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| // Copyright 2010-2024 Google LLC | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| // Unit test utilities related to graph.h. | ||
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| #ifndef UTIL_GRAPH_TEST_UTIL_H_ | ||
| #define UTIL_GRAPH_TEST_UTIL_H_ | ||
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| #include <cstdint> | ||
| #include <memory> | ||
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| #include "absl/memory/memory.h" | ||
| #include "ortools/base/types.h" | ||
| #include "ortools/graph/graph.h" | ||
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| namespace util { | ||
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| // Generate a 2-dimensional undirected grid graph. | ||
| // | ||
| // Eg. for width=3, height=2, it generates this: | ||
| // 0 <---> 1 <---> 2 | ||
| // ^ ^ ^ | ||
| // | | | | ||
| // v v v | ||
| // 3 <---> 4 <---> 5 | ||
| template <class Graph> | ||
| std::unique_ptr<Graph> Create2DGridGraph(int64_t width, int64_t height) { | ||
| const int64_t num_arcs = 2L * ((width - 1) * height + width * (height - 1)); | ||
| auto graph = std::make_unique<Graph>(/*num_nodes=*/width * height, | ||
| /*arc_capacity=*/num_arcs); | ||
| // Add horizontal edges. | ||
| for (int i = 0; i < height; ++i) { | ||
| for (int j = 1; j < width; ++j) { | ||
| const int left = i * width + (j - 1); | ||
| const int right = i * width + j; | ||
| graph->AddArc(left, right); | ||
| graph->AddArc(right, left); | ||
| } | ||
| } | ||
| // Add vertical edges. | ||
| for (int i = 1; i < height; ++i) { | ||
| for (int j = 0; j < width; ++j) { | ||
| const int up = (i - 1) * width + j; | ||
| const int down = i * width + j; | ||
| graph->AddArc(up, down); | ||
| graph->AddArc(down, up); | ||
| } | ||
| } | ||
| graph->Build(); | ||
| return graph; | ||
| } | ||
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| } // namespace util | ||
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| #endif // UTIL_GRAPH_TEST_UTIL_H_ |