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annotate engine/core/model/metamodel/abstractpather.h @ 526:c916d7b7de1c

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Added the goldstack image as I forgot to add it before.
author prock@33b003aa-7bff-0310-803a-e67f0ece8222
date Fri, 28 May 2010 04:15:56 +0000
parents 90005975cdbb
children
rev   line source
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1 /***************************************************************************
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2 * Copyright (C) 2005-2008 by the FIFE team *
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3 * http://www.fifengine.de *
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4 * This file is part of FIFE. *
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5 * *
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6 * FIFE is free software; you can redistribute it and/or *
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7 * modify it under the terms of the GNU Lesser General Public *
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8 * License as published by the Free Software Foundation; either *
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9 * version 2.1 of the License, or (at your option) any later version. *
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10 * *
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11 * This library is distributed in the hope that it will be useful, *
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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14 * Lesser General Public License for more details. *
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15 * *
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16 * You should have received a copy of the GNU Lesser General Public *
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17 * License along with this library; if not, write to the *
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18 * Free Software Foundation, Inc., *
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19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
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20 ***************************************************************************/
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21
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22 #ifndef FIFE_MODEL_ABSTRACTPATHER_H
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23 #define FIFE_MODEL_ABSTRACTPATHER_H
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24
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25 // Standard C++ library includes
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26 #include <string>
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27
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28 // 3rd party library includes
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29
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30 // FIFE includes
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31 // These includes are split up in two parts, separated by one empty line
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32 // First block: files included from the FIFE root src directory
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33 // Second block: files included from the same folder
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34
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35 namespace FIFE {
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36 class Map;
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37 class Location;
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38 class Instance;
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39
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40 enum
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41 {
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42 HIGH_PRIORITY,
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43 MEDIUM_PRIORITY,
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44 LOW_PRIORITY
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45 };
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46
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47 class AbstractPather {
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48 public:
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49 virtual ~AbstractPather() {};
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50
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51 /** Gets next location from pathfinder
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52 * Model will call this function periodically when instances should
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53 * move on map. Pather must return next location where instance should be moved.
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54 * Pather must be able to store multiple sessions for multiple simultaneous searches
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55 * (coming from multiple instances)
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56 *
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57 * @param instance Instance making the call
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58 * @param target Target of the movement. This must be always on same layer as curpos
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59 * @param distance_to_travel Distance how far caller can travel (in layer units)
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60 * @param nextLocation next location returned by the pather
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61 * @param facingLocation next facing location returned by the pather
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62 * @param session_id pather can do pathfinding in increments.
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63 * Further increments are bind to previous ones with given session_id
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64 * @param priority The priority to assign to search (high are pushed to the front of the queue).
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65 * @return session_id to use with further calls
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66 */
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67 virtual int getNextLocation(const Instance* instance, const Location& target,
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68 double distance_to_travel, Location& nextLocation,
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69 Location& facingLocation, int session_id=-1,
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70 int priority = MEDIUM_PRIORITY) = 0;
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71
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72 /** Updates the pather (should it need updating).
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73 *
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74 * The update method is called by the model. Pathfinders which require per loop updating
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75 * (in the case of pathfinders which implement A* for instance) should use this method
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76 * as an oppurtunity to update the search. Generally the method should be constrained to
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77 * a maximum amount of search updating to prevent this method from stalling the application.
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78 */
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79 virtual void update() = 0;
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80
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81 /** Cancels a given session.
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82 *
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83 * This function is called when (for instance) the user changes their mind about
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84 * a destination while the agent is already moving, the old session needs to be
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85 * cancelled and a new one created.
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86 *
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87 * @param session_id The id of the session to cancel.
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88 * @return A boolean to signify whether the session was successfully found and cancelled.
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89 */
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90 virtual bool cancelSession(const int session_id) = 0;
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91
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92 /** Gets the name of this pather
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93 */
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94 virtual std::string getName() const = 0;
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95 };
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96 }
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97
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98 #endif