source: orxonox.OLD/orxonox/trunk/src/world_entities/weapons/crosshair.cc @ 4818

/*
   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: Benjamin Grauer
   co-programmer: ...
*/

//#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_

#include "crosshair.h"
#include "event_handler.h"

#include "graphics_engine.h"
#include "glincl.h"
#include "p_node.h"
#include "state.h"

using namespace std;


/**
   \brief standard constructor
*/
Crosshair::Crosshair ()
{
  this->setClassID(CL_CROSSHAIR, "Crosshair");
  this->setName("Crosshair");

  EventHandler::getInstance()->subscribe(this, ES_GAME, EV_MOUSE_MOTION);

}


/**
   \brief standard deconstructor
*/
Crosshair::~Crosshair ()
{
  // delete what has to be deleted here
  EventHandler::getInstance()->unsubscribe(this);
}

void Crosshair::process(const Event &event)
{
  if  (event.type == EV_MOUSE_MOTION)
  {
    this->position2D[0] = event.x;
    this->position2D[1] = event.y;
  }

}


void Crosshair::draw() const
{
  const PNode* camera = State::getInstance()->getCamera();  //!< \todo MUST be different
  Vector cameraPos = camera->getAbsCoor();
  Vector cameraTargetPos = State::getInstance()->getCameraTarget()->getAbsCoor();
  Vector view = cameraTargetPos - cameraPos;
  Vector up = Vector(0, 1, 0);
  up = camera->getAbsDir().apply(up);
  Vector h = up.cross(view);
  Vector v = h.cross(view);
  h.normalize();
  v.normalize();

  float px = (position2D[0]-GraphicsEngine::getInstance()->getResolutionX()/2)*.05;
  float py = -(position2D[1]-GraphicsEngine::getInstance()->getResolutionY()/2)*.05;



  glBegin(GL_TRIANGLES);
  glVertex3f(cameraTargetPos.x - h.x*px - v.x*py,
             cameraTargetPos.y - h.y*px - v.y*py,
             cameraTargetPos.z - h.z*px - v.z*py);

  glVertex3f(cameraTargetPos.x - h.x*(px+1) - v.x*py,
             cameraTargetPos.y - h.y*(px+1) - v.y*py,
             cameraTargetPos.z - h.z*(px+1) - v.z*py);

  glVertex3f(cameraTargetPos.x - h.x*px - v.x*(py+1),
             cameraTargetPos.y - h.y*px - v.y*(py+1),
             cameraTargetPos.z - h.z*px - v.z*(py+1));

  glEnd();

}