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TileEngine.cpp
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TileEngine.cpp
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/*
* Copyright 2010-2014 OpenXcom Developers.
*
* This file is part of OpenXcom.
*
* OpenXcom 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 3 of the License, or
* (at your option) any later version.
*
* OpenXcom is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with OpenXcom. If not, see <http://www.gnu.org/licenses/>.
*/
#define _USE_MATH_DEFINES
#include <assert.h>
#include <cmath>
#include <climits>
#include <set>
#include <functional>
#include "TileEngine.h"
#include <SDL.h>
#include "BattleAIState.h"
#include "AlienBAIState.h"
#include "UnitTurnBState.h"
#include "Map.h"
#include "Camera.h"
#include "../Savegame/SavedGame.h"
#include "../Savegame/SavedBattleGame.h"
#include "ExplosionBState.h"
#include "../Savegame/Tile.h"
#include "../Savegame/BattleItem.h"
#include "../Savegame/BattleUnit.h"
#include "../Savegame/Soldier.h"
#include "../Engine/RNG.h"
#include "BattlescapeState.h"
#include "../Ruleset/MapDataSet.h"
#include "../Ruleset/MapData.h"
#include "../Ruleset/Unit.h"
#include "../Ruleset/RuleSoldier.h"
#include "../Ruleset/Armor.h"
#include "../Ruleset/Ruleset.h"
#include "../Resource/ResourcePack.h"
#include "Pathfinding.h"
#include "../Engine/Options.h"
#include "ProjectileFlyBState.h"
#include "../Engine/Logger.h"
#include "../fmath.h"
namespace OpenXcom
{
const int TileEngine::heightFromCenter[11] = {0,-2,+2,-4,+4,-6,+6,-8,+8,-12,+12};
/**
* Sets up a TileEngine.
* @param save Pointer to SavedBattleGame object.
* @param voxelData List of voxel data.
*/
TileEngine::TileEngine(SavedBattleGame *save, std::vector<Uint16> *voxelData) : _save(save), _voxelData(voxelData), _personalLighting(true)
{
}
/**
* Deletes the TileEngine.
*/
TileEngine::~TileEngine()
{
}
/**
* Calculates sun shading for the whole terrain.
*/
void TileEngine::calculateSunShading()
{
const int layer = 0; // Ambient lighting layer.
for (int i = 0; i < _save->getMapSizeXYZ(); ++i)
{
_save->getTiles()[i]->resetLight(layer);
calculateSunShading(_save->getTiles()[i]);
}
}
/**
* Calculates sun shading for 1 tile. Sun comes from above and is blocked by floors or objects.
* @param tile The tile to calculate sun shading for.
*/
void TileEngine::calculateSunShading(Tile *tile)
{
const int layer = 0; // Ambient lighting layer.
int power = 15 - _save->getGlobalShade();
// At night/dusk sun isn't dropping shades blocked by roofs
if (_save->getGlobalShade() <= 4)
{
int block = 0;
int x = tile->getPosition().x;
int y = tile->getPosition().y;
for (int z = _save->getMapSizeZ()-1; z > tile->getPosition().z ; z--)
{
block += blockage(_save->getTile(Position(x, y, z)), MapData::O_FLOOR, DT_NONE);
block += blockage(_save->getTile(Position(x, y, z)), MapData::O_OBJECT, DT_NONE, Pathfinding::DIR_DOWN);
}
if (block>0)
{
power -= 2;
}
}
tile->addLight(power, layer);
}
/**
* Recalculates lighting for the terrain: objects,items,fire.
*/
void TileEngine::calculateTerrainLighting()
{
const int layer = 1; // Static lighting layer.
