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Copy pathsiege-engine.cpp
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2060 lines (1663 loc) · 56.4 KB
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#include "Core.h"
#include <Console.h>
#include <Export.h>
#include <Error.h>
#include <PluginManager.h>
#include <modules/Gui.h>
#include <modules/Screen.h>
#include <modules/Maps.h>
#include <modules/MapCache.h>
#include <modules/World.h>
#include <modules/Units.h>
#include <modules/Job.h>
#include <modules/Materials.h>
#include <modules/Random.h>
#include <LuaTools.h>
#include <TileTypes.h>
#include <vector>
#include <cstdio>
#include <stack>
#include <string>
#include <cmath>
#include <string.h>
#include <VTableInterpose.h>
#include "df/graphic.h"
#include "df/building_siegeenginest.h"
#include "df/builtin_mats.h"
#include "df/world.h"
#include "df/buildings_other_id.h"
#include "df/job.h"
#include "df/building_drawbuffer.h"
#include "df/ui.h"
#include "df/viewscreen_dwarfmodest.h"
#include "df/ui_build_selector.h"
#include "df/flow_info.h"
#include "df/report.h"
#include "df/proj_itemst.h"
#include "df/unit.h"
#include "df/unit_soul.h"
#include "df/unit_skill.h"
#include "df/physical_attribute_type.h"
#include "df/creature_raw.h"
#include "df/caste_raw.h"
#include "df/caste_raw_flags.h"
#include "df/identity.h"
#include "df/game_mode.h"
#include "df/unit_misc_trait.h"
#include "df/job.h"
#include "df/job_item.h"
#include "df/item_actual.h"
#include "df/items_other_id.h"
#include "df/building_stockpilest.h"
#include "df/stockpile_links.h"
#include "df/workshop_profile.h"
#include "df/strain_type.h"
#include "df/material.h"
#include "df/flow_type.h"
#include "df/invasion_info.h"
#include "MiscUtils.h"
using std::vector;
using std::string;
using std::stack;
using namespace DFHack;
using namespace df::enums;
using Screen::Pen;
DFHACK_PLUGIN("siege-engine");
REQUIRE_GLOBAL(gamemode);
REQUIRE_GLOBAL(gps);
REQUIRE_GLOBAL(world);
REQUIRE_GLOBAL(ui);
REQUIRE_GLOBAL(ui_build_selector);
REQUIRE_GLOBAL(process_jobs);
/*
Aiming is simulated by using a normal distribution to perturb X and Y.
The chance a normal distribution is within n*sigma of median is
erf(n/sqrt(2)). For direct hit, it must be within 0.5 tiles of
center, so it is erf(0.5/sigma/sqrt(2)) = erf(1/sigma/sqrt(8)).
Since it must hit in both X and Y, it must be squared, so final
is erf(1/sigma/sqrt(8))^2 = erf(skill*coeff/(distance*sqrt(8)))^2.
The chance to hit a RxR area is erf(skill*coeff*R/(distance*sqrt(8)))^2.
Catapults can fire between 30 and 100, and the projectile is supposed
to travel in an arc, and is thus harder to aim; yet they require a direct
hit unless using the feature for firing bins.
The coefficient of 30 gives the following probabilities:
| | Direct Hit | 3x3 Area Hit |
| | 30 50 100 | 30 50 100 |
| Novice | 15% 5% <5% | 75% 40% 10% |
| Adequate | 45% 20% 5% | 100% 85% 40% |
| Competent | 75% 40% 10% | 100% 100% 70% |
| Proficient | 100% 75% 30% | 100% 100% 95% |
| Professional | 100% 100% 80% | 100% 100% 100% |
| Legendary | 100% 100% 95% | 100% 100% 100% |
Original data:
* http://www.wolframalpha.com/input/?i=erf%2830*x%2Fsqrt%288%29%2F30%29^2%2C+erf%2830*x%2Fsqrt%288%29%2F50%29^2%2C+erf%2830*x%2Fsqrt%288%29%2F100%29^2%2C+x+from+0+to+15
* http://www.wolframalpha.com/input/?i=erf%2830*x*3%2Fsqrt%288%29%2F30%29^2%2C+erf%2830*x*3%2Fsqrt%288%29%2F50%29^2%2C+erf%2830*x*3%2Fsqrt%288%29%2F100%29^2%2C+x+from+0+to+6
Ballista can fire up to 200 tiles away, and can't use the bin method
to compensate for inaccuracy. On the other hand, it shoots straight
and should be easier to aim. It also damages everything in its path,
so the hit probability may be estimated using an 1D projection.
