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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 <cmath>
#include "Projectile.h"
#include "TileEngine.h"
#include "Map.h"
#include "Camera.h"
#include "Particle.h"
#include "../fmath.h"
#include "../Engine/SurfaceSet.h"
#include "../Engine/Surface.h"
#include "../Resource/ResourcePack.h"
#include "../Ruleset/Unit.h"
#include "../Ruleset/RuleSoldier.h"
#include "../Ruleset/RuleItem.h"
#include "../Ruleset/MapData.h"
#include "../Savegame/BattleUnit.h"
#include "../Savegame/BattleItem.h"
#include "../Savegame/Soldier.h"
#include "../Savegame/SavedBattleGame.h"
#include "../Savegame/Tile.h"
#include "../Engine/RNG.h"
#include "../Engine/Options.h"
#include "../Ruleset/Armor.h"
#include "../Engine/Game.h"
namespace OpenXcom
{
/**
* Sets up a UnitSprite with the specified size and position.
* @param res Pointer to resourcepack.
* @param save Pointer to battlesavegame.
* @param action An action.
* @param origin Position the projectile originates from.
* @param targetVoxel Position the projectile is targeting.
* @param ammo the ammo that produced this projectile, where applicable.
*/
Projectile::Projectile(ResourcePack *res, SavedBattleGame *save, BattleAction action, Position origin, Position targetVoxel, BattleItem *ammo) : _res(res), _save(save), _action(action), _origin(origin), _targetVoxel(targetVoxel), _position(0), _bulletSprite(-1), _reversed(false), _vaporColor(-1), _vaporDensity(-1)
{
// this is the number of pixels the sprite will move between frames
_speed = Options::battleFireSpeed;
if (_action.weapon)
{
if (_action.type == BA_THROW)
{
_sprite = _res->getSurfaceSet("FLOOROB.PCK")->getFrame(getItem()->getRules()->getFloorSprite());
}
else
{
// try to get all the required info from the ammo, if present
if (ammo)
{
_bulletSprite = ammo->getRules()->getBulletSprite();
_vaporColor = ammo->getRules()->getVaporColor();
_vaporDensity = ammo->getRules()->getVaporDensity();
_speed = std::max(1, _speed + ammo->getRules()->getBulletSpeed());
}
// no ammo, or the ammo didn't contain the info we wanted, see what the weapon has on offer.
if (_bulletSprite == -1)
{
_bulletSprite = _action.weapon->getRules()->getBulletSprite();
}
if (_vaporColor == -1)
{
_vaporColor = _action.weapon->getRules()->getVaporColor();
}
if (_vaporDensity == -1)
{
_vaporDensity = _action.weapon->getRules()->getVaporDensity();
}
{
if (!ammo || (ammo != _action.weapon || ammo->getRules()->getBulletSpeed() == 0))
{
_speed = std::max(1, _speed + _action.weapon->getRules()->getBulletSpeed());
}
}
}
if ((targetVoxel.x - origin.x) + (targetVoxel.y - origin.y) >= 0)
{
_reversed = true;
}
}
/**
* Deletes the Projectile.
*/
Projectile::~Projectile()
{
}
/**
* Calculates the trajectory for a straight path.
* @param accuracy The unit's accuracy.
* @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 = _save->getTileEngine()->getOriginVoxel(_action, _save->getTile(_origin));
return calculateTrajectory(accuracy, originVoxel);
}
int Projectile::calculateTrajectory(double accuracy, Position originVoxel)
{
Tile *targetTile = _save->getTile(_action.target);
BattleUnit *bu = _action.actor;
int test = _save->getTileEngine()->calculateLine(originVoxel, _targetVoxel, false, &_trajectory, bu);
if (test != V_EMPTY &&
!_trajectory.empty() &&
_action.actor->getFaction() == FACTION_PLAYER &&
_action.autoShotCounter == 1 &&
((SDL_GetModState() & KMOD_CTRL) == 0 || !Options::forceFire) &&
_save->getBattleGame()->getPanicHandled() &&
_action.type != BA_LAUNCH)
{
Position hitPos = Position(_trajectory.at(0).x/16, _trajectory.at(0).y/16, _trajectory.at(0).z/24);
if (test == V_UNIT && _save->getTile(hitPos) && _save->getTile(hitPos)->getUnit() == 0) //no unit? must be lower
{
hitPos = Position(hitPos.x, hitPos.y, hitPos.z-1);
}
if (hitPos != _action.target && _action.result.empty())
{
if (test == V_NORTHWALL)
{
if (hitPos.y - 1 != _action.target.y)
{
_trajectory.clear();
return V_EMPTY;
}
}
else if (test == V_WESTWALL)
{
if (hitPos.x - 1 != _action.target.x)
{
_trajectory.clear();
return V_EMPTY;
}
}
else if (test == V_UNIT)
{
BattleUnit *hitUnit = _save->getTile(hitPos)->getUnit();
BattleUnit *targetUnit = targetTile->getUnit();
if (hitUnit != targetUnit)
{
_trajectory.clear();
return V_EMPTY;
}
}
else
{
_trajectory.clear();
return V_EMPTY;
}
}
}
_trajectory.clear();
bool extendLine = true;
// even guided missiles drift, but how much is based on
// the shooter's faction, rather than accuracy.
