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| 1 | +"""Animate the xkcd comic.""" |
| 2 | +import random |
| 3 | +import sys |
| 4 | + |
| 5 | +from js import DOMParser |
| 6 | +from js import document |
| 7 | +from js import setInterval |
| 8 | +from pyodide.ffi import create_proxy |
| 9 | +from pyodide.http import open_url |
| 10 | + |
| 11 | + |
| 12 | +class Antigravity: |
| 13 | + """Implement antigravity.""" |
| 14 | + |
| 15 | + url = "./antigravity.svg" |
| 16 | + |
| 17 | + def __init__(self, target=None, interval=10, append=True, fly=False): |
| 18 | + """Construct antigravity.""" |
| 19 | + target = target or sys.stdout._out |
| 20 | + self.target = ( |
| 21 | + document.getElementById(target) if isinstance(target, str) else target |
| 22 | + ) |
| 23 | + doc = DOMParser.new().parseFromString( |
| 24 | + open_url(self.url).read(), "image/svg+xml" |
| 25 | + ) |
| 26 | + self.node = doc.documentElement |
| 27 | + if append: |
| 28 | + self.target.append(self.node) |
| 29 | + else: |
| 30 | + self.target.replaceChildren(self.node) |
| 31 | + self.xoffset, self.yoffset = 0, 0 |
| 32 | + self.interval = interval |
| 33 | + if fly: |
| 34 | + self.fly() |
| 35 | + |
| 36 | + def fly(self): |
| 37 | + """Schedule a taking off-and-fly.""" |
| 38 | + setInterval(create_proxy(self.move), self.interval) |
| 39 | + |
| 40 | + def move(self): |
| 41 | + """Move the item.""" |
| 42 | + char = self.node.getElementsByTagName("g")[1] |
| 43 | + char.setAttribute("transform", f"translate({self.xoffset}, {-self.yoffset})") |
| 44 | + self.xoffset += random.normalvariate(0, 1) / 20 |
| 45 | + if self.yoffset < 50: |
| 46 | + self.yoffset += 0.1 |
| 47 | + else: |
| 48 | + self.yoffset += random.normalvariate(0, 1) / 20 |
| 49 | + |
| 50 | + |
| 51 | +_auto = Antigravity(append=True) |
| 52 | +fly = _auto.fly |
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