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