如何判断目标点是否在指定地图版块上
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场景
最近工作中,遇到一个渲染热力图的场景。在最终的技术选型中,前端使用ECharts,后台只需要提供点的经纬度坐标即可。但是中期开发过程中存在个问题,由于数据量有限,后台能够获取的原始数据只有各个省份的几个市坐标点,这样前端在渲染的时候,就无法做出如图的效果。
于是后台需要模拟坐标点的分布,根据已有的坐标点进行指定范围、指定数量级的随机扩散。每一个随机点需要确保在边境线内和陆地上。
于是场景演化成了另一个几何问题——怎么判断目标点在指定平面上
射线法:若从一点发出的射线穿越过平面内多边形的点的个数为偶数,则点在多边形外,若为奇数,则点在多边形内。
在Java 的 java.awt.geom包下,有一个关于几何平面的类 GeneralPath。GeneralPath类中contains()方法,当目标点在 GeneralPath 几何平面内,则返回true,否则返回false。
于是根据国内版图分布,把地图版块分成 Mainland、TaiWan、HaiNan、ChongMing四个不规则几何平面。只需要根据每个平面的边界点画出对应平面图,进行目标点判断即可。
实现
package com.tcwong.pattern.Test; import java.awt.geom.GeneralPath; import java.awt.geom.Point2D; import java.util.ArrayList; import java.util.List; /** * Description * * [@author](https://my.oschina.net/arthor) tcwong * [@date](https://my.oschina.net/u/2504391) 2020/11/29 * Since 1.8 */ public class PolygonUtil { //定义地图版图 private static GeneralPath generalPathMainland, generalPathTaiWan, generalPathHaiNan, generalPathChongMing; //初始化Mainland边界点 private static ListpolygonMainland = new ArrayList () {{ add(new Point2D.Double(27.32083, 88.91693)); add(new Point2D.Double(27.54243, 88.76464)); add(new Point2D.Double(28.00805, 88.83575)); add(new Point2D.Double(28.1168, 88.62435)); add(new Point2D.Double(27.86605, 88.14279)); add(new Point2D.Double(27.82305, 87.19275)); add(new Point2D.Double(28.11166, 86.69527)); add(new Point2D.Double(27.90888, 86.45137)); add(new Point2D.Double(28.15805, 86.19769)); add(new Point2D.Double(27.88625, 86.0054)); add(new Point2D.Double(28.27916, 85.72137)); add(new Point2D.Double(28.30666, 85.11095)); add(new Point2D.Double(28.59104, 85.19518)); add(new Point2D.Double(28.54444, 84.84665)); add(new Point2D.Double(28.73402, 84.48623)); add(new Point2D.Double(29.26097, 84.11651)); add(new Point2D.Double(29.18902, 83.5479)); add(new Point2D.Double(29.63166, 83.19109)); add(new Point2D.Double(30.06923, 82.17525)); add(new Point2D.Double(30.33444, 82.11123)); add(new Point2D.Double(30.385, 81.42623)); add(new Point2D.Double(30.01194, 81.23221)); add(new Point2D.Double(30.20435, 81.02536)); add(new Point2D.Double(30.57552, 80.207)); add(new Point2D.Double(30.73374, 80.25423)); add(new Point2D.Double(30.96583, 79.86304)); add(new Point2D.Double(30.95708, 79.55429)); add(new Point2D.Double(31.43729, 79.08082)); add(new Point2D.Double(31.30895, 78.76825)); add(new Point2D.Double(31.96847, 78.77075)); add(new Point2D.Double(32.24304, 78.47594)); add(new Point2D.Double(32.5561, 78.40595)); add(new Point2D.Double(32.63902, 78.74623)); add(new Point2D.Double(32.35083, 78.9711)); add(new Point2D.Double(32.75666, 79.52874)); add(new Point2D.Double(33.09944, 79.37511)); add(new Point2D.Double(33.42863, 78.93623)); add(new Point2D.Double(33.52041, 78.81387)); add(new Point2D.Double(34.06833, 78.73581)); add(new Point2D.Double(34.35001, 78.98535)); add(new Point2D.Double(34.6118, 78.33707)); add(new Point2D.Double(35.28069, 78.02305)); add(new Point2D.Double(35.49902, 78.0718)); add(new Point2D.Double(35.50133, 77.82393)); add(new Point2D.Double(35.6125, 76.89526)); add(new Point2D.Double(35.90665, 76.55304)); add(new Point2D.Double(35.81458, 76.18061)); add(new Point2D.Double(36.07082, 75.92887)); add(new Point2D.Double(36.23751, 76.04166)); add(new Point2D.Double(36.66343, 75.85984)); add(new Point2D.Double(36.73169, 75.45179)); add(new Point2D.Double(36.91156, 75.39902)); add(new Point2D.Double(36.99719, 75.14787)); add(new Point2D.Double(37.02782, 74.56543)); add(new Point2D.Double(37.17, 74.39089)); add(new Point2D.Double(37.23733, 74.91574)); add(new