93 lines
2.6 KiB
C++
93 lines
2.6 KiB
C++
//
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// Walker.h
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//
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// Copyright (c) 2007-2010 Lukhnos D. Liu (http://lukhnos.org)
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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//
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#ifndef Walker_h
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#define Walker_h
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#include <algorithm>
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#include "Grid.h"
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namespace Formosa {
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namespace Gramambular {
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class Walker {
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public:
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Walker(Grid* inGrid);
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const std::vector<NodeAnchor> reverseWalk(size_t location,
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double accumulatedScore = 0.0);
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protected:
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Grid* m_grid;
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};
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inline Walker::Walker(Grid* inGrid) : m_grid(inGrid) {}
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inline const std::vector<NodeAnchor> Walker::reverseWalk(
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size_t location, double accumulatedScore) {
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if (!location || location > m_grid->width()) {
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return std::vector<NodeAnchor>();
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}
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std::vector<std::vector<NodeAnchor> > paths;
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std::vector<NodeAnchor> nodes = m_grid->nodesEndingAt(location);
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for (std::vector<NodeAnchor>::iterator ni = nodes.begin(); ni != nodes.end();
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++ni) {
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if (!(*ni).node) {
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continue;
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}
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(*ni).accumulatedScore = accumulatedScore + (*ni).node->score();
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std::vector<NodeAnchor> path =
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reverseWalk(location - (*ni).spanningLength, (*ni).accumulatedScore);
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path.insert(path.begin(), *ni);
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paths.push_back(path);
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}
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if (!paths.size()) {
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return std::vector<NodeAnchor>();
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}
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std::vector<NodeAnchor>* result = &*(paths.begin());
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for (std::vector<std::vector<NodeAnchor> >::iterator pi = paths.begin();
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pi != paths.end(); ++pi) {
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if ((*pi).back().accumulatedScore > result->back().accumulatedScore) {
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result = &*pi;
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}
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}
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return *result;
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}
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} // namespace Gramambular
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} // namespace Formosa
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#endif
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