Java GraphPath类代码示例

import com.badlogic.gdx.ai.pfa.GraphPath; //导入依赖的package包/类
public Troop(int troops, GraphPath<Tile> path) {
    this.troops = troops;
    this.path = new DefaultGraphPath<>();

    for (Tile tile : path) {
        this.path.add(tile);
    }

    texture = Assets.TROOP;
    setSize(texture.getRegionWidth(), texture.getRegionHeight());

    label = new ConquestLabel(this.troops, getX(), getY(), getWidth(), getHeight());

    setOrigin(Align.center);
    createActions();
}
 

import com.badlogic.gdx.ai.pfa.GraphPath; //导入依赖的package包/类
@Test
public void searchNodePath_WhenDestinationUnreachable_ExpectedNoOuputPathFound () {
	// @off - disable libgdx formatter
	final String graphDrawing =
		".....#....\n" +
		".....#....\n" +
		".....#....";
	// @on - enable libgdx formatter

	final MyGraph graph = createGraphFromTextRepresentation(graphDrawing);

	final IndexedAStarPathFinder<MyNode> pathfinder = new IndexedAStarPathFinder<>(graph);

	final GraphPath<MyNode> outPath = new DefaultGraphPath<>();

	// @off - disable libgdx formatter
	// 0123456789
	// S....#...E 0
	// .....#.... 10
	// .....#.... 20
	// @on - enable libgdx formatter
	final boolean searchResult = pathfinder.searchNodePath(graph.nodes.get(0), graph.nodes.get(9), new ManhattanDistance(),
		outPath);

	Assert.assertFalse("Unexpected search result", searchResult);
}
 

import com.badlogic.gdx.ai.pfa.GraphPath; //导入依赖的package包/类
private void generatePath(GraphPath<GridNode> resultPath) {

			// @TODO replace legacy usage of GridCell.
			final LinkedList<GridNode> cells = new LinkedList<>();
			for (Object node : resultPath) {
				cells.add(new GridNode(((GridNode) node).x, ((GridNode) node).y));
			}
			ArrayList<GridNode> reversedCells = new ArrayList<>(cells);
			Collections.reverse(reversedCells);

			final Path toDestination = new Path(new SafeEntityReference(b), cells, team, false);
			final Path toSource = new Path(new SafeEntityReference(a), reversedCells, team, true);

			entityA().paths.get(team).add(toDestination);
			entityB().paths.get(team).add(toSource);
		}
 

import com.badlogic.gdx.ai.pfa.GraphPath; //导入依赖的package包/类
public TileCoordinate getNextTarget(final TileCoordinate location, final TileCoordinate destination) {
    final GraphPath<Connection<TileCoordinate>> path = new DefaultGraphPath<>();
    pathFinder.searchConnectionPath(
            graph.getCachedNode(location),
            graph.getCachedNode(destination),
            heuristic,
            path
    );

    return path.getCount() == 0 ? null : path.get(0).getToNode();
}
 

import com.badlogic.gdx.ai.pfa.GraphPath; //导入依赖的package包/类
@Override
public boolean searchConnectionPath (N startNode, N endNode, Heuristic<N> heuristic, GraphPath<Connection<N>> outPath) {

	// Perform AStar
	boolean found = search(startNode, endNode, heuristic);

	if (found) {
		// Create a path made of connections
		generateConnectionPath(startNode, outPath);
	}

	return found;
}
 

import com.badlogic.gdx.ai.pfa.GraphPath; //导入依赖的package包/类
@Override
public boolean searchNodePath (N startNode, N endNode, Heuristic<N> heuristic, GraphPath<N> outPath) {

	// Perform AStar
	boolean found = search(startNode, endNode, heuristic);

	if (found) {
		// Create a path made of nodes
		generateNodePath(startNode, outPath);
	}

	return found;
}
 

import com.badlogic.gdx.ai.pfa.GraphPath; //导入依赖的package包/类
protected void generateConnectionPath (N startNode, GraphPath<Connection<N>> outPath) {

		// Work back along the path, accumulating connections
		// outPath.clear();
		while (current.node != startNode) {
			outPath.add(current.connection);
			current = nodeRecords[graph.getIndex(current.connection.getFromNode())];
		}

		// Reverse the path
		outPath.reverse();
	}
 

import com.badlogic.gdx.ai.pfa.GraphPath; //导入依赖的package包/类
protected void generateNodePath (N startNode, GraphPath<N> outPath) {

		// Work back along the path, accumulating nodes
		// outPath.clear();
		while (current.connection != null) {
			outPath.add(current.node);
			current = nodeRecords[graph.getIndex(current.connection.getFromNode())];
		}
		outPath.add(startNode);

