flowmapper.cpp

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/*
 * 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 <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
 */

 
#include "../stdafx.h"
#include "flowmapper.h"
 
#include "../safeguards.h"

void FlowMapper::Run(LinkGraphJob &job) const
{
  for (NodeID node_id = 0; node_id < job.Size(); ++node_id) {
    Node &prev_node = job[node_id];
    StationID prev = prev_node.base.station;
    for (const Path *path : prev_node.paths) {
      uint flow = path->GetFlow();
      if (flow == 0) break;
      Node &node = job[path->GetNode()];
      StationID via = node.base.station;
      StationID origin = job[path->GetOrigin()].base.station;
      assert(prev != via && via != origin);
      /* Mark all of the flow for local consumption at "first". */
      node.flows.AddFlow(origin, via, flow);
      if (prev != origin) {
        /* Pass some of the flow marked for local consumption at "prev" on
         * to this node. */
        prev_node.flows.PassOnFlow(origin, via, flow);
      } else {
        /* Prev node is origin. Simply add flow. */
        prev_node.flows.AddFlow(origin, via, flow);
      }
    }
  }
 
  for (NodeID node_id = 0; node_id < job.Size(); ++node_id) {
    /* Remove local consumption shares marked as invalid. */
    Node &node = job[node_id];
    FlowStatMap &flows = node.flows;
    flows.FinalizeLocalConsumption(node.base.station);
    if (this->scale) {
      /* Scale by time the graph has been running without being compressed. Add 1 to avoid
       * division by 0 if spawn date == last compression date. This matches
       * LinkGraph::Monthly(). */
      auto runtime = job.JoinDate() - job.Settings().recalc_time / CalendarTime::SECONDS_PER_DAY - job.LastCompression() + 1;
      for (auto &it : flows) {
        it.second.ScaleToMonthly(runtime.base());
      }
    }
    /* Clear paths. */
    for (Path *i : node.paths) delete i;
    node.paths.clear();
  }
}