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PCGraph

Objective-C implementation of a weighted directed graph and Dijkstra’s algorithm for shortest path finding.

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Usage

Here is all the code needed to reproduce using PCGraph the example on the Dijkstra’s algorithm Wikipedia page (http://en.wikipedia.org/wiki/Dijkstra’s_algorithm))

PCGDirectedGraph *graph = [PCGDirectedGraph directedGraphWithCapacity:6];
[graph addEdgesBetweenVertex:@1 andVertex:@2 withWeight:7];
[graph addEdgesBetweenVertex:@1 andVertex:@3 withWeight:9];
[graph addEdgesBetweenVertex:@1 andVertex:@6 withWeight:14];
[graph addEdgesBetweenVertex:@2 andVertex:@3 withWeight:10];
[graph addEdgesBetweenVertex:@2 andVertex:@4 withWeight:15];
[graph addEdgesBetweenVertex:@3 andVertex:@4 withWeight:11];
[graph addEdgesBetweenVertex:@3 andVertex:@6 withWeight:2];
[graph addEdgesBetweenVertex:@5 andVertex:@4 withWeight:6];
[graph addEdgesBetweenVertex:@5 andVertex:@6 withWeight:9];

PCGPathFinder *pathFinder = [PCGPathFinderDijkstra pathFinder];
PCGPath *path = [pathFinder findPathInGraph:graph fromVertex:@1 toVertex:@5];

XCTAssertNotNil(path, @"path should not be nil");
XCTAssertNotNil(path.vertices, @"path.vertices should not be nil");
XCTAssertTrue(path.vertices.count == 4, @"path.vertices should contains a 4 steps path");
XCTAssertEqualObjects(path.vertices, (@[@1, @3, @6, @5]), @"path.vertices should contains the solution [1, 3, 6, 5]");
XCTAssertTrue(path.weight == 20, @"path.weight should be 20");

License

PCGraph is available under the MIT license. See the LICENSE file for more info.

//
//  PCGraph
//
//  Created by Pierre-David Bélanger <pierredavidbelanger@gmail.com>
//  Copyright (c) 2013 PjEr.ca. All rights reserved.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to
//  deal in the Software without restriction, including without limitation the
//  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
//  sell copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
//  DEALINGS IN THE SOFTWARE.
//

Class References

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