From b7c2d6f420e7e8a95b012d52ef0b2a88e58957cd Mon Sep 17 00:00:00 2001
From: Michael Bayne <mdb@samskivert.com>
Date: Mon, 30 Apr 2012 15:14:26 -0700
Subject: [PATCH] Added Vector.subtract that takes individual components.

Closes #11.
---
 src/main/java/pythagoras/f/AbstractVector.java | 10 ++++++++++
 src/main/java/pythagoras/f/IVector.java        |  8 ++++++++
 2 files changed, 18 insertions(+)

diff --git a/src/main/java/pythagoras/f/AbstractVector.java b/src/main/java/pythagoras/f/AbstractVector.java
index 7b7b76e..cc14c73 100644
--- a/src/main/java/pythagoras/f/AbstractVector.java
+++ b/src/main/java/pythagoras/f/AbstractVector.java
@@ -136,6 +136,16 @@ public abstract class AbstractVector implements IVector
         return result.set(x() + x, y() + y);
     }
 
+    @Override // from interface IVector
+    public Vector subtract (float x, float y) {
+        return subtract(x, y, new Vector());
+    }
+
+    @Override // from interface IVector
+    public Vector subtract (float x, float y, Vector result) {
+        return result.set(x() - x, y() - y);
+    }
+
     @Override // from interface IVector
     public Vector addScaled (IVector other, float v) {
         return addScaled(other, v, new Vector());
diff --git a/src/main/java/pythagoras/f/IVector.java b/src/main/java/pythagoras/f/IVector.java
index a7147b8..5f36dc9 100644
--- a/src/main/java/pythagoras/f/IVector.java
+++ b/src/main/java/pythagoras/f/IVector.java
@@ -115,6 +115,14 @@ public interface IVector
      * @return a reference to the result, for chaining. */
     Vector subtract (IVector other, Vector result);
 
+    /** Subtracts a vector from this one.
+     * @return a new vector containing the result. */
+    Vector subtract (float x, float y);
+
+    /** Subtracts a vector from this one and places the result in the supplied object.
+     * @return a reference to the result, for chaining. */
+    Vector subtract (float x, float y, Vector result);
+
     /** Rotates this vector by the specified angle.
      * @return a new vector containing the result. */
     Vector rotate (float angle);