		// Reverse the path
		outPath.reverse();
	}
 

import com.badlogic.gdx.ai.pfa.GraphPath; //导入依赖的package包/类
public static void main(String[] args) {
	// @off - disable libgdx formatter
			final String graphDrawing =
				".....#....\n" +
				".....#....\n" +
				".....#....";
			// @on - enable libgdx formatter

			final MyGraph graph = createGraphFromTextRepresentation(graphDrawing);

			final IndexedAStarPathFinder<MyNode> pathfinder = new IndexedAStarPathFinder<MyNode>(graph);

			final GraphPath<MyNode> outPath = new DefaultGraphPath<MyNode>();

			// @off - disable libgdx formatter
			// 0123456789
			// S....#...E 0
			// .....#.... 10
			// .....#.... 20
			// @on - enable libgdx formatter
			final boolean searchResult = pathfinder.searchNodePath(graph.getNodes().get(0), graph.getNodes().get(20), new ManhattanDistance(),
				outPath);

			System.out.println(""+searchResult);
			System.out.println(""+outPath.getCount());
			for(int i=0;i<outPath.getCount();i++){
				System.out.println(""+outPath.get(i));
			}
}
 

import com.badlogic.gdx.ai.pfa.GraphPath; //导入依赖的package包/类
/** Smoothes the given path in place.
 * @param outPath the path to smooth
 * @return the number of nodes removed from the path. */
public int smoothPath (GraphPath<MyNode> outPath) {
	int inputPathLength = outPath.getCount();

	// If the path is two nodes long or less, then we can't smooth it
	if (inputPathLength <= 2) return 0;

	// Make sure the ray is instantiated
	if (this.ray == null) {
		this.ray = new MyRay(outPath.get(0), outPath.get(0));
	}

	// Keep track of where we are in the smoothed path.
	// We start at 1, because we must always include the start node in the smoothed path.
	int outputIndex = 1;

	// Keep track of where we are in the input path
	// We start at 2, because we assume two adjacent
	// nodes will pass the ray cast
	int inputIndex = 2;

	// Loop until we find the last item in the input
	while (inputIndex < inputPathLength) {
		// Set the ray
		ray.start = (outPath.get(outputIndex - 1));
		ray.end = (outPath.get(inputIndex));

		// Do the ray cast
		boolean collides = raycastCollisionDetector.collides(ray);

		if (collides) {
			// The ray test failed, swap nodes and consider the next output node
			outPath.swapNodes(outputIndex, inputIndex - 1);
			outputIndex++;
		}

		// Consider the next input node
		inputIndex++;
	}

	// Reached the last input node, always add it to the smoothed path.
	outPath.swapNodes(outputIndex, inputIndex - 1);
	outPath.truncatePath(outputIndex + 1);

	// Return the number of removed nodes
	return inputIndex - outputIndex - 1;
}
 

import com.badlogic.gdx.ai.pfa.GraphPath; //导入依赖的package包/类
public void touchToMove(int screenX, int screenY) {
        Vector3 input = new Vector3(screenX, screenY, 0);
        camera.unproject(input);
        int x = MathUtils.floor(input.x / 32);
        int y = MathUtils.floor(input.y / 32);
        Gdx.app.debug(TAG, "clicked # (x:" + x + ",y:" + y + " )");
        //we click not npc or block,set aim to move
        if (!isCollisionWithNpc(x, y) && !isCollisionWithBlock(x, y)) {
            //A* path finding
            path.clear();
            Vector2 start = new Vector2(MathUtils.round(player.getX() / 32), MathUtils.round(player.getY() / 32));
            //we need set exactly start position
            Vector2 end = new Vector2(x, y);
            int numCols = mapMgr.cols;
            int numRows = mapMgr.rows;
            Gdx.app.debug(TAG, "From:" + start + " to " + end + "|numCols:" + numCols + "|numRows:" + numRows);
            int s = (int) start.x + ((int) start.y) * numCols;
            int t = (int) end.x + ((int) (end.y)) * numCols;
            List<Sprite> temp = new ArrayList<Sprite>();
            temp.addAll(mapMgr.npcs);
            temp.addAll(mapMgr.enemies);
//            temp.addAll(mapMgr.events);
            final MyGraph graph = GraphGenerator.generateGraph(mapMgr.getBlockLayer(), temp, numCols, numRows, 32, 32, start);
            final IndexedAStarPathFinder<MyNode> pathfinder = new IndexedAStarPathFinder<MyNode>(graph);
            final GraphPath<MyNode> outPath = new DefaultGraphPath<MyNode>();
            final boolean searchResult = pathfinder.searchNodePath(graph.getNodes().get(s), graph.getNodes().get(t), new ManhattanDistance(), outPath);
            MyPathSmoother pathSmoother = new MyPathSmoother(new MyRaycastCollisionDetector(graph));
            pathSmoother.smoothPath(outPath);
            StringBuilder sb = new StringBuilder();
            for (int i = outPath.getCount() - 1; i >= 0; i--) {
                sb.append("(" + outPath.get(i).getX() + "," + outPath.get(i).getY() + ")|");
                path.add(outPath.get(i));
            }
            if (searchResult) {
                Gdx.app.debug(TAG, "Start Follow Path:" + sb.toString());
                player.followPath(path);
                aim = new Aim(x, y);
            }
        } else {
            aim = null;
        }
    }
 