Point2D.Double(37.40659, 75.18748)); add(new Point2D.Double(37.65243, 74.9036)); add(new Point2D.Double(38.47256, 74.85442)); add(new Point2D.Double(38.67438, 74.35471)); add(new Point2D.Double(38.61271, 73.81401)); add(new Point2D.Double(38.88653, 73.70818)); add(new Point2D.Double(38.97256, 73.85235)); add(new Point2D.Double(39.23569, 73.62005)); add(new Point2D.Double(39.45483, 73.65569)); add(new Point2D.Double(39.59965, 73.95471)); add(new Point2D.Double(39.76896, 73.8429)); add(new Point2D.Double(40.04202, 73.99096)); add(new Point2D.Double(40.32792, 74.88089)); add(new Point2D.Double(40.51723, 74.8588)); add(new Point2D.Double(40.45042, 75.23394)); add(new Point2D.Double(40.64452, 75.58284)); add(new Point2D.Double(40.298, 75.70374)); add(new Point2D.Double(40.35324, 76.3344)); add(new Point2D.Double(41.01258, 76.87067)); add(new Point2D.Double(41.04079, 78.08083)); add(new Point2D.Double(41.39286, 78.39554)); add(new Point2D.Double(42.03954, 80.24513)); add(new Point2D.Double(42.19622, 80.23402)); add(new Point2D.Double(42.63245, 80.15804)); add(new Point2D.Double(42.81565, 80.25796)); add(new Point2D.Double(42.88545, 80.57226)); add(new Point2D.Double(43.02906, 80.38405)); add(new Point2D.Double(43.1683, 80.81526)); add(new Point2D.Double(44.11378, 80.36887)); add(new Point2D.Double(44.6358, 80.38499)); add(new Point2D.Double(44.73408, 80.51589)); add(new Point2D.Double(44.90282, 79.87106)); add(new Point2D.Double(45.3497, 81.67928)); add(new Point2D.Double(45.15748, 81.94803)); add(new Point2D.Double(45.13303, 82.56638)); add(new Point2D.Double(45.43581, 82.64624)); add(new Point2D.Double(45.5831, 82.32179)); add(new Point2D.Double(47.20061, 83.03443)); add(new Point2D.Double(46.97332, 83.93026)); add(new Point2D.Double(46.99361, 84.67804)); add(new Point2D.Double(46.8277, 84.80318)); add(new Point2D.Double(47.0591, 85.52257)); add(new Point2D.Double(47.26221, 85.70139)); add(new Point2D.Double(47.93721, 85.53707)); add(new Point2D.Double(48.39333, 85.76596)); add(new Point2D.Double(48.54277, 86.59791)); add(new Point2D.Double(49.1102, 86.87602)); add(new Point2D.Double(49.09262, 87.34821)); add(new Point2D.Double(49.17295, 87.8407)); add(new Point2D.Double(48.98304, 87.89291)); add(new Point2D.Double(48.88103, 87.7611)); add(new Point2D.Double(48.73499, 88.05942)); add(new Point2D.Double(48.56541, 87.99194)); add(new Point2D.Double(48.40582, 88.51679)); add(new Point2D.Double(48.21193, 88.61179)); add(new Point2D.Double(47.99374, 89.08514)); add(new Point2D.Double(47.88791, 90.07096)); add(new Point2D.Double(46.95221, 90.9136)); add(new Point2D.Double(46.57735, 91.07027)); add(new Point2D.Double(46.29694, 90.92151)); add(new Point2D.Double(46.01735, 91.02651)); add(new Point2D.Double(45.57972, 90.68193)); add(new Point2D.Double(45.25305, 90.89694)); add(new Point2D.Double(45.07729, 91.56088)); add(new Point2D.Double(44.95721, 93.5547)); add(new Point2D.Double(44.35499, 94.71735)); add(new Point2D.Double(44.29416, 95.41061)); add(new Point2D.Double(44.01937, 95.34109)); add(new Point2D.Double(43.99311, 95.53339)); add(new Point2D.Double(43.28388, 95.87901)); add(new Point2D.Double(42.73499, 96.38206)); add(new Point2D.Double(42.79583, 97.1654)); add(new Point2D.Double(42.57194, 99.51012)); add(new Point2D.Double(42.67707, 100.8425)); add(new Point2D.Double(42.50972, 101.8147)); add(new Point2D.Double(42.23333, 102.0772)); add(new Point2D.Double(41.88721, 103.4164)); add(new Point2D.Double(41.87721, 104.5267)); add(new Point2D.Double(41.67068, 104.5237)); add(new Point2D.Double(41.58666, 