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。
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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 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](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<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));
}
}
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边境坐标数据来源：【WP7】判断GPS坐标是否在中国
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