#!/usr/bin/env python
# coding: UTF-8
# license: GPL
#
## @package _08c_clock
#
# @author Paulo Roma
# @since 01/05/2014
# Based on the code of Anton Vredegoor (anton.vredegoor@gmail.com)
##
# A very simple analog clock.
#
# The program transforms worldcoordinates into screencoordinates
# and vice versa according to an algorithm found in:
# "Programming principles in computer graphics" by Leendert Ammeraal.
import sys, types, os
from time import localtime
from datetime import timedelta,datetime
from math import sin, cos, pi
from threading import Thread
try:
from tkinter import * # python 3
except ImportError:
try:
from mtTkinter import * # for thread safe
except ImportError:
from Tkinter import * # python 2
hasPIL = True
# we need PIL for resizing the background image
# in Fedora do: yum install python-pillow-tk
# or yum install python3-pillow-tk
try:
from PIL import Image, ImageTk
except ImportError:
hasPIL = False
## Class for handling the mapping from window coordinates
# to viewport coordinates.
#
class mapper:
## Constructor.
#
# @param world window rectangle.
# @param viewport screen rectangle.
#
def __init__(self, world, viewport):
self.world = world
self.viewport = viewport
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)
self.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)
self.c_1 = X_c - self.f * x_c
self.c_2 = Y_c - self.f * y_c
## Maps a single point from world coordinates to viewport (screen) coordinates.
#
# @param x, y given point.
# @return a new point in screen coordinates.
#
def __windowToViewport(self, x, y):
X = self.f * x + self.c_1
Y = self.f * -y + self.c_2 # Y axis is upside down
return X , Y
## Maps two points from world coordinates to viewport (screen) coordinates.
#
# @param x1, y1 first point.
# @param x2, y2 second point.
# @return two new points in screen coordinates.
#
def windowToViewport(self,x1,y1,x2,y2):
return self.__windowToViewport(x1,y1),self.__windowToViewport(x2,y2)
## Class for creating a new thread.
#
class makeThread (Thread):
"""Creates a thread."""
## Constructor.
# @param func function to run on this thread.
#
def __init__ (self,func):
Thread.__init__(self)
self.__action = func
self.debug = False
## Destructor.
#
def __del__ (self):
if ( self.debug ): print ("Thread end")
## Starts this thread.
#
def run (self):
if ( self.debug ): print ("Thread begin")
self.__action()
## Class for drawing a simple analog clock.
# The backgroung image may be changed by pressing key 'i'.
# The image path is hardcoded. It should be available in directory 'images'.
#
class clock:
## Constructor.
#
# @param deltahours time zone.
# @param sImage whether to use a background image.
# @param w canvas width.
# @param h canvas height.
# @param useThread whether to use a separate thread for running the clock.
#
def __init__(self,root,deltahours = 0,sImage = True,w = 400,h = 400,useThread = False):
self.world = [-1,-1,1,1]
self.imgPath = './images/fluminense.png' # image path
if hasPIL and os.path.exists (self.imgPath):
self.showImage = sImage
else:
self.showImage = False
self.setColors()
self.circlesize = 0.09
self._ALL = 'handles'
self.root = root
width, height = w, h
self.pad = width/16
if self.showImage:
self.fluImg = Image.open(self.imgPath)
self.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 = mapper(self.world,viewport)
self.root.title('Clock')
self.canvas.bind("<Configure>",self.resize)
self.root.bind("<KeyPress-i>", self.toggleImage)
self.canvas.pack(fill=BOTH, expand=YES)
if useThread:
st=makeThread(self.poll)
st.debug = True
st.start()
else:
self.poll()
## Called when the window changes, by means of a user input.
#
def resize(self,event):
sc = self.canvas
sc.delete(ALL) # erase the whole canvas
width = sc.winfo_width()
height = sc.winfo_height()
imgSize = min(width, height)
self.pad = imgSize/16
viewport = (self.pad,self.pad,width-self.pad,height-self.pad)
self.T = mapper(self.world,viewport)
if self.showImage:
flu = self.fluImg.resize((int(0.8*0.8*imgSize), int(0.8*imgSize)), Image.ANTIALIAS)
self.flu = ImageTk.PhotoImage(flu)
sc.create_image(width/2,height/2,image=self.flu)
else:
self.canvas.create_rectangle([[0,0],[width,height]], fill = self.bgcolor)
self.redraw() # redraw the clock
## Sets the clock colors.
#
def setColors(self):
if self.showImage:
self.bgcolor = 'antique white'
self.timecolor = 'dark orange'
self.circlecolor = 'dark green'
else:
self.bgcolor = '#000000'
self.timecolor = '#ffffff'
self.circlecolor = '#808080'
## Toggles the displaying of a background image.
#
def toggleImage(self,event):
if hasPIL and os.path.exists (self.imgPath):
self.showImage = not self.showImage
self.setColors()
self.resize(event)
## Redraws the whole clock.
#
def redraw(self):
start = pi/2 # 12h is at pi/2
step = pi/6
for i in range(12): # draw the minute ticks as circles
angle = start-i*step
x, y = cos(angle),sin(angle)
self.paintcircle(x,y)
self.painthms() # draw the handles
if not self.showImage:
self.paintcircle(0,0) # draw a circle at the centre of the clock
## Draws the handles.
#
def painthms(self):
self.canvas.delete(self._ALL) # delete the handles
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 + m/60.0)
x, y = cos(angle)*.60,sin(angle)*0.70
scl = self.canvas.create_line
# draw the hour handle
scl(self.T.windowToViewport(0,0,x,y), fill = self.timecolor, tag=self._ALL, width = self.pad/3)
angle = pi/2 - pi/30 * (m + s/60.0)
x, y = cos(angle)*.80,sin(angle)*0.90
# draw the minute handle
scl(self.T.windowToViewport(0,0,x,y), fill = self.timecolor, tag=self._ALL, width = self.pad/5)
angle = pi/2 - pi/30 * s
x, y = cos(angle)*.95,sin(angle)*0.95
# draw the second handle
scl(self.T.windowToViewport(0,0,x,y), fill = self.timecolor, tag=self._ALL, arrow = 'last')
## Draws a circle at a given point.
#
# @param x,y given point.
#
def paintcircle(self,x,y):
ss = self.circlesize / 2.0
sco = self.canvas.create_oval
sco(self.T.windowToViewport(-ss+x,-ss+y,ss+x,ss+y), fill = self.circlecolor)
## Animates the clock, by redrawing everything after a certain time interval.
#
def poll(self):
self.redraw()
self.root.after(200,self.poll)
## Main program for testing.
#
# @param argv time zone, image background flag,
# clock width, clock height, create thread flag.
#
def main(argv=None):
if argv is None:
argv = sys.argv
if len(argv) > 2:
try:
deltahours = int(argv[1])
sImage = (argv[2] == 'True')
w = int(argv[3])
h = int(argv[4])
t = (argv[5] == 'True')
except ValueError:
print ("A timezone is expected.")
return 1
else:
deltahours = 3
sImage = True
w = h = 400
t = False
root= Tk()
root.geometry ('+0+0')
# deltahours: how far are you from utc?
# Sometimes the clock may be run from another timezone ...
clock(root,deltahours,sImage,w,h,t)
root.mainloop()
if __name__=='__main__':
sys.exit(main())