105.0065)); add(new Point2D.Double(42.46624, 107.4758)); add(new Point2D.Double(42.42999, 109.3107)); add(new Point2D.Double(42.64576, 110.1064)); add(new Point2D.Double(43.31694, 110.9897)); add(new Point2D.Double(43.69221, 111.9583)); add(new Point2D.Double(44.37527, 111.4214)); add(new Point2D.Double(45.04944, 111.873)); add(new Point2D.Double(45.08055, 112.4272)); add(new Point2D.Double(44.8461, 112.853)); add(new Point2D.Double(44.74527, 113.638)); add(new Point2D.Double(45.38943, 114.5453)); add(new Point2D.Double(45.4586, 115.7019)); add(new Point2D.Double(45.72193, 116.2104)); add(new Point2D.Double(46.29583, 116.5855)); add(new Point2D.Double(46.41888, 117.3755)); add(new Point2D.Double(46.57069, 117.425)); add(new Point2D.Double(46.53645, 117.8455)); add(new Point2D.Double(46.73638, 118.3147)); add(new Point2D.Double(46.59895, 119.7068)); add(new Point2D.Double(46.71513, 119.9315)); add(new Point2D.Double(46.90221, 119.9225)); add(new Point2D.Double(47.66499, 119.125)); add(new Point2D.Double(47.99475, 118.5393)); add(new Point2D.Double(48.01125, 117.8046)); add(new Point2D.Double(47.65741, 117.3827)); add(new Point2D.Double(47.88805, 116.8747)); add(new Point2D.Double(47.87819, 116.2624)); add(new Point2D.Double(47.69186, 115.9231)); add(new Point2D.Double(47.91749, 115.5944)); add(new Point2D.Double(48.14353, 115.5491)); add(new Point2D.Double(48.25249, 115.8358)); add(new Point2D.Double(48.52055, 115.8111)); add(new Point2D.Double(49.83047, 116.7114)); add(new Point2D.Double(49.52058, 117.8747)); add(new Point2D.Double(49.92263, 118.5746)); add(new Point2D.Double(50.09631, 119.321)); add(new Point2D.Double(50.33028, 119.36)); add(new Point2D.Double(50.39027, 119.1386)); add(new Point2D.Double(51.62083, 120.0641)); add(new Point2D.Double(52.115, 120.7767)); add(new Point2D.Double(52.34423, 120.6259)); add(new Point2D.Double(52.54267, 120.7122)); add(new Point2D.Double(52.58805, 120.0819)); add(new Point2D.Double(52.76819, 120.0314)); add(new Point2D.Double(53.26374, 120.8307)); add(new Point2D.Double(53.54361, 123.6147)); add(new Point2D.Double(53.18832, 124.4933)); add(new Point2D.Double(53.05027, 125.62)); add(new Point2D.Double(52.8752, 125.6573)); add(new Point2D.Double(52.75722, 126.0968)); add(new Point2D.Double(52.5761, 125.9943)); add(new Point2D.Double(52.12694, 126.555)); add(new Point2D.Double(51.99437, 126.4412)); add(new Point2D.Double(51.38138, 126.9139)); add(new Point2D.Double(51.26555, 126.8176)); add(new Point2D.Double(51.31923, 126.9689)); add(new Point2D.Double(51.05825, 126.9331)); add(new Point2D.Double(50.74138, 127.2919)); add(new Point2D.Double(50.31472, 127.334)); add(new Point2D.Double(50.20856, 127.5861)); add(new Point2D.Double(49.80588, 127.515)); add(new Point2D.Double(49.58665, 127.838)); add(new Point2D.Double(49.58443, 128.7119)); add(new Point2D.Double(49.34676, 129.1118)); add(new Point2D.Double(49.4158, 129.4902)); add(new Point2D.Double(48.86464, 130.2246)); add(new Point2D.Double(48.86041, 130.674)); add(new Point2D.Double(48.60576, 130.5236)); add(new Point2D.Double(48.3268, 130.824)); add(new Point2D.Double(48.10839, 130.6598)); add(new Point2D.Double(47.68721, 130.9922)); add(new Point2D.Double(47.71027, 132.5211)); add(new Point2D.Double(48.09888, 133.0827)); add(new Point2D.Double(48.06888, 133.4843)); add(new Point2D.Double(48.39112, 134.4153)); add(new Point2D.Double(48.26713, 134.7408)); add(new Point2D.Double(47.99207, 134.5576)); add(new Point2D.Double(47.70027, 134.7608)); add(new Point2D.Double(47.32333, 134.1825)); add(new Point2D.Double(46.64017, 