import math

#Herit list: entries a Vector
class Curve(list):
    #Name of coordinate function 
    RC="Circle"

    #Call Curve's Calc Method
    def R(self,t):
        method=None
        if ( hasattr(self,self.RC) ):
            method=getattr(self,self.RC)
 
        v=[0.0,0.0]
        if (method):
            v=method(t)
        else:
            print "Warning! No method!!!",self.RC
            
        return Vector(v)

    t1=0.0
    t2=2.0*pi

    ##!
    ##! Generate sequence of n equidistant t-values.
    ##!
    
    #Parameter values
    ts=[]
    
    def Calc_ts(self,n):
        self.ts=[]
        t=self.t1
        for i in range(n+1):
            self.ts.append( t )
            t+=self.dt

        return self.ts

    ##!
    ##! Calculate and store self.r(t) Vectors.
    ##!
    
    def Calc_Rs(self,ts=[]):
        ts=self.Get_ts(ts)
            
        for i in range( len(ts)):
             self.append( self.R(ts[i]) )
             
        return self.R