# U05_Ex15_ExamBarGraph.py
#
#  Author: Joseph Cloud
#  Course: Coding for OOP
# Section: A3
#    Date: 13 Oct 2017
#     IDE: PyCharm Community Edition
#
# Assignment Info
#   Exercise: 15
#     Source: Python Programming
#    Chapter: 5
#
# Program Description
# This program displays a graph of students' exam scores
# Algorithm (pseudocode)
# Introduction window
# Get filename
# Open file for reading
# Read file and split to get names and grades of students
# Close the file
# Create window for the graph
# Loop creating and drawing text and rectangles based off of list info
# Wait for mouse click to close the window

import re
from tkinter.filedialog import askopenfilename
from graphics import *

def main():
    window = GraphWin('Introduction', 600, 150)
    Text(Point(300,75), 'This Program Returns a Graph of Students Names and Their Corresponding Grades').draw(window)
    window.getMouse()
    window.close()

    fileName = askopenfilename()

    file = open(fileName, 'r')

    numStud = file.readline()

    delimiters = " ", "\n"
    splitPattern = '|'.join(map(re.escape, delimiters))
    stuGrad = re.split(splitPattern, file.read())

    file.close()

    window = GraphWin('Exam Scores', 200, len(stuGrad)*20)

    Text(Point(100, len(stuGrad)*20-10), 'Exam Scores Bar Graph').draw(window)

    for i in range(numStud):
        Text(Point(35, 40*i-20), '{0:>10}'.format(stuGrad[i*2])).draw(window)
        Rectangle(Point(80, 40*i-15), Point(80+int(stuGrad[1+i*2]), 40*i-25)).draw(window)

    window.getMouse()
    window.close()
main()