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

def maximum(data):
    highest = data[0]
    for number in data:
        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):
    return [minimum(data), maximum(data)]  


def clamp(value, low, high):
    return max(low, min(value, high)) 


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

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


def get_x_values(points):
    x_values = []
    for x, y in points:
        x_values.append(x)
    return x_values 

def get_y_values(points):
    y_values = []
    for x, y in points:
        y_values.append(y) 
    return y_values