Added Walkable analyzer code

README

@@ -1,5 +1,5 @@
 An A* (Astar) library for Scala/Java
 
-This is a direct port of the AS3 code created by Jeroen Beckers at http://www.dauntless.be/astar/
+This is a port of the AS3 code created by Jeroen Beckers at http://www.dauntless.be/astar/
 
 This was developed while working at Kixeye http://www.kixeye.com

src/com/adverserealms/astar/basic2d/WalkableTile.scala

@@ -0,0 +1,31 @@
+/*
+Copyright (c) 2012 Joshua Garnett
+
+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.
+*/
+
+package com.adverserealms.astar.basic2d
+
+trait WalkableTile {
+
+  /**
+   * Returns if the tile is walkable or not
+   */
+  def getWalkable() : Boolean
+}

src/com/adverserealms/astar/basic2d/analyzers/WalkableAnalyzer.scala

@@ -0,0 +1,58 @@
+/*
+Copyright (c) 2012 Joshua Garnett
+
+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.
+*/
+
+package com.adverserealms.astar.basic2d.analyzers
+
+import scala.collection.mutable.ListBuffer
+
+import com.adverserealms.astar.basic2d.WalkableTile
+import com.adverserealms.astar.core.Analyzer
+import com.adverserealms.astar.core.AstarTile
+import com.adverserealms.astar.core.PathRequest
+
+/**
+ * The WalkableAnalyzer eliminates tiles that aren't walkable. If ignoreEnd is 
+ * true, the end node (PathRequest.isTarget(tile)) doesn't have to be walkable
+ */
+class WalkableAnalyzer(ignoreEnd:Boolean) extends Analyzer {
+
+  def analyzeTile(mainTile:AstarTile, request:PathRequest) : Boolean = {
+    if(ignoreEnd && request.isTarget(mainTile)) {
+      true
+    }
+    else {
+      mainTile.asInstanceOf[WalkableTile].getWalkable
+    }
+  }
+
+  def analyze(mainTile:AstarTile, neighbors:List[AstarTile], request:PathRequest) : List[AstarTile] = {
+    val walkableNeighbors = new ListBuffer[AstarTile]
+
+    for(tile <- neighbors) {
+      if(tile.asInstanceOf[WalkableTile].getWalkable || ignoreEnd && request.isTarget(mainTile)) {
+        walkableNeighbors += tile
+      }
+    }
+
+    walkableNeighbors.toList
+  }
+}

src/com/adverserealms/astar/core/Analyzer.scala

@@ -42,10 +42,10 @@ trait Analyzer {
    * Eliminates neighbors from the given array and returns the neighbors that were valid.
    * 
    * @param mainTile The tile who's neighbors are being analyzed
-   * @param neighbours A list consisting of all the neighbors of the mainTile
+   * @param neighbors A list consisting of all the neighbors of the mainTile
    * @param request The PathRequest that is currently being executed
    * 
    * @return A list consisting of all the neighbors that passed this analyzer
    */
-  def analyze(mainTile:AstarTile, allNeighbors:List[AstarTile], request:PathRequest) : List[AstarTile]
+  def analyze(mainTile:AstarTile, neighbors:List[AstarTile], request:PathRequest) : List[AstarTile]
 }