class ClockConfig:

defaults--override in instance or subclass

size = 200 # width=height
bg, fg = 'beige', 'brown' # face, tick colors
hh, mh, sh, cog = 'black', 'navy', 'blue', 'red' # clock hands, center
picture = None # face photo file

class PhotoClockConfig(ClockConfig):

sample configuration

size = 320
picture = '../gifs/ora-pp.gif'
bg, hh, mh = 'white', 'blue', 'orange'

###############################################################################

Digital display object

###############################################################################

class DigitalDisplay(Frame):
def init(self, parent, cfg):
Frame.init(self, parent)
self.hour = Label(self)
self.mins = Label(self)
self.secs = Label(self)
self.ampm = Label(self)
for label in self.hour, self.mins, self.secs, self.ampm:
label.config(bd=4, relief=SUNKEN, bg=cfg.bg, fg=cfg.fg)
label.pack(side=LEFT) # TBD: could expand, and scale font on resize

def onUpdate(self, hour, mins, secs, ampm, cfg):
mins = str(mins).zfill(2) # or '%02d' % x
self.hour.config(text=str(hour), width=4)
self.mins.config(text=str(mins), width=4)
self.secs.config(text=str(secs), width=4)
self.ampm.config(text=str(ampm), width=4)

def onResize(self, newWidth, newHeight, cfg):
pass # nothing to redraw here

###############################################################################

Analog display object

###############################################################################

class AnalogDisplay(Canvas):
def init(self, parent, cfg):
Canvas.init(self, parent,
width=cfg.size, height=cfg.size, bg=cfg.bg)
self.drawClockface(cfg)
self.hourHand = self.minsHand = self.secsHand = self.cog = None

def drawClockface(self, cfg): # on start and resize
if cfg.picture: # draw ovals, picture

756 | Chapter 11: Complete GUI Programs