From c6c11ca95a7fc70d7de0bffe3e860e9f09976487 Mon Sep 17 00:00:00 2001
From: Eryn Wells <eryn@erynwells.me>
Date: Wed, 11 Sep 2013 08:56:53 -0700
Subject: [PATCH] Add operator*= to colors

---
 src/basics.cc | 13 ++++++++++++-
 src/basics.h  |  3 ++-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/basics.cc b/src/basics.cc
index f7ad01e..31884a5 100644
--- a/src/basics.cc
+++ b/src/basics.cc
@@ -198,7 +198,8 @@ Ray::Ray(Vector3 o, Vector3 d)
  * Compute and return the point given by parameterizing this Ray by time t.
  */
 Vector3
-Ray::parameterize(float t)
+Ray::parameterize(const float t)
+    const
 {
     return origin + t * direction;
 }
@@ -241,3 +242,13 @@ Color::operator=(const Color &c)
     alpha = c.alpha;
     return *this;
 }
+
+
+Color &
+Color::operator*=(const float f)
+{
+    red *= f;
+    green *= f;
+    blue *= f;
+    return *this;
+}
diff --git a/src/basics.h b/src/basics.h
index aca6795..a69fe6b 100644
--- a/src/basics.h
+++ b/src/basics.h
@@ -42,7 +42,7 @@ struct Ray
     Ray();
     Ray(Vector3 o, Vector3 d);
 
-    Vector3 parameterize(float t);
+    Vector3 parameterize(const float t) const;
 
     Vector3 origin, direction;
 };
@@ -54,6 +54,7 @@ struct Color
     Color(float r, float g, float b, float a);
 
     Color &operator=(const Color &c);
+    Color &operator*=(const float c);
 
     static const Color Black;
     static const Color White;