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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# vispy: testskip
import numpy as np
from vispy import app, gloo
from vispy.geometry import Triangulation
from vispy.visuals.collections import PathCollection, TriangleCollection
canvas = app.Canvas(size=(800, 800), show=True, keys='interactive')
gloo.set_viewport(0, 0, canvas.size[0], canvas.size[1])
gloo.set_state("translucent", depth_test=False)
def triangulate(P):
n = len(P)
S = np.repeat(np.arange(n + 1), 2)[1:-1]
S[-2:] = n - 1, 0
S = S.reshape(len(S) // 2, 2)
T = Triangulation(P[:, :2], S)
T.triangulate()
points = T.pts
triangles = T.tris.ravel()
P = np.zeros((len(points), 3), dtype=np.float32)
P[:, :2] = points
return P, triangles
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
paths = PathCollection("agg", color='shared')
triangles = TriangleCollection("raw", color='shared')
P0 = star()
P1, tris = triangulate(P0)
n = 1000
for i in range(n):
c = i / float(n)
x, y = np.random.uniform(-1, +1, 2)
s = 25 / 800.0
triangles.append(P1 * s + (x, y, i / 1000.), tris, color=(1, 0, 0, .5))
paths.append(
P0 * s + (x, y, (i - 1) / 1000.), closed=True, color=(0, 0, 0, .5))
paths["linewidth"] = 1.0
paths['viewport'] = 0, 0, 800, 800
@canvas.connect
def on_draw(e):
gloo.clear('white')
triangles.draw()
paths.draw()
@canvas.connect
def on_resize(event):
width, height = event.size
gloo.set_viewport(0, 0, width, height)
paths['viewport'] = 0, 0, width, height
app.run()
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