const int fireLightPower = 15; // amount of light a fire generates
// reset all light to 0 first
for (int i = 0; i < _save->getMapSizeXYZ(); ++i)
{
_save->getTiles()[i]->resetLight(layer);
}
// add lighting of terrain
for (int i = 0; i < _save->getMapSizeXYZ(); ++i)
{
// only floors and objects can light up
if (_save->getTiles()[i]->getMapData(MapData::O_FLOOR)
&& _save->getTiles()[i]->getMapData(MapData::O_FLOOR)->getLightSource())
{
addLight(_save->getTiles()[i]->getPosition(), _save->getTiles()[i]->getMapData(MapData::O_FLOOR)->getLightSource(), layer);
}
if (_save->getTiles()[i]->getMapData(MapData::O_OBJECT)
&& _save->getTiles()[i]->getMapData(MapData::O_OBJECT)->getLightSource())
{
addLight(_save->getTiles()[i]->getPosition(), _save->getTiles()[i]->getMapData(MapData::O_OBJECT)->getLightSource(), layer);
}
// fires
if (_save->getTiles()[i]->getFire())
{
addLight(_save->getTiles()[i]->getPosition(), fireLightPower, layer);
}
for (std::vector<BattleItem*>::iterator it = _save->getTiles()[i]->getInventory()->begin(); it != _save->getTiles()[i]->getInventory()->end(); ++it)
{
if ((*it)->getRules()->getBattleType() == BT_FLARE)
{
addLight(_save->getTiles()[i]->getPosition(), (*it)->getRules()->getPower(), layer);
}
}
}
}
/**
* Recalculates lighting for the units.
*/
void TileEngine::calculateUnitLighting()
{
const int layer = 2; // Dynamic lighting layer.
const int personalLightPower = 15; // amount of light a unit generates
const int fireLightPower = 15; // amount of light a fire generates
// reset all light to 0 first
for (int i = 0; i < _save->getMapSizeXYZ(); ++i)
{
_save->getTiles()[i]->resetLight(layer);
}
for (std::vector<BattleUnit*>::iterator i = _save->getUnits()->begin(); i != _save->getUnits()->end(); ++i)
{
// add lighting of soldiers
if (_personalLighting && (*i)->getFaction() == FACTION_PLAYER && !(*i)->isOut())
{
addLight((*i)->getPosition(), personalLightPower, layer);
}
// add lighting of units on fire
if ((*i)->getFire())
{
addLight((*i)->getPosition(), fireLightPower, layer);
}
}
}
/**
* Adds circular light pattern starting from center and losing power with distance travelled.
* @param center Center.
* @param power Power.
* @param layer Light is separated in 3 layers: Ambient, Static and Dynamic.
*/
void TileEngine::addLight(const Position ¢er, int power, int layer)
{
// only loop through the positive quadrant.
for (int x = 0; x <= power; ++x)
{
for (int y = 0; y <= power; ++y)
{
for (int z = 0; z < _save->getMapSizeZ(); z++)
{
int distance = (int)Round(sqrt(float(x*x + y*y)));
if (_save->getTile(Position(center.x + x,center.y + y, z)))
_save->getTile(Position(center.x + x,center.y + y, z))->addLight(power - distance, layer);
if (_save->getTile(Position(center.x - x,center.y - y, z)))
_save->getTile(Position(center.x - x,center.y - y, z))->addLight(power - distance, layer);
if (_save->getTile(Position(center.x - x,center.y + y, z)))
_save->getTile(Position(center.x - x,center.y + y, z))->addLight(power - distance, layer);
if (_save->getTile(Position(center.x + x,center.y - y, z)))
_save->getTile(Position(center.x + x,center.y - y, z))->addLight(power - distance, layer);
}
}
}
}
/**
* Calculates line of sight of a soldier.
* @param unit Unit to check line of sight of.
* @return True when new aliens are spotted.
