Fractals tree example

Signed-off-by: martinRenou <[email protected]>

Author: martinRenou

examples/fractals_tree.ipynb

@@ -0,0 +1,187 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "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": {},
+   "outputs": [],
+   "source": [
+    "canvas = Canvas(width=800, height=600)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "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(canvas, length * r_factor, r_angle, r_factor, l_angle, l_factor)\n",
+    "\n",
+    "        canvas.restore()\n",
+    "\n",
+    "        canvas.save()\n",
+    "\n",
+    "        canvas.rotate(l_angle)\n",
+    "        recursive_draw_leaf(canvas, length * l_factor, r_angle, r_factor, l_angle, l_factor)\n",
+    "\n",
+    "        canvas.restore()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def draw_tree(canvas):\n",
+    "    with hold_canvas(canvas):\n",
+    "        canvas.save()\n",
+    "\n",
+    "        canvas.clear()\n",
+    "\n",
+    "        canvas.translate(canvas.width / 2., 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., pi / 5.)\n",
+    "        l_angle = uniform(-pi / 5., -pi / 10.)\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",
+    "def click_callback(*args, **kwargs):\n",
+    "    global canvas\n",
+    "\n",
+    "    draw_tree(canvas)\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)"
+   ]
+  },
+  {
+   "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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+   "number_sections": true,
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+   "title_cell": "Table of Contents",
+   "title_sidebar": "Contents",
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