Having an issue getting TKinter to track mouse movement to an object - python-3.x

Question

I was unsure whether to post the full code or not, but here's what I have:
from tkinter import *
from random import randint
HEIGHT = 500
WIDTH = 800
MID_X = WIDTH/2
MID_Y = HEIGHT/2
SHIP_R = 15
SHIP_SPD = 10
bub_id = list()
bub_r = list()
bub_speed = list()
MIN_BUB_R = 10
MAX_BUB_R = 30
MAX_BUB_SPD = 6
GAP = 100
window = Tk()
window.title('Bubble Blaster')
c = Canvas(window, width=WIDTH, height=HEIGHT, bg='darkblue')
c.pack()
ship_id = c.create_polygon(5, 5, 5, 25, 30, 15, fill='red')
ship_id2 = c.create_oval(0, 0, 30, 30, outline='red')
c.move(ship_id, MID_X, MID_Y)
c.move(ship_id2, MID_X, MID_Y)
def move_ship(event):
fixed = True
while fixed == True:
ship_x, ship_y = event.x, event.y
c.move(ship_id, ship_x, ship_y)
c.move(ship_id2, ship_x, ship_y)
sleep(0.01)
def create_bubble():
x = WIDTH + GAP
y = randint(0, HEIGHT)
r = randint(MIN_BUB_R, MAX_BUB_R)
id1 = c.create_oval(x-r, y-r, x+r, y+r, outline='white')
bub_id.append(id1)
bub_r.append(r)
bub_speed.append(randint(1, MAX_BUB_SPD))
def move_bubbles():
for i in range(len(bub_id)):
c.move(bub_id[i], -bub_speed[i], 0)
def get_coords(id_num):
pos = c.coords(id_num)
x = (pos[0] + pos[2])/2
y = (pos[1] + pos[3])/2
return x, y
def del_bubble(i):
del bub_r[i]
del bub_speed[i]
c.delete(bub_id[i])
del bub_id[i]
def clean_up_bubs():
for i in range(len(bub_id)-1, -1, -1):
x, y = get_coords(bub_id[i])
if x < -GAP:
del_bubble(i)
from math import sqrt
def distance(id1, id2):
x1, y1 = get_coords(id1)
x2, y2 = get_coords(id2)
return sqrt((x2-x1)**2 + (y2-y1)**2)
def collision():
points = 0
for bub in range(len(bub_id)-1, -1, -1):
if distance(ship_id2, bub_id[bub]) < (SHIP_R+bub_r[bub]):
points += (bub_r[bub] + bub_speed[bub])
del_bubble(bub)
return points
c.create_text(50, 30, text='TIME', fill='white')
c.create_text(150, 30, text='SCORE', fill='white')
time_text = c.create_text(50, 50, fill='white')
score_text = c.create_text (150, 50, fill='white')
def show_score(score):
c.itemconfig(score_text, text=str(score))
def show_time(time_left):
c.itemconfig(time_text, text=str(time_left))
from time import sleep, time
BUB_CHANCE = 20
TIME_LIMIT = 30
BONUS_SCORE = 1000
# MAIN GAME LOOP
c.bind("<B1_Motion>", move_ship)
score = 0
bonus = 0
end = time() + TIME_LIMIT
while time() < end:
if randint(1, BUB_CHANCE) == 1:
create_bubble()
move_bubbles()
move_ship("<B1_Motion>")
clean_up_bubs()
score += collision()
if (int(score / BONUS_SCORE)) > bonus:
bonus += 1
end += TIME_LIMIT
show_score(score)
show_time(int(end-time()))
window.update()
sleep(0.01)
c.create_text(MID_X, MID_Y, \
text='PARTY TIME, EXCELLENT', fil='white', font=('Helvetica', 30))
c.create_text(MID_X, MID_Y + 30, \
text='Score: ' + str(score), fill='white')
c.create_text(MID_X, MID_Y + 45, \
text='BONU TIME: ' + str(bonus*TIME_LIMIT), fill='white')
I'm a complete beginner when it comes to python, and have been given an assignment to only use tkinter and the standard libraries to give mouse movement to this "game". I just can't seem to get the right grasp of it. Any suggestions would be appreciated!

Answer 1

The first step is to remove your while loop, and put most of your functionality into a function. Put everything you want to do in a single frame of animation into this function.
Next, call this function on a regular interval using the after command. This allows the event loop to run continuously, which is important for your UI to be responsive. You can do your time() < end calculation inside this function, and use the result to break the cycle once time is up.
It looks something like this:
def draw_one_frame():
if randint(1, BUB_CHANCE) == 1:
create_bubble()
move_bubbles()
# move_ship("<B1_Motion>")
clean_up_bubs()
score += collision()
if (int(score / BONUS_SCORE)) > bonus:
bonus += 1
end += TIME_LIMIT
show_score(score)
show_time(int(end-time()))
if time() < end:
after(10, draw_one_frame)
You can use the first parameter to after to control how many frames per second you wish your program to run at.
Next, you need to handle mouse movement. You do this by creating a binding to the movement of the mouse. You do this outside of the draw_one_frame method. It looks something like this:
c.bind("<B1-Motion>", move_ship)
You also need to remove the infinite loop from move_ship, and also remove the sleep. You simply need to do all the calculations for the current mouse position. The function will be already be looping -- being called once each time the mouse moves.
Finally, you need to call window.mainloop() after all your other code, so that the program can process events. This should be the very last line of your program. It will run until the window is destroyed.