183 lines
4.9 KiB
Plaintext
183 lines
4.9 KiB
Plaintext
{
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"cells": [
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"from matplotlib import pyplot\n",
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"from shapely.geometry import Polygon\n",
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"from descartes.patch import PolygonPatch\n",
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"from matplotlib.patches import Circle\n",
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"\n",
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"%matplotlib inline"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"COLOR = {\n",
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" True: '#6699cc',\n",
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" False: '#ff3333'\n",
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" }\n",
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"\n",
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"def v_color(ob):\n",
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" return COLOR[ob.is_valid]\n",
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"\n",
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"def plot_coords(ax, ob):\n",
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" x, y = ob.xy\n",
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" ax.plot(x, y, 'o', color='#999999', zorder=1)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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" \n",
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"fig = pyplot.figure(1, figsize=(12,20), dpi=90)\n",
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"\n",
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"# 1: valid polygon\n",
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"ax = fig.add_subplot(121)\n",
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"\n",
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"ext = [(0, 0), (0, 2), (2, 2), (2, 0), (0, 0)]\n",
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"int = [(1, 0), (0.5, 0.5), (1, 1), (1.5, 0.5), (1, 0)][::-1]\n",
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"polygon = Polygon(ext, [int])\n",
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"\n",
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"plot_coords(ax, polygon.interiors[0])\n",
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"plot_coords(ax, polygon.exterior)\n",
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"\n",
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"patch = PolygonPatch(polygon, facecolor=v_color(polygon), edgecolor=v_color(polygon), alpha=0.5, zorder=2)\n",
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"ax.add_patch(patch)\n",
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"\n",
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"ax.set_title('a) valid')\n",
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"\n",
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"xrange = [-1, 3]\n",
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"yrange = [-1, 3]\n",
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"ax.set_xlim(*xrange)\n",
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"ax.set_xticks([-1, 0, 1, 2, 3])\n",
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"ax.set_ylim(*yrange)\n",
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"ax.set_yticks([-1, 0, 1, 2, 3])\n",
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"ax.set_aspect(1)\n",
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"\n",
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"#2: invalid self-touching ring\n",
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"ax = fig.add_subplot(122)\n",
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"ext = [(0, 0), (0, 2), (2, 2), (2, 0), (0, 0)]\n",
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"int = [(1, 0), (0, 1), (0.5, 1.5), (1.5, 0.5), (1, 0)][::-1]\n",
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"polygon = Polygon(ext, [int])\n",
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"\n",
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"plot_coords(ax, polygon.interiors[0])\n",
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"plot_coords(ax, polygon.exterior)\n",
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"\n",
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"patch = PolygonPatch(polygon, facecolor=v_color(polygon), edgecolor=v_color(polygon), alpha=0.5, zorder=2)\n",
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"ax.add_patch(patch)\n",
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"\n",
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"ax.set_title('b) invalid')\n",
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"\n",
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"xrange = [-1, 3]\n",
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"yrange = [-1, 3]\n",
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"ax.set_xlim(*xrange)\n",
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"ax.set_xticks([-1, 0, 1, 2, 3])\n",
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"ax.set_ylim(*yrange)\n",
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"ax.set_yticks([-1, 0, 1, 2, 3])\n",
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"ax.set_aspect(1)\n",
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"\n",
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"pyplot.show()\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"\n",
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"fig = pyplot.figure(1, figsize=(12,20), dpi=90)\n",
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"\n",
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"# 3: invalid polygon, ring touch along a line\n",
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"ax = fig.add_subplot(121)\n",
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"\n",
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"ext = [(0, 0), (0, 2), (2, 2), (2, 0), (0, 0)]\n",
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"int = [(0.5, 0), (1.5, 0), (1.5, 1), (0.5, 1), (0.5, 0)]\n",
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"polygon = Polygon(ext, [int])\n",
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"\n",
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"plot_coords(ax, polygon.interiors[0])\n",
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"plot_coords(ax, polygon.exterior)\n",
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"\n",
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"patch = PolygonPatch(polygon, facecolor=v_color(polygon), edgecolor=v_color(polygon), alpha=0.5, zorder=2)\n",
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"ax.add_patch(patch)\n",
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"\n",
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"ax.set_title('c) invalid')\n",
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"\n",
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"xrange = [-1, 3]\n",
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"yrange = [-1, 3]\n",
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"ax.set_xlim(*xrange)\n",
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"ax.set_xticks([-1, 0, 1, 2, 3])\n",
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"ax.set_ylim(*yrange)\n",
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"ax.set_yticks([-1, 0, 1, 2, 3])\n",
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"ax.set_aspect(1)\n",
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"\n",
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"#4: invalid self-touching ring\n",
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"ax = fig.add_subplot(122)\n",
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"ext = [(0, 0), (0, 2), (2, 2), (2, 0), (0, 0)]\n",
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"int_1 = [(0.5, 0.25), (1.5, 0.25), (1.5, 1.25), (0.5, 1.25), (0.5, 0.25)]\n",
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"int_2 = [(0.5, 1.25), (1, 1.25), (1, 1.75), (0.5, 1.75)]\n",
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"# int_2 = [\n",
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"polygon = Polygon(ext, [int_1, int_2])\n",
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"\n",
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"plot_coords(ax, polygon.interiors[0])\n",
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"plot_coords(ax, polygon.interiors[1])\n",
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"plot_coords(ax, polygon.exterior)\n",
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"\n",
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"patch = PolygonPatch(polygon, facecolor=v_color(polygon), edgecolor=v_color(polygon), alpha=0.5, zorder=2)\n",
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"ax.add_patch(patch)\n",
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"\n",
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"ax.set_title('d) invalid')\n",
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"\n",
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"xrange = [-1, 3]\n",
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"yrange = [-1, 3]\n",
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"ax.set_xlim(*xrange)\n",
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"ax.set_xticks([-1, 0, 1, 2, 3])\n",
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"ax.set_ylim(*yrange)\n",
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"ax.set_yticks([-1, 0, 1, 2, 3])\n",
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"ax.set_aspect(1)\n",
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"\n",
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"pyplot.show()\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.8.5"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}
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