# -*- coding: utf-8 -*-
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# vispy: gallery 1
"""
Spectrogram and Line Plot
=========================

A spectrogram and waveform plot of 1D data.
"""

import numpy as np

from vispy import plot as vp

# Create a logarithmic chirp
fs = 1000.
N = 10000
t = np.arange(N) / float(fs)
f0, f1 = 1., 500.
phase = (t[-1] / np.log(f1 / f0)) * f0 * (pow(f1 / f0, t / t[-1]) - 1.0)
data = np.cos(2 * np.pi * phase)

fig = vp.Fig(size=(800, 400), show=False)
fig[0:2, 0].spectrogram(data, fs=fs, clim=(-100, -20))
fig[2, 0].plot(np.array((t, data)).T, marker_size=0)

if __name__ == '__main__':
    fig.show(run=True)