Double Points ( DPoint )

Definition

An instance dp of type DPoint is a point (a, b), where a and b are doubles. We call a the x-coordinate of dp and b the y-coordinate of dp.

#include < AGD/DPoint.h >

Creation

DPoint	dp	creates an instance dp of type DPoint initialized to the point (0, 0).
DPoint	dp(double x, double y)	creates an instance dp of type DPoint initialized to the point (x, y).
DPoint	dp(const DPoint& p)	creates an instance dp of type DPoint initialized to the point dp.

Operations

double	dp.xcoord()	returns the x-coordinate of dp.
double	dp.ycoord()	returns the y-coordinate of dp.
void	dp.xcoord(double x)	sets the x-coordinate of dp to x.
void	dp.ycoord(double y)	sets the y-coordinate of dp to y.
DPoint&	dp.inc_x(double dx)	increments the x-coordinate of dp by dx. Returns a reference to dp.
DPoint&	dp.inc_y(double dy)	increments the y-coordinate of dp by dy. Returns a reference to dp.
bool	dp == const DPoint& p	Test for equality.
bool	dp != const DPoint& p	Test for inequality.
DPoint	dp + const DPoint& dp1	returns the addition (of coordinates).
DPoint	dp - const DPoint& dp1	returns the subtraction (of coordinates).
DPoint&	dp += const DPoint& dp1	adds dp1 to dp. Returns a reference to dp.
DPoint&	dp -= const DPoint& dp1	subtracts dp1 from dp. Returns a reference to dp.
DPoint	double x * const DPoint& dp
		returns the multiplication of dp with the scalar x.
ostream&	ostream& O << const DPoint& dp
		writes dp to output stream O.
istream&	istream& I >> DPoint& dp	reads the coordinates of dp (two double numbers) from input stream I.