*/
bool TileEngine::calculateFOV(BattleUnit *unit)
{
size_t oldNumVisibleUnits = unit->getUnitsSpottedThisTurn().size();
Position center = unit->getPosition();
Position test;
int direction;
bool swap;
std::vector<Position> _trajectory;
if (Options::strafe && (unit->getTurretType() > -1)) {
direction = unit->getTurretDirection();
}
else
{
direction = unit->getDirection();
}
swap = (direction==0 || direction==4);
int signX[8] = { +1, +1, +1, +1, -1, -1, -1, -1 };
int signY[8] = { -1, -1, -1, +1, +1, +1, -1, -1 };
int y1, y2;
unit->clearVisibleUnits();
unit->clearVisibleTiles();
if (unit->isOut())
return false;
Position pos = unit->getPosition();
if ((unit->getHeight() + unit->getFloatHeight() + -_save->getTile(unit->getPosition())->getTerrainLevel()) >= 24 + 4)
{
++pos.z;
}
for (int x = 0; x <= MAX_VIEW_DISTANCE; ++x)
{
if (direction%2)
{
y1 = 0;
y2 = MAX_VIEW_DISTANCE;
}
else
{
y1 = -x;
y2 = x;
}
for (int y = y1; y <= y2; ++y)
{
for (int z = 0; z < _save->getMapSizeZ(); z++)
{
const int distanceSqr = x*x + y*y;
test.z = z;
if (distanceSqr <= MAX_VIEW_DISTANCE*MAX_VIEW_DISTANCE)
{
test.x = center.x + signX[direction]*(swap?y:x);
test.y = center.y + signY[direction]*(swap?x:y);
if (_save->getTile(test))
{
BattleUnit *visibleUnit = _save->getTile(test)->getUnit();
if (visibleUnit && !visibleUnit->isOut() && visible(unit, _save->getTile(test)))
{
if (unit->getFaction() == FACTION_PLAYER)
{
visibleUnit->getTile()->setVisible(+1);
visibleUnit->setVisible(true);
}
if ((visibleUnit->getFaction() == FACTION_HOSTILE && unit->getFaction() == FACTION_PLAYER)
|| (visibleUnit->getFaction() != FACTION_HOSTILE && unit->getFaction() == FACTION_HOSTILE))
{
unit->addToVisibleUnits(visibleUnit);
unit->addToVisibleTiles(visibleUnit->getTile());
if (unit->getFaction() == FACTION_HOSTILE && visibleUnit->getFaction() != FACTION_HOSTILE)
{
visibleUnit->setTurnsSinceSpotted(0);
}
}
}
if (unit->getFaction() == FACTION_PLAYER)
{
// this sets tiles to discovered if they are in LOS - tile visibility is not calculated in voxelspace but in tilespace
// large units have "4 pair of eyes"
int size = unit->getArmor()->getSize();
for (int xo = 0; xo < size; xo++)
{
for (int yo = 0; yo < size; yo++)
{
Position poso = pos + Position(xo,yo,0);
_trajectory.clear();
int tst = calculateLine(poso, test, true, &_trajectory, unit, false);
size_t tsize = _trajectory.size();
if (tst>127) --tsize; //last tile is blocked thus must be cropped
for (size_t i = 0; i < tsize; i++)
{
Position posi = _trajectory.at(i);
//mark every tile of line as visible (as in original)
//this is needed because of bresenham narrow stroke.
_save->getTile(posi)->setVisible(+1);
_save->getTile(posi)->setDiscovered(true, 2);
// walls to the east or south of a visible tile, we see that too
Tile* t = _save->getTile(Position(posi.x + 1, posi.y, posi.z));
if (t) t->setDiscovered(true, 0);
t = _save->getTile(Position(posi.x, posi.y + 1, posi.z));
if (t) t->setDiscovered(true, 1);
}
}
}
}
}
}
}
}
}
// we only react when there are at least the same amount of visible units as before AND the checksum is different
// this way we stop if there are the same amount of visible units, but a different unit is seen
// or we stop if there are more visible units seen
if (unit->getUnitsSpottedThisTurn().size() > oldNumVisibleUnits && !unit->getVisibleUnits()->empty())
{
return true;
}
return false;
}
/**
* Gets the origin voxel of a unit's eyesight (from just one eye or something? Why is it x+7??
* @param currentUnit The watcher.
* @return Approximately an eyeball voxel.
*/
Position TileEngine::getSightOriginVoxel(BattleUnit *currentUnit)
{
// determine the origin and target voxels for the raytrace
Position originVoxel;
originVoxel = Position((currentUnit->getPosition().x * 16) + 7, (currentUnit->getPosition().y * 16) + 8, currentUnit->getPosition().z*24);
originVoxel.z += -_save->getTile(currentUnit->getPosition())->getTerrainLevel();
originVoxel.z += currentUnit->getHeight() + currentUnit->getFloatHeight() - 1; //one voxel lower (eye level)
Tile *tileAbove = _save->getTile(currentUnit->getPosition() + Position(0,0,1));
if (currentUnit->getArmor()->getSize() > 1)
{
originVoxel.x += 8;
originVoxel.y += 8;
originVoxel.z += 1; //topmost voxel
}
if (originVoxel.z >= (currentUnit->getPosition().z + 1)*24 && (!tileAbove || !tileAbove->hasNoFloor(0)))
{
while (originVoxel.z >= (currentUnit->getPosition().z + 1)*24)
{
originVoxel.z--;
}
}
return originVoxel;
}
/**
* Checks for an opposing unit on this tile.
