"""
 demo.py

 a little graphics demo

   .................       (8,60) top right
   .
   .    |                  20
   .  | | | | |            10
   .  0 1 2 3 4  .. 7 8     0
   ...................    -10
   (-1,-10) lower left

 Jim Mahoney | March 8 2021
"""

from graphics import *

def main():
    
    # make up some numbers to put on a bar graph
    numbers = [10, 20, 4, 17, 30, 50, 18]
    
    window = GraphWin("a little demonstration", 800, 800)
    window.setCoords(-1, -10, 8, 60)

    boundary = Rectangle( Point(0,0), Point(7.5, 55) )
    boundary.setOutline('grey')
    boundary.setWidth(3)
    boundary.draw(window)

    position = 0    # where rectangle is horizontally
    for number in numbers:
        p1 = Point(position, 0)  # bottom left of rectangle
        p2 = Point(position+1, number)
        rect = Rectangle(p1, p2)
        rect.setFill('green')
        rect.draw(window)
        position = position + 1  # next rectangle is over a bit
    
    wait = input("Done? ")

main()