The coefficient of 48 gives the following probabilities:
| | Direct Hit | 1D Hit |
| | 30 50 100 200 | 30 50 100 200 |
| Novice | 25% 10% 5% <5% | 55% 35% 20% 10% |
| Adequate | 80% 45% 15% 5% | 90% 65% 40% 20% |
| Competent | 95% 70% 30% 8% | 100% 85% 50% 30% |
| Proficient | 100% 95% 65% 20% | 100% 100% 75% 45% |
| Accomplished | 100% 100% 95% 60% | 100% 100% 100% 75% |
| Legendary | 100% 100% 100% 85% | 100% 100% 100% 90% |
Original data:
* http://www.wolframalpha.com/input/?i=erf%2848*x%2Fsqrt%288%29%2F30%29^2%2C+erf%2848*x%2Fsqrt%288%29%2F50%29^2%2C+erf%2848*x%2Fsqrt%288%29%2F100%29^2%2C+erf%2848*x%2Fsqrt%288%29%2F200%29^2%2C+x+from+0+to+15
* http://www.wolframalpha.com/input/?i=erf%2848*x%2Fsqrt%288%29%2F30%29%2C+erf%2848*x%2Fsqrt%288%29%2F50%29%2C+erf%2848*x%2Fsqrt%288%29%2F100%29%2C+erf%2848*x%2Fsqrt%288%29%2F200%29%2C+x+from+0+to+15
Quality can increase range of both engines by 25% max, so it
also boosts aiming by 1.06x every step, up to 33.8% gain.
*/
/*
* Misc. utils
*/
static bool debug_mode = false;
static void setDebug(bool on)
{
debug_mode = on;
}
static void set_arrow_color(df::coord pos, int color)
{
auto tile = Maps::getTileOccupancy(pos);
if (tile)
tile->bits.arrow_color = color;
}
typedef std::pair<df::coord, df::coord> coord_range;
static void set_range(coord_range *target, df::coord p1, df::coord p2)
{
if (!p1.isValid() || !p2.isValid())
{
*target = coord_range();
}
else
{
target->first.x = std::min(p1.x, p2.x);
target->first.y = std::min(p1.y, p2.y);
target->first.z = std::min(p1.z, p2.z);
target->second.x = std::max(p1.x, p2.x);
target->second.y = std::max(p1.y, p2.y);
target->second.z = std::max(p1.z, p2.z);
}
}
static bool is_range_valid(const coord_range &target)
{
return target.first.isValid() && target.second.isValid();
}
static bool is_in_range(const coord_range &target, df::coord pos)
{
return target.first.isValid() && target.second.isValid() &&
target.first.x <= pos.x && pos.x <= target.second.x &&
target.first.y <= pos.y && pos.y <= target.second.y &&
target.first.z <= pos.z && pos.z <= target.second.z;
}
static std::pair<int, int> get_engine_range(df::building_siegeenginest *bld, float quality)
{
if (bld->type == siegeengine_type::Ballista)
return std::make_pair(1, 200 + int(10 * quality));
else
return std::make_pair(30 - int(quality), 100 + int(5 * quality));
}
static void orient_engine(df::building_siegeenginest *bld, df::coord target)
{
int dx = target.x - bld->centerx;
int dy = target.y - bld->centery;
if (abs(dx) > abs(dy))
bld->facing = (dx > 0) ?
df::building_siegeenginest::Right :
df::building_siegeenginest::Left;
else
bld->facing = (dy > 0) ?