* @param currentUnit The watcher.
* @param tile The tile to check for
* @return True if visible.
*/
bool TileEngine::visible(BattleUnit *currentUnit, Tile *tile)
{
// if there is no tile or no unit, we can't see it
if (!tile || !tile->getUnit())
{
return false;
}
// aliens can see in the dark, xcom can see at a distance of 9 or less, further if there's enough light.
if (currentUnit->getFaction() == FACTION_PLAYER &&
distance(currentUnit->getPosition(), tile->getPosition()) > 9 &&
tile->getShade() > MAX_DARKNESS_TO_SEE_UNITS)
{
return false;
}
if (currentUnit->getFaction() == tile->getUnit()->getFaction()) return true; // friendlies are always seen
Position originVoxel = getSightOriginVoxel(currentUnit);
bool unitSeen = false;
// for large units origin voxel is in the middle
Position scanVoxel;
std::vector<Position> _trajectory;
unitSeen = canTargetUnit(&originVoxel, tile, &scanVoxel, currentUnit);
if (unitSeen)
{
// now check if we really see it taking into account smoke tiles
// initial smoke "density" of a smoke grenade is around 15 per tile
// we do density/3 to get the decay of visibility
// so in fresh smoke we should only have 4 tiles of visibility
// this is traced in voxel space, with smoke affecting visibility every step of the way
_trajectory.clear();
calculateLine(originVoxel, scanVoxel, true, &_trajectory, currentUnit);
Tile *t = _save->getTile(currentUnit->getPosition());
size_t visibleDistance = _trajectory.size();
for (size_t i = 0; i < _trajectory.size(); i++)
{
if (t != _save->getTile(Position(_trajectory.at(i).x/16,_trajectory.at(i).y/16, _trajectory.at(i).z/24)))
{
t = _save->getTile(Position(_trajectory.at(i).x/16,_trajectory.at(i).y/16, _trajectory.at(i).z/24));
}
if (t->getFire() == 0)
{
visibleDistance += t->getSmoke() / 3;
}
if (visibleDistance > MAX_VOXEL_VIEW_DISTANCE)
{
unitSeen = false;
break;
}
}
}
return unitSeen;
}
/**
* Checks for how exposed unit is for another unit.
* @param originVoxel Voxel of trace origin (eye or gun's barrel).
* @param tile The tile to check for.
* @param excludeUnit Is self (not to hit self).
* @param excludeAllBut [Optional] is unit which is the only one to be considered for ray hits.
* @return Degree of exposure (as percent).
*/
int TileEngine::checkVoxelExposure(Position *originVoxel, Tile *tile, BattleUnit *excludeUnit, BattleUnit *excludeAllBut)
{
Position targetVoxel = Position((tile->getPosition().x * 16) + 7, (tile->getPosition().y * 16) + 8, tile->getPosition().z * 24);
Position scanVoxel;
std::vector<Position> _trajectory;
BattleUnit *otherUnit = tile->getUnit();
if (otherUnit == 0) return 0; //no unit in this tile, even if it elevated and appearing in it.
if (otherUnit == excludeUnit) return 0; //skip self
int targetMinHeight = targetVoxel.z - tile->getTerrainLevel();
if (otherUnit)
targetMinHeight += otherUnit->getFloatHeight();
// if there is an other unit on target tile, we assume we want to check against this unit's height
int heightRange;
int unitRadius = otherUnit->getLoftemps(); //width == loft in default loftemps set
if (otherUnit->getArmor()->getSize() > 1)
{
unitRadius = 3;
}
// vector manipulation to make scan work in view-space
Position relPos = targetVoxel - *originVoxel;
float normal = unitRadius/sqrt((float)(relPos.x*relPos.x + relPos.y*relPos.y));
int relX = floor(((float)relPos.y)*normal+0.5);
int relY = floor(((float)-relPos.x)*normal+0.5);
int sliceTargets[10]={0,0, relX,relY, -relX,-relY};
if (!otherUnit->isOut())
{
heightRange = otherUnit->getHeight();
}
else
{
heightRange = 12;
}
int targetMaxHeight=targetMinHeight+heightRange;
// scan ray from top to bottom plus different parts of target cylinder
int total=0;
int visible=0;
for (int i = heightRange; i >=0; i-=2)
{
++total;
scanVoxel.z=targetMinHeight+i;
for (int j = 0; j < 2; ++j)
{
scanVoxel.x=targetVoxel.x + sliceTargets[j*2];
scanVoxel.y=targetVoxel.y + sliceTargets[j*2+1];
_trajectory.clear();
int test = calculateLine(*originVoxel, scanVoxel, false, &_trajectory, excludeUnit, true, false, excludeAllBut);
if (test == V_UNIT)
{
//voxel of hit must be inside of scanned box
if (_trajectory.at(0).x/16 == scanVoxel.x/16 &&
_trajectory.at(0).y/16 == scanVoxel.y/16 &&
_trajectory.at(0).z >= targetMinHeight &&
_trajectory.at(0).z <= targetMaxHeight)
{
++visible;
}
}
}
}
return (visible*100)/total;
}
/**
* Checks for another unit available for targeting and what particular voxel.
