From 82e1cfa8d402299ae950019631465d2e4b2238e2 Mon Sep 17 00:00:00 2001
From: Leen Dereu <leen.dereu@student.kuleuven.be>
Date: Tue, 27 Feb 2018 12:26:43 +0100
Subject: [PATCH] added turn

---
 src/Worm.java | 35 ++++++++++++++++++++++++++---------
 1 file changed, 26 insertions(+), 9 deletions(-)

diff --git a/src/Worm.java b/src/Worm.java
index a975a1b..f35a646 100644
--- a/src/Worm.java
+++ b/src/Worm.java
@@ -149,25 +149,42 @@ public class Worm {
     }
     
     /**
-     * 
      * @param NumberSteps
      * 
-     * @post ...
+     * @post the new x-coordinate schould be the old one plus the number of steps multiplied 
+     * 		 with the distance of a step in the x-orientation
      * 		|new.CoordX = CoordX + NumberSteps * distanceX
-     * 
-     * @post 
+     * @post the new y-coordinate schould be the old one plus the number of steps multiplied
+     * 		 with the distance of a step in the y-orientation
      * 		|new.CoordY = CoordY + NumberSteps * distanceY
      * 
      * @throws IllegalArgumentException
-     * 		when the total of steps is lower then zero  
+     * 		when the total of steps is lower then 0  
      * 		|NumberSteps < 0
      */
-    public void move(int NumberSteps) {
-    	if (NumberSteps < 0)
+    public void move(int numberSteps) {
+    	if (numberSteps < 0)
     		throw new IllegalArgumentException();
     	double distanceX = getRadius() * Math.cos(getOrientation());
     	double distanceY = getRadius() * Math.sin(getOrientation());
-    	setCoordX(getCoordX() + NumberSteps * distanceX);
-    	setCoordY(getCoordY() + NumberSteps * distanceY);
+    	setCoordX(getCoordX() + numberSteps * distanceX);
+    	setCoordY(getCoordY() + numberSteps * distanceY);
+    }
+    
+    /**
+     * @param angleToAdd
+     * 		  the angle that must be added to the orientation
+     * 
+     * @pre the angle to add must be between 0 and 2pi (including 0)
+     * 		|0 <= angleToAdd < 2pi
+     * 
+     * @post the new orientation is the old orientation plus the given angle
+     * 		|new.orientation = orientation + angleToAdd
+     * @post the resulting angle (= the new orientation) must be between 0 and 2pi (including 0)
+     * 		|0 <= new.orientation < 2pi
+     */
+    public void turn(double angleToAdd) {
+    	assert 0 <= angleToAdd && angleToAdd < 2 * Math.PI;
+    	
     }
 }