aiMobState_Flyer.cpp

/*

Jump'n'Run Engine
http://www.atanaslaskov.com/jnr/

BSD LICENSE
Copyright (c) 2007-2013, Atanas Laskov
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
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this list of conditions and the following disclaimer.
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this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL ATANAS LASKOV BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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*/

#include "stdafx.h"
#include "ai.h"

aiMobState_Flyer::aiMobState_Flyer(void)
{
}

aiMobState_Flyer::~aiMobState_Flyer(void)
{
}

void aiMobState_Flyer::load(laFileParser *fp)
{
    aiMobState::load(fp);
    //aiMobState_Ramble::load(fp);

    fp->readDouble(&_dFlutterRange);
    fp->readDouble(&_dSwayRange);
    fp->readDouble(&_dFSSpeed);

    _ang = rand()%90;
}

// AI Percept Handlers
//
void aiMobState_Flyer::perceive_active( std::string strID_Old )
{
    laMonster* pMonster = (laMonster*) self();
    laPlayer* pPlayer   = (laPlayer*) player();

    pMonster->getPivot()-> bSimulateGravitation = M_FALSE;
    pMonster->move_v( laPoint3(1,0,0) );

    dY_Initial = pMonster->getPosition().y();

    pMonster->agressive(M_TRUE);
    pMonster->enableBattleGUI(M_FALSE);
}

void aiMobState_Flyer::perceive_inactive( std::string strID_New )
{
    laMonster* pMonster = (laMonster*) self();
    laPlayer* pPlayer   = (laPlayer*) player();
}

/*void aiMobState_Flyer::perceive_InTerritory(unsigned state)
{
    aiMobState_Ramble::perceive_InTerritory(state);

    laMonster* pMonster = (laMonster*) self();
    laPlayer* pPlayer   = (laPlayer*) player();

    //_select_creature();
    //pMonster->setOutline( laOutline(M_TRUE, laColor(255,255,255), 1.5) );
    //agent()->state("approach");
}*/

void aiMobState_Flyer::perceive_InRange(unsigned state)
{
    laMonster* pMonster = (laMonster*) self();
    laPlayer* pPlayer   = (laPlayer*) player();

    switch(state)
    {
        case PERCEPT_SET:
            pMonster->enableBattleGUI(M_TRUE);
            //pMonster->attackSelect(M_MATTACK_MAIN + rand()%1);
            pMonster->attackInitiate();
            break;

        case PERCEPT_HOLD:
            if( pMonster->attackIsCharged() ) {
                    pMonster->attack(pPlayer);
            }
            else {
                pMonster->attackSelect(M_MATTACK_MAIN + rand()%2);
                pMonster->attackInitiate();
            }
            break;

        case PERCEPT_RESET:
            pMonster->enableBattleGUI(M_FALSE);
            pMonster->attackStop();
            break;
    }
}

void aiMobState_Flyer::perceive(unsigned state, M_BOOL global, unsigned id, aiPerceptData data)
{
    laMonster* pMonster = (laMonster*) self();
    laPivot *pMobPivot = pMonster->getPivot();

    aiMobState::perceive(state, global, id, data);

    // NOTE: For this AI type gravity is off,
    // so we can controll both X and Y directly,
    // and use move_v() instead of move()
    //
    laPoint3 dir = laPoint3( pMonster->getMoveDirection(), 0);
    dir = _update_direction(dir);
    dir = _chase_player(dir);
    pMonster->move_v( dir );

    // Small-scale random motion, simulate flight
    _flutter();
}

// Determine mov dir; Takes precedence
//
laPoint3 aiMobState_Flyer::_update_direction(laPoint3 dir)
{
    laMonster* pMonster = (laMonster*) self();

    if( _obstacle_infront() )
    {
        dir[0] = -1 * dir.x();      // => reverse dir
    }
    else
    {
        // no obstacle => patrol within territory range
        //
        if( !_within_left_range() )
            dir[0] = +1;

        if( !_within_right_range() )
            dir[0] = -1;
    }

    return dir;
}

laPoint3 aiMobState_Flyer::_chase_player(laPoint3 dir)
{
    laMonster* pMonster = (laMonster*) self();
    laPlayer* pPlayer   = (laPlayer*) player();

    // Chase player
    //
    M_BOOL bChase = M_FALSE;

    if( _within_left_range() && _within_right_range() )
    {
        if( M_ABS(_dPlayerDistance) <= 4 * M_UNIT  )
        {
            // Chase player along Y but don't overlap
            if(  M_ABS(pPlayer->getPosition().y() - pMonster->getPosition().y() ) > M_UNIT )
            {
                if( pPlayer->getPosition().y() > pMonster->getPosition().y() ) dir[1] = +1;
                else dir[1] = -1;
            }
            // Move up a bit to avoid getting stuck to the ground
            else if( pPlayer->getPosition().y() < pMonster->getPosition().y() + M_UNIT * 0.8 )
                dir[1] = -1;
            else
                dir[1] = 0; // close enough

