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MilitaryUnit.cpp

Go to the documentation of this file.

/*
CS Senior Project 2003
Team : Leftfield
Project : ModernWarfare
Members :
- Russ Christensen              <rchriste@cs.utah.edu>
- Todd Smith                    <tcsmith@cs.utah.edu>
- Usit Duongsaa                 <duongsaa@cs.utah.edu>
Copyright 2003 Russ Christensen, Usit Duongsaa, and Todd Smith. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 
THIS SOFTWARE IS PROVIDED BY RUSS CHRISTENSEN, USIT DUONGSAA, AND TODD SMITH ``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 RUSS, USIT, TODD OR OTHER CONTRIBUTORS 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 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "HelperFunctions.h"    // Helper::
#include "MilitaryUnit.h"
#include "Player.h"
#include "Sound.h"
#include "BattleEntry.h"
#include "BattleUnitData.h"
#include "GameState.h"

namespace {
        const FLOAT overheadMovementRate = 0.15f;
}

MilitaryUnit::MilitaryUnit(Vec3D initalPosition, Player* owner, UnitType unitType, const int armySize, Vec3D unitSize) : 
m_currPos(initalPosition), 
m_teamColor(owner->color()), 
m_unitSize(unitSize), 
m_direction(Vec3D(0,90.0f,0)),
m_goalPos(initalPosition),
m_unitType(unitType),
m_armySize(armySize),
m_currState(BUSY),
m_collisionSize(unitSize*2),
m_pOwner(owner),
m_overheadShortcutKey(-1)
{
}

MilitaryUnit::~MilitaryUnit(void)
{
}

void MilitaryUnit::goal(Vec3D dest)
{
        this->m_goalPos = dest;
        m_currState = BUSY;
}

Vec3D MilitaryUnit::goalPosition() const
{
        return this->m_goalPos;
}

bool MilitaryUnit::contains(Vec3D that) const
{
        // because a unit also has height (instead of just x,y) we'll do screen-space checking
        Vec2D pt(math_translateWorldToScreen(that));
        Vec2D unitPt(math_translateWorldToScreen(m_currPos));
        return math_dist2D(pt,unitPt)<0.03f;
}

bool MilitaryUnit::around(Vec3D that)
{
        return math_dist2D(Vec2D(this->m_currPos.x, this->m_currPos.y), Vec2D(that.x, that.y)) < BATTLE_RADIUS;
}

bool MilitaryUnit::collision(const MilitaryUnit* const that) const
{
        return (
                (m_currPos.z + m_collisionSize.z > that->position().z) &&
                (m_currPos.z - m_collisionSize.z < that->position().z) &&
                (m_currPos.x + m_collisionSize.x > that->position().x) &&
                (m_currPos.x - m_collisionSize.x < that->position().x) &&
                (m_currPos.y + m_collisionSize.y > that->position().y) &&
                (m_currPos.y - m_collisionSize.y < that->position().y) );
}

bool MilitaryUnit::fightingCollision(const MilitaryUnit* const that) const
{
        const FLOAT distanceForAFight(25.0f);
        return distanceForAFight > math_distPlanar3D(this->m_currPos, that->m_currPos);
}

bool MilitaryUnit::nearEachOther(const MilitaryUnit* const that) const
{
        const FLOAT distance(50.0f);
        return distance > math_distPlanar3D(this->m_currPos, that->m_currPos);
}

void MilitaryUnit::move()
{
        if (this->m_currState == WANTS_TO_STOP && !OverheadCollisonWithIdleUnit(this) && !OverheadCollisionWithCity(this))
        {
                m_currState = IDLE;
        }       
        if (this->m_currState != IDLE) {

                Vec3D savePos( m_currPos );
                Vec3D targetVec = m_goalPos - m_currPos;
                FLOAT targetDir = clipAngle( 90-D3DXToDegree( atan2f( targetVec.x, targetVec.y ) ) );
                FLOAT currentDir = m_direction.x;
                FLOAT delta;                            // signed (+CW,-CCW) smallest-magnitude difference in angle
                if(targetDir>currentDir)
                {
                        delta = targetDir - currentDir;
                        if(delta>180.0f) delta = delta - 360.0f;
                }
                else
                {
                        delta = targetDir - currentDir;
                        if(delta<-180.0f) delta = 360.0f - delta;
                }               

                const FLOAT turnRate = 0.4f;
                FLOAT turnAngle = delta;
                if (delta > turnRate ) turnAngle = turnRate;
                else if (delta < -turnRate ) turnAngle = -turnRate;
                else turnAngle = delta;
                m_direction.x = clipAngle( currentDir + turnAngle );                            // turn

