From 211d6a6042d139ab5f3c770aa5ac695a062232c8 Mon Sep 17 00:00:00 2001
From: Pacien TRAN-GIRARD
Date: Sat, 21 Nov 2015 15:37:55 +0100
Subject: Implement World non-abstract behaviours

---
 src/ch/epfl/maze/physical/World.java | 75 ++++++++++++++++++++++++++++--------
 src/ch/epfl/maze/util/Direction.java | 13 +++++++
 2 files changed, 72 insertions(+), 16 deletions(-)

(limited to 'src/ch/epfl/maze')

diff --git a/src/ch/epfl/maze/physical/World.java b/src/ch/epfl/maze/physical/World.java
index d6ac1de..7e89fb5 100644
--- a/src/ch/epfl/maze/physical/World.java
+++ b/src/ch/epfl/maze/physical/World.java
@@ -3,11 +3,14 @@ package ch.epfl.maze.physical;
 import ch.epfl.maze.util.Direction;
 import ch.epfl.maze.util.Vector2D;
 
+import java.util.ArrayList;
 import java.util.List;
 
 /**
  * World that is represented by a labyrinth of tiles in which an {@code Animal}
  * can move.
+ *
+ * @author Pacien TRAN-GIRARD
  */
 
 public abstract class World {
@@ -19,6 +22,15 @@ public abstract class World {
     public static final int EXIT = 3;
     public static final int NOTHING = -1;
 
+    /**
+     * Structure of the labyrinth, an NxM array of tiles
+     */
+
+    private final int[][] labyrinth;
+
+    private final Vector2D start;
+    private final Vector2D exit;
+
     /**
      * Constructs a new world with a labyrinth. The labyrinth must be rectangle.
      *
@@ -26,7 +38,26 @@ public abstract class World {
      */
 
     public World(int[][] labyrinth) {
-        // TODO
+        this.labyrinth = labyrinth;
+
+        this.start = this.findFirstTileOfType(World.START);
+        this.exit = this.findFirstTileOfType(World.EXIT);
+    }
+
+    /**
+     * Finds the coordinates of the first occurrence of the given tile type.
+     *
+     * @param tileType Type of the tile
+     * @return A Vector2D of the first occurrence of the given tile type
+     */
+
+    private Vector2D findFirstTileOfType(int tileType) {
+        for (int x = 0; x < this.getWidth(); ++x)
+            for (int y = 0; y < this.getHeight(); ++y)
+                if (this.getTile(x, y) == tileType)
+                    return new Vector2D(x, y);
+
+        return null;
     }
 
     /**
@@ -56,13 +87,14 @@ public abstract class World {
      *
      * @param x Horizontal coordinate
      * @param y Vertical coordinate
-     * @return The tile number at position (x, y), or the NONE tile if x or y is
+     * @return The tile number at position (x, y), or the NOTHING tile if x or y is
      * incorrect.
      */
 
     public final int getTile(int x, int y) {
-        // TODO
-        return 0;
+        if (x < 0 || x >= this.getWidth()) return World.NOTHING;
+        if (y < 0 || y >= this.getHeight()) return World.NOTHING;
+        return this.labyrinth[y][x];
     }
 
     /**
@@ -74,8 +106,19 @@ public abstract class World {
      */
 
     public final boolean isFree(int x, int y) {
-        // TODO
-        return false;
+        int tile = this.getTile(x, y);
+        return !(tile == World.WALL || tile == World.NOTHING);
+    }
+
+    /**
+     * Determines if coordinates are free to walk on.
+     *
+     * @param position The position vector
+     * @return <b>true</b> if an animal can walk on tile, <b>false</b> otherwise
+     */
+
+    public final boolean isFree(Vector2D position) {
+        return this.isFree(position.getX(), position.getY());
     }
 
     /**
@@ -88,8 +131,12 @@ public abstract class World {
      */
 
     public final Direction[] getChoices(Vector2D position) {
-        // TODO
-        return null;
+        ArrayList<Direction> choices = new ArrayList<>();
+        for (Direction dir : Direction.POSSIBLE_DIRECTIONS)
+            if (this.isFree(position.addDirectionTo(dir)))
+                choices.add(dir);
+
+        return choices.isEmpty() ? new Direction[]{Direction.NONE} : choices.toArray(new Direction[choices.size()]);
     }
 
     /**
@@ -99,8 +146,7 @@ public abstract class World {
      */
 
     public final int getWidth() {
-        // TODO
-        return 0;
+        return this.labyrinth[0].length;
     }
 
     /**
@@ -110,8 +156,7 @@ public abstract class World {
      */
 
     public final int getHeight() {
-        // TODO
-        return 0;
+        return this.labyrinth.length;
     }
 
     /**
@@ -122,8 +167,7 @@ public abstract class World {
      */
 
     public final Vector2D getStart() {
-        // TODO
-        return null;
+        return this.start;
     }
 
     /**
@@ -133,7 +177,6 @@ public abstract class World {
      */
 
     public final Vector2D getExit() {
-        // TODO
-        return null;
+        return this.exit;
     }
 }
diff --git a/src/ch/epfl/maze/util/Direction.java b/src/ch/epfl/maze/util/Direction.java
index e8c0993..5f83c22 100644
--- a/src/ch/epfl/maze/util/Direction.java
+++ b/src/ch/epfl/maze/util/Direction.java
@@ -4,11 +4,24 @@ package ch.epfl.maze.util;
  * Directions that an animal can take to move. They represent the four cardinal
  * points ({@code DOWN, UP, RIGHT, LEFT}) from the frame of reference of the
  * labyrinth, plus a default one : {@code NONE}.
+ *
+ * @author Pacien TRAN-GIRARD
  */
 
 public enum Direction {
     DOWN, UP, RIGHT, LEFT, NONE;
 
+    /**
+     * An array of all the possible directions that can be taken.
+     */
+
+    public static final Direction[] POSSIBLE_DIRECTIONS = new Direction[]{
+            Direction.DOWN,
+            Direction.UP,
+            Direction.RIGHT,
+            Direction.LEFT
+    };
+
     /**
      * Returns the integer value of the direction
      *
-- 
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