using?System;
using?System.Collections.Generic;
using?System.Linq;
using?System.Text;

namespace?p
{
????class?Program
????{
????????static?void?Main（string[]?args）
????????{
????????????Point?p?=?new?Point（112.3839540000?37.9901770000）;

????????????Point[]?ps?=?new?Point[]?{?new?Point（112.4091887500?38.0200324167）?new?Point（112.4668669727?37.7316897817）?new?Point（112.6701140430?37.7686085000）?new?Point（112.6234221484?38.0070487978）?};

????????????Console.WriteLine（“x:“?+?p.X?+?“y:“?+?p.Y）;

????????????Console.WriteLine（“result:“?+?（isPtInPoly（p.X?p.Y?ps）???“yes“?:?“no“））;

????????????Console.ReadKey（）;
????????}

????????///?

????????///??判斷指定的經(jīng)緯度坐標(biāo)點(diǎn)是否落在指定的多邊形區(qū)域內(nèi)
????????///?

????????///?指定點(diǎn)的經(jīng)度
????????///?指定點(diǎn)的緯度
????????///?指定多邊形區(qū)域各個(gè)節(jié)點(diǎn)坐標(biāo)
????????///?True?落在范圍內(nèi)?False?不在范圍內(nèi)
????????public?static?bool?isPtInPoly（double?ALon?double?ALat?Point[]?APoints）
????????{
????????????int?iSum?iCount?iIndex;
????????????double?dLon1?=?0?dLon2?=?0?dLat1?=?0?dLat2?=?0?dLon;

????????????if?（APoints.Length?????????????{
????????????????return?false;
????????????}

????????????iSum?=?0;
????????????iCount?=?APoints.Length;

????????????for?（iIndex?=?0;?iIndex?????????????{
????????????????if?（iIndex?==?iCount?-?1）
????????????????{
????????????????????dLon1?=?APoints[iIndex].X;
????????????????????dLat1?=?APoints[iIndex].Y;
????????????????????dLon2?=?APoints[0].X;
????????????????????dLat2?=?APoints[0].Y;
????????????????}
????????????????else
????????????????{
????????????????????dLon1?=?APoints[iIndex].X;
????????????????????dLat1?=?APoints[iIndex].Y;
????????????????????dLon2?=?APoints[iIndex?+?1].X;
????????????????????dLat2?=?APoints[iIndex?+?1].Y;
????????????????}

????????????????if?（（（ALat?>=?dLat1）?&&?（ALat?=?dLat2）?&&?（ALat?????????????????{
????????????????????if?（Math.Abs（dLat1?-?dLat2）?>?0）
????????????????????{
????????????????????????dLon?=?dLon1?-?（（dLon1?-?dLon2）?*?（dLat1?-?ALat））?/?（dLat1?-?dLat2）;
????????????????????????if?（dLon?????????????????????????????iSum++;
????????????????????}
????????????????}
????????????}

????????????if?（（iSum?%?2）?!=?0）
????????????????return?true;
????????????return?false;
????????}
????}

????///?

????///?坐標(biāo)
????///?

????public?class?Point
????{
????????private?Double?x;
????????private?Double?y;

????????public?Point（）
????????{
????????????this.x?=?0;
????????????this.y?=?0;
????????}
????????public?Point（double?_x?double?_y）
????????{
????????????this.x?=?_x;
????????????this.y?=?_y;
????????}

????????public?Double?X
????????{
????????????get?{?return?x;?}
????????????set?{?x?=?value;?}
????????}

????????public?Double?Y
????????{
????????????get?{?return?y;?}
????????????