                // move if we're heading roughly the right way
                FLOAT speed = 0.0f;
                if (absf(delta)<10.0f ) speed = 0.1f;
                else if( absf(delta)<90.0f ) speed = 0.06f;
                if (D3DXVec3Length(&targetVec) < 3.0f )                                 // if we're close to target, help stop accurately
                {
                        m_currPos += (m_goalPos-m_currPos) * 0.06f;
                        speed = 0.0f;
                }
                if (speed>0.0f)                                                                                 // otherwise, move normally
                {
                        FLOAT rad = D3DXToRadian( m_direction.x );
                        m_currPos += speed * Vec3D( cosf(rad), sinf(rad), 0.0f );
                }               

                /*
                FLOAT x_delta = this->m_goalPos.x - this->m_currPos.x;
                FLOAT y_delta = this->m_goalPos.y - this->m_currPos.y;
                FLOAT abs_x_delta = Helper::abs(x_delta);
                FLOAT abs_y_delta = Helper::abs(y_delta);
                if (abs_x_delta + abs_y_delta > 0.0f) { 
                FLOAT x_percent = abs_x_delta / (abs_x_delta + abs_y_delta);
                if (x_delta < 0.0f) x_percent *= -1;
                FLOAT y_percent = abs_y_delta / (abs_x_delta + abs_y_delta);
                if (y_delta < 0.0f) y_percent *= -1;
                FLOAT x_amount = x_percent * overheadMovementRate;
                FLOAT y_amount = y_percent * overheadMovementRate;
                if (Helper::abs(x_amount) > abs_x_delta) this->m_currPos.x = this->m_goalPos.x;
                else this->m_currPos.x += x_amount;
                if (Helper::abs(y_amount) > abs_y_delta) this->m_currPos.y = this->m_goalPos.y;
                else this->m_currPos.y += y_amount;
                */
                // make sure unit is within map bounds
                if (!GameState::worldMap().bounds.contains(Vec2D(this->m_currPos.x, this->m_currPos.y)) )
                        m_currPos = savePos;

                // is the unit at the goal position?
                FLOAT thresh = 0.1f;
                if (this->m_currPos.x <= m_goalPos.x + thresh  &&  this->m_currPos.x >= m_goalPos.x - thresh &&
                        this->m_currPos.y <= m_goalPos.y + thresh  &&  this->m_currPos.y >= m_goalPos.y - thresh )
                {
                        if (OverheadCollisonWithIdleUnit(this) || OverheadCollisionWithCity(this)) 
                        {
                                this->m_currState = WANTS_TO_STOP;
                                FLOAT newGoal = sys_randFloat() * 40.0F;
                                this->m_goalPos = Vec3D(m_currPos.x + newGoal, m_currPos.y + newGoal, 0);
                        } else 
                        {
                                m_currState = IDLE;
                        }
                }
        } else if (OverheadCollisonWithIdleUnit(this) || OverheadCollisionWithCity(this)) 
        {
                this->m_currState = WANTS_TO_STOP;
                FLOAT newGoal = sys_randFloat() * 40.0F;
                this->m_goalPos = Vec3D(m_currPos.x + newGoal, m_currPos.y + newGoal, 0);
        } else 
        {
                this->m_currState = IDLE;
        }

        // stay on terrain
        m_currPos.z = terrain_getHeight( artWork->worldMap, m_currPos.x, m_currPos.y ) + 0.33f;  // 0.33f to offset unit size
}

void MilitaryUnit::drawBox(void) const
{
        Vec3D pos = m_currPos;
        pos.z += 0.3f;
        FLOAT angle = (FLOAT)( (Globals::currGameTick*5) % 360 );
        mesh_render( artWork->circle, pos, Vec3D(5.0f,5.0f,0.001f), Vec3D(angle,0,0), artWork->colorGreen );
}

