"""
Used in support of nks.py
by K. Urner
"""

# from Dr. Zelle's graphics library
from graphics import GraphWin, Point, Rectangle

class Canvas(object):

    def __init__(self, width, rows, pixelsize):
        self.pixelsize = pixelsize
        self.c = GraphWin('NKS',width*pixelsize, rows*pixelsize, False)
        self.c.setBackground('black')        

    def drawcell(self, thepoint):
        therow = thepoint[0]*self.pixelsize
        thecol = thepoint[1]*self.pixelsize

        therect = Rectangle(Point(therow, thecol),
                            Point(therow + self.pixelsize-1,
                              thecol + self.pixelsize-1))
        therect.setFill('yellow')
        therect.setOutline('yellow')            
        therect.draw(self.c)

    def showimage(self):
        self.c.flush()
        g = raw_input("Hit Enter on this line to close window")
        self.c.close()