# endless_passing_show_1.py
# >>>>>>>>>>>>>>>>>>>>>
from Tkinter import *
import math
import time
root = Tk()
root.title("Vase Show")
cw = 100 # canvas width
ch = 200 # canvas height
chart_1 = Canvas(root, width=cw, height=ch, background="black")
chart_1.grid(row=0, column=0)
cycle_period = 100 # time between new positions of the images milliseconds).
#==============================================
posn_x1 = 0
posn_x2 = 100
posn_x3 = 200
posn_x4 = 300
posn_y = 00
im_brass = PhotoImage(file = "/constr/pics1/brass_vase.gif")
im_red = PhotoImage(file = "/constr/pics1/red_vase.gif")
im_blue = PhotoImage(file = "/constr/pics1/blue_vase.gif")
im_glass = PhotoImage(file = "/constr/pics1/glass_vase.gif")
#=============================================
def animdelay():
chart_1.update() # This refreshes the drawing on the canvas.
chart_1.after(cycle_period) # This makes execution pause for 100 milliseconds.
chart_1.delete(ALL) # This erases *almost* everything on the canvas.
for j in range(0,600): # Number of steps to be taken - arbitrary.
posn_x1 -= 1
posn_x2 -= 1
posn_x3 -= 1
posn_x4 -= 1
chart_1.create_image(posn_x1,posn_y,anchor=NW, image=im_brass)
chart_1.create_image(posn_x2,posn_y,anchor=NW, image=im_red)
chart_1.create_image(posn_x3,posn_y,anchor=NW, image=im_blue)
chart_1.create_image(posn_x4,posn_y,anchor=NW, image=im_glass)
# The numerical parameters below could be turned into
# a 'for' loop and allow the loop to be compact and interminable.
if j == 100:
posn_x1 = 300
if j == 200:
posn_x2 = 300
if j == 400:
posn_x3 = 300
if j == 400:
posn_x4 = 300
animdelay()
root.mainloop()