/**
* calculateTrajectory.
* @return the objectnumber(0-3) or unit(4) or out of map (5) or -1(no line of fire)
*/
int Projectile::calculateTrajectory(double accuracy)
{
Position originVoxel, targetVoxel;
Tile *targetTile = 0;
int direction;
int dirYshift[24] = {1, 3, 9, 15, 15, 13, 7, 1, 1, 1, 7, 13, 15, 15, 9, 3, 1, 2, 8, 14, 15, 14, 8, 2};
int dirXshift[24] = {9, 15, 15, 13, 8, 1, 1, 3, 7, 13, 15, 15, 9, 3, 1, 1, 8, 14, 15, 14, 8, 2, 1, 2};
int offset = 0;
originVoxel = Position(_origin.x*16, _origin.y*16, _origin.z*24);
BattleUnit *bu = _action.actor;
if (bu->getArmor()->getSize() > 1)
{
offset = 16;
}
else if(_action.weapon == _action.weapon->getOwner()->getItem("STR_LEFT_HAND") && !_action.weapon->getRules()->isTwoHanded())
{
offset = 8;
}
// take into account soldier height and terrain level if the projectile is launched from a soldier
if (_action.actor->getPosition() == _origin)
{
// calculate offset of the starting point of the projectile
originVoxel.z += -_save->getTile(_origin)->getTerrainLevel();
originVoxel.z += bu->getHeight() + bu->getFloatHeight();
originVoxel.z -= 4;
if (originVoxel.z >= (_origin.z + 1)*24)
{
_origin.z++;
}
direction = bu->getDirection();
if (bu->getTurretType() != -1)
direction = bu->getTurretDirection();
originVoxel.x += dirXshift[direction+offset]*bu->getArmor()->getSize();
originVoxel.y += dirYshift[direction+offset]*bu->getArmor()->getSize();
}
else
{
// don't take into account soldier height and terrain level if the projectile is not launched from a soldier(from a waypoint)
originVoxel.x += 8;
originVoxel.y += 8;
originVoxel.z += 12;
}
if (_action.type == BA_LAUNCH || (SDL_GetModState() & KMOD_CTRL) != 0)
{
// target nothing, targets the middle of the tile
targetVoxel = Position(_action.target.x*16 + 8, _action.target.y*16 + 8, _action.target.z*24 + 12);
}
else
{
// 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.
targetTile = _save->getTile(_action.target);
Position hitPos;
int test = -1;
if (targetTile->getUnit() != 0)
{
if (_origin == _action.target || targetTile->getUnit() == _action.actor)
{
// don't shoot at yourself but shoot at the floor
targetVoxel = Position(_action.target.x*16 + 8, _action.target.y*16 + 8, _action.target.z*24);
}
else
{
_save->getTileEngine()->canTargetUnit(&originVoxel, targetTile, &targetVoxel, bu);
}
}
else if (targetTile->getMapData(MapData::O_OBJECT) != 0)
{
if (!_save->getTileEngine()->canTargetTile(&originVoxel, targetTile, MapData::O_OBJECT, &targetVoxel, bu))
{
targetVoxel = Position(_action.target.x*16 + 8, _action.target.y*16 + 8, _action.target.z*24 + 10);
}
}
else if (targetTile->getMapData(MapData::O_NORTHWALL) != 0)
{
if (!_save->getTileEngine()->canTargetTile(&originVoxel, targetTile, MapData::O_NORTHWALL, &targetVoxel, bu))
{
targetVoxel = Position(_action.target.x*16 + 8, _action.target.y*16, _action.target.z*24 + 9);
}
}
else if (targetTile->getMapData(MapData::O_WESTWALL) != 0)
{
if (!_save->getTileEngine()->canTargetTile(&originVoxel, targetTile, MapData::O_WESTWALL, &targetVoxel, bu))
{
targetVoxel = Position(_action.target.x*16, _action.target.y*16 + 8, _action.target.z*24 + 9);
}
}
else if (targetTile->getMapData(MapData::O_FLOOR) != 0)
{
if (!_save->getTileEngine()->canTargetTile(&originVoxel, targetTile, MapData::O_FLOOR, &targetVoxel, bu))
{
targetVoxel = Position(_action.target.x*16 + 8, _action.target.y*16 + 8, _action.target.z*24);
}
}
else
{
// target nothing, targets the middle of the tile
targetVoxel = Position(_action.target.x*16 + 8, _action.target.y*16 + 8, _action.target.z*24 + 10);
}
test = _save->getTileEngine()->calculateLine(originVoxel, targetVoxel, false, &_trajectory, bu);
if (test == 4 && !_trajectory.empty())
{
hitPos = Position(_trajectory.at(0).x/16, _trajectory.at(0).y/16, _trajectory.at(0).z/24);
if (_save->getTile(hitPos) && _save->getTile(hitPos)->getUnit() == 0) //no unit? must be lower
{
hitPos = Position(hitPos.x, hitPos.y, hitPos.z-1);
}
}
if (test != -1 && !_trajectory.empty() && _action.actor->getFaction() == FACTION_PLAYER && _action.autoShotCounter == 1)
{
//skip already estimated hitPos
if (test != 4)
{
hitPos = Position(_trajectory.at(0).x/16, _trajectory.at(0).y/16, _trajectory.at(0).z/24);
}
if (hitPos != _action.target && _action.result == "")
{
if (test == 2)
{
if (hitPos.y - 1 == _action.target.y)
{
_trajectory.clear();
return _save->getTileEngine()->calculateLine(originVoxel, targetVoxel, true, &_trajectory, bu);
}
}
if (test == 1)
{
if (hitPos.x - 1 == _action.target.x)
{
_trajectory.clear();
return _save->getTileEngine()->calculateLine(originVoxel, targetVoxel, true, &_trajectory, bu);
}
}
_trajectory.clear();
return -1;
}
}
_trajectory.clear();
}
// apply some accuracy modifiers (todo: calculate this)
// This will results in a new target voxel
if (_action.type != BA_LAUNCH)
applyAccuracy(originVoxel, &targetVoxel, accuracy, false, targetTile);
// finally do a line calculation and store this trajectory.
return _save->getTileEngine()->calculateLine(originVoxel, targetVoxel, true, &_trajectory, bu);
}
