# Simple example of animation of a fish
# swimming.  This is a simplified python
# adaptation of the java program
# FishWinks.java
#
#  H. J. Bernstein, 11 Jan 2011

from Tkinter import * 

window = Tk() 
canvas = Canvas(window, bg="blue", width = 400, height = 300)
diameter = 60
bodycolor = "yellow"
seacolor = "blue"
linecolor = "red"
canvas.pack()
#Draw the sea with waves
canvas.create_polygon(0,0,0,diameter/2.,402,\
                      diameter/2.,402,0,0,0,\
                      fill="white", outline="white")
for ii in range(0,402,diameter):
    canvas.create_oval(ii,diameter/6,ii+diameter,\
                       2*diameter/3,fill="white",outline="white")
#front of the fish
ledge = 402
#Draw a dorsal fin
canvas.create_arc(ledge+diameter+diameter/4-diameter/3,150-2*diameter/3,\
                  ledge+diameter+diameter/4+diameter/3,150-diameter/3,\
                  start=90,extent=90,fill=bodycolor,outline=bodycolor,\
                  tag = 'fish')
canvas.create_oval(ledge+diameter+diameter/4-diameter/6,150-2*diameter/3,\
                   ledge+diameter+diameter/4+diameter/6,150-diameter/3,\
                   fill=seacolor,outline=seacolor,tag= 'fish')
#Draw the body with the mouth working
canvas.create_arc(ledge,150-diameter/2,\
                  ledge+2*diameter,150+diameter/2,\
                  start=0,extent=170,fill=bodycolor,outline=bodycolor,\
                  tag = 'fish')
canvas.create_arc(ledge,150-diameter/2,\
                  ledge+2*diameter,150+diameter/2,\
                  start=190,extent=170,fill=bodycolor,outline=bodycolor,\
                  tag = 'fish')
canvas.create_arc(ledge,150-diameter/2,\
                  ledge+2*diameter,150+diameter/2,\
                  start=170,extent=20,fill=seacolor,outline=seacolor,\
                  tag = 'fishmouthup')
canvas.create_arc(ledge,150-diameter/2,\
                  ledge+2*diameter,150+diameter/2,\
                  start=170,extent=20,fill=seacolor,outline=seacolor,\
                  tag = 'fishmouthdown')
#cover the corner of the mouth
canvas.create_arc(ledge+0.5*diameter,150-diameter/2,\
                   ledge+1.5*diameter,150+diameter/2,\
                   start=90,extent=180,fill=bodycolor,outline=bodycolor,\
                   tag = 'fish')
#add a tail, make it waggle
canvas.create_arc(ledge+2*diameter,150-diameter/4, \
                  ledge+3*diameter,150+diameter/4,\
                  start=90,extent=180,fill=bodycolor,outline=bodycolor,\
                  tag = 'fish')
canvas.create_arc(ledge+2*diameter+diameter/4+1,150-diameter/2,\
                  ledge+5*diameter,150+diameter/2,
                  start=90,extent=180,fill=seacolor,outline=seacolor,
                  tag = 'fishtail')
basershift=0;
for i in range(0, 400+diameter*3):
    canvas.move('fish',-1,0 )
    j = (i % 42) -10
    if j > 10:
        j = 21-j
    rshift = (j*diameter)/90
    k = i % 10
    if (k < 5):
      canvas.move('fishmouthup',-1,-1)
      canvas.move('fishmouthdown',-1,1)
    else:
      canvas.move('fishmouthup',-1,1)
      canvas.move('fishmouthdown',-1,-1)
    canvas.move('fishtail',-1,0)
    if basershift > rshift:
        canvas.move('fishtail',-1,0)
        basershift = basershift-1
    else:
        canvas.move('fishtail',+1,0)
        basershift = basershift+1
    canvas.after(10)
    canvas.update()