Mercurial > fife-parpg

annotate engine/core/model/metamodel/abstractpather.h @ 378:64738befdf3b

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bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
author vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
date Mon, 11 Jan 2010 23:34:52 +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 * *
46
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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. *
0
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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