Double Line Segments ( DSegment )

Definition

An instance ds of type DSegment is a line segment [p, q], where p and q are double points. We call p the source point and q the target point of the segment.

#include < AGD/DSegment.h >

Creation

DSegment	ds	creates an instance ds of type DSegment initialized to the segment [(0, 0),(0, 0)].
DSegment	ds(const DPoint& p, const DPoint& q)
		creates an instance ds of type DSegment initialized to the segment [p, q].

Operations

const DPoint&	ds.source()	returns a reference to the source point of ds.
const DPoint&	ds.target()	returns a reference to the target point of ds.
bool	ds.horizontal()	returns true iff ds is horizontal, i.e the y-coordinate of the source point equals the y-coordinate of the target point.
bool	ds.vertical()	returns true iff ds is vertical, i.e the x-coordinate of the source point equals the x-coordinate of the target point.