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這篇文章主要講解了“如何判斷目標點是否在指定地圖版塊上”，文中的講解內容簡單清晰，易于學習與理解，下面請大家跟著小編的思路慢慢深入，一起來研究和學習“如何判斷目標點是否在指定地圖版塊上”吧！
最近工作中，遇到一個渲染熱力圖的場景。在最終的技術選型中，前端使用ECharts，后臺只需要提供點的經緯度坐標即可。但是中期開發過程中存在個問題，由于數據量有限，后臺能夠獲取的原始數據只有各個省份的幾個市坐標點，這樣前端在渲染的時候，就無法做出如圖的效果。
于是后臺需要模擬坐標點的分布，根據已有的坐標點進行指定范圍、指定數量級的隨機擴散。每一個隨機點需要確保在邊境線內和陸地上。
于是場景演化成了另一個幾何問題——怎么判斷目標點在指定平面上
射線法：若從一點發出的射線穿越過平面內多邊形的點的個數為偶數，則點在多邊形外，若為奇數，則點在多邊形內。
在Java 的 java.awt.geom包下，有一個關于幾何平面的類 GeneralPath。GeneralPath類中contains()方法，當目標點在 GeneralPath 幾何平面內，則返回true,否則返回false。
于是根據國內版圖分布，把地圖版塊分成 Mainland、TaiWan、HaiNan、ChongMing四個不規則幾何平面。只需要根據每個平面的邊界點畫出對應平面圖，進行目標點判斷即可。
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 {
//定義地圖版圖
private static GeneralPath generalPathMainland, generalPathTaiWan, generalPathHaiNan, generalPathChongMing;
//初始化Mainland邊界點
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邊界點
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邊界點
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島邊界點
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 生成地圖不規則多邊形
*
* [@param](https://my.oschina.net/u/2303379) polygonPoint 邊界點集合
* [@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 判斷目標點在不在版圖內
*
* @param longitude 經度
* @param latitude 緯度
* @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);
}
}public class Test {
public static void main(String[] args) {
//北京
System.out.println("北京"+PolygonUtil.isInPolygon(116.23128, 40.22077));
//哈爾濱
System.out.println("哈爾濱"+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));
//澳門
System.out.println("澳門"+PolygonUtil.isInPolygon(113.54913, 22.19875));
//臺北
System.out.println("臺北"+PolygonUtil.isInPolygon(121.520076, 25.030724));
//東京
System.out.println("東京"+PolygonUtil.isInPolygon(139.44, 35.41));
//平壤
System.out.println("平壤"+PolygonUtil.isInPolygon(125.30, 39.0));
}
}
感謝各位的閱讀，以上就是“如何判斷目標點是否在指定地圖版塊上”的內容了，經過本文的學習后，相信大家對如何判斷目標點是否在指定地圖版塊上這一問題有了更深刻的體會，具體使用情況還需要大家實踐驗證。這里是億速云，小編將為大家推送更多相關知識點的文章，歡迎關注！
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