distanceMgr.cpp

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/*
 * distance.cpp
 *
 *  Created on: Jan 27, 2012
 *      Author: sushil
 */

#include <distanceMgr.h>
#include <engine.h>
#include <ent.h>
#include <const.h>

#include <cfloat>
#include "DEBUG.h"

//FastEcslent::DistanceMgr::DistanceMgr(){
//}

FastEcslent::DistanceMgr::DistanceMgr(Engine* eng, Options opts): Mgr (eng){
        options = opts;
        //nEnts = 0;
}

void FastEcslent::DistanceMgr::init(){
        //nEnts = engine->entityMgr->nEnts;
        //ents  = engine->entityMgr->ents;
        for(int i = 0; i < MaxEnts; i++){
                collisions[i] = 0;
                closestEnemy[i] = -1;
                closestEnemyDistance[i] = DBL_MAX;
                furthestEnt[i] = -1;
                furthestDistance[i] = 0;

        }
        collisionTotal = 0;
        //DEBUG(std::cout << "Distance Manager: " << nEnts << " number of ents in game" << std::endl;)

}



float FastEcslent::DistanceMgr::cpaTime(const Entity *ent1, const Entity *ent2){
        Ogre::Vector3 dv = ent1->vel - ent2->vel;
        float dvDotdv = dv.dotProduct(dv);
        if (dvDotdv < FastEcslent::EPSILON) {
                return 0.0;
        }
        Ogre::Vector3 w0 = ent1->pos - ent2->pos;
        return w0.dotProduct(dv)/dvDotdv;
}

float FastEcslent::DistanceMgr::cpaSquaredDistance(const Entity *ent1, const Entity *ent2){
        float cpaT = cpaTime(ent1, ent2);
        Ogre::Vector3 p1 = ent1->pos + (ent1->vel * cpaT);
        Ogre::Vector3 p2 = ent2->pos + (ent2->vel * cpaT);
        return p1.squaredDistance(p2);
}

void FastEcslent::DistanceMgr::tick (double dt){

        for (int i = 0; i < engine->entityMgr->nEnts; i++){
                ent = engine->entityMgr->ents[i];
                distance[i][i] = 0.0;
                distanceVec[i][i] = Ogre::Vector3(0.0, 0.0, 0.0);

                //need calculate closestEnemyDistance each frame
                closestEnemyDistance[i] = DBL_MAX;

                for (int j = i+1; j < engine->entityMgr->nEnts; j++){
                        other = engine->entityMgr->ents[j];

                        //ignore self
                        if(other->entityId.id == ent->entityId.id){
                                continue;
                        }
                        //if the saved entity is dead, reset the distance information.
                        if(other->entityState != FastEcslent::ALIVE && closestEnemy[i] == j){
                                closestEnemy[i] = -1;
                                closestEnemyDistance[i] = DBL_MAX;
                                furthestEnt[i] = -1;
                                furthestDistance[i] = 0;
                                return;
                        }

                        distanceVec[i][j] = other->pos - ent->pos;
                        normalizedDistanceVec[i][j] = distanceVec[i][j].normalisedCopy();
                        distanceVec[j][i] = ent->pos - other->pos;
                        normalizedDistanceVec[j][i] = distanceVec[j][i].normalisedCopy();
                        distance[i][j]    = distanceVec[i][j].length();
                        distance[j][i]    = distance[i][j];
/*                      if(distance[i][j] < (ent->length + other->length)*2){
                                collisions[i]++;
                                collisions[j]++;
                                collisionTotal++;
                        }*/
                        //if(distance[i][j] < closestEnemyDistance[i] && other->alive && other->entityId.side != ent->entityId.side){
                        if(distance[i][j] < closestEnemyDistance[i] && other->entityState == FastEcslent::ALIVE && other->entityId.side != ent->entityId.side){
                                closestEnemyDistance[i] = distance[i][j];
                                closestEnemy[i] = j;

                        }
                        //if(distance[j][i] < closestEnemyDistance[j] && ent->alive && other->entityId.side != ent->entityId.side){
                        if(distance[j][i] < closestEnemyDistance[j] && ent->entityState == FastEcslent::ALIVE && other->entityId.side != ent->entityId.side){
                                closestEnemyDistance[j] = distance[j][i];
                                closestEnemy[j] = i;
                        }
                        if(distance[i][j] > furthestDistance[i]){
                                furthestDistance[i] = distance[i][j];
                                furthestEnt[i] = j;
                        }
                        if(distance[j][i] > furthestDistance[j]){
                                furthestDistance[j] = distance[j][i];
                                furthestEnt[j] = i;
                        }
                        cpa[i][j].cpaTime = cpaTime(ent, other);
                        cpa[j][i].cpaTime = cpa[i][j].cpaTime;
                        cpa[i][j].cpaSquaredDistance = cpaSquaredDistance(ent, other);
                        cpa[j][i].cpaTime = cpa[i][j].cpaSquaredDistance;

                }
        }
}

void FastEcslent::DistanceMgr::dumpAll (){
        for (int i = 0; i < engine->entityMgr->nEnts; i++){
                dumpOne(i);
        }
}

void FastEcslent::DistanceMgr::dumpOne (int index){
        //Entity *ent = engine->entityMgr->ents[index];
        for (int j = 0; j < engine->entityMgr->nEnts; j++){
                //if (j == index) continue;
//              DEBUG(std::cout << "Distance from ent: " << ent->entityId.id <<  " to " << ents[j]->entityId.id << " is " << distance[index][j] << std::endl;)
                DEBUG(std::cout << distance[index][j] << ", ";)
        }
        DEBUG(std::cout << std::endl;)
}

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