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Class Rod - the model of 3D-Line

test applet and codes are here

 * Class Rod, the model of partial line on the 3D space,
 * 			spanned from it's stern to it's bow
 *					created by Classiclll, 6/28/2008
 	Rod(Loc s, Loc b)		// only constructor you can use
 	Loc at(float t)			// location at t, at(0):stern, at(me.length):bow
	Rod move(Loc to)		// move stern to "to"
	Rod shift(Loc diff)		// shift stern by "diff"
	Rod shiftI(Loc diff)		// inverse shift
	Rod scale(float factor)		// scale the size of me by factor
	Rod scaleI(float factor)	// inverse scaling
	Loc intersect2D(Rod to) 	// intersect position on the x-y plane
	Rod rotate(Loc dir, float ang)	// rotate me around the directonal vector
	Rod rotate(Rod ax, float ang)	// rotate me around the ax (Rod, model of 3D line)
	float signedDist2D(Rod pt)// distance with sign of left/right side on the x-y plane
	float dist2D(Loc pt)		// distance between "me" and "pt" on the x-y plane
	Loc normal(Loc pt)		// the normal directional vector from "me" to "pt"
	Rod ortho(Loc pt)		// the shortest rod connecting from "me" to "pt"
	Rod nearest(Rod to)		// the shortest rod connecting from "me" to "to"
	float dist(Loc pt)		// distance between "me" and "pt"
	boolean having(Loc pt) 		// is "me" having "pt" on myself ?
	float dist(Rod to)		// least distance between "me" and line "to"
	boolean crossing(Rod to) 	// are "me" and "to" crossing each other ?
	float length()			// length of me
	Loc stern()			// location of the stern of me
	Loc bow()			// location of the bow of me
	Loc fore()			// foward direction of me, the unit vector
	Boolean equals(Object to)
	String toString()