import com.badlogic.gdx.ai.pfa.GraphPath; //导入依赖的package包/类
@Test
public void searchNodePath_WhenSearchingAdjacentTile_ExpectedOuputPathLengthEquals2 () {
	// @off - disable libgdx formatter
	final String graphDrawing =
			"..........\n" +
			"..........\n" +
			"..........";
	// @on - enable libgdx formatter

	final MyGraph graph = createGraphFromTextRepresentation(graphDrawing);

	final IndexedAStarPathFinder<MyNode> pathfinder = new IndexedAStarPathFinder<>(graph);

	final GraphPath<MyNode> outPath = new DefaultGraphPath<>();

	// @off - disable libgdx formatter
	// 0123456789
	// .......... 0
	// .....S.... 10
	// .....E.... 20
	// @on - enable libgdx formatter
	final boolean searchResult1 = pathfinder.searchNodePath(graph.nodes.get(15), graph.nodes.get(25), new ManhattanDistance(),
		outPath);

	Assert.assertTrue("Unexpected search result", searchResult1);
	Assert.assertEquals("Unexpected number of nodes in path", 2, outPath.getCount());

	// @off - disable libgdx formatter
	// 0123456789
	// .......... 0
	// .....SE... 10
	// .......... 20
	// @on - enable libgdx formatter
	outPath.clear();
	final boolean searchResult2 = pathfinder.searchNodePath(graph.nodes.get(15), graph.nodes.get(16), new ManhattanDistance(),
		outPath);

	Assert.assertTrue("Unexpected search result", searchResult2);
	Assert.assertEquals("Unexpected number of nodes in path", 2, outPath.getCount());

	// @off - disable libgdx formatter
	// 0123456789
	// .......... 0
	// ....ES.... 10
	// .......... 20
	// @on - enable libgdx formatter
	outPath.clear();
	final boolean searchResult3 = pathfinder.searchNodePath(graph.nodes.get(15), graph.nodes.get(14), new ManhattanDistance(),
		outPath);

	Assert.assertTrue("Unexpected search result", searchResult3);
	Assert.assertEquals("Unexpected number of nodes in path", 2, outPath.getCount());

	// @off - disable libgdx formatter
	// 0123456789
	// .....E.... 0
	// .....S.... 10
	// .......... 20
	// @on - enable libgdx formatter
	outPath.clear();
	final boolean searchResult4 = pathfinder.searchNodePath(graph.nodes.get(15), graph.nodes.get(5), new ManhattanDistance(),
		outPath);

	Assert.assertTrue("Unexpected search result", searchResult4);
	Assert.assertEquals("Unexpected number of nodes in path", 2, outPath.getCount());
}
 

import com.badlogic.gdx.ai.pfa.GraphPath; //导入依赖的package包/类
@Test
public void searchNodePath_WhenSearchCanHitDeadEnds_ExpectedOuputPathFound () {
	// @off - disable libgdx formatter
	final String graphDrawing =
		".#.#.......#..#...............\n" +
		".#............#.....#..#####..\n" +
		"...#.#######..#.....#.........\n" +
		".#.#.#........#.....########..\n" +
		".###.#....#####.....#......##.\n" +
		".#...#....#.........#...##....\n" +
		".#####....#.........#....#....\n" +
		".#........#.........#....#####\n" +
		".####....##.........#......#..\n" +
		"....#...............#......#..";
	// @on - enable libgdx formatter

	final MyGraph graph = createGraphFromTextRepresentation(graphDrawing);

	final IndexedAStarPathFinder<MyNode> pathfinder = new IndexedAStarPathFinder<>(graph);

	final GraphPath<MyNode> outPath = new DefaultGraphPath<>();

	// @off - disable libgdx formatter
	// 012345678901234567890123456789
	// S#.#.......#..#............... 0
	// .#............#.....#..#####.. 30
	// ...#.#######..#.....#......... 60
	// .#.#.#........#.....########.. 90
	// .###.#....#####.....#......##. 120
	// .#...#....#.........#...##.... 150
	// .#####....#.........#....#.... 180
	// .#E.......#.........#....##### 210
	// .####....##.........#......#.. 240
	// ....#...............#......#.. 270
	// @on - enable libgdx formatter
	final boolean searchResult = pathfinder.searchNodePath(graph.nodes.get(0), graph.nodes.get(212), new ManhattanDistance(),
		outPath);

	Assert.assertTrue("Unexpected search result", searchResult);
	Assert.assertEquals("Unexpected number of nodes in path", 32, outPath.getCount());
}