# jch 31-OCT-2005; created TinyVector.py from Point.py utility
# $Header: /jch/play/cvsroot/twist/Point.py,v 1.2 2003/05/30 03:20:04 jch Exp $
#// Copyright 2003 YON - Jan C. Hardenbergh. Permission to copy is
#// granted as long as this copyright and this URL are maintained:
#// http://www.jch.com/NURBS/
#
import Numeric
import math

class TinyVector:
    def __init__(self, value):
        self.data = [value[0], value[1], value[2]]
    def __getitem__(self, index):
        return self.data[index]
    def __add__(self, other):
        return  TinyVector([self.data[0]+other[0], self.data[1]+other[1], self.data[2]+other[2]])
    def __sub__(self, other):
        return  TinyVector([self.data[0]-other[0], self.data[1]-other[1], self.data[2]-other[2]])
    def __mul__(self, other):
        return TinyVector([self.data[0]*other, self.data[1]*other, self.data[2]*other])
    def __div__(self, other):
        return TinyVector([self.data[0]/other, self.data[1]/other, self.data[2]/other])
    def DistanceTo(self, other):
        x = self.data[0]-other[0]
        y = self.data[1]-other[1]
        z = self.data[2]-other[2]
        return math.sqrt(x*x+y*y+z*z)

    def Length(self):
        length = math.sqrt(self.data[0]*self.data[0]+self.data[1]*self.data[1]+self.data[2]*self.data[2])
        return length

    def Normalized(self):
        length = math.sqrt(self.data[0]*self.data[0]+self.data[1]*self.data[1]+self.data[2]*self.data[2])
        return self.__div__(length)

    def Dot(self,other):
        return self.data[0]*other[0]+self.data[1]*other[1]+self.data[2]*other[2]
    
    # a x b = (a2b3 - a3b2) i + (a3b1 - a1b3) j + (a1b2 - a2b1) k
    def Cross(self,other):
        x =  self.data[1]*other[2]-self.data[2]*other[1]
        y =  self.data[2]*other[0]-self.data[0]*other[2]
        z =  self.data[0]*other[1]-self.data[1]*other[0]
	return TinyVector([x,y,z])
    
    
    def Print(self):
        print "TinyVector : %g, %g, %g" % (self.data[0], self.data[1], self.data[2])
    def Assign(self,x,y,z):
        self.data[0] = x
	self.data[1] = y
	self.data[2] = z
    def GetVertex(self):
        return self.data