[算法][包围盒]AABB简单类

#pragma once
#include <iostream>
//一个假的点类型
struct Vector3
{
float x;
float y;
float z;
};

class AABB
{
public:
AABB();
AABB(const AABB &aabb);
~AABB();
void add(const Vector3 &v);
void clear();
void makeAABB(Vector3 V[], int n);

Vector3 min, max, center;
};

void aabbPrint(AABB &ab);

#include "AABB.h"

AABB::AABB()
{
}

AABB::AABB(const AABB &aabb)
{
min = aabb.min;
max = aabb.max;
center = aabb.center;
}

void AABB::clear()
{
min.x = min.y = min.z = FLT_MAX;
//careful: This is not FLT_MIN, 'cause FLT_MIN is a little larger than 0,
//hence not a minus value.
max.x = max.y = max.z = -FLT_MAX;
}

void AABB::add(const Vector3 &v)
{
if (v.x < min.x) min.x = v.x;
if (v.y < min.y) min.y = v.y;
if (v.z < min.z) min.z = v.z;
if (v.x > max.x) max.x = v.x;
if (v.y > max.y) max.y = v.y;
if (v.z > max.z) max.z = v.z;
}

//make AABB out of Vector3 points
void AABB::makeAABB(Vector3 V[], int n)
{
if (!V) return;

for (int i = 0; i < n; i++)
add(V[i]);

center.x = (min.x + max.x) * 0.5f;
center.y = (min.y + max.y) * 0.5f;
center.z = (min.z + max.z) * 0.5f;
}

AABB::~AABB()
{
}

void aabbPrint(AABB &ab)
{
std::cout<<"AABB min is: ";
ab.min.x;
ab.min.y;
ab.min.z;
std::cout<<"AABB max is: ";
ab.max.x;
ab.max.y;
ab.max.z;
std::cout<<std::endl;
}