df::building_siegeenginest::Down :
df::building_siegeenginest::Up;
}
static bool is_build_complete(df::building *bld)
{
return bld->getBuildStage() >= bld->getMaxBuildStage();
}
static float average_quality(df::building_actual *bld)
{
float quality = 0;
int count = 0;
for (size_t i = 0; i < bld->contained_items.size(); i++)
{
if (bld->contained_items[i]->use_mode != 2)
continue;
count++;
quality += bld->contained_items[i]->item->getQuality();
}
return count > 0 ? quality/count : 0;
}
static int point_distance(df::coord speed)
{
return std::max(abs(speed.x), std::max(abs(speed.y), abs(speed.z)));
}
inline void normalize(float &x, float &y, float &z)
{
float dist = sqrtf(x*x + y*y + z*z);
if (dist == 0.0f) return;
x /= dist; y /= dist; z /= dist;
}
static Random::MersenneRNG rng;
static void random_direction(float &x, float &y, float &z)
{
float vec[3];
rng.unitvector(vec, 3);
x = vec[0]; y = vec[1]; z = vec[2];
}
static double random_error()
{
// Irwin-Hall approximation to normal distribution with n = 3; varies in (-3,3)
return (rng.drandom0() + rng.drandom0() + rng.drandom0()) * 2.0 - 3.0;
}
// round() is only available in C++11
static int int_round (double val)
{
double frac = val - floor(val);
if (frac < 0.5)
return (int)floor(val);
else
return (int)ceil(val);
}
static const int WEAR_TICKS = 806400;
static bool apply_impact_damage(df::item *item, int minv, int maxv)
{
MaterialInfo info(item);
if (!info.isValid())
{
item->setWear(3);
return false;
}
auto &strength = info.material->strength;
// Use random strain type excluding COMPRESSIVE (conveniently last)
int type = rng.random(strain_type::COMPRESSIVE);
int power = minv + rng.random(maxv-minv+1);
// High elasticity materials just bend
if (strength.strain_at_yield[type] >= 5000)
return true;
// Instant fracture?
int fracture = strength.fracture[type];
if (fracture <= power || info.material->flags.is_set(material_flags::IS_GLASS))
{
item->setWear(3);
return false;
}
// Impact within elastic strain range?
int yield = strength.yield[type];
if (yield > power)
return true;
// Can wear?
auto actual = virtual_cast<df::item_actual>(item);
if (!actual)
return false;
// Transform plastic deformation to wear
int max_wear = WEAR_TICKS * 4;
int cur_wear = WEAR_TICKS * actual->wear + actual->wear_timer;
cur_wear += int64_t(power - yield)*max_wear/(fracture - yield);
if (cur_wear >= max_wear)
{
actual->wear = 3;
return false;
}
else
{
actual->wear = cur_wear / WEAR_TICKS;
actual->wear_timer = cur_wear % WEAR_TICKS;
return true;
}
}
/*
* Configuration object
*/
static bool enable_plugin();
struct EngineInfo {
int id;
df::building_siegeenginest *bld;
df::coord center;
coord_range building_rect;
float quality;
bool is_catapult;
int proj_speed, hit_delay;
std::pair<int, int> fire_range;
double sigma_coeff;
coord_range target;
df::job_item_vector_id ammo_vector_id;
df::item_type ammo_item_type;
int operator_id, operator_frame;
std::set<int> stockpiles;
df::stockpile_links links;
df::workshop_profile profile;
bool hasTarget() { return is_range_valid(target); }
bool onTarget(df::coord pos) { return is_in_range(target, pos); }
df::coord getTargetSize() { return target.second - target.first; }
bool isInRange(int dist) {
return dist >= fire_range.first && dist <= fire_range.second;
}
};
static std::map<df::building*, EngineInfo*> engines;
static std::map<df::coord, df::building*> coord_engines;
static EngineInfo *find_engine(df::building *bld, bool create = false)
{
auto ebld = strict_virtual_cast<df::building_siegeenginest>(bld);
