From c5e5646b7785e1b5d1c46efd5e93a6f95d5bad9f Mon Sep 17 00:00:00 2001
From: Pacien TRAN-GIRARD
Date: Wed, 25 Nov 2015 00:07:56 +0100
Subject: Implement PacMan predator avoidance

---
 src/ch/epfl/maze/physical/pacman/Ghost.java        | 18 ++----------
 src/ch/epfl/maze/physical/pacman/PacMan.java       | 19 +++++++++++--
 .../stragegies/planner/DistanceCalculator.java     | 33 ++++++++++++++++++++++
 3 files changed, 51 insertions(+), 19 deletions(-)
 create mode 100644 src/ch/epfl/maze/physical/stragegies/planner/DistanceCalculator.java

diff --git a/src/ch/epfl/maze/physical/pacman/Ghost.java b/src/ch/epfl/maze/physical/pacman/Ghost.java
index f8f511e..77d0e25 100644
--- a/src/ch/epfl/maze/physical/pacman/Ghost.java
+++ b/src/ch/epfl/maze/physical/pacman/Ghost.java
@@ -4,6 +4,7 @@ import ch.epfl.maze.physical.Daedalus;
 import ch.epfl.maze.physical.Predator;
 import ch.epfl.maze.physical.Prey;
 import ch.epfl.maze.physical.stragegies.picker.RandomPicker;
+import ch.epfl.maze.physical.stragegies.planner.DistanceCalculator;
 import ch.epfl.maze.physical.stragegies.reducer.BackwardReducer;
 import ch.epfl.maze.physical.stragegies.reducer.CostReducer;
 import ch.epfl.maze.util.Direction;
@@ -17,7 +18,7 @@ import java.util.Set;
  *
  * @author Pacien TRAN-GIRARD
  */
-abstract public class Ghost extends Predator implements BackwardReducer, CostReducer, RandomPicker {
+abstract public class Ghost extends Predator implements DistanceCalculator, BackwardReducer, CostReducer, RandomPicker {
 
     public enum Mode {
         CHASE(40),
@@ -207,21 +208,6 @@ abstract public class Ghost extends Predator implements BackwardReducer, CostRed
         return prey.getDirection();
     }
 
-    /**
-     * Calculates the Euclidean distance from the adjacent position at the given Direction to the target position.
-     *
-     * @param dir            The adjacent Direction
-     * @param targetPosition The targeted position
-     * @return The Euclidean distance between the two positions
-     */
-    private double getDistanceTo(Direction dir, Vector2D targetPosition) {
-        return this
-                .getPosition()
-                .addDirectionTo(dir)
-                .sub(targetPosition)
-                .dist();
-    }
-
     /**
      * Rotates to the next Mode.
      */
diff --git a/src/ch/epfl/maze/physical/pacman/PacMan.java b/src/ch/epfl/maze/physical/pacman/PacMan.java
index e2a55e9..5458dd5 100644
--- a/src/ch/epfl/maze/physical/pacman/PacMan.java
+++ b/src/ch/epfl/maze/physical/pacman/PacMan.java
@@ -4,7 +4,8 @@ import ch.epfl.maze.physical.Animal;
 import ch.epfl.maze.physical.Daedalus;
 import ch.epfl.maze.physical.Prey;
 import ch.epfl.maze.physical.stragegies.picker.RandomPicker;
-import ch.epfl.maze.physical.stragegies.reducer.BackwardReducer;
+import ch.epfl.maze.physical.stragegies.planner.DistanceCalculator;
+import ch.epfl.maze.physical.stragegies.reducer.CostReducer;
 import ch.epfl.maze.util.Direction;
 import ch.epfl.maze.util.Vector2D;
 
@@ -16,7 +17,7 @@ import java.util.Set;
  * @author EPFL
  * @author Pacien TRAN-GIRARD
  */
-public class PacMan extends Prey implements BackwardReducer, RandomPicker {
+public class PacMan extends Prey implements DistanceCalculator, CostReducer, RandomPicker {
 
     /**
      * Constructs a new Pac-Man.
@@ -27,9 +28,21 @@ public class PacMan extends Prey implements BackwardReducer, RandomPicker {
         super(position);
     }
 
+    @Override
+    public int getChoiceCost(Direction choice, Daedalus daedalus) {
+        return (-1) * daedalus
+                .getPredatorSet()
+                .stream()
+                .map(pred -> this.getDistanceTo(choice, pred.getPosition()))
+                .map(dist -> dist * 100.0d)
+                .min(Double::compare)
+                .get()
+                .intValue();
+    }
+
     @Override
     public Direction move(Set<Direction> choices, Daedalus daedalus) {
-        Set<Direction> smartChoices = choices.size() > 1 ? this.reduce(choices) : choices;
+        Set<Direction> smartChoices = this.reduce(choices, daedalus);
         return this.pick(smartChoices);
     }
 
diff --git a/src/ch/epfl/maze/physical/stragegies/planner/DistanceCalculator.java b/src/ch/epfl/maze/physical/stragegies/planner/DistanceCalculator.java
new file mode 100644
index 0000000..daeb581
--- /dev/null
+++ b/src/ch/epfl/maze/physical/stragegies/planner/DistanceCalculator.java
@@ -0,0 +1,33 @@
+package ch.epfl.maze.physical.stragegies.planner;
+
+import ch.epfl.maze.util.Direction;
+import ch.epfl.maze.util.Vector2D;
+
+/**
+ * @author Pacien TRAN-GIRARD
+ */
+public interface DistanceCalculator {
+
+    /**
+     * Returns the current position.
+     *
+     * @return The current position vector
+     */
+    Vector2D getPosition();
+
+    /**
+     * Calculates the Euclidean distance from the adjacent position at the given Direction to the target position.
+     *
+     * @param dir            The adjacent Direction
+     * @param targetPosition The targeted position
+     * @return The Euclidean distance between the two positions
+     */
+    default double getDistanceTo(Direction dir, Vector2D targetPosition) {
+        return this
+                .getPosition()
+                .addDirectionTo(dir)
+                .sub(targetPosition)
+                .dist();
+    }
+
+}
-- 
cgit v1.2.3