X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fvector.cpp;h=e992bbffd53aa5496bffde85c0ff6b543f4891fd;hb=8ab4e08bd78cb5b07f069e3e6c5bf76944cb14fa;hp=e9ad51f3427fa06ad918dd7793986369cacdef87;hpb=fa8da664bfb749497b1b2d2991077af0554cc369;p=architektonas

diff --git a/src/vector.cpp b/src/vector.cpp
index e9ad51f..e992bbf 100644
--- a/src/vector.cpp
+++ b/src/vector.cpp
@@ -1,7 +1,7 @@
 //
 // vector.cpp: Various structures used for 3 dimensional imaging
 //
-// by James L. Hammons
+// by James Hammons
 // (C) 2006 Underground Software
 //
 // JLH = James L. Hammons <jlhamm@acm.org>
@@ -133,6 +133,35 @@ Vector& Vector::operator+=(double const v)
 	return *this;
 }
 
+// Vector - vector, self assigned
+
+Vector& Vector::operator-=(Vector const v)
+{
+	x -= v.x, y -= v.y, z -= v.z;
+
+	return *this;
+}
+
+// Vector - constant, self assigned
+
+Vector& Vector::operator-=(double const v)
+{
+	x -= v, y -= v, z -= v;
+
+	return *this;
+}
+
+// Check for equality
+bool Vector::operator==(Vector const v)
+{
+	return (x == v.x && y == v.y && z == v.z ? true : false);
+}
+
+// Check for inequality
+bool Vector::operator!=(Vector const v)
+{
+	return (x != v.x || y != v.y || z != v.z ? true : false);
+}
 
 Vector Vector::Unit(void)
 {