source: orxonox.OLD/branches/presentation/src/world_entities/weapons/aiming_system.cc @ 9172

  /*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   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 2, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Patrick Boenzli
   co-programmer: ...
*/

#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_WEAPON

#include "aiming_system.h"

#include "util/loading/load_param.h"

#include "state.h"

#include "aabb.h"
#include "obb_tree.h"

#include <vector>


using namespace std;


/**
 * standart constructor
 */
AimingSystem::AimingSystem (WorldEntity* entity)
{
  this->owner = entity;

  this->init();
}


/**
 * destroys a AimingSystem
*/
AimingSystem::~AimingSystem ()
{}


/**
 * initializes the AimingSystem
 */
void AimingSystem::init()
{
  this->setClassID(CL_CROSSHAIR, "AimingSystem");
  this->setName("AimingSystem");

  //this->loadModel("models/guns/targeting_system_body2.obj");
//   this->loadModel("models/ships/fighter.obj");

  // registering default reactions:
  this->subscribeReaction(CREngine::CR_OBJECT_DAMAGE, CL_WORLD_ENTITY);

  this->range = 1000.0f;
  this->sideLength = 10.0f;

  // new obb tree
  this->obbTree = new OBBTree();
  this->obbTree->createBox(Vector(0.0f, 0.0f, 0.0f), Vector(this->range, this->sideLength, this->sideLength));
}



/**
 * get back the nearest target
 * @returns the nerest target
 */
WorldEntity* AimingSystem::getNearestTarget()
{

//   PRINTF(0)("size: %i\n", this->selectionList.size());


  if( this->selectionList.size() == 0)
    return NULL;


  WorldEntity* nearestEntity     = NULL;
  float        distance          = 0.0f;
  float        smalestDistance   = this->range * 5.0f;


  for( int i = 0; i < this->selectionList.size(); i++)
  {
    distance = fabs((this->getAbsCoor() - this->selectionList[i]->getAbsCoor()).len());
    if( distance < smalestDistance)
    {
      nearestEntity = this->selectionList[i];
      smalestDistance = distance;
    }
  }

  if( nearestEntity != this->owner)
    return nearestEntity;
  else
    return NULL;
}


/**
 * called when an object is "selected"
 *  @param damage damage to be dealt
 *  @param killer the entity
 */
void AimingSystem::hit(float damage, WorldEntity* killer)
{
  this->selectionList.push_back(killer);
}



/**
 * ticks the AimingSystem
 * @param dt the time to ticks
 */
void AimingSystem::tick(float dt)
{

//   this->selectionList.clear();
}


/**
 * draws the crosshair
 */
void AimingSystem::draw() const
{
//   WorldEntity::draw();

  glMatrixMode(GL_MODELVIEW);
  glPushMatrix();

  /* translate */
  glTranslatef (this->getAbsCoor ().x,
                this->getAbsCoor ().y,
                this->getAbsCoor ().z);
  Vector tmpRot = this->getAbsDir().getSpacialAxis();
  glRotatef (this->getAbsDir().getSpacialAxisAngle(), tmpRot.x, tmpRot.y, tmpRot.z );

  this->obbTree->drawBV(1, 1);

  glPopMatrix();

}