70 lines
2.6 KiB
C++
70 lines
2.6 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef NUVIE_PATHFINDER_SEEK_PATH_H
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#define NUVIE_PATHFINDER_SEEK_PATH_H
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#include "ultima/shared/std/containers.h"
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#include "ultima/nuvie/pathfinder/path.h"
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namespace Ultima {
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namespace Nuvie {
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/* Provides routines for building short paths around obstacles and seeking a
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* target. Much of the work doesn't involve finding a path at all, but instead
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* finding the direction closest to the target.
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*/
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class SeekPath: public Path {
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protected:
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Std::vector<MapCoord> A_scan, B_scan; // nodes of a line scanned by trace_obstacle()
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void create_path(const MapCoord &start, const MapCoord &goal);
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Std::vector<MapCoord> *get_best_scan(const MapCoord &start, const MapCoord &goal);
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void delete_nodes();
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bool trace_check_obstacle(bool &turned, MapCoord &line, sint32 &deltax, sint32 &deltay, sint32 &xdir, sint32 &ydir, Std::vector<MapCoord> *scan);
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void trace_around_corner(MapCoord &line, sint32 &deltax, sint32 &deltay, sint32 &xdir, sint32 &ydir, Std::vector<MapCoord> *scan);
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public:
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SeekPath();
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~SeekPath() override;
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sint32 step_cost(const MapCoord &c1, const MapCoord &c2) override {
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return -1;
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}
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bool path_search(const MapCoord &start, const MapCoord &goal) override;
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void delete_path() {
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Path::delete_path();
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delete_nodes();
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}
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/* Trace obstacle towards xdir,ydir for a possible opening. */
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bool trace_obstacle(MapCoord line, sint32 deltax, sint32 deltay, sint32 xdir, sint32 ydir, Std::vector<MapCoord> *scan);
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/* Get two relative directions that a line can travel to trace around an
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obstacle towards `xdir',`ydir'. */
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bool get_obstacle_tracer(const MapCoord &start, sint32 xdir, sint32 ydir,
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sint32 &Axdir, sint32 &Aydir,
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sint32 &Bxdir, sint32 &Bydir);
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};
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} // End of namespace Nuvie
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} // End of namespace Ultima
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#endif
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