{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
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    {
     "data": {
      "text/html": [
       "<div id=\"glowscript\" class=\"glowscript\"></div>"
      ],
      "text/plain": [
       "<IPython.core.display.HTML object>"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "application/javascript": [
       "window.__context = { glowscript_container: $(\"#glowscript\").removeAttr(\"id\")}"
      ],
      "text/plain": [
       "<IPython.core.display.Javascript object>"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "application/javascript": [
       "require.undef(\"nbextensions/vpython_libraries/glow.min\");"
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       "<IPython.core.display.Javascript object>"
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     },
     "metadata": {},
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       "require.undef(\"nbextensions/vpython_libraries/glowcomm\");"
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     "metadata": {},
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    {
     "data": {
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       "require.undef(\"nbextensions/vpython_libraries/jquery-ui.custom.min\");"
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    {
     "data": {
      "application/javascript": [
       "require([\"nbextensions/vpython_libraries/glow.min\"], function(){console.log(\"GLOW LOADED\");})"
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   ],
   "source": [
    "from vpython import *\n",
    "scene = canvas() # This is needed in Jupyter notebook and lab to make programs easily rerunnable\n",
    "scene.width = scene.height = 600\n",
    "scene.background = color.white\n",
    "scene.range = 1.3\n",
    "N = 15000\n",
    "scene.title = 'A {}-element points object with random radii and colors'.format(N)\n",
    "\n",
    "run = False\n",
    "def Runbutton(b):\n",
    "    global run\n",
    "    if b.text == 'Pause':\n",
    "        run = False\n",
    "        b.text = 'Run'\n",
    "    else:\n",
    "        run = True\n",
    "        b.text = 'Pause'\n",
    "\n",
    "button(text='Run', bind=Runbutton)\n",
    "scene.append_to_caption(\"\"\"<br>Right button drag or Ctrl-drag to rotate \"camera\" to view scene.\n",
    "Middle button or Alt-drag to drag up or down to zoom in or out.\n",
    "  On a two-button mouse, middle is left + right.\n",
    "Touch screen: pinch/extend to zoom, swipe or two-finger rotate.\"\"\")\n",
    "\n",
    "p = []\n",
    "last = vec(0,0,0)\n",
    "for i in range(N):\n",
    "    next = last+0.1*vec.random()\n",
    "    while mag(next) > 1: # if next is outside the sphere, try another random value\n",
    "        next = last+0.1*vec.random()\n",
    "    p.append({'pos':next, 'radius':0.002+0.04*random(), 'color':(vec(1,1,1)+vec.random())/2})\n",
    "    last = next\n",
    "c = points(pos=p, size_units='world')\n",
    "while True:\n",
    "    rate(60)\n",
    "    if run: # Currently there isn't a way to rotate a points object, so rotate scene.forward:\n",
    "        scene.forward = scene.forward.rotate(angle=-0.005, axis=vec(0,1,0))"
   ]
  },
  {
   "cell_type": "code",
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   "source": []
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