133.9977)); add(new Point2D.Double(46.47888, 133.8472)); add(new Point2D.Double(46.25363, 133.9016)); add(new Point2D.Double(45.82347, 133.4761)); add(new Point2D.Double(45.62458, 133.4702)); add(new Point2D.Double(45.45083, 133.1491)); add(new Point2D.Double(45.05694, 133.0253)); add(new Point2D.Double(45.34582, 131.8684)); add(new Point2D.Double(44.97388, 131.4691)); add(new Point2D.Double(44.83649, 130.953)); add(new Point2D.Double(44.05193, 131.298)); add(new Point2D.Double(43.53624, 131.1912)); add(new Point2D.Double(43.38958, 131.3104)); add(new Point2D.Double(42.91645, 131.1285)); add(new Point2D.Double(42.74485, 130.4327)); add(new Point2D.Double(42.42186, 130.6044)); add(new Point2D.Double(42.71416, 130.2468)); add(new Point2D.Double(42.88794, 130.2514)); add(new Point2D.Double(43.00457, 129.9046)); add(new Point2D.Double(42.43582, 129.6955)); add(new Point2D.Double(42.44624, 129.3493)); add(new Point2D.Double(42.02736, 128.9269)); add(new Point2D.Double(42.00124, 128.0566)); add(new Point2D.Double(41.58284, 128.3002)); add(new Point2D.Double(41.38124, 128.1529)); add(new Point2D.Double(41.47249, 127.2708)); add(new Point2D.Double(41.79222, 126.9047)); add(new Point2D.Double(41.61176, 126.5661)); add(new Point2D.Double(40.89694, 126.0118)); add(new Point2D.Double(40.47037, 124.8851)); add(new Point2D.Double(40.09362, 124.3736)); add(new Point2D.Double(39.82777, 124.128)); add(new Point2D.Double(39.8143, 123.2422)); add(new Point2D.Double(39.67388, 123.2167)); add(new Point2D.Double(38.99638, 121.648)); add(new Point2D.Double(38.8611, 121.6982)); add(new Point2D.Double(38.71909, 121.1873)); add(new Point2D.Double(38.91221, 121.0887)); add(new Point2D.Double(39.09013, 121.6794)); add(new Point2D.Double(39.2186, 121.5994)); add(new Point2D.Double(39.35166, 121.7511)); add(new Point2D.Double(39.52847, 121.2283)); add(new Point2D.Double(39.62322, 121.533)); add(new Point2D.Double(39.81138, 121.4683)); add(new Point2D.Double(40.00305, 121.881)); add(new Point2D.Double(40.50562, 122.2987)); add(new Point2D.Double(40.73874, 122.0521)); add(new Point2D.Double(40.92194, 121.1775)); add(new Point2D.Double(40.1961, 120.4468)); add(new Point2D.Double(39.87242, 119.5264)); add(new Point2D.Double(39.15693, 118.9715)); add(new Point2D.Double(39.04083, 118.3273)); add(new Point2D.Double(39.19846, 117.889)); add(new Point2D.Double(38.67555, 117.5364)); add(new Point2D.Double(38.38666, 117.6722)); add(new Point2D.Double(38.16721, 118.0281)); add(new Point2D.Double(38.1529, 118.8378)); add(new Point2D.Double(37.87832, 119.0355)); add(new Point2D.Double(37.30054, 118.9566)); add(new Point2D.Double(37.14361, 119.2328)); add(new Point2D.Double(37.15138, 119.7672)); add(new Point2D.Double(37.35228, 119.8529)); add(new Point2D.Double(37.83499, 120.7371)); add(new Point2D.Double(37.42458, 121.58)); add(new Point2D.Double(37.55256, 122.1282)); add(new Point2D.Double(37.41833, 122.1814)); add(new Point2D.Double(37.39624, 122.5586)); add(new Point2D.Double(37.20999, 122.5972)); add(new Point2D.Double(37.02583, 122.4005)); add(new Point2D.Double(37.01978, 122.5392)); add(new Point2D.Double(36.89361, 122.5047)); add(new Point2D.Double(36.84298, 122.1923)); add(new Point2D.Double(37.00027, 121.9566)); add(new Point2D.Double(36.75889, 121.5944)); add(new Point2D.Double(36.61666, 120.7764)); add(new Point2D.Double(36.52638, 120.96)); add(new Point2D.Double(36.37582, 120.8753)); add(new Point2D.Double(36.42277, 120.7062)); add(new Point2D.Double(36.14075, 120.6956)); add(new Point2D.Double(36.0419, 120.3436)); add(new Point2D.Double(36.26345, 