From e7e3d70183c4733d06e707348be85aaa82467917 Mon Sep 17 00:00:00 2001
From: fruchti <fruchti@gvfr.de>
Date: Sun, 11 Dec 2022 16:48:54 +0100
Subject: [PATCH] Add 2D noise-based landscape plots

---
 perlin_landscape.ipynb | 114 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 perlin_landscape.ipynb

diff --git a/perlin_landscape.ipynb b/perlin_landscape.ipynb
new file mode 100644
index 0000000..55c43cc
--- /dev/null
+++ b/perlin_landscape.ipynb
@@ -0,0 +1,114 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import numpy as np\n",
+    "from lib import plot, noise\n",
+    "import IPython\n",
+    "import noise"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
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+      "text/plain": [
+       "<IPython.core.display.SVG object>"
+      ]
+     },
+     "execution_count": 10,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "paper = plot.A6_PORTRAIT\n",
+    "p_svg = plot.SVGPlotter('plots/landscape.svg', paper)\n",
+    "p_hpgl = plot.HPGLPlotter(paper, 'plots/landscape_{index}.hpgl')\n",
+    "plotter = plot.MultiPlotter()\n",
+    "plotter.register_plotter(p_svg)\n",
+    "plotter.register_plotter(p_hpgl)\n",
+    "\n",
+    "plotter.move_to(paper.bottom_left())\n",
+    "plotter.line_to(paper.bottom_right())\n",
+    "plotter.line_to(paper.top_right())\n",
+    "plotter.line_to(paper.top_left())\n",
+    "plotter.line_to(paper.bottom_left())\n",
+    "\n",
+    "centre = paper.centre()\n",
+    "\n",
+    "shape = (100, 21)\n",
+    "scale = .6\n",
+    "octaves = 6\n",
+    "persistence = 0.4\n",
+    "lacunarity = 1.8\n",
+    "seed = np.random.randint(0, 100)\n",
+    "\n",
+    "world = np.zeros(shape)\n",
+    "\n",
+    "x_idx = np.linspace(0, 1, shape[0])\n",
+    "y_idx = np.linspace(0, 1, shape[1])\n",
+    "world_x, world_y = np.meshgrid(x_idx, y_idx)\n",
+    "\n",
+    "world = np.vectorize(noise.pnoise2)(world_x / scale,\n",
+    "        world_y / scale,\n",
+    "        octaves=octaves,\n",
+    "        persistence=persistence,\n",
+    "        lacunarity=lacunarity,\n",
+    "        repeatx=1024,\n",
+    "        repeaty=1024,\n",
+    "        base=seed)\n",
+    "\n",
+    "def tf(coord):\n",
+    "    return paper.width * 0.75 * (np.array(coord) - [0.5, 0.5]) + centre\n",
+    "\n",
+    "for i in reversed(range(len(y_idx) - 1)):\n",
+    "    world[i, :] = np.min([world[i, :], world[i + 1, :] - (y_idx[0] - y_idx[1])], axis=0)\n",
+    "\n",
+    "for i, y in enumerate(y_idx):\n",
+    "    plotter.move_to(tf((0, y + world[i, 0])))\n",
+    "    for j, x in enumerate(x_idx[1:]):\n",
+    "        plotter.line_to(tf((x, y + world[i, j])))\n",
+    "\n",
+    "plotter.finalise()\n",
+    "\n",
+    "IPython.display.SVG(filename=p_svg.file_name)"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3.9.15 64-bit",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.9.15"
+  },
+  "orig_nbformat": 4,
+  "vscode": {
+   "interpreter": {
+    "hash": "1dc4d77b1edb83bef89f833b7ed5251134c6a4899ef5e2c90c44e9927b4ae63a"
+   }
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}