* @param originVoxel Voxel of trace origin (eye or gun's barrel).
* @param tile The tile to check for.
* @param scanVoxel is returned coordinate of hit.
* @param excludeUnit is self (not to hit self).
* @param potentialUnit is a hypothetical unit to draw a virtual line of fire for AI. if left blank, this function behaves normally.
* @return True if the unit can be targetted.
*/
bool TileEngine::canTargetUnit(Position *originVoxel, Tile *tile, Position *scanVoxel, BattleUnit *excludeUnit, BattleUnit *potentialUnit)
{
Position targetVoxel = Position((tile->getPosition().x * 16) + 7, (tile->getPosition().y * 16) + 8, tile->getPosition().z * 24);
std::vector<Position> _trajectory;
bool hypothetical = potentialUnit != 0;
if (potentialUnit == 0)
{
potentialUnit = tile->getUnit();
if (potentialUnit == 0) return false; //no unit in this tile, even if it elevated and appearing in it.
}
if (potentialUnit == excludeUnit) return false; //skip self
int targetMinHeight = targetVoxel.z - tile->getTerrainLevel();
targetMinHeight += potentialUnit->getFloatHeight();
int targetMaxHeight = targetMinHeight;
int targetCenterHeight;
// if there is an other unit on target tile, we assume we want to check against this unit's height
int heightRange;
int unitRadius = potentialUnit->getLoftemps(); //width == loft in default loftemps set
int targetSize = potentialUnit->getArmor()->getSize() - 1;
int xOffset = potentialUnit->getPosition().x - tile->getPosition().x;
int yOffset = potentialUnit->getPosition().y - tile->getPosition().y;
if (targetSize > 0)
{
unitRadius = 3;
}
// vector manipulation to make scan work in view-space
Position relPos = targetVoxel - *originVoxel;
float normal = unitRadius/sqrt((float)(relPos.x*relPos.x + relPos.y*relPos.y));
int relX = floor(((float)relPos.y)*normal+0.5);
int relY = floor(((float)-relPos.x)*normal+0.5);
int sliceTargets[10]={0,0, relX,relY, -relX,-relY, relY,-relX, -relY,relX};
if (!potentialUnit->isOut())
{
heightRange = potentialUnit->getHeight();
}
else
{
heightRange = 12;
}
targetMaxHeight += heightRange;
targetCenterHeight=(targetMaxHeight+targetMinHeight)/2;
heightRange/=2;
if (heightRange>10) heightRange=10;
if (heightRange<=0) heightRange=0;
// scan ray from top to bottom plus different parts of target cylinder
for (int i = 0; i <= heightRange; ++i)
{
scanVoxel->z=targetCenterHeight+heightFromCenter[i];
for (int j = 0; j < 5; ++j)
{
if (i < (heightRange-1) && j>2) break; //skip unnecessary checks
scanVoxel->x=targetVoxel.x + sliceTargets[j*2];
scanVoxel->y=targetVoxel.y + sliceTargets[j*2+1];
_trajectory.clear();
int test = calculateLine(*originVoxel, *scanVoxel, false, &_trajectory, excludeUnit, true, false);
if (test == V_UNIT)
{
for (int x = 0; x <= targetSize; ++x)
{
for (int y = 0; y <= targetSize; ++y)
{
//voxel of hit must be inside of scanned box
if (_trajectory.at(0).x/16 == (scanVoxel->x/16) + x + xOffset &&
_trajectory.at(0).y/16 == (scanVoxel->y/16) + y + yOffset &&
_trajectory.at(0).z >= targetMinHeight &&
_trajectory.at(0).z <= targetMaxHeight)
{
return true;
}
}
}
}
else if (test == V_EMPTY && hypothetical && !_trajectory.empty())
{
return true;
}
}
}
return false;
}
/**
* Checks for a tile part available for targeting and what particular voxel.
