FishTank

# Connor Maloney, Assignment #6
# Creates a fishtank with moving fish based on .gif files

from Tkinter import *
import random

# create GUI
window = Tk()
window.title("Fish Tank")

tankBackground = PhotoImage(file="tank.gif")
fishRight = PhotoImage(file="fishRight.gif")
fishLeft = PhotoImage(file="fishLeft.gif")

windowHeight = 525      # based on size of tank gif
windowWidth = 700
x = windowWidth/2
y = windowHeight/2

canvas = Canvas(window, width=windowWidth, height=windowHeight)
canvas.grid(row=0, column=0, columnspan=5, sticky="NSEW")
canvas.create_image(windowWidth/2, windowHeight/2, image=tankBackground)

def updateFishFunction(start, x, y, dx, dy):
    if x >= 685:        # for one side of the vertical wall
        start = canvas.coords(start, -1000, -1000)
        start = canvas.create_image(x, y, image=fishLeft)
        dx = dx * -1
    if x <= 15:         # for the other side of the wall for the fish to bounce off
        start = canvas.coords(start, -1000, -1000)
        start = canvas.create_image(x, y, image=fishRight)
        dx = dx * -1
    if y >= 510 or y <= 15:         # to bounce off the top but without switching images
        dy = dy * -1
    x = x + dx
    y = y + dy
    canvas.coords(start, x, y)
    canvas.after(100, updateFishFunction, start, x, y, dx, dy)

def addFishFunction():
    x = random.randrange(685)
    y = random.randrange(485)
    dx = random.randrange(-3, 3)        # velocity of the fish
    dy = random.randrange(-3, 3)        
    if dx < 0:
        start = canvas.create_image(random.randrange(680), random.randrange(500), image=fishLeft)
    elif dx > 0:
        start = canvas.create_image(random.randrange(680), random.randrange(500), image=fishRight)
    else:
        dx = 2
        start = canvas.create_image(random.randrange(680), random.randrange(500), image=fishRight)
    updateFishFunction(start, x, y, dx, dy)

addFishButton = Button(window, text="Add Fish", command=addFishFunction)
addFishButton.grid(row=1, column=2, sticky="NSEW")          # column 2 and earlier columnspan 5 to make smaller button

window.mainloop()