if (!ebld)
return NULL;
auto &obj = engines[bld];
if (obj)
{
obj->bld = ebld;
return obj;
}
if (!create || !is_build_complete(bld))
return NULL;
obj = new EngineInfo();
obj->id = bld->id;
obj->bld = ebld;
obj->center = df::coord(bld->centerx, bld->centery, bld->z);
obj->building_rect = coord_range(
df::coord(bld->x1, bld->y1, bld->z),
df::coord(bld->x2, bld->y2, bld->z)
);
obj->quality = average_quality(ebld);
obj->is_catapult = (ebld->type == siegeengine_type::Catapult);
obj->proj_speed = 2;
obj->hit_delay = obj->is_catapult ? 2 : -1;
obj->fire_range = get_engine_range(ebld, obj->quality);
// Base coefficients per engine type, plus 6% exponential bonus per quality level
obj->sigma_coeff = (obj->is_catapult ? 30.0 : 48.0) * pow(1.06f, obj->quality);
obj->ammo_vector_id = job_item_vector_id::BOULDER;
obj->ammo_item_type = item_type::BOULDER;
obj->operator_id = obj->operator_frame = -1;
coord_engines[obj->center] = bld;
return obj;
}
static EngineInfo *find_engine(lua_State *L, int idx, bool create = false, bool silent = false)
{
auto bld = Lua::CheckDFObject<df::building_siegeenginest>(L, idx);
auto engine = find_engine(bld, create);
if (!engine && !silent)
luaL_error(L, "no such engine");
return engine;
}
static EngineInfo *find_engine(df::coord pos)
{
auto engine = find_engine(coord_engines[pos]);
if (engine)
{
auto bld0 = df::building::find(engine->id);
auto bld = strict_virtual_cast<df::building_siegeenginest>(bld0);
if (!bld)
return NULL;
engine->bld = bld;
}
return engine;
}
/*
* Configuration management
*/
static void clear_engines()
{
for (auto it = engines.begin(); it != engines.end(); ++it)
delete it->second;
engines.clear();
coord_engines.clear();
}
static void load_engines()
{
clear_engines();
std::vector<PersistentDataItem> vec;
World::GetPersistentData(&vec, "siege-engine/target/", true);
for (auto it = vec.begin(); it != vec.end(); ++it)
{
auto engine = find_engine(df::building::find(it->ival(0)), true);
if (!engine) continue;
engine->target.first = df::coord(it->ival(1), it->ival(2), it->ival(3));
engine->target.second = df::coord(it->ival(4), it->ival(5), it->ival(6));
}
World::GetPersistentData(&vec, "siege-engine/ammo/", true);
for (auto it = vec.begin(); it != vec.end(); ++it)
{
auto engine = find_engine(df::building::find(it->ival(0)), true);
if (!engine) continue;
engine->ammo_vector_id = (df::job_item_vector_id)it->ival(1);
engine->ammo_item_type = (df::item_type)it->ival(2);
}
World::GetPersistentData(&vec, "siege-engine/stockpiles/", true);
for (auto it = vec.begin(); it != vec.end(); ++it)
{
auto engine = find_engine(df::building::find(it->ival(0)), true);
if (!engine)
continue;
auto pile = df::building::find(it->ival(1));
if (!pile || pile->getType() != building_type::Stockpile)
{
World::DeletePersistentData(*it);
continue;;
}
engine->stockpiles.insert(it->ival(1));
}
World::GetPersistentData(&vec, "siege-engine/profiles/", true);
for (auto it = vec.begin(); it != vec.end(); ++it)
{
auto engine = find_engine(df::building::find(it->ival(0)), true);
if (!engine) continue;
engine->profile.min_level = it->ival(1);
engine->profile.max_level = it->ival(2);
}
World::GetPersistentData(&vec, "siege-engine/profile-workers/", true);
for (auto it = vec.begin(); it != vec.end(); ++it)
{
auto engine = find_engine(df::building::find(it->ival(0)), true);
if (!engine)
continue;
auto unit = df::unit::find(it->ival(1));
if (!unit || !Units::isCitizen(unit))
{
World::DeletePersistentData(*it);
continue;
}
engine->profile.permitted_workers.push_back(it->ival(1));
