Class IPoint3

See Also: Class Point3.

class IPoint3

Description:

This class describes a 3D point using integer x, y and z coordinates. Methods are provided to add and subtract points, multiply and divide by scalars, and element by element multiply and divide two points. All methods are implemented by the system.

Methods:

Data Members:

public:

int x,y,z;

Prototype:

IPoint3()

Remarks:

Constructor. No initialization is performed.

Prototype:

IPoint3(int X, int Y, int Z)

Remarks:

Constructor. x, y, and z are initialized to the values specified.

Prototype:

IPoint3(const IPoint3& a)

Remarks:

Constructor. x, y, and z are initialized to the IPoint3 specified.

Prototype:

IPoint3(int ai[3])

Remarks:

Constructor. x, y, and z are initialized to. ai[0], ai[1], and ai[2] respectively.

Prototype:

int DotProd(const IPoint3&) const;

Remarks:

Returns the dot product of two IPoint3s.

Prototype:

IPoint3 CrossProd(const IPoint3&) const;

Remarks:

Returns the cross product of two IPoint3's (vectors).

Operators:

Prototype:

int& operator[](int i)

const int& operator[](int i) const

Remarks:

Allows access to x, y and z using the [ ] operator.

Return Value:

An index of 0 will return x, 1 will return y, 2 will return z.

Prototype:

operator int*()

Remarks:

Conversion function. Returns the address of the IPoint3.

Prototype:

IPoint3 operator-() const

Remarks:

Unary - operator. Negates x, y and z.

Prototype:

IPoint3 operator+() const

Remarks:

Unary +. Returns the point unaltered.

Prototype:

IPoint3& operator-=(const IPoint3&);

Remarks:

Subtracts a IPoint3 from this IPoint3.

Prototype:

IPoint3& operator+=(const IPoint3&);

Remarks:

Adds a IPoint3 to this IPoint3.

Prototype:

IPoint3 operator-(const IPoint3&) const;

Remarks:

Subtracts a IPoint3 from a IPoint3.

Prototype:

IPoint3 operator+(const IPoint3&) const;

Remarks:

Adds a IPoint3 to a IPoint3.

Prototype:

int operator*(const IPoint3&) const;

Remarks:

Returns the dot product of two IPoint3s.

Prototype:

IPoint3 operator^(const IPoint3&) const;

Remarks:

The cross product of two IPoint3's (vectors).

Prototype:

int operator==(const IPoint3& p) const

Remarks:

Test for equality between two IPoint3's.

Return Value:

Nonzero if the IPoint3's are equal; otherwise 0.

 

The following functions are not members of IPoint3 but are available for use:

Prototype:

int MaxComponent(const IPoint3&);

Remarks:

Returns the component with the maximum absolute value. 0=x, 1=y, 2=z.

Prototype:

int MinComponent(const IPoint3&);

Remarks:

Returns the component with the minimum absolute value. 0=x, 1=y, 2=z.

Prototype:

inline float Length(const IPoint3& v)

Remarks:

Returns the 'Length' of the point. This is sqrt(v.x*v.x+v.y*v.y+v.z*v.z)

Prototype:

ostream &operator<<(ostream&, const IPoint3&);

Remarks:

Formats the IPoint3 for output as in:

(x, y, z)