120.3078)); add(new Point2D.Double(36.19998, 120.0889)); add(new Point2D.Double(35.95943, 120.2378)); add(new Point2D.Double(35.57893, 119.6475)); add(new Point2D.Double(34.88499, 119.1761)); add(new Point2D.Double(34.31145, 120.2487)); add(new Point2D.Double(32.97499, 120.8858)); add(new Point2D.Double(32.63889, 120.8375)); add(new Point2D.Double(32.42958, 121.3348)); add(new Point2D.Double(32.11333, 121.4412)); add(new Point2D.Double(32.02166, 121.7066)); add(new Point2D.Double(31.67833, 121.8275)); add(new Point2D.Double(31.86639, 120.9444)); add(new Point2D.Double(32.09361, 120.6019)); add(new Point2D.Double(31.94555, 120.099)); add(new Point2D.Double(32.30638, 119.8267)); add(new Point2D.Double(32.26277, 119.6317)); add(new Point2D.Double(31.90388, 120.1364)); add(new Point2D.Double(31.98833, 120.7026)); add(new Point2D.Double(31.81944, 120.7196)); add(new Point2D.Double(31.30889, 121.6681)); add(new Point2D.Double(30.97986, 121.8828)); add(new Point2D.Double(30.85305, 121.8469)); add(new Point2D.Double(30.56889, 120.9915)); add(new Point2D.Double(30.33555, 120.8144)); add(new Point2D.Double(30.39298, 120.4586)); add(new Point2D.Double(30.19694, 120.15)); add(new Point2D.Double(30.31027, 120.5082)); add(new Point2D.Double(30.06465, 120.7916)); add(new Point2D.Double(30.30458, 121.2808)); add(new Point2D.Double(29.96305, 121.6778)); add(new Point2D.Double(29.88211, 122.1196)); add(new Point2D.Double(29.51167, 121.4483)); add(new Point2D.Double(29.58916, 121.9744)); add(new Point2D.Double(29.19527, 121.9336)); add(new Point2D.Double(29.18388, 121.8119)); add(new Point2D.Double(29.37236, 121.7969)); add(new Point2D.Double(29.19729, 121.7444)); add(new Point2D.Double(29.29111, 121.5611)); add(new Point2D.Double(29.1634, 121.4135)); add(new Point2D.Double(29.02194, 121.6914)); add(new Point2D.Double(28.9359, 121.4908)); add(new Point2D.Double(28.72798, 121.6113)); add(new Point2D.Double(28.84215, 121.1464)); add(new Point2D.Double(28.66993, 121.4844)); add(new Point2D.Double(28.34722, 121.6417)); add(new Point2D.Double(28.13889, 121.3419)); add(new Point2D.Double(28.38277, 121.1651)); add(new Point2D.Double(27.98222, 120.9353)); add(new Point2D.Double(28.07944, 120.5908)); add(new Point2D.Double(27.87229, 120.84)); add(new Point2D.Double(27.59319, 120.5812)); add(new Point2D.Double(27.45083, 120.6655)); add(new Point2D.Double(27.20777, 120.5075)); add(new Point2D.Double(27.28278, 120.1896)); add(new Point2D.Double(27.14764, 120.4211)); add(new Point2D.Double(26.89805, 120.0332)); add(new Point2D.Double(26.64465, 120.128)); add(new Point2D.Double(26.51778, 119.8603)); add(new Point2D.Double(26.78823, 120.0733)); add(new Point2D.Double(26.64888, 119.8668)); add(new Point2D.Double(26.79611, 119.7879)); add(new Point2D.Double(26.75625, 119.5503)); add(new Point2D.Double(26.44222, 119.8204)); add(new Point2D.Double(26.47388, 119.5775)); add(new Point2D.Double(26.33861, 119.658)); add(new Point2D.Double(26.36777, 119.9489)); add(new Point2D.Double(25.99694, 119.4253)); add(new Point2D.Double(26.14041, 119.0975)); add(new Point2D.Double(25.93788, 119.354)); add(new Point2D.Double(25.99069, 119.7058)); add(new Point2D.Double(25.67996, 119.5807)); add(new Point2D.Double(25.68222, 119.4522)); add(new Point2D.Double(25.35333, 119.6454)); add(new Point2D.Double(25.60649, 119.3149)); add(new Point2D.Double(25.42097, 119.1053)); add(new Point2D.Double(25.25319, 119.3526)); add(new Point2D.Double(25.17208, 119.2726)); add(new Point2D.Double(25.2426, 118.8749)); add(new Point2D.Double(24.97194, 118.9866)); add(new