}
}
static int getTargetArea(lua_State *L)
{
auto engine = find_engine(L, 1, false, true);
if (engine && engine->hasTarget())
{
Lua::Push(L, engine->target.first);
Lua::Push(L, engine->target.second);
}
else
{
lua_pushnil(L);
lua_pushnil(L);
}
return 2;
}
static void clearTargetArea(df::building_siegeenginest *bld)
{
CHECK_NULL_POINTER(bld);
if (auto engine = find_engine(bld))
engine->target = coord_range();
auto key = stl_sprintf("siege-engine/target/%d", bld->id);
World::DeletePersistentData(World::GetPersistentData(key));
}
static bool setTargetArea(df::building_siegeenginest *bld, df::coord target_min, df::coord target_max)
{
CHECK_NULL_POINTER(bld);
CHECK_INVALID_ARGUMENT(target_min.isValid() && target_max.isValid());
CHECK_INVALID_ARGUMENT(is_build_complete(bld));
if (!enable_plugin())
return false;
auto key = stl_sprintf("siege-engine/target/%d", bld->id);
auto entry = World::GetPersistentData(key, NULL);
if (!entry.isValid())
return false;
auto engine = find_engine(bld, true);
set_range(&engine->target, target_min, target_max);
entry.ival(0) = bld->id;
entry.ival(1) = engine->target.first.x;
entry.ival(2) = engine->target.first.y;
entry.ival(3) = engine->target.first.z;
entry.ival(4) = engine->target.second.x;
entry.ival(5) = engine->target.second.y;
entry.ival(6) = engine->target.second.z;
df::coord sum = target_min + target_max;
orient_engine(bld, df::coord(sum.x/2, sum.y/2, sum.z/2));
return true;
}
static int getAmmoItem(lua_State *L)
{
auto engine = find_engine(L, 1, false, true);
if (!engine)
Lua::Push(L, item_type::BOULDER);
else
Lua::Push(L, engine->ammo_item_type);
return 1;
}
static int setAmmoItem(lua_State *L)
{
if (!enable_plugin())
return 0;
auto engine = find_engine(L, 1, true);
auto item_type = (df::item_type)luaL_optint(L, 2, item_type::BOULDER);
if (!is_valid_enum_item(item_type))
luaL_argerror(L, 2, "invalid item type");
auto key = stl_sprintf("siege-engine/ammo/%d", engine->id);
auto entry = World::GetPersistentData(key, NULL);
if (!entry.isValid())
return 0;
engine->ammo_vector_id = job_item_vector_id::IN_PLAY;
engine->ammo_item_type = item_type;
FOR_ENUM_ITEMS(job_item_vector_id, id)
{
auto other = ENUM_ATTR(job_item_vector_id, other, id);
auto type = ENUM_ATTR(items_other_id, item, other);
if (type == item_type)
{
engine->ammo_vector_id = id;
break;
}
}
entry.ival(0) = engine->id;
entry.ival(1) = engine->ammo_vector_id;
entry.ival(2) = engine->ammo_item_type;
lua_pushboolean(L, true);
return 1;
}
static void forgetStockpileLink(EngineInfo *engine, int pile_id)
{
engine->stockpiles.erase(pile_id);
auto key = stl_sprintf("siege-engine/stockpiles/%d/%d", engine->id, pile_id);
World::DeletePersistentData(World::GetPersistentData(key));
}
static void update_stockpile_links(EngineInfo *engine)
{
engine->links.take_from_pile.clear();
for (auto it = engine->stockpiles.begin(); it != engine->stockpiles.end(); )
{
int id = *it; ++it;
auto pile = df::building::find(id);
if (!pile || pile->getType() != building_type::Stockpile)
forgetStockpileLink(engine, id);
else
// The vector is sorted, but we are iterating through a sorted set
engine->links.take_from_pile.push_back(pile);
}
}
static int getStockpileLinks(lua_State *L)
{
auto engine = find_engine(L, 1, false, true);
if (!engine || engine->stockpiles.empty())
return 0;
update_stockpile_links(engine);
auto &links = engine->links.take_from_pile;
lua_createtable(L, links.size(), 0);
for (size_t i = 0; i < links.size(); i++)
{
Lua::Push(L, links[i]);
lua_rawseti(L, -2, i+1);
}
return 1;
}
