/**
* Kneel/Standup.
* @param action Pointer to an action.
*/
void BattlescapeState::btnKneelClick(Action *action)
{
if (_popup) return;
// TODO: check for timeunits... check for FOV...
BattleUnit *bu = _battleGame->getSelectedUnit();
if (bu)
{
if (bu->spendTimeUnits(bu->isKneeled()?8:4, _battleGame->getDebugMode()))
{
bu->kneel(!bu->isKneeled());
_map->cacheUnits();
updateSoldierInfo(bu);
}
}
}
/**
* calculateTrajectory.
* @return true when a trajectory is possible.
*/
bool Projectile::calculateTrajectory(double accuracy)
{
Position originVoxel, targetVoxel;
int direction;
int dirYshift[8] = {1, 1, 8, 15, 15, 15, 8, 1 };
int dirXshift[8] = {8, 14, 15, 15, 8, 1, 1, 1 };
// large units : x2
originVoxel = Position(_origin.x*16, _origin.y*16, _origin.z*24);
originVoxel.z += -_save->getTile(_origin)->getTerrainLevel();
BattleUnit *bu = _save->getTile(_origin)->getUnit();
originVoxel.z += bu->isKneeled()?bu->getUnit()->getKneelHeight():bu->getUnit()->getStandHeight();
originVoxel.z -= 3;
if (originVoxel.z >= (_origin.z + 1)*24)
{
_origin.z++;
}
direction = bu->getDirection();
originVoxel.x += dirXshift[direction];
originVoxel.y += 15-dirYshift[direction];
// determine the target voxel.
// aim at the center of the unit, the object, the walls or the floor (in that priority)
// if there is no LOF to the center, try elsewhere (more outward).
// Store this target voxel.
Tile *tile = _save->getTile(_target);
if (tile->getUnit() != 0)
{
if (_origin == _target)
{
targetVoxel = Position(_target.x*16 + 8, _target.y*16 + 8, _target.z*24);
}
else
{
targetVoxel = Position(_target.x*16 + 8, _target.y*16 + 8, _target.z*24 + tile->getUnit()->getUnit()->getStandHeight()/2);
}
}
else if (tile->getMapData(O_OBJECT) != 0)
{
targetVoxel = Position(_target.x*16 + 8, _target.y*16 + 8, _target.z*24 + 10);
}
else if (tile->getMapData(O_NORTHWALL) != 0)
{
targetVoxel = Position(_target.x*16 + 8, _target.y*16 + 16, _target.z*24 + 10);
}
else if (tile->getMapData(O_WESTWALL) != 0)
{
targetVoxel = Position(_target.x*16, _target.y*16 + 8, _target.z*24 + 10);
}
else if (tile->getMapData(O_FLOOR) != 0)
{
targetVoxel = Position(_target.x*16 + 8, _target.y*16 + 8, _target.z*24);
}
else
{
return false; // no line of fire
}
// apply some accuracy modifiers (todo: calculate this)
// This will results in a new target voxel
applyAccuracy(originVoxel, &targetVoxel, accuracy);
// finally do a line calculation and store this trajectory.
_save->getTerrainModifier()->calculateLine(originVoxel, targetVoxel, true, &_trajectory, bu);
return true;
}
/**
* applyAccuracy calculates the new target in voxel space, based on the given accuracy modifier.
* @param origin Startposition of the trajectory.
* @param target Endpoint of the trajectory.
* @param accuracy Accuracy modifier.
* @param targetTile Tile of target. Default = 0.
*/
void Projectile::applyAccuracy(const Position& origin, Position *target, double accuracy, bool keepRange, Tile *targetTile)
{
int xdiff = origin.x - target->x;
int ydiff = origin.y - target->y;
double realDistance = sqrt((double)(xdiff*xdiff)+(double)(ydiff*ydiff));
// maxRange is the maximum range a projectile shall ever travel in voxel space
double maxRange = keepRange?realDistance:16*1000; // 1000 tiles
maxRange = _action.type == BA_HIT?46:maxRange; // up to 2 tiles diagonally (as in the case of reaper v reaper)
if (Options::getBool("battleRangeBasedAccuracy"))
{
double baseDeviation, accuracyPenalty;
if (targetTile)
{
BattleUnit* targetUnit = targetTile->getUnit();
if (targetUnit && (targetUnit->getFaction() == FACTION_HOSTILE))
accuracyPenalty = 0.01 * targetTile->getShade(); // Shade can be from 0 to 15
else
accuracyPenalty = 0.0; // Enemy units can see in the dark.
// If unit is kneeled, then chance to hit them reduced on 5%. This is a compromise, because vertical deviation in 2 times less.
if (targetUnit && targetUnit->isKneeled())
accuracyPenalty += 0.05;
}
else
accuracyPenalty = 0.01 * _save->getGlobalShade(); // Shade can be from 0 (day) to 15 (night).
baseDeviation = -0.15 + (_action.type == BA_AUTOSHOT? 0.28 : 0.26) / (accuracy - accuracyPenalty + 0.25);
// 0.02 is the min angle deviation for best accuracy (+-3s = 0.02 radian).
if (baseDeviation < 0.02)
baseDeviation = 0.02;
// the angle deviations are spread using a normal distribution for baseDeviation (+-3s with precision 99,7%)
double dH = RNG::boxMuller(0.0, baseDeviation / 6.0); // horizontal miss in radian
double dV = RNG::boxMuller(0.0, baseDeviation /(6.0 * 2));
double te = atan2(double(target->y - origin.y), double(target->x - origin.x)) + dH;
double fi = atan2(double(target->z - origin.z), realDistance) + dV;
double cos_fi = cos(fi);
// It is a simple task - to hit in target width of 5-7 voxels. Good luck!
target->x = (int)(origin.x + maxRange * cos(te) * cos_fi);
target->y = (int)(origin.y + maxRange * sin(te) * cos_fi);
target->z = (int)(origin.z + maxRange * sin(fi));
return;
}
// maxDeviation is the max angle deviation for accuracy 0% in degrees
double maxDeviation = 2.5;
// minDeviation is the min angle deviation for accuracy 100% in degrees
double minDeviation = 0.4;
double dRot, dTilt;
double rotation, tilt;
double baseDeviation = (maxDeviation - (maxDeviation * accuracy)) + minDeviation;
// the angle deviations are spread using a normal distribution between 0 and baseDeviation
// check if we hit
if (RNG::generate(0.0, 1.0) < accuracy)
{
// we hit, so no deviation
dRot = 0;
dTilt = 0;
}
else
{
dRot = RNG::boxMuller(0, baseDeviation);
dTilt = RNG::boxMuller(0, baseDeviation / 2.0); // tilt deviation is halved
}
rotation = atan2(double(target->y - origin.y), double(target->x - origin.x)) * 180 / M_PI;
tilt = atan2(double(target->z - origin.z),
sqrt(double(target->x - origin.x)*double(target->x - origin.x)+double(target->y - origin.y)*double(target->y - origin.y))) * 180 / M_PI;
// add deviations
rotation += dRot;
tilt += dTilt;
// calculate new target
// this new target can be very far out of the map, but we don't care about that right now
double cos_fi = cos(tilt * M_PI / 180.0);
double sin_fi = sin(tilt * M_PI / 180.0);
double cos_te = cos(rotation * M_PI / 180.0);
double sin_te = sin(rotation * M_PI / 180.0);
target->x = (int)(origin.x + maxRange * cos_te * cos_fi);
target->y = (int)(origin.y + maxRange * sin_te * cos_fi);
target->z = (int)(origin.z + maxRange * sin_fi);
}