getColumn(1);
m_pitch = atan2(up.getZ(), fabsf(up.getY()));
m_roll = atan2(up.getX(), up.getY());
m_velocityLC = Vec3(0, 0, 0);
Vec3 forw_vec = m_transform.getBasis().getColumn(0);
m_heading = -atan2f(forw_vec.getZ(), forw_vec.getX());
} // reset
//-----------------------------------------------------------------------------
void Moveable::flyUp()
{
m_body->setGravity(btVector3(0.0, 8.0, 0.0));
m_body->applyCentralImpulse(btVector3(0.0, 100.0, 0.0));
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} // flyUp
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// ----------------------------------------------------------------------------
void Moveable::flyDown()
{
m_body->applyCentralImpulse(btVector3(0.0, -100.0, 0.0));
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} // flyDown
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// ----------------------------------------------------------------------------
void Moveable::stopFlying()
{
m_body->setGravity(btVector3(0.0, -World::getWorld()->getTrack()->getGravity(), 0.0));
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} // stopFlying
//-----------------------------------------------------------------------------
/** Updates the current position and rotation from the corresponding physics
* body, and then calls updateGraphics to position the model correctly.
* \param float dt Time step size.
*/
void Moveable::update(float dt)
{
if(m_body->getInvMass()!=0)
m_motion_state->getWorldTransform(m_transform);
m_velocityLC = getVelocity()*m_transform.getBasis();
Vec3 forw_vec = m_transform.getBasis().getColumn(0);
m_heading = -atan2f(forw_vec.getZ(), forw_vec.getX());
// The pitch in hpr is in between -pi and pi. But for the camera it
// must be restricted to -pi/2 and pi/2 - so recompute it by restricting
// y to positive values, i.e. no pitch of more than pi/2.
Vec3 up = getTrans().getBasis().getColumn(1);
m_pitch = atan2(up.getZ(), fabsf(up.getY()));
m_roll = atan2(up.getX(), up.getY());
updateGraphics(dt, Vec3(0,0,0), btQuaternion(0, 0, 0, 1));
} // update
//-----------------------------------------------------------------------------
/** Creates the bullet rigid body for this moveable.
* \param mass Mass of this object.
* \param trans Transform (=position and orientation) for this object).
* \param shape Bullet collision shape for this object.
*/
void Moveable::createBody(float mass, btTransform& trans,
btCollisionShape *shape,
float restitution)
{
btVector3 inertia;
shape->calculateLocalInertia(mass, inertia);
m_transform = trans;
m_motion_state = new KartMotionState(trans);
btRigidBody::btRigidBodyConstructionInfo info(mass, m_motion_state,
shape, inertia);
info.m_restitution = restitution;
// Then create a rigid body
// ------------------------
m_body = new btRigidBody(info);
if(mass==0)
{
// Create a kinematic object
m_body->setCollisionFlags(m_body->getCollisionFlags() |
btCollisionObject::CF_KINEMATIC_OBJECT );
m_body->setActivationState(DISABLE_DEACTIVATION);
}
// The value of user_pointer must be set from the actual class, otherwise this
// is only a pointer to moveable, not to (say) kart, and virtual
// functions are not called correctly. So only init the pointer to zero.
m_user_pointer.zero();
m_body->setUserPointer(&m_user_pointer);
} // createBody
//-----------------------------------------------------------------------------
/** Places this moveable at a certain location and stores this transform in
* this Moveable, so that it can be accessed easily.
* \param t New transform for this moveable.
*/
void Moveable::setTrans(const btTransform &t)
{
m_transform=t;
if(m_motion_state)
m_motion_state->setWorldTransform(t);
} // setTrans