static bool isLinkedToPile(df::building_siegeenginest *bld, df::building_stockpilest *pile)
{
CHECK_NULL_POINTER(bld);
CHECK_NULL_POINTER(pile);
auto engine = find_engine(bld);
return engine && engine->stockpiles.count(pile->id);
}
static bool addStockpileLink(df::building_siegeenginest *bld, df::building_stockpilest *pile)
{
CHECK_NULL_POINTER(bld);
CHECK_NULL_POINTER(pile);
CHECK_INVALID_ARGUMENT(is_build_complete(bld));
if (!enable_plugin())
return false;
auto key = stl_sprintf("siege-engine/stockpiles/%d/%d", bld->id, pile->id);
auto entry = World::GetPersistentData(key, NULL);
if (!entry.isValid())
return false;
auto engine = find_engine(bld, true);
entry.ival(0) = bld->id;
entry.ival(1) = pile->id;
engine->stockpiles.insert(pile->id);
return true;
}
static bool removeStockpileLink(df::building_siegeenginest *bld, df::building_stockpilest *pile)
{
CHECK_NULL_POINTER(bld);
CHECK_NULL_POINTER(pile);
if (auto engine = find_engine(bld))
{
forgetStockpileLink(engine, pile->id);
return true;
}
return false;
}
static df::workshop_profile *saveWorkshopProfile(df::building_siegeenginest *bld)
{
CHECK_NULL_POINTER(bld);
CHECK_INVALID_ARGUMENT(is_build_complete(bld));
if (!enable_plugin())
return NULL;
// Save skill limits
auto key = stl_sprintf("siege-engine/profiles/%d", bld->id);
auto entry = World::GetPersistentData(key, NULL);
if (!entry.isValid())
return NULL;
auto engine = find_engine(bld, true);
entry.ival(0) = engine->id;
entry.ival(1) = engine->profile.min_level;
entry.ival(2) = engine->profile.max_level;
// Save worker list
std::vector<PersistentDataItem> vec;
auto &workers = engine->profile.permitted_workers;
key = stl_sprintf("siege-engine/profile-workers/%d", bld->id);
World::GetPersistentData(&vec, key, true);
for (auto it = vec.begin(); it != vec.end(); ++it)
{
if (linear_index(workers, it->ival(1)) < 0)
World::DeletePersistentData(*it);
}
for (size_t i = 0; i < workers.size(); i++)
{
key = stl_sprintf("siege-engine/profile-workers/%d/%d", bld->id, workers[i]);
entry = World::GetPersistentData(key, NULL);
if (!entry.isValid())
continue;
entry.ival(0) = engine->id;
entry.ival(1) = workers[i];
}
return &engine->profile;
}
static df::unit *getOperatorUnit(df::building_siegeenginest *bld, bool force = false)
{
CHECK_NULL_POINTER(bld);
auto engine = find_engine(bld);
if (!engine)
return NULL;
if (engine->operator_id != -1 &&
(world->frame_counter - engine->operator_frame) <= 5)
{
auto op_unit = df::unit::find(engine->operator_id);
if (op_unit)
return op_unit;
}
if (force)
{
color_ostream_proxy out(Core::getInstance().getConsole());
out.print("Forced siege operator search\n");
auto &active = world->units.active;
for (size_t i = 0; i < active.size(); i++)
if (active[i]->pos == engine->center && Units::isCitizen(active[i]))
return active[i];
}
return NULL;
}
/*
* Trajectory raytracing
*/
struct ProjectilePath {
static const int DEFAULT_FUDGE = 31;
df::coord origin, goal, target, fudge_delta;
int divisor, fudge_factor;
df::coord speed, direction;
ProjectilePath(df::coord origin, df::coord goal) :
origin(origin), goal(goal), fudge_factor(1)
{
fudge_delta = df::coord(0,0,0);
calc_line();
}
ProjectilePath(df::coord origin, df::coord goal, df::coord delta, int factor) :
origin(origin), goal(goal), fudge_delta(delta), fudge_factor(factor)
{
calc_line();
}
ProjectilePath(df::coord origin, df::coord goal, float zdelta, int factor = DEFAULT_FUDGE) :
origin(origin), goal(goal), fudge_factor(factor)
{
fudge_delta = df::coord(0,0,int(factor * zdelta));
calc_line();
}
void calc_line()
