{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [],
   "source": [
    "%matplotlib qt\n",
    "import numpy as np\n",
    "import matplotlib.pyplot as plt\n",
    "\n",
    "n = 10000\n",
    "\n",
    "t = np.linspace(0,200*np.pi,n)\n",
    "omega = 2\n",
    "f_t = np.sin(omega*t)*np.cos(50/n*t)\n",
    "\n",
    "dt_max = 100\n",
    "x_s = np.full([dt_max,],np.NaN)\n",
    "y_s = np.full([dt_max,],np.NaN)\n",
    "\n",
    "# fig_ref = plt.figure()\n",
    "# ax_ref = fig_ref.add_subplot(111)\n",
    "# line_obj_ref = ax_ref.plot(t,f_t, marker='.')\n",
    "# plt.show(block=False)\n",
    "# plt.pause(3)\n",
    "# plt.close(fig_ref)\n",
    "\n",
    "fig = plt.figure()\n",
    "ax1 = fig.add_subplot(211)\n",
    "ax2 = fig.add_subplot(212)\n",
    "ax1.set_xlim([0,t[100+50]])\n",
    "ax1.set_ylim([-1.05,1.05])\n",
    "ax2.set_xlim([t[0],t[100+50]])\n",
    "ax2.set_ylim([-1.05,1.05])\n",
    "line_obj1, = ax1.plot(0,0, marker='.')\n",
    "line_obj2, = ax2.plot(0,0, marker='.')\n",
    "plt.show(block=False)\n",
    "plt.pause(0.01)\n",
    "\n",
    "for i in range(n):\n",
    "    if i <= dt_max:\n",
    "        x_s[:i] = t[:i]\n",
    "        y_s[:i] = f_t[:i]\n",
    "    else:\n",
    "        x_s = t[i-dt_max:i]\n",
    "        y_s = f_t[i-dt_max:i]\n",
    "        ax1.set_xlim([t[i-dt_max],t[i]+t[50]])\n",
    "        ax2.set_xlim([t[0],t[i]+(t[i]-t[0])/2])\n",
    "    \n",
    "    line_obj1.set_xdata(x_s)\n",
    "    line_obj1.set_ydata(y_s)\n",
    "    line_obj2.set_xdata(t[:i])\n",
    "    line_obj2.set_ydata(f_t[:i])\n",
    "    ax1.set_title(str(i))\n",
    "    fig.canvas.draw()\n",
    "    plt.pause(0.001)\n",
    "\n",
    "    \n"
   ]
  }
 ],
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