* @param originVoxel Voxel of trace origin (gun's barrel).
* @param tile The tile to check for.
* @param part Tile part to check for.
* @param scanVoxel Is returned coordinate of hit.
* @param excludeUnit Is self (not to hit self).
* @return True if the tile can be targetted.
*/
bool TileEngine::canTargetTile(Position *originVoxel, Tile *tile, int part, Position *scanVoxel, BattleUnit *excludeUnit)
{
static int sliceObjectSpiral[82] = {8,8, 8,6, 10,6, 10,8, 10,10, 8,10, 6,10, 6,8, 6,6, //first circle
8,4, 10,4, 12,4, 12,6, 12,8, 12,10, 12,12, 10,12, 8,12, 6,12, 4,12, 4,10, 4,8, 4,6, 4,4, 6,4, //second circle
8,1, 12,1, 15,1, 15,4, 15,8, 15,12, 15,15, 12,15, 8,15, 4,15, 1,15, 1,12, 1,8, 1,4, 1,1, 4,1}; //third circle
static int westWallSpiral[14] = {0,7, 0,9, 0,6, 0,11, 0,4, 0,13, 0,2};
static int northWallSpiral[14] = {7,0, 9,0, 6,0, 11,0, 4,0, 13,0, 2,0};
Position targetVoxel = Position((tile->getPosition().x * 16), (tile->getPosition().y * 16), tile->getPosition().z * 24);
std::vector<Position> _trajectory;
int *spiralArray;
int spiralCount;
int minZ, maxZ;
bool minZfound = false, maxZfound = false;
if (part == MapData::O_OBJECT)
{
spiralArray = sliceObjectSpiral;
spiralCount = 41;
}
else
if (part == MapData::O_NORTHWALL)
{
spiralArray = northWallSpiral;
spiralCount = 7;
}
else
if (part == MapData::O_WESTWALL)
{
spiralArray = westWallSpiral;
spiralCount = 7;
}
else if (part == MapData::O_FLOOR)
{
spiralArray = sliceObjectSpiral;
spiralCount = 41;
minZfound = true; minZ=0;
maxZfound = true; maxZ=0;
}
else
{
return false;
}
// find out height range
if (!minZfound)
{
for (int j = 1; j < 12; ++j)
{
if (minZfound) break;
for (int i = 0; i < spiralCount; ++i)
{
int tX = spiralArray[i*2];
int tY = spiralArray[i*2+1];
if (voxelCheck(Position(targetVoxel.x + tX, targetVoxel.y + tY, targetVoxel.z + j*2),0,true) == part) //bingo
{
if (!minZfound)
{
minZ = j*2;
minZfound = true;
break;
}
}
}
}
}
if (!minZfound) return false;//empty object!!!
if (!maxZfound)
{
for (int j = 10; j >= 0; --j)
{
if (maxZfound) break;
for (int i = 0; i < spiralCount; ++i)
{
int tX = spiralArray[i*2];
int tY = spiralArray[i*2+1];
if (voxelCheck(Position(targetVoxel.x + tX, targetVoxel.y + tY, targetVoxel.z + j*2),0,true) == part) //bingo
{
if (!maxZfound)
{
maxZ = j*2;
maxZfound = true;
break;
}
}
}
}
}
if (!maxZfound) return false;//it's impossible to get there
if (minZ > maxZ) minZ = maxZ;
int rangeZ = maxZ - minZ;
int centerZ = (maxZ + minZ)/2;
for (int j = 0; j <= rangeZ; ++j)
{
scanVoxel->z = targetVoxel.z + centerZ + heightFromCenter[j];
for (int i = 0; i < spiralCount; ++i)
{
scanVoxel->x = targetVoxel.x + spiralArray[i*2];
scanVoxel->y = targetVoxel.y + spiralArray[i*2+1];
_trajectory.clear();
int test = calculateLine(*originVoxel, *scanVoxel, false, &_trajectory, excludeUnit, true);
if (test == part) //bingo
{
if (_trajectory.at(0).x/16 == scanVoxel->x/16 &&
_trajectory.at(0).y/16 == scanVoxel->y/16 &&
_trajectory.at(0).z/24 == scanVoxel->z/24)
{
return true;
}
}
}
}
return false;
}
/**
* Calculates line of sight of a soldiers within range of the Position
* (used when terrain has changed, which can reveal new parts of terrain or units).
