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# -*- coding: utf-8 -*-
# vispy: gallery 5:20:2
# -----------------------------------------------------------------------------
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
"""
Draw a Line
===========
Simple demonstration of SceneCanvas containing a single line entity
as its entire scenegraph.
"""
import sys
import numpy as np
from vispy import app, scene
canvas = scene.SceneCanvas(size=(800, 600), keys='interactive')
N = 1000
pos = np.empty((N, 2), np.float32)
pos[:, 0] = np.linspace(50., 750., N)
#
color = np.ones((N, 4), dtype=np.float32)
color[:, 0] = np.linspace(0, 1, N)
color[:, 1] = color[::-1, 0]
lines = []
print('Generating points...')
for i in range(20):
pos = pos.copy()
pos[:, 1] = np.random.normal(scale=5, loc=(i+1)*30, size=N)
line = scene.visuals.Line(pos=pos, color=color, parent=canvas.scene)
lines.append(line)
line.transform = scene.transforms.STTransform()
print('Done')
def update(event):
for line in lines:
scale = [np.sin(np.pi * event.elapsed)+2,
np.cos(np.pi * event.elapsed)+2]
line.transform.scale = scale
timer = app.Timer('auto', connect=update, start=True)
if __name__ == '__main__':
canvas.show()
if sys.flags.interactive == 0:
app.run()
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