Point2D.Double(24.88291, 118.5729)); add(new Point2D.Double(24.75673, 118.7631)); add(new Point2D.Double(24.52861, 118.5953)); add(new Point2D.Double(24.53638, 118.2397)); add(new Point2D.Double(24.68194, 118.1688)); add(new Point2D.Double(24.44024, 118.0199)); add(new Point2D.Double(24.46019, 117.7947)); add(new Point2D.Double(24.25875, 118.1237)); add(new Point2D.Double(23.62437, 117.1957)); add(new Point2D.Double(23.65919, 116.9179)); add(new Point2D.Double(23.355, 116.7603)); add(new Point2D.Double(23.42024, 116.5322)); add(new Point2D.Double(23.23666, 116.7871)); add(new Point2D.Double(23.21083, 116.5139)); add(new Point2D.Double(22.93902, 116.4817)); add(new Point2D.Double(22.73916, 115.7978)); add(new Point2D.Double(22.88416, 115.6403)); add(new Point2D.Double(22.65889, 115.5367)); add(new Point2D.Double(22.80833, 115.1614)); add(new Point2D.Double(22.70277, 114.8889)); add(new Point2D.Double(22.53305, 114.8722)); add(new Point2D.Double(22.64027, 114.718)); add(new Point2D.Double(22.81402, 114.7782)); add(new Point2D.Double(22.69972, 114.5208)); add(new Point2D.Double(22.50423, 114.6136)); add(new Point2D.Double(22.55004, 114.2223)); add(new Point2D.Double(22.42993, 114.3885)); add(new Point2D.Double(22.26056, 114.2961)); add(new Point2D.Double(22.36736, 113.9056)); add(new Point2D.Double(22.50874, 114.0337)); add(new Point2D.Double(22.47444, 113.8608)); add(new Point2D.Double(22.83458, 113.606)); add(new Point2D.Double(23.05027, 113.5253)); add(new Point2D.Double(23.11724, 113.8219)); add(new Point2D.Double(23.05083, 113.4793)); add(new Point2D.Double(22.87986, 113.3629)); add(new Point2D.Double(22.54944, 113.5648)); add(new Point2D.Double(22.18701, 113.5527)); add(new Point2D.Double(22.56701, 113.1687)); add(new Point2D.Double(22.17965, 113.3868)); add(new Point2D.Double(22.04069, 113.2226)); add(new Point2D.Double(22.20485, 113.0848)); add(new Point2D.Double(21.8693, 112.94)); add(new Point2D.Double(21.96472, 112.824)); add(new Point2D.Double(21.70139, 112.2819)); add(new Point2D.Double(21.91611, 111.8921)); add(new Point2D.Double(21.75139, 111.9669)); add(new Point2D.Double(21.77819, 111.6762)); add(new Point2D.Double(21.61264, 111.7832)); add(new Point2D.Double(21.5268, 111.644)); add(new Point2D.Double(21.52528, 111.0285)); add(new Point2D.Double(21.21138, 110.5328)); add(new Point2D.Double(21.37322, 110.3944)); add(new Point2D.Double(20.84381, 110.1594)); add(new Point2D.Double(20.84083, 110.3755)); add(new Point2D.Double(20.64, 110.3239)); add(new Point2D.Double(20.48618, 110.5274)); add(new Point2D.Double(20.24611, 110.2789)); add(new Point2D.Double(20.2336, 109.9244)); add(new Point2D.Double(20.4318, 110.0069)); add(new Point2D.Double(20.92416, 109.6629)); add(new Point2D.Double(21.44694, 109.9411)); add(new Point2D.Double(21.50569, 109.6605)); add(new Point2D.Double(21.72333, 109.5733)); add(new Point2D.Double(21.49499, 109.5344)); add(new Point2D.Double(21.39666, 109.1428)); add(new Point2D.Double(21.58305, 109.1375)); add(new Point2D.Double(21.61611, 108.911)); add(new Point2D.Double(21.79889, 108.8702)); add(new Point2D.Double(21.59888, 108.7403)); add(new Point2D.Double(21.93562, 108.4692)); add(new Point2D.Double(21.59014, 108.5125)); add(new Point2D.Double(21.68999, 108.3336)); add(new Point2D.Double(21.51444, 108.2447)); add(new Point2D.Double(21.54241, 107.99)); add(new Point2D.Double(21.66694, 107.7831)); add(new Point2D.Double(21.60526, 107.3627)); add(new Point2D.Double(22.03083, 106.6933)); add(new Point2D.Double(22.45682, 106.5517)); add(new Point2D.Double(22.76389, 