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Class Tag - the model of 3D-Plane

* Class Tag, the model of (partial) plane on the 3D space,
 * 			spanned from it's stern and star to it's bow and port
 *					created by Classiclll, 7/28/2008
	Tag(Loc s, Loc b, Loc r)	// only constructor you can use, and
 	Tag(Tag frm)			// constructor you can use
	Loc at(float s, float b)	// location at (s,b),
					// at(0,0):stern, at(0,me.length):bow, at(me.width,0):star
	Tag move(Loc to)		// move stern to "to"
	Tag shift(Loc diff)		// shift stern by "diff"
	Tag shiftI(Loc diff)		// inverse shift
	Tag scale(float factor)		// scale the size of me by factor
	Tag scaleI(float factor)	// inverse scaling
	Tag rotate(Loc ax, float ang)	// rotate my direction around the axs
	Tag rotate(Rod ax, float ang)	// rotate my direction around the ax
	Tag rotate(Loc dir, float ang)	// rotate me around the directonal vector
	Tag rotate(Rod ax, float ang)	// rotate me around the ax (Rod, model of 3D line)
	Rod intersect(Tag to) 		// intersect line with me and to
	Loc intersect(Rod ln) 		// intersect point with me and ln
	float angle(Tag to)		// angle between each normal vector, me and to
	float dist(Loc pt)		// distance between "me" and "pt", = length of ortho(pt)
	Rod ortho(Loc pt)		// the orthogonal rod connecting from "pt" to "me"
	boolean having(Loc pt)		// is "me" having "pt" on myself ?
	float length()			// length of me
	float width()			// width of me
	Loc stern()			// location of the stern of me, the base position
	Loc bow()			// location of the bow of me
	Loc starBoard()		// location of the star of me
	Loc fore()			// foward direction of me, the unit vector
	Loc star()			// right direction of me, the unit vector
	Loc normal()			// upword direction of me, the unit vector
	Rod keel()			// line model of me's front/end, the Rod
	Boolean equals(Object to)
	String toString()