if (_action.type == BA_LAUNCH)
{
if (_action.actor->getFaction() == FACTION_PLAYER)
{
accuracy = 0.60;
}
else
{
accuracy = 0.55;
}
extendLine = _action.waypoints.size() <= 1;
}
// apply some accuracy modifiers.
// This will results in a new target voxel
applyAccuracy(originVoxel, &_targetVoxel, accuracy, false, targetTile, extendLine);
// finally do a line calculation and store this trajectory.
return _save->getTileEngine()->calculateLine(originVoxel, _targetVoxel, true, &_trajectory, bu);
}
/**
* Calculates the trajectory for a curved path.
* @param accuracy The unit's accuracy.
* @return True when a trajectory is possible.
*/
int Projectile::calculateThrow(double accuracy)
{
Tile *targetTile = _save->getTile(_action.target);
Position originVoxel = _save->getTileEngine()->getOriginVoxel(_action, 0);
Position targetVoxel = _action.target * Position(16,16,24) + Position(8,8, (2 + -targetTile->getTerrainLevel()));
if (_action.type != BA_THROW)
{
BattleUnit *tu = targetTile->getUnit();
if (!tu && _action.target.z > 0 && targetTile->hasNoFloor(0))
tu = _save->getTile(_action.target - Position(0, 0, 1))->getUnit();
if (tu)
{
targetVoxel.z += ((tu->getHeight()/2) + tu->getFloatHeight()) - 2;
}
}
double curvature = 0.0;
int retVal = V_OUTOFBOUNDS;
if (_save->getTileEngine()->validateThrow(_action, originVoxel, targetVoxel, &curvature, &retVal))
{
int test = V_OUTOFBOUNDS;
// finally do a line calculation and store this trajectory, make sure it's valid.
while (test == V_OUTOFBOUNDS)
{
Position deltas = targetVoxel;
// apply some accuracy modifiers
applyAccuracy(originVoxel, &deltas, accuracy, true, _save->getTile(_action.target), false); //calling for best flavor
deltas -= targetVoxel;
_trajectory.clear();
test = _save->getTileEngine()->calculateParabola(originVoxel, targetVoxel, true, &_trajectory, _action.actor, curvature, deltas);
Position endPoint = _trajectory.back();
endPoint.x /= 16;
endPoint.y /= 16;
endPoint.z /= 24;
Tile *endTile = _save->getTile(endPoint);
// check if the item would land on a tile with a blocking object
if (_action.type == BA_THROW
&& endTile
&& endTile->getMapData(MapData::O_OBJECT)
&& endTile->getMapData(MapData::O_OBJECT)->getTUCost(MT_WALK) == 255)
{
test = V_OUTOFBOUNDS;
}
}
return retVal;
}
return V_OUTOFBOUNDS;
}
/**
* Calculates the new target in voxel space, based on the given accuracy modifier.
* @param origin Startposition of the trajectory in voxels.
* @param target Endpoint of the trajectory in voxels.
* @param accuracy Accuracy modifier.
* @param keepRange Whether range affects accuracy.
* @param targetTile Tile of target. Default = 0.
* @param extendLine should this line get extended to maximum distance?
