led.py

from Tkinter import *

class LED:
    """Basic LED functionality to display Hexadecimal numbers
    (may be extended to handle all alphanumeric characters) as
    a 7-segment LED display."""
    master = None
    canvas = None
    height = 200
    width = 100
    chars = {'0':'abcdef',
             '1':'ed',
             '2':'bcefg',
             '3':'cdefg',
             '4':'adeg',
             '5':'acdfg',
             '6':'abcdfg',
             '7':'edf',
             '8':'abcdefg',
             '9':'acdefg',
             'a':'abdefg',
             'b':'abcdg',
             'c':'abcf',
             'd':'bcdeg',
             'e':'abcfg',
             'f':'abfg',
             'g':'abcdf',
             'h':'abdeg',
             'i':'ab',
             'j':'cde',
             'l':'abc',
             'm':'bdfg',
             'n':'bdg',
             'o':'bcdg',
             'p':'abefg',
             'q':'adefg',
             'r':'bg',
             's':'acdfg',
             'u':'bcd',
             'y':'adeg',
             'z':'bcefg',
             ' ':'',
             '' :'',
             '_':'c'}

    def __init__(self, master, value, locX, locY, width = 100, height = 200):
        self.canvas = Canvas(master, height=height, width=width, bg='black')
        self.canvas.place(x=locX, y=locY)
        self.height = height
        self.width = width
        self.drawSeg()
        self.colorSeg(value)

    def __call__(self, value):
        self.colorSeg(value)

    def drawSeg(self):
        widthRatio = int(0.20*self.width) # vertical segment thickness
        heightRatio = int(0.1*self.height) # horizontal segment thickness
        padx = int(0.1*self.width) # padding of inner rectangle from canvas
        pady = int(0.05*self.height)
        segHeight = self.height/2 - pady # height of vertical segment
        coords = {
        'a':[(padx,                             pady),
             (padx,                             pady + segHeight),
             (padx + widthRatio,                pady + segHeight - heightRatio),
             (padx + widthRatio,                pady + heightRatio)],

        'b':[(padx,                             pady + segHeight),
             (padx,                             pady + segHeight*2),
             (padx + widthRatio,                pady + segHeight*2 - heightRatio),
             (padx + widthRatio,                pady + segHeight + heightRatio)],

        'e':[(self.width - padx,                pady),
             (self.width - padx,                pady + segHeight),
             (self.width - (padx + widthRatio), pady + segHeight - heightRatio),
             (self.width - (padx + widthRatio), pady + heightRatio)],

        'd':[(self.width - padx,                pady + segHeight),
             (self.width - padx,                pady + segHeight*2),
             (self.width - (padx + widthRatio), pady + segHeight*2 - heightRatio),
             (self.width - (padx + widthRatio), pady + segHeight + heightRatio)],

        'f':[(padx,                             pady),
             (self.width - padx,                pady),
             (self.width - (padx + widthRatio), pady + heightRatio),
             (padx + widthRatio,                pady + heightRatio)],

        'c':[(padx,                             pady + segHeight*2),
             (self.width - padx,                pady + segHeight*2),
             (self.width - (padx + widthRatio), pady + segHeight*2 - heightRatio),
             (padx + widthRatio,                pady + segHeight*2 - heightRatio)],

        'g':[(padx,                             pady + segHeight),
             (padx + widthRatio,                pady + segHeight - heightRatio),
             (self.width - (padx + widthRatio), pady + segHeight - heightRatio),
             (self.width - padx,                pady + segHeight),
             (self.width - (padx + widthRatio), pady + segHeight + heightRatio),
             (padx + widthRatio,                pady + segHeight + heightRatio)],
                 }
        for char in coords.keys():
            self.canvas.create_polygon(coords[char], fill='black', tag=char, outline='black', width=3)

    def drawSeg2(self):
    """Alternate design of led's"""
        padx = int(0.05*self.height)
        pady = int(0.1*self.width)
        hSegThick = int((1.0/8)*self.width)
        vSegThick = int((1.0/16)*self.height)
        segHeight = self.height/2 - padx/2 - hSegThick
        vCoords = [(padx + vSegThick/2, pady + hSegThick/2            ),
                   (padx              , pady + hSegThick              ),
                   (padx              , pady + segHeight              ),
                   (padx + vSegThick/2, pady + hSegThick/2 + segHeight),
                   (padx + vSegThick  , pady + segHeight              ),
                   (padx + vSegThick  , pady + hSegThick              )]
        hCoords = [(padx + vSegThick/2             , pady + hSegThick/2),
                   (padx + vSegThick               , pady + hSegThick  ),
                   (self.width - padx              , pady + hSegThick  ),
                   (self.width - padx + vSegThick/2, pady + hSegThick/2),
                   (self.width - padx              , pady              ),
                   (padx + vSegThick               , pady)]
        coords = {'a':transform(vCoords, 0                  , 0          ),
                  'b':transform(vCoords, 0                  , segHeight  ),
                  'd':transform(vCoords, self.width - padx*2, segHeight  ),
                  'e':transform(vCoords, self.width - padx*2, 0          ),
                  'c':transform(hCoords, 0                  , segHeight*2),
                  'f':transform(hCoords, 0                  , 0          ),
                  'g':transform(hCoords, 0                  , segHeight  )}
        for char in coords.keys():
            self.canvas.create_polygon(coords[char], fill='#200000', tag=char, outline='black', width=3)


    def colorSeg(self, value):
        if not str(value) in self.chars.keys(): return
        segList = self.chars[str(value)]
        for char in set('abcdefg').difference(set(segList)):
            self.canvas.itemconfigure(char, fill='#200000')
        for char in segList:
            self.canvas.itemconfigure(char, fill='#FF0000')

        '''for char in set(segList).intersection(set(coords.keys())):
                self.canvas.create_polygon(coords[char], fill='red')'''

# Note for optimization of segment generation:
# Define just two or four points and obtain remaining by adding or subtracting
# appropriate measures.

def transform(l, inrx, inry):
    return [(i + inrx,j + inry) for i,j in l]

def f(e):
    global count, l1
    try:
        l1(count.next())
    except StopIteration:
        print "All done"

def main():
    global count, l1
    count = (i for i in sorted(LED.chars.keys()))
    root = Tk()
    root.geometry('320x400+50+50')
    l1 = LED(root, "1", 50, 50)
    root.bind('<Button-1>', f)
    root.mainloop()

if __name__ == '__main__':
    main()