#pragma once

//直角坐标系
typedef struct CoordCartesian
{
    DOUBLE x;
    DOUBLE y;
    DOUBLE z;
} CoordCartesian;

// 球坐标系
typedef struct CoordSpherical
{
    DOUBLE r;
    DOUBLE θ;
    DOUBLE φ;
} CoordSpherical;

// 柱坐标系
typedef struct CoordCylindrical
{
    DOUBLE r;
    DOUBLE θ;
    DOUBLE z;
} CoordCylindrical;

class CS
{
public:
    CS(void);
    ~CS(void);

public:
    static void CartesianToSpherical(CoordCartesian &pcc, CoordSpherical &pcg);
    static void CartesianToCylindrical(CoordCartesian &pcc, CoordCylindrical &pcg);
    static DOUBLE EnvelopeValue(DOUBLE a, DOUBLE b);
};