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3108 lines (2881 loc) · 96 KB
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/*
* Copyright 2010-2016 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/>.
*/
#include <assert.h>
#include <climits>
#include <set>
#include "TileEngine.h"
#include <SDL.h>
#include "AIModule.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 "../Engine/RNG.h"
#include "BattlescapeState.h"
#include "../Mod/MapDataSet.h"
#include "../Mod/Unit.h"
#include "../Mod/Mod.h"
#include "../Mod/Armor.h"
#include "Pathfinding.h"
#include "../Engine/Options.h"
#include "ProjectileFlyBState.h"
#include "MeleeAttackBState.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), _cacheTile(0), _cacheTileBelow(0)
{
_cacheTilePos = Position(-1,-1,-1);
}
/**
* 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.
* TODO: angle the shadow according to the time? - link to Options::globeSeasons (or whatever the realistic lighting one is)
* @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)), O_FLOOR, DT_NONE);
block += blockage(_save->getTile(Position(x, y, z)), 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(O_FLOOR)
&& _save->getTiles()[i]->getMapData(O_FLOOR)->getLightSource())
{
addLight(_save->getTiles()[i]->getPosition(), _save->getTiles()[i]->getMapData(O_FLOOR)->getLightSource(), layer);
}
if (_save->getTiles()[i]->getMapData(O_OBJECT)
&& _save->getTiles()[i]->getMapData(O_OBJECT)->getLightSource())
{
addLight(_save->getTiles()[i]->getPosition(), _save->getTiles()[i]->getMapData(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(Position center, 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)
{
Tile *tileAbove = _save->getTile(pos + Position(0,0,1));
if (tileAbove && tileAbove->hasNoFloor(0))
{
++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_SQR)
{
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) ||
distance(currentUnit->getPosition(), tile->getPosition()) > MAX_VIEW_DISTANCE)
{
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 > (unsigned)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[] = {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 < 3; ++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[] = {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 = 0, maxZ = 0;
bool minZfound = false, maxZfound = false;
if (part == O_OBJECT)
{
spiralArray = sliceObjectSpiral;
spiralCount = 41;
}
else
if (part == O_NORTHWALL)
{
spiralArray = northWallSpiral;
spiralCount = 7;
}
else
if (part == O_WESTWALL)
{
spiralArray = westWallSpiral;
spiralCount = 7;
}
else if (part == O_FLOOR)
{
spiralArray = sliceObjectSpiral;
spiralCount = 41;
minZfound = true; minZ=0;
maxZfound = true; maxZ=0;
}
else
{
return false;
}
voxelCheckFlush();
// 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;
if (rangeZ>10) rangeZ = 10; //as above, clamping height range to prevent buffer overflow
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(Position position)
{
for (std::vector<BattleUnit*>::iterator i = _save->getUnits()->begin(); i != _save->getUnits()->end(); ++i)
{
if (distanceSq(position, (*i)->getPosition()) <= MAX_VIEW_DISTANCE_SQR)
{
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<std::pair<BattleUnit *, int> > 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.
int attackType;
BattleUnit *reactor = getReactor(spotters, attackType, unit);
// start iterating through the possible reactors until the current unit is the one with the highest score.
while (reactor != unit)
{
if (!tryReaction(reactor, unit, attackType))
{
// can't make a reaction snapshot for whatever reason, boot this guy from the vector.
for (std::vector<std::pair<BattleUnit *, int> >::iterator i = spotters.begin(); i != spotters.end(); ++i)
{
if ((*i).first == 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, attackType, unit);
continue;
}
// nice shot, kid. don't get cocky.
reactor = getReactor(spotters, attackType, 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<std::pair<BattleUnit *, int> > TileEngine::getSpottingUnits(BattleUnit* unit)
{
std::vector<std::pair<BattleUnit *, int> > spotters;
Tile *tile = unit->getTile();
// no reaction on civilian turn.
if (_save->getSide() != FACTION_NEUTRAL)
{
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() &&
// not a civilian
(*i)->getFaction() != FACTION_NEUTRAL &&
// closer than 20 tiles
distanceSq(unit->getPosition(), (*i)->getPosition()) <= MAX_VIEW_DISTANCE_SQR)
{
BattleAction falseAction;
falseAction.type = BA_SNAPSHOT;
falseAction.actor = *i;
falseAction.target = unit->getPosition();
Position originVoxel = getOriginVoxel(falseAction, 0);
Position targetVoxel;
AIModule *ai = (*i)->getAIModule();
// Inquisitor's note regarding 'gotHit' variable
// in vanilla, the 'hitState' flag is the only part of this equation that comes into play.