* @param position Position of the changed terrain.
*/
void TileEngine::calculateFOV(const Position &position)
{
for (std::vector<BattleUnit*>::iterator i = _save->getUnits()->begin(); i != _save->getUnits()->end(); ++i)
{
if (distance(position, (*i)->getPosition()) < MAX_VIEW_DISTANCE)
{
calculateFOV(*i);
}
}
}
/**
* Checks if a sniper from the opposing faction sees this unit. The unit with the highest reaction score will be compared with the current unit's reaction score.
* If it's higher, a shot is fired when enough time units, a weapon and ammo are available.
* @param unit The unit to check reaction fire upon.
* @return True if reaction fire took place.
*/
bool TileEngine::checkReactionFire(BattleUnit *unit)
{
// reaction fire only triggered when the actioning unit is of the currently playing side, and is still on the map (alive)
if (unit->getFaction() != _save->getSide() || unit->getTile() == 0)
{
return false;
}
std::vector<BattleUnit *> spotters = getSpottingUnits(unit);
bool result = false;
// not mind controlled, or controlled by the player
if (unit->getFaction() == unit->getOriginalFaction()
|| unit->getFaction() != FACTION_HOSTILE)
{
// get the first man up to bat.
BattleUnit *reactor = getReactor(spotters, unit);
// start iterating through the possible reactors until the current unit is the one with the highest score.
while (reactor != unit)
{
if (!tryReactionSnap(reactor, unit))
{
// can't make a reaction snapshot for whatever reason, boot this guy from the vector.
for (std::vector<BattleUnit *>::iterator i = spotters.begin(); i != spotters.end(); ++i)
{
if (*i == reactor)
{
spotters.erase(i);
break;
}
}
// avoid setting result to true, but carry on, just cause one unit can't react doesn't mean the rest of the units in the vector (if any) can't
reactor = getReactor(spotters, unit);
continue;
}
// nice shot, kid. don't get cocky.
reactor = getReactor(spotters, unit);
result = true;
}
}
return result;
}
/**
* Creates a vector of units that can spot this unit.
* @param unit The unit to check for spotters of.
* @return A vector of units that can see this unit.
*/
std::vector<BattleUnit *> TileEngine::getSpottingUnits(BattleUnit* unit)
{
std::vector<BattleUnit*> spotters;
Tile *tile = unit->getTile();
for (std::vector<BattleUnit*>::const_iterator i = _save->getUnits()->begin(); i != _save->getUnits()->end(); ++i)
{
// not dead/unconscious
if (!(*i)->isOut() &&
// not dying
(*i)->getHealth() != 0 &&
// not about to pass out
(*i)->getStunlevel() < (*i)->getHealth() &&
// not a friend
(*i)->getFaction() != _save->getSide() &&
// closer than 20 tiles
distance(unit->getPosition(), (*i)->getPosition()) <= MAX_VIEW_DISTANCE)
{
Position originVoxel = _save->getTileEngine()->getSightOriginVoxel(*i);
originVoxel.z -= 2;
Position targetVoxel;
AlienBAIState *aggro = dynamic_cast<AlienBAIState*>((*i)->getCurrentAIState());
bool gotHit = (aggro != 0 && aggro->getWasHitBy(unit->getId()));
// can actually see the target Tile, or we got hit
if (((*i)->checkViewSector(unit->getPosition()) || gotHit) &&
// can actually target the unit
canTargetUnit(&originVoxel, tile, &targetVoxel, *i) &&
// can actually see the unit
visible(*i, tile))
{
if ((*i)->getFaction() == FACTION_PLAYER)
{
unit->setVisible(true);
}
(*i)->addToVisibleUnits(unit);
// no reaction on civilian turn.
if (_save->getSide() != FACTION_NEUTRAL &&
canMakeSnap(*i, unit))
{
spotters.push_back(*i);
}
}
}
}
return spotters;
}
/**
* Gets the unit with the highest reaction score from the spotter vector.