106.7875)); add(new Point2D.Double(22.86694, 106.7029)); add(new Point2D.Double(22.91253, 105.8771)); add(new Point2D.Double(23.32416, 105.3587)); add(new Point2D.Double(23.18027, 104.9075)); add(new Point2D.Double(22.81805, 104.7319)); add(new Point2D.Double(22.6875, 104.3747)); add(new Point2D.Double(22.79812, 104.1113)); add(new Point2D.Double(22.50387, 103.9687)); add(new Point2D.Double(22.78287, 103.6538)); add(new Point2D.Double(22.58436, 103.5224)); add(new Point2D.Double(22.79451, 103.3337)); add(new Point2D.Double(22.43652, 103.0304)); add(new Point2D.Double(22.77187, 102.4744)); add(new Point2D.Double(22.39629, 102.1407)); add(new Point2D.Double(22.49777, 101.7415)); add(new Point2D.Double(22.20916, 101.5744)); add(new Point2D.Double(21.83444, 101.7653)); add(new Point2D.Double(21.14451, 101.786)); add(new Point2D.Double(21.17687, 101.2919)); add(new Point2D.Double(21.57264, 101.1482)); add(new Point2D.Double(21.76903, 101.099)); add(new Point2D.Double(21.47694, 100.6397)); add(new Point2D.Double(21.43546, 100.2057)); add(new Point2D.Double(21.72555, 99.97763)); add(new Point2D.Double(22.05018, 99.95741)); add(new Point2D.Double(22.15592, 99.16785)); add(new Point2D.Double(22.93659, 99.56484)); add(new Point2D.Double(23.08204, 99.5113)); add(new Point2D.Double(23.18916, 98.92747)); add(new Point2D.Double(23.97076, 98.67991)); add(new Point2D.Double(24.16007, 98.89073)); add(new Point2D.Double(23.92999, 97.54762)); add(new Point2D.Double(24.26055, 97.7593)); add(new Point2D.Double(24.47666, 97.54305)); add(new Point2D.Double(24.73992, 97.55255)); add(new Point2D.Double(25.61527, 98.19109)); add(new Point2D.Double(25.56944, 98.36137)); add(new Point2D.Double(25.85597, 98.7104)); add(new Point2D.Double(26.12527, 98.56944)); add(new Point2D.Double(26.18472, 98.73109)); add(new Point2D.Double(26.79166, 98.77777)); add(new Point2D.Double(27.52972, 98.69699)); add(new Point2D.Double(27.6725, 98.45888)); add(new Point2D.Double(27.54014, 98.31992)); add(new Point2D.Double(28.14889, 98.14499)); add(new Point2D.Double(28.54652, 97.55887)); add(new Point2D.Double(28.22277, 97.34888)); add(new Point2D.Double(28.46749, 96.65387)); add(new Point2D.Double(28.35111, 96.40193)); add(new Point2D.Double(28.525, 96.34027)); add(new Point2D.Double(28.79569, 96.61373)); add(new Point2D.Double(29.05666, 96.47083)); add(new Point2D.Double(28.90138, 96.17532)); add(new Point2D.Double(29.05972, 96.14888)); add(new Point2D.Double(29.25757, 96.39172)); add(new Point2D.Double(29.46444, 96.08315)); add(new Point2D.Double(29.03527, 95.38777)); add(new Point2D.Double(29.33346, 94.64751)); add(new Point2D.Double(29.07348, 94.23456)); add(new Point2D.Double(28.6692, 93.96172)); add(new Point2D.Double(28.61876, 93.35194)); add(new Point2D.Double(28.3193, 93.22205)); add(new Point2D.Double(28.1419, 92.71044)); add(new Point2D.Double(27.86194, 92.54498)); add(new Point2D.Double(27.76472, 91.65776)); add(new Point2D.Double(27.945, 91.66277)); add(new Point2D.Double(28.08111, 91.30138)); add(new Point2D.Double(27.96999, 91.08693)); add(new Point2D.Double(28.07958, 90.3765)); add(new Point2D.Double(28.24257, 90.38898)); add(new Point2D.Double(28.32369, 89.99819)); add(new Point2D.Double(28.05777, 89.48749)); add(new Point2D.Double(27.32083, 88.91693)); }}; //初始化TaiWan边界点 private static List polygonTaiWan = new ArrayList () {{ add(new Point2D.Double(25.13474, 121.4441)); add(new Point2D.Double(25.28361, 121.5632)); add(new Point2D.Double(25.00722, 122.0004)); add(new Point2D.Double(24.85028, 121.8182)); add(new Point2D.Double(24.47638, 121.8397)); add(new