Player* MilitaryUnit::owner(void) const
{
        return this->m_pOwner;
}

Vec3D MilitaryUnit::color() const
{
        return m_teamColor;
}

Vec3D MilitaryUnit::position(void) const
{
        return this->m_currPos;
}

void MilitaryUnit::drawColor() const
{
        // team color box
        Vec3D p1(m_currPos), p2(m_currPos), p3(m_currPos), p4(m_currPos);
        const int delta = 4;    
        p1.x -= delta;
        p2.y += delta;
        p3.x += delta;
        p4.y -= delta;
        Vec2D s1( math_translateWorldToScreen(p1) );
        Vec2D s2( math_translateWorldToScreen(p2) );
        Vec2D s3( math_translateWorldToScreen(p3) );
        Vec2D s4( math_translateWorldToScreen(p4) );
        overlay_line( s1,s2, m_teamColor );
        overlay_line( s2,s3, m_teamColor );
        overlay_line( s3,s4, m_teamColor );
        overlay_line( s4,s1, m_teamColor );
}

void MilitaryUnit::setShortcutKey(int key)
{
        m_overheadShortcutKey = key;
}

int MilitaryUnit::shortcutKey() const
{
        return m_overheadShortcutKey;
}


LightTank::LightTank(const Vec3D & initialPosition, Player* owner, const int armySize) 
: MilitaryUnit(initialPosition, owner, UnitTypes::LIGHT_TANK, armySize, BattleUnitData::getObj().lightTankSize()),
m_turretSize(BattleUnitData::getObj().lightTankTurretSize())
{
}

LightTank::~LightTank(void)
{
}

void LightTank::draw(void) const
{
        mesh_render( artWork->lightTank_mesh, this->m_currPos, this->m_unitSize, this->m_direction, artWork->lightTank_texture, 0,
                this->color());
        mesh_render( artWork->lightTankTurret_mesh, this->m_currPos, this->m_turretSize, this->m_direction, artWork->lightTank_texture, 0,
                this->color());
}

HeavyTank::HeavyTank(const Vec3D & initialPosition, Player* owner, const int armySize) 
: MilitaryUnit(initialPosition, owner, UnitTypes::HEAVY_TANK, armySize, BattleUnitData::getObj().heavyTankSize()),
m_turretSize(BattleUnitData::getObj().heavyTankTurretSize())
{
}

HeavyTank::~HeavyTank(void)
{
}

void HeavyTank::draw() const
{
        mesh_render( artWork->heavyTank_mesh, this->m_currPos, this->m_unitSize, this->m_direction, artWork->heavyTank_texture, 0,
                this->color());
        mesh_render( artWork->heavyTankTurret_mesh, this->m_currPos, this->m_turretSize, this->m_direction, artWork->heavyTank_texture, 0,
                this->color());
}

RocketLauncher::RocketLauncher(const Vec3D & initialPosition, Player* owner, const int armySize) 
: MilitaryUnit(initialPosition, owner, UnitTypes::LAUNCHER, armySize, BattleUnitData::getObj().launcherSize())
{
}

RocketLauncher::~RocketLauncher(void)
{
}

void RocketLauncher::draw() const
{
        mesh_render( artWork->launcher_mesh, this->m_currPos, this->m_unitSize, this->m_direction, artWork->launcher_texture, 0,
                this->color());
}

Artillery::Artillery(const Vec3D & initialPosition, Player* owner, const int armySize) 
: MilitaryUnit(initialPosition, owner, UnitTypes::ARTILLERY, armySize, BattleUnitData::getObj().artillerySize()),
m_turretSize(BattleUnitData::getObj().artilleryTurretSize())
{
}

Artillery::~Artillery(void)
{
}

void Artillery::draw() const
{
        mesh_render( artWork->artillery_mesh, this->m_currPos, this->m_unitSize, this->m_direction, artWork->artillery_texture, 0,
                this->color());
        mesh_render( artWork->artilleryTurret_mesh, this->m_currPos, this->m_turretSize, this->m_direction, artWork->artillery_texture, 0,
                this->color());
}

Jet::Jet(const Vec3D & initialPosition, Player* owner, const int armySize, const int cityID )
: MilitaryUnit(initialPosition, owner, UnitTypes::JET, armySize, BattleUnitData::getObj().jetSize()),
 m_cityCenter(GameState::getCity(cityID)->position()),  m_ang(0.0f), m_liftOffAng(0.0f), 
 m_cityID(cityID), m_jetState(CIRCLE)
{
  m_currState = IDLE;
  // every 4 jets that guard city increases the radius at which they draw
  m_distFromCity = ((GameState::getCity(m_cityID)->jetGaurdSize() / 4)+1)*15.0f;
  m_currPos.x = m_cityCenter.x + (m_distFromCity * (cosf(m_ang*(D3DX_PI/180))));
  m_currPos.y = m_cityCenter.y + (m_distFromCity * (sinf(m_ang*(D3DX_PI/180))));
  m_currPos.z = 20.0f;
  // add one to the city i'm gaurding's list of jets
  GameState::getCity(m_cityID)->addJetGaurd();
  //sys_console() << "Adding jet gaurd" << GameState::getCity(m_cityID)->jetGaurdSize() << endl;

