examples/fractals_tree.ipynb

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   "source": [
    "from math import pi\n",
    "from random import uniform\n",
    "\n",
    "from ipywidgets import Button\n",
    "\n",
    "from ipycanvas import Canvas, hold_canvas"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
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   "source": [
    "canvas = Canvas(width=800, height=600)"
   ]
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    "def recursive_draw_leaf(canvas, length, r_angle, r_factor, l_angle, l_factor):\n",
    "    canvas.stroke_line(0, 0, 0, -length)\n",
    "    canvas.translate(0, -length)\n",
    "\n",
    "    if length > 5:\n",
    "        canvas.save()\n",
    "\n",
    "        canvas.rotate(r_angle)\n",
    "        recursive_draw_leaf(\n",
    "            canvas, length * r_factor, r_angle, r_factor, l_angle, l_factor\n",
    "        )\n",
    "\n",
    "        canvas.restore()\n",
    "\n",
    "        canvas.save()\n",
    "\n",
    "        canvas.rotate(l_angle)\n",
    "        recursive_draw_leaf(\n",
    "            canvas, length * l_factor, r_angle, r_factor, l_angle, l_factor\n",
    "        )\n",
    "\n",
    "        canvas.restore()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def draw_tree(canvas):\n",
    "    with hold_canvas():\n",
    "        canvas.save()\n",
    "\n",
    "        canvas.clear()\n",
    "\n",
    "        canvas.translate(canvas.width / 2.0, canvas.height)\n",
    "\n",
    "        canvas.stroke_style = \"black\"\n",
    "\n",
    "        r_factor = uniform(0.6, 0.8)\n",
    "        l_factor = uniform(0.6, 0.8)\n",
    "\n",
    "        r_angle = uniform(pi / 10.0, pi / 5.0)\n",
    "        l_angle = uniform(-pi / 5.0, -pi / 10.0)\n",
    "\n",
    "        recursive_draw_leaf(canvas, 150, r_angle, r_factor, l_angle, l_factor)\n",
    "\n",
    "        canvas.restore()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "button = Button(description=\"Generate tree!\")\n",
    "\n",
    "\n",
    "def click_callback(*args, **kwargs):\n",
    "    global canvas\n",
    "\n",
    "    draw_tree(canvas)\n",
    "\n",
    "\n",
    "button.on_click(click_callback)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "draw_tree(canvas)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "display(canvas)\n",
    "display(button)"
   ]
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Acknowledgment:\n",
    "\n",
    "This Notebook is adapted from a Notebook by [Eric MADEC](https://github.com/ericecmorlaix) which was itself adapted from https://medium.com/better-programming/learning-p5-js-by-making-fractals-cbdcac5c651e"
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