Initial import of KREngine

--HG--
extra : convert_revision : svn%3A7752d6cf-9f14-4ad2-affc-04f1e67b81a5/trunk%404

objview/Classes/krengine/KRVector3.cpp

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+//
+//  KRVector3.cpp
+//  gldemo
+//
+//  Created by Kearwood Gilbert on 10-12-31.
+//  Copyright 2010 Kearwood Software. All rights reserved.
+//
+
+#include "KRVector3.h"
+
+//default constructor
+Vector3::Vector3(float X = 0, float Y = 0, float Z = 0)
+{
+    x = X;
+    y = Y;
+    z = Z;
+}
+
+Vector3::~Vector3()
+{
+}
+
+//calculate and return the magnitude of this vector
+float Vector3::GetMagnitude()
+{
+    return sqrtf(x * x + y * y + z * z);
+}
+
+//multiply this vector by a scalar
+Vector3 Vector3::operator*(float num) const
+{
+    return Vector3(x * num, y * num, z * num);
+}
+
+//pass in a vector, pass in a scalar, return the product
+/*
+ Vector3 Vector3::operator*(float num, Vector3 const &vec)
+{
+    return Vector3(vec.x * num, vec.y * num, vec.z * num);
+}
+ */
+
+//add two vectors
+Vector3 Vector3::operator+(const Vector3 &vec) const
+{
+    return Vector3(x + vec.x, y + vec.y, z + vec.z);
+}
+
+//subtract two vectors
+Vector3 Vector3::operator-(const Vector3 &vec) const
+{
+    return Vector3(x - vec.x, y - vec.y, z - vec.z);
+}
+
+//normalize this vector
+void Vector3::normalize()
+{
+    float magnitude = sqrtf(x * x + y * y + z * z);
+    x /= magnitude;
+    y /= magnitude;
+    z /= magnitude;
+}
+
+//calculate and return dot product
+float Vector3::dot(const Vector3 &vec) const
+{
+    return x * vec.x + y * vec.y + z * vec.z;
+}
+
+//calculate and return cross product
+Vector3 Vector3::cross(const Vector3 &vec) const
+{
+    return Vector3(y * vec.z - z * vec.y,
+                   z * vec.x - x * vec.z,
+                   x * vec.y - y * vec.x);
+}