}

//const float Jet::s_drawDist = 15.0f;
const float Jet::s_dTheta = 0.5f;
const float Jet::s_speed = 0.2f;

Jet::~Jet(void)
{
  // delete one from the city i'm guarding
  GameState::getCity(m_cityID)->deleteJetGuard();
  //sys_console() << "Deleting jet gaurd" << GameState::getCity(m_cityID)->jetGaurdSize() << endl;
}


int Jet::getCityID()
{
        return m_cityID;
}

void Jet::draw() const
{
        mesh_render( artWork->jet_mesh, this->m_currPos, this->m_unitSize, this->m_direction, artWork->jet_texture, 0,
                this->color());
}

void Jet::goal(Vec3D dest)
{
  vector<City*>& cities = GameState::cities();
  for(CityIter iter=cities.begin(); iter != cities.end(); ++iter)
  {
    // if destination is a city
    if( (*iter)->color() == this->color() && math_distPlanar3D((*iter)->position(),dest) < 40.0f )
    {
      //   move there
      // remove myself from the current cities gaurd
      GameState::getCity(m_cityID)->deleteJetGuard();
      m_currState = BUSY;
      m_jetState = LIFTOFF;
      m_cityID = (*iter)->uniqueID();
      m_cityCenter = (*iter)->position();
      (*iter)->addJetGaurd();
      // radius the plane should fly at when it reaches city
      m_distFromCity = (((*iter)->jetGaurdSize() / 4)+1)*15.0f;
      m_ang = 0.0f;
      m_liftOffAng = math_getDir(m_currPos, (*iter)->position());
      m_goalPos.x = m_cityCenter.x + (m_distFromCity * (cosf(m_ang*(D3DX_PI/180))));
      m_goalPos.y = m_cityCenter.y + (m_distFromCity * (sinf(m_ang*(D3DX_PI/180))));
      m_velocity = m_goalPos - m_currPos;
      m_velocity *= (1/(sqrtf( m_velocity.x*m_velocity.x + m_velocity.y*m_velocity.y )))*s_speed  ;
      
      break;
    }
    // else
    //   do nothing
  }
}

const float Jet::s_dZ(0.1f);

void Jet::move()
{
  if(m_currState == IDLE)
  {
    // jet should circle the cities center
    // dont want to draw jets on top of each other, move if they collide
    m_ang += (OverheadCollisonWithIdleUnit(this) ? (sys_randInt()*s_dTheta) : s_dTheta);
    m_direction.x = math_clipAngle(m_ang + 90.0f);
    m_currPos.x = m_cityCenter.x + (m_distFromCity * (cosf(m_ang*(D3DX_PI/180))));
    m_currPos.y = m_cityCenter.y + (m_distFromCity * (sinf(m_ang*(D3DX_PI/180))));
  }
  else if (m_currState == BUSY)
  {
    // if we have just been order to move increase z and rotate to face new city
    if(m_jetState == LIFTOFF) 
    {
      if(Helper::abs(m_direction.x - m_liftOffAng) < 1.0f)
      {
        m_jetState = MOVING;
        return;
      }
      else
      {
        m_direction.x = math_clipAngle(m_direction.x+1.0f);
        m_currPos.z += s_dZ;
      }
    }
    else if(m_jetState == MOVING)
    {
      if( Helper::abs(m_currPos.x - m_goalPos.x) < 0.1f && Helper::abs(m_currPos.y - m_goalPos.y) < 0.1f )
      {
        m_jetState = ARRIVE;
      }
      else
      {
        // jet is moving to a new city
        m_currPos.x += m_velocity.x;
        m_currPos.y += m_velocity.y;
      }
    }
    else if(m_jetState == ARRIVE)
    {
      // jet should face 90.0 and descend

      bool atHeight = !((m_currPos.z - s_dZ) > 20.0f);
      if( !atHeight )
        m_currPos.z -= s_dZ;

      //if( math_clipAngle(m_direction.x + 1.0f) != 90.0f)
      bool atAng = !(Helper::abs(m_direction.x - 90.0f) > 1.0f); 
      if( !atAng )
        m_direction.x = math_clipAngle(m_direction.x + 1.0f);

      if( atHeight && atAng )
      {
        m_jetState = CIRCLE;
        m_currState = IDLE;
      }
    }

  }
}

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