My Code:
import Tkinter
from decimal import Decimal
import numpy
import time
__author__ = 'Sayakiss'
class Ball:
def __init__(self, position, velocity, radius, name):
self.position = position
self.velocity = velocity
self.radius = radius
self.name = name
class BallSimulator:
def __init__(self, balls):
self.balls = balls
def sim(self, delta):
for ball in self.balls:
ball.position[0] += ball.velocity[0] * delta
ball.position[1] += ball.velocity[1] * delta
class BallCanvas(Tkinter.Canvas):
def draw(self):
for ball in self.simulator.balls:
self.create_oval(ball.position[0] - ball.radius,
ball.position[1] - ball.radius,
ball.position[0] + ball.radius,
ball.position[1] + ball.radius)
def sim(self):
# while True: it should be sim again and again, but I couldn't add a while True here, what should I do?
self.delete("all")
self.draw()
time.sleep(0.01)
self.simulator.sim(Decimal('0.01'))
def __init__(self, ball_simulator, master=None):
Tkinter.Canvas.__init__(self, master)
self.simulator = ball_simulator
self.sim()
position = numpy.array([Decimal('10'), Decimal('10')])
velocity = numpy.array([Decimal('1'), Decimal('2')])
radius = 5
name = 'b1'
ball = Ball(position, velocity, radius, name)
simulator = BallSimulator([ball])
root = Tkinter.Tk()
root.columnconfigure(0, weight=1)
root.rowconfigure(0, weight=1)
canvas = BallCanvas(simulator, master=root)
canvas.grid(column=0, row=0, sticky=(Tkinter.N, Tkinter.W, Tkinter.E, Tkinter.S))
root.mainloop()
root.destroy()
My idea is:
Initialize Canvas =>
clean Canvas => draw ball => calculate the next position of the ball +
^ |
| |
+---------------------------------------------------------------+
When I dive into the Canvas, I find the only way to execute the BallCanvas.sim() in the root.mainloop() is bind it to an event. I read the canvas doc through, but I couldn't find an event which always triggered.
So, what should I do now to implement such a Ball Moving Simulator?
