Wrj4P5
edit== Class Rod - the model of 3D-Line ==
[http://www.geocities.jp/classiclll_newweb/RodTest/applet/index.html test applet and codes are here]
{{{ code java
* 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
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 shortest rod connecting 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(Rod to)
String toString()
}}}