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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# vispy: testskip
import numpy as np
from vispy import app, gloo
from vispy.visuals.collections import PathCollection
c = app.Canvas(size=(800, 800), show=True, keys='interactive')
gloo.set_viewport(0, 0, c.size[0], c.size[1])
gloo.set_state("translucent", depth_test=False)
def star(inner=0.5, outer=1.0, n=5):
R = np.array([inner, outer] * n)
T = np.linspace(0, 2 * np.pi, 2 * n, endpoint=False)
P = np.zeros((2 * n, 3))
P[:, 0] = R * np.cos(T)
P[:, 1] = R * np.sin(T)
return P
n = 2500
S = star(n=5)
P = np.tile(S.ravel(), n).reshape(n, len(S), 3)
P *= np.random.uniform(5, 10, n)[:, np.newaxis, np.newaxis]
P[:, :, :2] += np.random.uniform(0, 800, (n, 2))[:, np.newaxis, :]
P = P.reshape(n * len(S), 3)
P = 2 * (P / (800, 800, 1)) - 1
paths = PathCollection(mode="agg")
paths.append(P, closed=True, itemsize=len(S))
paths["linewidth"] = 1.0
paths['viewport'] = 0, 0, 800, 800
@c.connect
def on_draw(e):
gloo.clear('white')
paths.draw()
@c.connect
def on_resize(e):
width, height = e.size[0], e.size[1]
gloo.set_viewport(0, 0, width, height)
paths['viewport'] = 0, 0, width, height
app.run()
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