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Inadvertently see a paragraph with Tkinter Library written fireworks program , Just followed .
Design concept ： By splitting a particle on the picture into X Number of particles to simulate the explosion effect . Particles can occur " expand ”, It means that they will move at a constant speed and have equal angles to each other . In this way, we can simulate the picture of fireworks blooming in the form of an outward expanding circle . After a certain time , Particles will enter " Free fall ” stage , That is, because of gravity, they began to fall to the ground , Like fireworks that go out after blooming .
First, we write a particle class , Represents each particle in a fireworks event , Include size , colour , position , Properties such as velocity and functions of the three stages experienced by particles , Namely ： expand , fall , disappear .
'''
particles class
Particles are randomly generated in the air , Become a circle , Fall , disappear
attribute :
- id: Particle id
- x, y: Coordinates of particles
- vx, vy: Speed of change in coordinates
- total: total
- age: Duration of particle existence
- color: colour
- cv: canvas
- lifespan: Maximum duration
'''
class Particle:
def __init__(self, cv, idx, total, explosion_speed, x=0. y=0. vx=0. vy=0.
size=2. color='red', lifespan=2,
**kwargs):
self.id = idx
self.x = x
self.y = y
self.initial_speed = explosion_speed
self.vx = vx
self.vy = vy
self.total = total
self.age = 0
self.color = color
self.cv = cv
self.cid = self.cv.create_oval(
x - size, y - size, x + size,
y + size, fill=self.color)
self.lifespan = lifespan
def update(self, dt):
self.age += dt
# Particle range expansion
if self.alive() and self.expand():
move_x = cos(radians(self.id * 360 / self.total)) * self.initial_speed
move_y = sin(radians(self.id * 360 / self.total)) * self.initial_speed
self.cv.move(self.cid, move_x, move_y)
self.vx = move_x / (float(dt) * 1000)
# Fall with free fall
elif self.alive():
move_x = cos(radians(self.id * 360 / self.total))
# we technically don't need to update x, y because move will do the job
self.cv.move(self.cid, self.vx + move_x, self.vy + GRAVITY * dt)
self.vy += GRAVITY * dt
# Remove particles that exceed the maximum duration
elif self.cid is not None:
cv.delete(self.cid)
self.cid = None
# Expanded time
def expand (self):
return self.age <= 1.2
# Is the particle within the maximum lifetime
def alive(self):
return self.age <= self.lifespan
Next we need to create a list , Each sublist is a fireworks , It contains a list of particles , Particles in each list have the same x,y coordinate , size , colour , Initial speed .
The source code is as follows ：
import tkinter as tk
from PIL import Image, ImageTk
from time import time, sleep
from random import choice, uniform, randint
from math import sin, cos, radians
# Simulated gravity
GRAVITY = 0.05
# Color options （ Random or in order ）
colors = ['red', 'blue', 'yellow', 'white', 'green', 'orange', 'purple',
'seagreen', 'indigo', 'cornflowerblue']
'''
particles class
Particles are randomly generated in the air , Become a circle , Fall , disappear
attribute :
- id: Particle id
- x, y: Coordinates of particles
- vx, vy: Speed of change in coordinates
- total: total
- age: Duration of particle existence
- color: colour
- cv: canvas
- lifespan: Maximum duration
'''
class Particle:
def __init__(self, cv, idx, total, explosion_speed, x=0. y=0. vx=0. vy=0.
size=2. color='red', lifespan=2,
**kwargs):
self.id = idx
self.x = x
self.y = y
self.initial_speed = explosion_speed
self.vx = vx
self.vy = vy
self.total = total
self.age = 0
self.color = color
self.cv = cv
self.cid = self.cv.create_oval(
x - size, y - size, x + size,
y + size, fill=self.color)
self.lifespan = lifespan
def update(self, dt):
self.age += dt
# Particle range expansion
if self.alive() and self.expand():
move_x = cos(radians(self.id * 360 / self.total)) * self.initial_speed
move_y = sin(radians(self.id * 360 / self.total)) * self.initial_speed
self.cv.move(self.cid, move_x, move_y)
self.vx = move_x / (float(dt) * 1000)
# Fall with free fall
elif self.alive():
move_x = cos(radians(self.id * 360 / self.total))
# we technically don't need to update x, y because move will do the job
self.cv.move(self.cid, self.vx + move_x, self.vy + GRAVITY * dt)
self.vy += GRAVITY * dt
# Remove particles that exceed the maximum duration
elif self.cid is not None:
cv.delete(self.cid)
self.cid = None
# Expanded time
def expand (self):
return self.age <= 1.2
# Is the particle within the maximum lifetime
def alive(self):
return self.age <= self.lifespan
'''
The loop call keeps going
'''
def simulate(cv):
t = time()
explode_points = []
wait_time = randint(10, 100)
numb_explode = randint(6, 10)
# Create a two-dimensional list of all particles expanded at the same time
for point in range(numb_explode):
objects = []
x_cordi = randint(50, 550)
y_cordi = randint(50, 150)
speed = uniform(0.5, 1.5)
size = uniform(0.5, 3)
color = choice(colors)
explosion_speed = uniform(0.2, 1)
total_particles = randint(10, 50)
for i in range(1, total_particles):
r = Particle(cv, idx=i, total=total_particles,
explosion_speed=explosion_speed, x=x_cordi, y=y_cordi,
vx=speed, vy=speed, color=color, size=size, lifespan=uniform(0.6, 1.75))
objects.append(r)
explode_points.append(objects)
total_time = .0
# 1.8s Has been expanding within
while total_time < 1.8:
sleep(0.01)
tnew = time()
t, dt = tnew, tnew - t
for point in explode_points:
for item in point:
item.update(dt)
cv.update()
total_time += dt
# Loop call
root.after(wait_time, simulate, cv)
def close(*ignore):
""" Exit program , close window """
global root
root.quit()
if __name__ == '__main__':
root = tk.Tk()
cv = tk.Canvas(root, height=360, width=480)
# Choosing a nice background will make the effect more amazing !
image = Image.open("./image.jpg")
photo = ImageTk.PhotoImage(image)
cv.create_image(0, 0, image=photo, anchor='nw')
cv.pack()
root.protocol("WM_DELETE_WINDOW", close)
root.after(100, simulate, cv)
root.mainloop()
design sketch （ Please ignore the background ）：
The above is the whole content of this article , I hope it will be helpful to your study , I also hope you can support the script house .
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