Point2D.Double(23.0875, 121.3556)); add(new Point2D.Double(21.92791, 120.7196)); add(new Point2D.Double(22.31277, 120.6103)); add(new Point2D.Double(22.54044, 120.3071)); add(new Point2D.Double(23.04437, 120.0539)); add(new Point2D.Double(23.61708, 120.1112)); add(new Point2D.Double(25.00166, 121.0017)); add(new Point2D.Double(25.13474, 121.4441)); }}; //初始化HaiNan边界点 private static List polygonHaiNan = new ArrayList () {{ add(new Point2D.Double(19.52888, 110.855)); add(new Point2D.Double(19.16761, 110.4832)); add(new Point2D.Double(18.80083, 110.5255)); add(new Point2D.Double(18.3852, 110.0503)); add(new Point2D.Double(18.39152, 109.7594)); add(new Point2D.Double(18.19777, 109.7036)); add(new Point2D.Double(18.50562, 108.6871)); add(new Point2D.Double(19.28028, 108.6283)); add(new Point2D.Double(19.76, 109.2939)); add(new Point2D.Double(19.7236, 109.1653)); add(new Point2D.Double(19.89972, 109.2572)); add(new Point2D.Double(19.82861, 109.4658)); add(new Point2D.Double(19.99389, 109.6108)); add(new Point2D.Double(20.13361, 110.6655)); add(new Point2D.Double(19.97861, 110.9425)); add(new Point2D.Double(19.63829, 111.0215)); add(new Point2D.Double(19.52888, 110.855)); }}; //初始化ChongMing岛边界点 private static List polygonChongMing = new ArrayList () {{ add(new Point2D.Double(31.80054, 121.2039)); add(new Point2D.Double(31.49972, 121.8736)); add(new Point2D.Double(31.53111, 121.5464)); add(new Point2D.Double(31.80054, 121.2039)); }}; static { generalPathMainland = getGeneralPath(polygonMainland); generalPathTaiWan = getGeneralPath(polygonTaiWan); generalPathHaiNan = getGeneralPath(polygonHaiNan); generalPathChongMing = getGeneralPath(polygonChongMing); } /** * Description 生成地图不规则多边形 * * [@param](https://my.oschina.net/u/2303379) polygonPoint 边界点集合 * [@return](https://my.oschina.net/u/556800) * [@author](https://my.oschina.net/arthor) tcwong * @date 2020/11/29 */ private static GeneralPath getGeneralPath(List polygonPoint) { GeneralPath generalPath = new GeneralPath(); Point2D.Double startPoint = polygonPoint.get(0); generalPath.moveTo(startPoint.getX(), startPoint.getY()); polygonPoint.remove(0); polygonPoint.forEach(point -> { generalPath.lineTo(point.getX(), point.getY()); }); generalPath.lineTo(startPoint.getX(), startPoint.getY()); generalPath.closePath(); return generalPath; } /** * Description 判断目标点在不在版图内 * * @param longitude 经度 * @param latitude 纬度 * @return * @author tcwong * @date 2020/11/29 */ public static Boolean isInPolygon(double longitude, double latitude) { Point2D.Double targetPoint = new Point2D.Double(latitude, longitude); return generalPathMainland.contains(targetPoint) || generalPathTaiWan.contains(targetPoint) || generalPathHaiNan.contains(targetPoint) || generalPathChongMing.contains(targetPoint); } }
测试 Test
public class Test { public static void main(String[] args) { //北京 System.out.println("北京"+PolygonUtil.isInPolygon(116.23128, 40.22077)); //哈尔滨 System.out.println("哈尔滨"+PolygonUtil.isInPolygon(126.95717, 45.54774)); //西安 System.out.println("西安"+PolygonUtil.isInPolygon(108.93425, 34.23053)); //南京 System.out.println("南京"+PolygonUtil.isInPolygon(118.8921, 31.32751)); //深圳 System.out.println("深圳"+PolygonUtil.isInPolygon(113.88308, 22.55329)); //澳门 System.out.println("澳门"+PolygonUtil.isInPolygon(113.54913, 22.19875)); //台北 System.out.println("台北"+PolygonUtil.isInPolygon(121.520076, 25.030724)); //东京 System.out.println("东京"+PolygonUtil.isInPolygon(139.44, 35.41)); //平壤 System.out.println("平壤"+PolygonUtil.isInPolygon(125.30, 39.0)); } }
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