* @param spotters The vector of spotting units.
* @param unit The unit to check scores against.
* @return The unit with the highest reactions.
*/
BattleUnit* TileEngine::getReactor(std::vector<BattleUnit *> spotters, BattleUnit *unit)
{
int bestScore = -1;
BattleUnit *bu = 0;
for (std::vector<BattleUnit *>::iterator i = spotters.begin(); i != spotters.end(); ++i)
{
if (!(*i)->isOut() &&
canMakeSnap(*i, unit) &&
(*i)->getReactionScore() > bestScore)
{
bestScore = (*i)->getReactionScore();
bu = *i;
}
}
if (unit->getReactionScore() <= bestScore)
{
if (bu->getOriginalFaction() == FACTION_PLAYER)
{
bu->addReactionExp();
}
}
else
{
bu = unit;
}
return bu;
}
/**
* Checks the validity of a snap shot performed here.
* @param unit The unit to check sight from.
* @param target The unit to check sight TO.
* @return True if the target is valid.
*/
bool TileEngine::canMakeSnap(BattleUnit *unit, BattleUnit *target)
{
BattleItem *weapon = unit->getMainHandWeapon();
// has a weapon
if (weapon &&
// has a melee weapon and is in melee range
((weapon->getRules()->getBattleType() == BT_MELEE &&
validMeleeRange(unit, target, unit->getDirection()) &&
unit->getTimeUnits() > unit->getActionTUs(BA_HIT, weapon)) ||
// has a gun capable of snap shot with ammo
(weapon->getRules()->getBattleType() != BT_MELEE &&
weapon->getRules()->getTUSnap() &&
weapon->getAmmoItem() &&
unit->getTimeUnits() > unit->getActionTUs(BA_SNAPSHOT, weapon))) &&
(unit->getOriginalFaction() != FACTION_PLAYER ||
_save->getGeoscapeSave()->isResearched(weapon->getRules()->getRequirements())))
{
return true;
}
return false;
}
/**
* Attempts to perform a reaction snap shot.
* @param unit The unit to check sight from.
* @param target The unit to check sight TO.
* @return True if the action should (theoretically) succeed.
*/
bool TileEngine::tryReactionSnap(BattleUnit *unit, BattleUnit *target)
{
BattleAction action;
action.cameraPosition = _save->getBattleState()->getMap()->getCamera()->getMapOffset();
action.actor = unit;
action.weapon = unit->getMainHandWeapon();
if (!action.weapon)
{
return false;
}
// reaction fire is ALWAYS snap shot.
action.type = BA_SNAPSHOT;
// unless we're a melee unit.
if (action.weapon->getRules()->getBattleType() == BT_MELEE)
{
action.type = BA_HIT;
}
action.target = target->getPosition();
action.TU = unit->getActionTUs(action.type, action.weapon);
if (action.weapon->getAmmoItem() && action.weapon->getAmmoItem()->getAmmoQuantity() && unit->getTimeUnits() >= action.TU)
{
action.targeting = true;
// hostile units will go into an "aggro" state when they react.
if (unit->getFaction() == FACTION_HOSTILE)
{
AlienBAIState *aggro = dynamic_cast<AlienBAIState*>(unit->getCurrentAIState());
if (aggro == 0)
{
// should not happen, but just in case...
aggro = new AlienBAIState(_save, unit, 0);
unit->setAIState(aggro);
}
if (action.weapon->getAmmoItem()->getRules()->getExplosionRadius() &&
aggro->explosiveEfficacy(action.target, unit, action.weapon->getAmmoItem()->getRules()->getExplosionRadius(), -1) == false)
{
action.targeting = false;
}
}
if (action.targeting && unit->spendTimeUnits(action.TU))
{
action.TU = 0;
_save->getBattleGame()->statePushBack(new UnitTurnBState(_save->getBattleGame(), action));
_save->getBattleGame()->statePushBack(new ProjectileFlyBState(_save->getBattleGame(), action));
return true;
}
}
return false;
}
/**
* Handles bullet/weapon hits.
*
* A bullet/weapon hits a voxel.