# clock.py By Anton Vredegoor (anton.vredegoor@gmail.com)
# last edit: july 2009,
# license: GPL
# enjoy!
"""
A very simple clock.
The program transforms worldcoordinates into screencoordinates
and vice versa according to an algorithm found in: "Programming
principles in computer graphics" by Leendert Ammeraal.
"""
from Tkinter import *
from time import localtime
from datetime import timedelta,datetime
from math import sin, cos, pi
import sys, types, os
_inidle = type(sys.stdin) == types.InstanceType and \
sys.stdin.__class__.__name__ == 'PyShell'
class transformer:
def __init__(self, world, viewport):
self.world = world
self.viewport = viewport
def point(self, x, y):
x_min, y_min, x_max, y_max = self.world
X_min, Y_min, X_max, Y_max = self.viewport
f_x = float(X_max-X_min) /float(x_max-x_min)
f_y = float(Y_max-Y_min) / float(y_max-y_min)
f = min(f_x,f_y)
x_c = 0.5 * (x_min + x_max)
y_c = 0.5 * (y_min + y_max)
X_c = 0.5 * (X_min + X_max)
Y_c = 0.5 * (Y_min + Y_max)
c_1 = X_c - f * x_c
c_2 = Y_c - f * y_c
X = f * x + c_1
Y = f * y + c_2
return X , Y
def twopoints(self,x1,y1,x2,y2):
return self.point(x1,y1),self.point(x2,y2)
class clock:
def __init__(self,root,deltahours = 0):
self.world = [-1,-1,1,1]
self.bgcolor = '#000000'
self.circlecolor = '#808080'
self.timecolor = '#ffffff'
self.circlesize = 0.09
self._ALL = 'all'
self.pad = 25
self.root = root
WIDTH, HEIGHT = 400, 400
root.bind("<Escape>", lambda _ : root.destroy())
self.delta = timedelta(hours = deltahours)
self.canvas = Canvas(root,
width = WIDTH,
height = HEIGHT,
background = self.bgcolor)
viewport = (self.pad,self.pad,WIDTH-self.pad,HEIGHT-self.pad)
self.T = transformer(self.world,viewport)
self.root.title('Clock')
self.canvas.bind("<Configure>",self.configure())
self.canvas.pack(fill=BOTH, expand=YES)
self.poll()
def configure(self):
self.redraw()
def redraw(self):
sc = self.canvas
sc.delete(self._ALL)
width = sc.winfo_width()
height =sc.winfo_height()
sc.create_rectangle([[0,0],[width,height]],
fill = self.bgcolor, tag = self._ALL)
viewport = (self.pad,self.pad,width-self.pad,height-self.pad)
self.T = transformer(self.world,viewport)
self.paintgrafics()
def paintgrafics(self):
start = -pi/2
step = pi/6
for i in range(12):
angle = start+i*step
x, y = cos(angle),sin(angle)
self.paintcircle(x,y)
self.painthms()
self.paintcircle(0,0)
def painthms(self):
T = datetime.timetuple(datetime.utcnow()-self.delta)
x,x,x,h,m,s,x,x,x = T
self.root.title('%02i:%02i:%02i' %(h,m,s))
angle = -pi/2 + (pi/6)*h + (pi/6)*(m/60.0)
x, y = cos(angle)*.60,sin(angle)*.60
scl = self.canvas.create_line
scl(apply(self.T.twopoints,[0,0,x,y]), fill = self.timecolor,
tag =self._ALL, width = 6)
angle = -pi/2 + (pi/30)*m + (pi/30)*(s/60.0)
x, y = cos(angle)*.80,sin(angle)*.80
scl(apply(self.T.twopoints,[0,0,x,y]), fill = self.timecolor,
tag =self._ALL, width = 3)
angle = -pi/2 + (pi/30)*s
x, y = cos(angle)*.95,sin(angle)*.95
scl(apply(self.T.twopoints, [0,0,x,y]), fill = self.timecolor,
tag =self._ALL, arrow = 'last')
def paintcircle(self,x,y):
ss = self.circlesize / 2.0
mybbox = [-ss+x,-ss+y,ss+x,ss+y]
sco = self.canvas.create_oval
sco(apply(self.T.twopoints,mybbox), fill = self.circlecolor,
tag =self._ALL)
def poll(self):
self.configure()
self.root.after(200,self.poll)
def main():
root= Tk()
# deltahours: how far are you from utc?
# someone should automatize that, but I sometimes want to display
# time as if I am in another timezone ...
clock(root,deltahours = -2)
if not _inidle:
root.mainloop()
if __name__=='__main__':
main()
