from visual import *
from visual.text import *
import random

#1 draw 2 axis.
xaxis = arrow(pos=(0,0), axis=(1,0), shaftwidth=0.01)
yaxis = arrow(pos=(0,0), axis=(0,1), shaftwidth=0.01)

# Work only for capital letters. It will print * for other letters
xtex = text(pos=(1,0), string='X', color=color.red, height=0.08, width=0.08, justify='center')
ytex = text(pos=(0,1), string='Y', color=color.green, height=0.06, width=0.06, justify='center')

#1 offsets curve for parabola
step = 0.01
a=1
#draw base curve
t=arange(-a, a+step, step)
curve(x=t, y=t**2)
#draw offset curve
#1 Draw one offset
#2 Draw all offsets