Files
@ r21475:389627bb83bb
Branch filter:
Location: cpp/openttd-patchpack/source/src/linkgraph/linkgraph.cpp
r21475:389627bb83bb
10.0 KiB
text/x-c
(svn r26584) -Codechange: [Squirrel] Make the internal integer for scripts always 64 bits, so scripts behave the same on 32 or 64 bits architectures
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 | /* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD 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, version 2.
* OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file linkgraph.cpp Definition of link graph classes used for cargo distribution. */
#include "../stdafx.h"
#include "../core/pool_func.hpp"
#include "linkgraph.h"
#include "../safeguards.h"
/* Initialize the link-graph-pool */
LinkGraphPool _link_graph_pool("LinkGraph");
INSTANTIATE_POOL_METHODS(LinkGraph)
/**
* Create a node or clear it.
* @param st ID of the associated station.
* @param demand Demand for cargo at the station.
*/
inline void LinkGraph::BaseNode::Init(StationID st, uint demand)
{
this->supply = 0;
this->demand = demand;
this->station = st;
this->last_update = INVALID_DATE;
}
/**
* Create an edge.
* @param distance Length of the link as manhattan distance.
*/
inline void LinkGraph::BaseEdge::Init(uint distance)
{
this->distance = distance;
this->capacity = 0;
this->usage = 0;
this->last_unrestricted_update = INVALID_DATE;
this->last_restricted_update = INVALID_DATE;
this->next_edge = INVALID_NODE;
}
/**
* Shift all dates by given interval.
* This is useful if the date has been modified with the cheat menu.
* @param interval Number of days to be added or subtracted.
*/
void LinkGraph::ShiftDates(int interval)
{
this->last_compression += interval;
for (NodeID node1 = 0; node1 < this->Size(); ++node1) {
BaseNode &source = this->nodes[node1];
if (source.last_update != INVALID_DATE) source.last_update += interval;
for (NodeID node2 = 0; node2 < this->Size(); ++node2) {
BaseEdge &edge = this->edges[node1][node2];
if (edge.last_unrestricted_update != INVALID_DATE) edge.last_unrestricted_update += interval;
if (edge.last_restricted_update != INVALID_DATE) edge.last_restricted_update += interval;
}
}
}
void LinkGraph::Compress()
{
this->last_compression = (_date + this->last_compression) / 2;
for (NodeID node1 = 0; node1 < this->Size(); ++node1) {
this->nodes[node1].supply /= 2;
for (NodeID node2 = 0; node2 < this->Size(); ++node2) {
BaseEdge &edge = this->edges[node1][node2];
if (edge.capacity > 0) {
edge.capacity = max(1U, edge.capacity / 2);
edge.usage /= 2;
}
}
}
}
/**
* Merge a link graph with another one.
* @param other LinkGraph to be merged into this one.
*/
void LinkGraph::Merge(LinkGraph *other)
{
Date age = _date - this->last_compression + 1;
Date other_age = _date - other->last_compression + 1;
NodeID first = this->Size();
for (NodeID node1 = 0; node1 < other->Size(); ++node1) {
Station *st = Station::Get(other->nodes[node1].station);
NodeID new_node = this->AddNode(st);
this->nodes[new_node].supply = LinkGraph::Scale(other->nodes[node1].supply, age, other_age);
st->goods[this->cargo].link_graph = this->index;
st->goods[this->cargo].node = new_node;
for (NodeID node2 = 0; node2 < node1; ++node2) {
BaseEdge &forward = this->edges[new_node][first + node2];
BaseEdge &backward = this->edges[first + node2][new_node];
forward = other->edges[node1][node2];
backward = other->edges[node2][node1];
forward.capacity = LinkGraph::Scale(forward.capacity, age, other_age);
forward.usage = LinkGraph::Scale(forward.usage, age, other_age);
if (forward.next_edge != INVALID_NODE) forward.next_edge += first;
backward.capacity = LinkGraph::Scale(backward.capacity, age, other_age);
backward.usage = LinkGraph::Scale(backward.usage, age, other_age);
if (backward.next_edge != INVALID_NODE) backward.next_edge += first;
}
BaseEdge &new_start = this->edges[new_node][new_node];
new_start = other->edges[node1][node1];
if (new_start.next_edge != INVALID_NODE) new_start.next_edge += first;
}
delete other;
}
/**
* Remove a node from the link graph by overwriting it with the last node.
* @param id ID of the node to be removed.
*/
void LinkGraph::RemoveNode(NodeID id)
{
assert(id < this->Size());
NodeID last_node = this->Size() - 1;
for (NodeID i = 0; i <= last_node; ++i) {
(*this)[i].RemoveEdge(id);
BaseEdge *node_edges = this->edges[i];
NodeID prev = i;
NodeID next = node_edges[i].next_edge;
while (next != INVALID_NODE) {
if (next == last_node) {
node_edges[prev].next_edge = id;
break;
}
prev = next;
next = node_edges[prev].next_edge;
}
node_edges[id] = node_edges[last_node];
}
Station::Get(this->nodes[last_node].station)->goods[this->cargo].node = id;
this->nodes.Erase(this->nodes.Get(id));
this->edges.EraseColumn(id);
/* Not doing EraseRow here, as having the extra invalid row doesn't hurt
* and removing it would trigger a lot of memmove. The data has already
* been copied around in the loop above. */
}
/**
* Update distances between the given node and all others.
