# transform.py
# ------------
# By MWC Contributors
# The functions in this module transform data. 
# None of them are finished; this is your job!

import sys

def maximum(data):
    highest = None
    for number in data:
        if highest is None:
            highest = number
        if number > highest:
            highest = number
    return highest
   
    
def minimum(data):
    lowest = None
    for number in data:
        if lowest is None:
            lowest = number
        if number < lowest:
            lowest = number
    return lowest


def bounds(data):
    highest = None
    lowest = None
    for number in data:
        if highest is None:
            highest = number
        if lowest is None:
            lowest = number
        if number > highest:
            highest = number
        if number < lowest:
            lowest = number
    return [lowest, highest]
   
def clamp(value, low, high):
    if value >= low and value <= high:
        return value
    elif value < low:
        return low
    elif value > high:
        return high


def ratio(value, start, end):
    ratio = (value - start)/(end - start)
    return clamp(ratio,0,1)



def scale(value, domain_min, domain_max, range_min, range_max):
    scale = range_min + (ratio(value, domain_min, domain_max)) * (range_max - range_min)
    return scale


def get_x_values(points):
    for (x, y) in points:
        return ([x], )
    
def get_y_values(points):
    for (x, y) in points:
        return ([y], )