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Plot parametric graphs with parametric_graph(x_function, y_function, tMin, tMax).

from math import *
from kandinsky import *
from turtle import *
#from my_functions import *

tMin = 0
tMax = 2*pi

def x_function(x):
  return sqrt(x)
  
def y_function(x):
  return x
  
def parametric_graph(it=1000,fx=x_function,fy=y_function,tmax=tMax,tmin=tMin,xmin=-14.4,xmax=14.4,ymin=-10,ymax=10):
  col=color(0,0,255)
  blk=color(0,0,0)
  gry=color(220, 220, 220)
  y_0=int(ymax*221/(ymax-ymin))
  x_0=int(xmin*319/(xmin-xmax))
  gridx = int(xmin)
  while gridx <= xmax:
    x=int(319.0*(gridx-xmin)/(xmax-xmin))
    for y in range(222):
      set_pixel(x,y,gry)
    gridx+=1
  gridy = int(ymin)
  while gridy <= ymax:
    y=int(221.0*(gridy-ymin)/(ymax-ymin))
    for x in range(320):
      set_pixel(x,y,gry)
    gridy+=1
  for x in range(320):
    set_pixel(x,y_0,blk)
  for y in range(222):
    set_pixel(x_0,y,blk)
  for t in range(it):
    T = tmin+t*(tmax-tmin)/float(it)
    try:
      X=fx(T)
      Y=fy(T)
      pixel_x=int((X-xmin)*319/(xmax-xmin))
      pixel_y=int((Y-ymax)*221/(ymin-ymax))
      set_pixel(pixel_x,pixel_y,col)
    except:
      X=0
      Y=0