* @param id Node that changed position.
* @param xy New position of the node.
*/
void LinkGraph::UpdateDistances(NodeID id, TileIndex xy)
{
assert(id < this->Size());
for (NodeID other = 0; other < this->Size(); ++other) {
if (other == id) continue;
this->edges[id][other].distance = this->edges[other][id].distance =
DistanceMaxPlusManhattan(xy, Station::Get(this->nodes[other].station)->xy);
}
}
/**
* Add a node to the component and create empty edges associated with it. Set
* the station's last_component to this component. Calculate the distances to all
* other nodes. The distances to _all_ nodes are important as the demand
* calculator relies on their availability.
* @param st New node's station.
* @return New node's ID.
*/
NodeID LinkGraph::AddNode(const Station *st)
{
const GoodsEntry &good = st->goods[this->cargo];
NodeID new_node = this->Size();
this->nodes.Append();
/* Avoid reducing the height of the matrix as that is expensive and we
* most likely will increase it again later which is again expensive. */
this->edges.Resize(new_node + 1U,
max(new_node + 1U, this->edges.Height()));
this->nodes[new_node].Init(st->index,
HasBit(good.status, GoodsEntry::GES_ACCEPTANCE));
BaseEdge *new_edges = this->edges[new_node];
/* Reset the first edge starting at the new node */
new_edges[new_node].next_edge = INVALID_NODE;
for (NodeID i = 0; i <= new_node; ++i) {
uint distance = DistanceMaxPlusManhattan(st->xy, Station::Get(this->nodes[i].station)->xy);
new_edges[i].Init(distance);
this->edges[i][new_node].Init(distance);
}
return new_node;
}
/**
* Fill an edge with values from a link. Set the restricted or unrestricted
* update timestamp according to the given update mode.
* @param to Destination node of the link.
* @param capacity Capacity of the link.
* @param usage Usage to be added.
* @param mode Update mode to be used.
*/
void LinkGraph::Node::AddEdge(NodeID to, uint capacity, uint usage, EdgeUpdateMode mode)
{
assert(this->index != to);
BaseEdge &edge = this->edges[to];
BaseEdge &first = this->edges[this->index];
edge.capacity = capacity;
edge.usage = usage;
edge.next_edge = first.next_edge;
first.next_edge = to;
if (mode & EUM_UNRESTRICTED) edge.last_unrestricted_update = _date;
if (mode & EUM_RESTRICTED) edge.last_restricted_update = _date;
}
/**
* Creates an edge if none exists yet or updates an existing edge.
* @param to Target node.
* @param capacity Capacity of the link.
* @param usage Usage to be added.
* @param mode Update mode to be used.
*/
void LinkGraph::Node::UpdateEdge(NodeID to, uint capacity, uint usage, EdgeUpdateMode mode)
{
assert(capacity > 0);
assert(usage <= capacity);
if (this->edges[to].capacity == 0) {
this->AddEdge(to, capacity, usage, mode);
} else {
(*this)[to].Update(capacity, usage, mode);
}
}
/**
* Remove an outgoing edge from this node.
* @param to ID of destination node.
*/
void LinkGraph::Node::RemoveEdge(NodeID to)
{
if (this->index == to) return;
BaseEdge &edge = this->edges[to];
edge.capacity = 0;
edge.last_unrestricted_update = INVALID_DATE;
edge.last_restricted_update = INVALID_DATE;
edge.usage = 0;
NodeID prev = this->index;
NodeID next = this->edges[this->index].next_edge;
while (next != INVALID_NODE) {
if (next == to) {
/* Will be removed, skip it. */
this->edges[prev].next_edge = edge.next_edge;
edge.next_edge = INVALID_NODE;
break;
} else {
prev = next;
next = this->edges[next].next_edge;
}
}
}
/**
* Update an edge. If mode contains UM_REFRESH refresh the edge to have at
* least the given capacity and usage, otherwise add the capacity and usage.
* In any case set the respective update timestamp(s), according to the given
* mode.
* @param from Start node of the edge.
* @param to End node of the edge.
* @param capacity Capacity to be added/updated.
* @param usage Usage to be added.
* @param mode Update mode to be applied.
*/
void LinkGraph::Edge::Update(uint capacity, uint usage, EdgeUpdateMode mode)
{
assert(this->edge.capacity > 0);
assert(capacity >= usage);
if (mode & EUM_INCREASE) {
this->edge.capacity += capacity;
this->edge.usage += usage;
} else if (mode & EUM_REFRESH) {
this->edge.capacity = max(this->edge.capacity, capacity);
this->edge.usage = max(this->edge.usage, usage);
}
if (mode & EUM_UNRESTRICTED) this->edge.last_unrestricted_update = _date;
if (mode & EUM_RESTRICTED) this->edge.last_restricted_update = _date;
}
/**
* Resize the component and fill it with empty nodes and edges. Used when
* loading from save games. The component is expected to be empty before.
* @param size New size of the component.
*/
void LinkGraph::Init(uint size)
{
assert(this->Size() == 0);
this->edges.Resize(size, size);
this->nodes.Resize(size);
for (uint i = 0; i < size; ++i) {
this->nodes[i].Init();
BaseEdge *column = this->edges[i];
for (uint j = 0; j < size; ++j) column[j].Init();
}
}
|