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# -*- coding: utf-8 -*-
# vispy: gallery 5:10:1
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
"""
Animated Line Visual
====================
Demonstration of animated Line visual.
"""
import sys
import numpy as np
from vispy import app, scene
# vertex positions of data to draw
N = 200
pos = np.zeros((N, 2), dtype=np.float32)
x_lim = [50., 750.]
y_lim = [-2., 2.]
pos[:, 0] = np.linspace(x_lim[0], x_lim[1], N)
pos[:, 1] = np.random.normal(size=N)
# color array
color = np.ones((N, 4), dtype=np.float32)
color[:, 0] = np.linspace(0, 1, N)
color[:, 1] = color[::-1, 0]
canvas = scene.SceneCanvas(keys='interactive', show=True)
grid = canvas.central_widget.add_grid(spacing=0)
viewbox = grid.add_view(row=0, col=1, camera='panzoom')
# add some axes
x_axis = scene.AxisWidget(orientation='bottom')
x_axis.stretch = (1, 0.1)
grid.add_widget(x_axis, row=1, col=1)
x_axis.link_view(viewbox)
y_axis = scene.AxisWidget(orientation='left')
y_axis.stretch = (0.1, 1)
grid.add_widget(y_axis, row=0, col=0)
y_axis.link_view(viewbox)
# add a line plot inside the viewbox
line = scene.Line(pos, color, parent=viewbox.scene)
# auto-scale to see the whole line.
viewbox.camera.set_range()
def update(ev):
global pos, color, line
pos[:, 1] = np.random.normal(size=N)
color = np.roll(color, 1, axis=0)
line.set_data(pos=pos, color=color)
timer = app.Timer()
timer.connect(update)
timer.start(0)
if __name__ == '__main__' and sys.flags.interactive == 0:
app.run()
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