# flowmapper.cpp

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    00001 /* $Id$ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * 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.
    00006  * 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.
    00007  * 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/>.
    00008  */
    00009
    00012 #include "../stdafx.h"
    00013 #include "flowmapper.h"
    00014
    00019 void FlowMapper::Run(LinkGraphJob &job) const
    00020 {
    00021   /* Time the graph has been running without being compressed. */
    00022   uint runtime = job.JoinDate() - job.Settings().recalc_time - job.LastCompression();
    00023
    00024   for (NodeID node_id = 0; node_id < job.Size(); ++node_id) {
    00025     Node prev_node = job[node_id];
    00026     StationID prev = prev_node.Station();
    00027     PathSet &paths = prev_node.Paths();
    00028     for (PathSet::iterator i = paths.begin(); i != paths.end(); ++i) {
    00029       Path *path = *i;
    00030       uint flow = path->GetFlow();
    00031       if (flow == 0) continue;
    00032       /* compress to monthly value */
    00033       flow = max(1U, flow * 30 / runtime);
    00034       Node node = job[path->GetNode()];
    00035       StationID via = node.Station();
    00036       StationID origin = job[path->GetOrigin()].Station();
    00037       assert(prev != via && via != origin);
    00038       /* Mark all of the flow for local consumption at "first". */
    00039       node.Flows().AddFlow(origin, via, flow);
    00040       if (prev != origin) {
    00041         /* Pass some of the flow marked for local consumption at "prev" on
    00042          * to this node. */
    00043         prev_node.Flows().PassOnFlow(origin, via, flow);
    00044       } else {
    00045         /* Prev node is origin. Simply add flow. */
    00046         prev_node.Flows().AddFlow(origin, via, flow);
    00047       }
    00048     }
    00049   }
    00050
    00051   for (NodeID node_id = 0; node_id < job.Size(); ++node_id) {
    00052     /* Remove local consumption shares marked as invalid. */
    00053     Node node = job[node_id];
    00054     node.Flows().FinalizeLocalConsumption(node.Station());
    00055     /* Clear paths. */
    00056     PathSet &paths = node.Paths();
    00057     for (PathSet::iterator i = paths.begin(); i != paths.end(); ++i) {
    00058       delete *i;
    00059     }
    00060     paths.clear();
    00061   }
    00062 }