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app.py
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app.py
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import asyncio
import app
import math
from events.input import Buttons, BUTTON_TYPES
from app_components import clear_background
class WormholeApp(app.App):
def __init__(self):
self.button_states = Buttons(self)
self.r_max = 120
self.r_min = 50
self.r_step = -4
self.nsteps = int(abs((self.r_max - self.r_min) / self.r_step))
self.alpha_step = 1.0 / self.nsteps
self.path_idx = 0
path_step = (2 * math.pi) / self.nsteps
path_wiggle = 10
self.path = [
( path_wiggle * math.sin(path_step * i), path_wiggle * math.cos(path_step * 2 * i) )
for i in range(self.nsteps)
]
def update(self, delta):
if self.button_states.get(BUTTON_TYPES["CANCEL"]):
# The button_states do not update while you are in the background.
# Calling clear() ensures the next time you open the app, it stays open.
# Without it the app would close again immediately.
self.button_states.clear()
self.minimise()
def draw(self, ctx):
clear_background(ctx)
ctx.save()
r = self.r_max
alpha = 1.0
for i in range(self.nsteps):
idx = (i + self.path_idx) % len(self.path)
c = self.path[idx]
ctx.rgba(0.2, 0, 1.0, alpha).arc(c[0], c[1], r, 0, 2 * math.pi, True).stroke()
r += self.r_step
alpha -= self.alpha_step
self.path_idx += 1
ctx.restore()
__app_export__ = WormholeApp