// any time a unit takes damage, this flag is set, then it would be reset by a call to
// a function analogous to SavedBattleGame::resetUnitHitStates(), any time:
// 1: a unit was selected by being clicked on.
// 2: either "next unit" button was pressed.
// 3: the inventory screen was accessed. (i didn't look too far into this one, it's possible it's only called in the pre-mission equip screen)
// 4: the same place where we call it, immediately before every move the AI makes.
// this flag is responsible for units turning around to respond to hits, and is in keeping with the details listed on http://www.ufopaedia.org/index.php/Reaction_fire_triggers
// we've gone for a slightly different implementation: AI units keep a list of which units have hit them and don't forget until the end of the player's turn.
// this method is in keeping with the spirit of the original feature, but much less exploitable by players.
// the hitState flag in our implementation allows player units to turn and react as they did in the original, (which is far less cumbersome than giving them all an AI module)
// we don't extend the same "enhanced aggressor memory" courtesy to players, because in the original, they could only turn and react to damage immediately after it happened.
// this is because as much as we want the player's soldiers dead, we don't want them to feel like we're being unfair about it.
bool gotHit = (ai != 0 && ai->getWasHitBy(unit->getId())) || (ai == 0 && (*i)->getHitState());
// 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);
int attackType = determineReactionType(*i, unit);
if (attackType != BA_NONE)
{
spotters.push_back(std::make_pair(*i, attackType));
}
}
}
}
}
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<std::pair<BattleUnit *, int> > spotters, int &attackType, BattleUnit *unit)
{
int bestScore = -1;
BattleUnit *bu = 0;
for (std::vector<std::pair<BattleUnit *, int> >::iterator i = spotters.begin(); i != spotters.end(); ++i)
{
if (!(*i).first->isOut() &&
!(*i).first->getRespawn() &&
determineReactionType((*i).first, unit) != BA_NONE &&
(*i).first->getReactionScore() > bestScore)
{
bestScore = (*i).first->getReactionScore();
bu = (*i).first;
attackType = (*i).second;
}
}
if (unit->getReactionScore() <= bestScore)
{
if (bu->getOriginalFaction() == FACTION_PLAYER)
{
bu->addReactionExp();
}
}
else
{
bu = unit;
attackType = BA_NONE;
}
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.
*/
int TileEngine::determineReactionType(BattleUnit *unit, BattleUnit *target)
{
// prioritize melee
BattleItem *meleeWeapon = unit->getMeleeWeapon();
if (meleeWeapon &&
// has a melee weapon and is in melee range
validMeleeRange(unit, target, unit->getDirection()) &&
unit->getActionTUs(BA_HIT, meleeWeapon) > 0 &&
unit->getTimeUnits() > unit->getActionTUs(BA_HIT, meleeWeapon) &&
(unit->getOriginalFaction() != FACTION_PLAYER ||
_save->getGeoscapeSave()->isResearched(meleeWeapon->getRules()->getRequirements())) &&
_save->isItemUsable(meleeWeapon->getRules()))
{
return BA_HIT;
}
BattleItem *weapon = unit->getMainHandWeapon(unit->getFaction() != FACTION_PLAYER);
// has a weapon
if (weapon &&
// has a gun capable of snap shot with ammo
(weapon->getRules()->getBattleType() != BT_MELEE &&
weapon->getRules()->getTUSnap() &&
distance(unit->getPosition(), target->getPosition()) < weapon->getRules()->getMaxRange() &&
weapon->getAmmoItem() &&
unit->getActionTUs(BA_SNAPSHOT, weapon) > 0 &&
unit->getTimeUnits() > unit->getActionTUs(BA_SNAPSHOT, weapon)) &&
(unit->getOriginalFaction() != FACTION_PLAYER ||
_save->getGeoscapeSave()->isResearched(weapon->getRules()->getRequirements())) &&
_save->isItemUsable(weapon->getRules()))
{
return BA_SNAPSHOT;
}
return BA_NONE;
}
/**
* 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::tryReaction(BattleUnit *unit, BattleUnit *target, int attackType)
{
BattleAction action;
action.cameraPosition = _save->getBattleState()->getMap()->getCamera()->getMapOffset();
action.actor = unit;
if (attackType == BA_HIT)
{
action.weapon = unit->getMeleeWeapon();
}
else
{
action.weapon = unit->getMainHandWeapon(unit->getFaction() != FACTION_PLAYER);
}