怎么判断目标点是否在指定地图版块上

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 tcwong* @date 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 List<Point2D.Double> polygonMainland = new ArrayList<Point2D.Double>() {{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<Point2D.Double> polygonTaiWan = new ArrayList<Point2D.Double>() {{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<Point2D.Double> polygonHaiNan = new ArrayList<Point2D.Double>() {{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<Point2D.Double> polygonChongMing = new ArrayList<Point2D.Double>() {{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 polygonPoint 边界点集合* @return* @author tcwong* @date 2020/11/29*/private static GeneralPath getGeneralPath(List<Point2D.Double> 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));}
}

边境坐标数据来源：【WP7】判断GPS坐标是否在中国

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怎么判断目标点是否在指定地图版块上

场景

实现

测试 Test

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