# 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 = 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):
    return [minimum(data), maximum(data)]

def clamp(value, low, high):
    return maximum([low, minimum([value, high])])

def ratio(value, start, end):
    unclamped_ratio=(value-start)/(end-start)
    return clamp(unclamped_ratio, 0.0, 1.0)

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

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