{
speed = goal - origin;
speed.x *= fudge_factor;
speed.y *= fudge_factor;
speed.z *= fudge_factor;
speed = speed + fudge_delta;
target = origin + speed;
divisor = point_distance(speed);
if (divisor <= 0) divisor = 1;
direction = df::coord(speed.x>=0?1:-1,speed.y>=0?1:-1,speed.z>=0?1:-1);
}
df::coord operator[] (int i) const
{
int div2 = divisor * 2;
int bias = divisor-1;
return origin + df::coord(
(2*speed.x*i + direction.x*bias)/div2,
(2*speed.y*i + direction.y*bias)/div2,
(2*speed.z*i + direction.z*bias)/div2
);
}
};
static ProjectilePath decode_path(lua_State *L, int idx, df::coord origin)
{
idx = lua_absindex(L, idx);
Lua::StackUnwinder frame(L);
df::coord goal;
lua_getfield(L, idx, "target");
Lua::CheckDFAssign(L, &goal, frame[1]);
lua_getfield(L, idx, "delta");
if (!lua_isnil(L, frame[2]))
{
lua_getfield(L, idx, "factor");
int factor = luaL_optnumber(L, frame[3], ProjectilePath::DEFAULT_FUDGE);
if (lua_isnumber(L, frame[2]))
return ProjectilePath(origin, goal, lua_tonumber(L, frame[2]), factor);
df::coord delta;
Lua::CheckDFAssign(L, &delta, frame[2]);
return ProjectilePath(origin, goal, delta, factor);
}
return ProjectilePath(origin, goal);
}
static int projPosAtStep(lua_State *L)
{
auto engine = find_engine(L, 1);
auto path = decode_path(L, 2, engine->center);
int step = luaL_checkint(L, 3);
Lua::Push(L, path[step]);
return 1;
}
static bool isPassableTile(df::coord pos)
{
auto ptile = Maps::getTileType(pos);
return !ptile || FlowPassable(*ptile);
}
static bool isTargetableTile(df::coord pos)
{
auto ptile = Maps::getTileType(pos);
return ptile && FlowPassable(*ptile) && !isOpenTerrain(*ptile);
}
static bool isTreeTile(df::coord pos)
{
auto ptile = Maps::getTileType(pos);
return ptile &&
(tileShape(*ptile) == tiletype_shape::BRANCH ||
tileShape(*ptile) == tiletype_shape::TRUNK_BRANCH ||
tileShape(*ptile) == tiletype_shape::TWIG);
}
static bool adjustToTarget(EngineInfo *engine, df::coord *pos)
{
if (isTargetableTile(*pos))
return true;
for (df::coord fudge = *pos;
fudge.z <= engine->target.second.z; fudge.z++)
{
if (!isTargetableTile(fudge))
continue;
*pos = fudge;
return true;
}
for (df::coord fudge = *pos;
fudge.z >= engine->target.first.z; fudge.z--)
{
if (!isTargetableTile(fudge))
continue;
*pos = fudge;
return true;
}
return false;
}
static int adjustToTarget(lua_State *L)
{
auto engine = find_engine(L, 1, true);
df::coord pos;
Lua::CheckDFAssign(L, &pos, 2);
bool ok = adjustToTarget(engine, &pos);
Lua::Push(L, pos);
Lua::Push(L, ok);
return 2;
}
static const char* const hit_type_names[] = {
"wall", "floor", "ceiling", "map_edge", "tree"
};
struct PathMetrics {
enum CollisionType {
Impassable,
Floor,
Ceiling,
MapEdge,
Tree
} hit_type;
int collision_step, collision_z_step;
int goal_step, goal_z_step, goal_distance;
bool hits() const { return collision_step > goal_step; }
PathMetrics(const ProjectilePath &path)
{
compute(path);
}
void compute(const ProjectilePath &path)
{
hit_type = Impassable;
collision_step = goal_step = goal_z_step = 1000000;
collision_z_step = 0;
goal_distance = point_distance(path.origin - path.goal);
int step = 0;
df::coord prev_pos = path.origin;
for (;;) {
df::coord cur_pos = path[++step];
if (cur_pos == prev_pos)
break;
if (cur_pos.z == path.goal.z)
{
goal_z_step = std::min(step, goal_z_step);
if (cur_pos == path.goal)
goal_step = step;
}
if (!Maps::isValidTilePos(cur_pos))
{
hit_type = PathMetrics::MapEdge;
break;
}
if (!isPassableTile(cur_pos))
{
if (isTreeTile(cur_pos))
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