            // Chase player along X but don't overlap
            //
            if( (!agent()->isPerceiving(P__PLAYER_IN_RANGE))
                &&
                M_ABS(pPlayer->getPosition().x() - pMonster->getPosition().x() ) > M_UNIT )
            {
                if( pPlayer->getPosition().x() > pMonster->getPosition().x() ) dir[0] = +1;
                else dir[0] = -1;
            }
            else dir[0] = 0;    // close enough

            // Avoid placing the mosnter directly on top
            //
            if( M_ABS(pPlayer->getPosition().x() - pMonster->getPosition().x() ) < M_UNIT * 0.8 )
            {
                if( pMonster->getPosition().x() > pPlayer->getPosition().x() )
                {
                    pMonster->setExplicitFacing(M_TRUE);
                    pMonster->setFaceDirection(-1);
                    dir[0] = +1;
                }
                else
                {
                    pMonster->setExplicitFacing(M_TRUE);
                    pMonster->setFaceDirection(+1);
                    dir[0] = -1;
                }
            }
            else pMonster->setExplicitFacing(M_FALSE);

            // Remain in chasing mode
            bChase = M_TRUE;
            pPlayer->ctlBattleMode();
        }
    }

    _select_creature( bChase );

    // TODO: Steer to avoid terrain obstacles
    //
    /*if( _obstacle_infront() && ( dir.y() > 0 ) )  dir[1] =0;
    if( _obstacle_below() && ( dir.y() > 0 ) )  dir[1] =0;
    if( _obstacle_below() && ( dir.y() > 0 ) )  dir[1] =0;*/

    // Return to original Y
    //
    if( (!bChase) && (M_ABS(dY_Initial - pMonster->getPosition().y() ) >= 0.1 * M_UNIT) )
    {
        if( dY_Initial > pMonster->getPosition().y() ) dir[1] = +1;
        else dir[1] = -1;

        dir[0] = 1; // 'casue it gets nulified if the player is reached
    }

    return dir;
}

// Flutter and sway
//
void aiMobState_Flyer::_flutter()
{
    laMonster* pMonster = (laMonster*) self();
    laPivot *pMobPivot = pMonster->getPivot();
    double spf = ::laSystemIntegrator::getEnvironment()->getTimer()->delta();

    double var1 = sin(_ang);
    double var2 = sin(_ang*2);
    double var3 = sin(_ang*3);
    //double var4 = sin(_ang*2);

    pMobPivot->ptGeometryOffset[0] = var1 * M_UNIT * _dFlutterRange;
    pMobPivot->ptGeometryOffset[1] = var2 * M_UNIT * _dFlutterRange;
    pMobPivot->ptGeometryOffset[2]= var3 * M_UNIT * _dFlutterRange;
    pMobPivot->angleZ = var1 * _dSwayRange - _dSwayRange/2.0;
    pMobPivot->angleX = var2 * _dSwayRange - _dSwayRange/2.0;

    _ang += spf * _dFSSpeed;
    if( _ang > 360 ) _ang -= 360;
}

M_BOOL aiMobState_Flyer::_in_y_range(double distance)
{
    laMonster* pMonster = (laMonster*) self();

    if( M_ABS(dY_Initial - pMonster->getPosition().y() ) <= distance )
        return M_TRUE;
    return M_FALSE;
}

M_BOOL aiMobState_Flyer::_obstacle_infront()
{
    laMonster* pMonster = (laMonster*) self();
    laPivot *pMobPivot = pMonster->getPivot();

    int direction = pMonster->getMoveDirection();
    laPoint3 vTentacle(direction*M_UNIT*2, 0, 0);
    laPivot vPivot = (*pMobPivot);

    vPivot[1] += M_UNIT * 0.3;  // nudge up a bit to obtain a safe margin
    // NOTE: since the pitot is most likely in the middle,
    // use the margin to avoid penetration

    vTentacle = vPivot.projectVector(vTentacle);

    if( vTentacle.lenght() <= (vPivot.size.x()*0.5 + M_UNIT*0.15) ) return M_TRUE;
    else return M_FALSE;
}

M_BOOL aiMobState_Flyer::_obstacle_below()
{
    laMonster* pMonster = (laMonster*) self();
    laPivot *pMobPivot = pMonster->getPivot();

    int direction = pMonster->getMoveDirection();
    laPoint3 vTentacle(0, M_UNIT, 0);
    laPivot vPivot = (*pMobPivot);

    //vPivot[1] += M_UNIT * 0.3;
    vTentacle = vPivot.projectVector(vTentacle);

    if( vTentacle.lenght() <= M_UNIT*0.8 ) return M_TRUE;
    return M_FALSE;
}

M_BOOL aiMobState_Flyer::_obstacle_above()
{
    laMonster* pMonster = (laMonster*) self();
    laPivot *pMobPivot = pMonster->getPivot();

    int direction = pMonster->getMoveDirection();
    laPoint3 vTentacle(0, -1*M_UNIT, 0);
    laPivot vPivot = (*pMobPivot);

    //vPivot[1] += M_UNIT * 0.3;
    vTentacle = vPivot.projectVector(vTentacle);

    if( vTentacle.lenght() <= M_UNIT*0.8 ) return M_TRUE;
    return M_FALSE;
}