CSE167/Vector3.cpp at master · JFHwang/CSE167 · GitHub

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#include "Vector3.h"
#include <math.h>
#include <iostream>
#include <cstring>
#include "Vector4.h"
#define PI 3.1415926535

Vector3::Vector3()
{
    std::memset(m, 0, sizeof(m));
}

Vector3::Vector3(float m0, float m1, float m2)
{
    m[0] = m0;
    m[1] = m1;
    m[2] = m2;

	//this->set(m0, m1, m2);
}

Vector3::~Vector3()
{
    //

}

float* Vector3::ptr()
{
    return &m[0];
}

void Vector3::set(float x, float y, float z)
{
    m[0] = x;
    m[1] = y;
    m[2] = z;
}

void Vector3::set(int index, float value)
{
    m[index] = value;
}

float& Vector3::operator [] (int loc)
{
    return m[loc];
}

Vector3 Vector3::add(Vector3 a)
{
    Vector3 b;
	//
	b.set(m[0] + a[0], m[1] + a[1], m[2] + a[2]);

    return b;
}

Vector3 Vector3::operator + (Vector3 a)
{
    return add(a);
}

Vector3 Vector3::subtract(Vector3 a)
{
    Vector3 b;

    //
	b.set(m[0] - a[0], m[1] - a[1], m[2] - a[2]);

    return b;
}

Vector3 Vector3::operator - (Vector3 a)
{
    return subtract(a);
}

Vector3 Vector3::negate(void)
{
    Vector3 b;

    //
	b.set(-m[0], -m[1], -m[2]);

    return b;
}

Vector3 Vector3::scale(float s)
{
    Vector3 b;

    //
	b.set(s*m[0], s*m[1], s*m[2]);

    return b;
}

Vector3 Vector3::multiply(float a)
{
    Vector3 b;

    //
	b.set(a*m[0], a*m[1], a*m[2]);

    return b;
}

Vector3 Vector3::operator * (float a)
{
    return multiply(a);
}

Vector3 Vector3::multiply(Vector3 a)
{
    Vector3 b;

    //Coomponent-wise multiplication
	b.set(m[0] * a[0], m[1] * a[1], m[2] * a[2]);

    return b;
}

Vector3 Vector3::operator * (Vector3 a)
{
    return multiply(a);
}


float Vector3::dot(Vector3 a)
{
    //
	float result = m[0] * a[0] + m[1] * a[1] + m[2] * a[2];
    return result;
}

Vector3 Vector3::cross(Vector3 a)
{
    Vector3 b;

    //
	b.set(	a[2] * m[1] - a[1] * m[2],
			a[0] * m[2] - a[2] * m[0],
			a[1] * m[0] - a[0] * m[1]);

    return b;
}

float Vector3::angle(Vector3 a)
{
    //
	float result = acos((dot(a)/(a.magnitude() * magnitude())));
	return result;
}

float Vector3::magnitude(void)
{
    //
	float result = sqrt(m[0] * m[0] + m[1] * m[1] + m[2] * m[2]);
	return result;
}

Vector3 Vector3::normalize(void)
{
    Vector3 b;

    //
	float mag = magnitude();

	if (mag != 0)
		b = multiply(1 / mag);
	else
		b = multiply(0);

    return b;
}

Vector4 Vector3::toVector4(float w)
{
    Vector4 b(m[0], m[1], m[2], w);
    return b;
}

void Vector3::print(std::string comment)
{
    std::cout << comment << std::endl;
    std::cout << "<x:" << m[0] <<  ", y:" << m[1] << ", z:" << m[2] << ">" << std::endl;
}