*/
void Projectile::applyAccuracy(const Position& origin, Position *target, double accuracy, bool keepRange, Tile *targetTile, bool extendLine)
{
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)
RuleItem *weapon = _action.weapon->getRules();
if (_action.type != BA_THROW && _action.type != BA_HIT)
{
double modifier = 0.0;
int upperLimit = weapon->getAimRange();
int lowerLimit = weapon->getMinRange();
if (Options::battleUFOExtenderAccuracy)
{
if (_action.type == BA_AUTOSHOT)
{
upperLimit = weapon->getAutoRange();
}
else if (_action.type == BA_SNAPSHOT)
{
upperLimit = weapon->getSnapRange();
}
}
if (realDistance / 16 < lowerLimit)
{
modifier = (weapon->getDropoff() * (lowerLimit - realDistance / 16)) / 100;
}
else if (upperLimit < realDistance / 16)
{
modifier = (weapon->getDropoff() * (realDistance / 16 - upperLimit)) / 100;
}
accuracy = std::max(0.0, accuracy - modifier);
}
int xDist = abs(origin.x - target->x);
int yDist = abs(origin.y - target->y);
int zDist = abs(origin.z - target->z);
int xyShift, zShift;
if (xDist / 2 <= yDist) //yes, we need to add some x/y non-uniformity
xyShift = xDist / 4 + yDist; //and don't ask why, please. it's The Commandment
else
xyShift = (xDist + yDist) / 2; //that's uniform part of spreading
if (xyShift <= zDist) //slight z deviation
zShift = xyShift / 2 + zDist;
else
zShift = xyShift + zDist / 2;
int deviation = RNG::generate(0, 100) - (accuracy * 100);
if (deviation >= 0)
deviation += 50; // add extra spread to "miss" cloud
else
deviation += 10; //accuracy of 109 or greater will become 1 (tightest spread)
deviation = std::max(1, zShift * deviation / 200); //range ratio
target->x += RNG::generate(0, deviation) - deviation / 2;
target->y += RNG::generate(0, deviation) - deviation / 2;
target->z += RNG::generate(0, deviation / 2) / 2 - deviation / 8;
if (extendLine)
{
double rotation, tilt;
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;
// 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);
}
}
/**
* Moves further in the trajectory.
* @return false if the trajectory is finished - no new position exists in the trajectory.
*/
bool Projectile::move()
{
for (int i = 0; i < _speed; ++i)
{
_position++;
if (_position == _trajectory.size())
{
_position--;
return false;
}
if (_save->getDepth() > 0 && _vaporColor != -1 && _action.type != BA_THROW && RNG::percent(5))
{
addVaporCloud();
}
}
return true;
}
/**
* Gets the current position in voxel space.
* @param offset Offset.
* @return Position in voxel space.
*/
Position Projectile::getPosition(int offset) const
{
int posOffset = (int)_position + offset;
if (posOffset >= 0 && posOffset < (int)_trajectory.size())
return _trajectory.at(posOffset);
else
return _trajectory.at(_position);
}
/**
* Gets a particle reference from the projectile surfaces.
* @param i Index.
* @return Particle id.
*/
int Projectile::getParticle(int i) const
{
if (_bulletSprite != -1)
return _bulletSprite + i;
else
return -1;
}
/**
* Gets the project tile item.
* Returns 0 when there is no item thrown.
* @return Pointer to BattleItem.
*/
BattleItem *Projectile::getItem() const
{
if (_action.type == BA_THROW)
return _action.weapon;
else
return 0;
}
/**
* Gets the bullet sprite.
* @return Pointer to Surface.
*/
Surface *Projectile::getSprite() const
{
return _sprite;
}
/**
* Skips to the end of the trajectory.
*/
void Projectile::skipTrajectory()
{
while (move());
}
/**
* Gets the Position of origin for the projectile
* @return origin as a tile position.
*/
Position Projectile::getOrigin()
{
// instead of using the actor's position, we'll use the voxel origin translated to a tile position
// this is a workaround for large units.
return _trajectory.front() / Position(16,16,24);
}
/**
* Gets the INTENDED target for this projectile
* it is important to note that we do not use the final position of the projectile here,
* but rather the targetted tile
* @return target as a tile position.
*/
Position Projectile::getTarget()
{
return _action.target;
}
/**
* Is this projectile drawn back to front or front to back?
* @retun return if this is to be drawn in reverse order.
*/
bool Projectile::isReversed() const
{
return _reversed;
}
/**
* adds a cloud of vapor at the projectile's current position.
*/
void Projectile::addVaporCloud()
{
Tile *tile = _save->getTile(_trajectory.at(_position) / Position(16,16,24));
if (tile)
{
Position tilePos, voxelPos;
_save->getBattleGame()->getMap()->getCamera()->convertMapToScreen(_trajectory.at(_position) / Position(16,16,24), &tilePos);
tilePos += _save->getBattleGame()->getMap()->getCamera()->getMapOffset();
_save->getBattleGame()->getMap()->getCamera()->convertVoxelToScreen(_trajectory.at(_position), &voxelPos);
for (int i = 0; i != _vaporDensity; ++i)
{
Particle *particle = new Particle(voxelPos.x - tilePos.x + RNG::generate(0, 6) - 3, voxelPos.y - tilePos.y + RNG::generate(0, 6) - 3, RNG::generate(64, 214), _vaporColor, 19);
tile->addParticle(particle);
}
}
}
}