matplotlibを使ってJupyterLab上で動く3Dグラフを作成する

Moving_graph_with_matplotlib.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 1. Import"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "%matplotlib widget\n",
    "import matplotlib.pyplot as plt\n",
    "from mpl_toolkits.mplot3d import Axes3D\n",
    "from matplotlib.widgets import Slider\n",
    "import numpy as np"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 2. 表示するデータを作成（例として$z=x^2+2 y^2$を表示） "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [],
   "source": [
    "x = y = np.arange(-20, 20, 0.5)\n",
    "X, Y = np.meshgrid(x, y)\n",
    "Z = X*X + 2 * Y*Y"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 3. グラフを表示"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "010e0fd6100046d7943756d2b6b2f8a1",
       "version_major": 2,
       "version_minor": 0
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      "text/plain": [
       "Canvas(toolbar=Toolbar(toolitems=[('Home', 'Reset original view', 'home', 'home'), ('Back', 'Back to previous …"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "# Figureの設定\n",
    "fig = plt.figure(figsize=(5,5))\n",
    "\n",
    "# Figureの中に３Dグラフ、Slider用のAxesを追加\n",
    "axcolor = 'gold'\n",
    "gs = fig.add_gridspec(20, 20)\n",
    "ax1 = fig.add_subplot(gs[:17,:], projection='3d')\n",
    "ax_slider_z = fig.add_subplot(gs[18,:], facecolor=axcolor)\n",
    "ax_slider_xy = fig.add_subplot(gs[19,:], facecolor=axcolor)\n",
    "\n",
    "# Sliderの設定\n",
    "z0 = 0\n",
    "xy0 = 0\n",
    "delta = 10\n",
    "slider_z = Slider(ax_slider_z, 'z-axis', -180, 180, valinit=z0, valstep=delta)\n",
    "slider_xy = Slider(ax_slider_xy, 'xy-axis', -180, 180, valinit=xy0, valstep=delta)\n",
    "\n",
    "# 3Dグラフの見る方向の初期値を設定\n",
    "ax1.view_init(elev=z0, azim=xy0)\n",
    "\n",
    "# 3Dグラフを表示\n",
    "ax1.plot_surface(X, Y, Z)\n",
    "\n",
    "# Sliderを動かした時に呼ばれるコールバック関数\n",
    "def view_change(val):\n",
    "\n",
    "    sz = slider_z.val\n",
    "    sxy = slider_xy.val\n",
    "    ax1.view_init(elev=sxy, azim=sz)\n",
    "    fig.canvas.draw_idle()    \n",
    "\n",
    "slider_z.on_changed(view_change)\n",
    "slider_xy.on_changed(view_change)\n",
    "\n",
    "plt.show()"
   ]
  }
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