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MySQL gis 判断某个点是否在多边形中


!!!!!!  取得点为 多边形的最小矩形里面的点。加入java进行第二次判断。

建表:

CREATE TABLE `test` (

  `id` int(11) NOT NULL AUTO_INCREMENT,

  `pnt` point DEFAULT NULL,

  `pgn` polygon DEFAULT NULL,

  PRIMARY KEY (`id`)

) ENGINE=MyISAM AUTO_INCREMENT=18 DEFAULT CHARSET=utf8;

 

插入数据:

INSERT INTO `test` VALUES (’12’, GeomFromText(‘POINT(1 1)’), null);

INSERT INTO `test` VALUES (’11’, GeomFromText(‘POINT(1 1)’), null);

INSERT INTO `test` VALUES (‘1’, GeomFromText(‘POINT(1 1)’), null);

INSERT INTO `test` VALUES (‘2’, GeomFromText(‘POINT(1 5)’), null);

INSERT INTO `test` VALUES (‘3’, GeomFromText(‘POINT(2 2)’), null);

INSERT INTO `test` VALUES (‘4’, GeomFromText(‘POINT(2 3)’), null);

INSERT INTO `test` VALUES (‘5’, GeomFromText(‘POINT(3 2)’), null);

INSERT INTO `test` VALUES (‘8’, GeomFromText(‘POINT(2 3)’), null);

INSERT INTO `test` VALUES (‘7’, GeomFromText(‘POINT(2 2)’), null);

INSERT INTO `test` VALUES (‘9’, GeomFromText(‘POINT(12 12)’), null);

INSERT INTO `test` VALUES (’10’, null, null);

INSERT INTO `test` VALUES (’13’, null, GeomFromText(‘POLYGON((0 0, 10 0, 10 10, 0 10, 0 0), (5 5, 7 5, 7 7, 5 7, 5 5))’));

INSERT INTO `test` VALUES (’14’, null, GeomFromText(‘POLYGON((0 0, 10 0, 10 10, 0 10, 0 0))’));

INSERT INTO `test` VALUES (’15’, null, GeomFromText(‘POINT(4 4)’));

INSERT INTO `test` VALUES (’16’, GeomFromText(‘POINT(4 4)’), null);

INSERT INTO `test` VALUES (’17’, GeomFromText(‘POINT(4 4)’), null);

 

 

——————————————————————————————

插入点point:

INSERT INTO test VALUE (’17’,GeomFromText(‘POINT(4 4)’),NULL);

插入点多边形:

INSERT INTO test VALUE (’14’,NULL,GeomFromText(‘POLYGON((0 0,10 0,10 10,0 10,0 0))’));

判断点在哪个多边形内:

select id from test where MBRContains(pgn, GeomFromText(‘Point(1 1)’));

 

 

Java 判断某个点是否在多边形内。

 

package com.fjxhx.business.dida.action;

import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.List;

import com.fjxhx.business.dida.model.NetgridModel;
import com.fjxhx.business.dida.model.OrderModel;
import com.fjxhx.business.system.action.BaseAction;

public class TestGis extends BaseAction{

	 /**
     * 判断当前位置是否在围栏内
     */
	
	//dlist为某个多变形的所有点
	 public boolean isInPolygon(OrderModel order,List<NetgridModel> dlist){
		 double p_x =Double.parseDouble(order.getLocationX());
		 double p_y =Double.parseDouble(order.getLocationY());
		 Point2D.Double point = new Point2D.Double(p_x, p_y);

		 List<Point2D.Double> pointList= new ArrayList<Point2D.Double>();
		 
		 for (NetgridModel enclosure : dlist){
			 double polygonPoint_x=Double.parseDouble(enclosure.getLonX());
			 double polygonPoint_y=Double.parseDouble(enclosure.getLatY());
			 Point2D.Double polygonPoint = new Point2D.Double(polygonPoint_x,polygonPoint_y);
			 pointList.add(polygonPoint);
		 }
		 TestGis test = new TestGis();
		 return test.checkWithJdkGeneralPath(point,pointList);
	 }
	 /**
	  * 返回一个点是否在一个多边形区域内
	  * @param point
	  * @param polygon
	  * @return
	  */
	private boolean checkWithJdkGeneralPath(Point2D.Double point, List<Point2D.Double> polygon) {
	       java.awt.geom.GeneralPath p = new java.awt.geom.GeneralPath();

		   Point2D.Double first = polygon.get(0);
		   p.moveTo(first.x, first.y);
		   polygon.remove(0);
		   for (Point2D.Double d : polygon) {
		      p.lineTo(d.x, d.y);
		   }

		   p.lineTo(first.x, first.y);

		   p.closePath();

		   return p.contains(point);

		}
	
	public static void main(String[] args) {
		
		/*OrderModel order=new OrderModel();
		order.setLocationX("3");
		order.setLocationY("1.5");
		
		List<NetgridModel> nlist = new ArrayList<NetgridModel>();
		NetgridModel ne =new NetgridModel();
		NetgridModel ne1 =new NetgridModel();
		NetgridModel ne2=new NetgridModel();
		NetgridModel ne3=new NetgridModel();
		
		ne.setLonX("2");
		ne.setLatY("0");
		nlist.add(0, ne);
		
		ne1.setLonX("0");
		ne1.setLatY("2");
		nlist.add(1, ne1);
		
		ne2.setLonX("2");
		ne2.setLatY("4");
		nlist.add(2, ne2);
		
		ne3.setLonX("4");
		ne3.setLatY("2");
		nlist.add(3, ne3);
		
		TestGis test = new TestGis();
		System.out.println(test.isInPolygon(order, nlist));*/
	}

}

 

转载自:https://blog.csdn.net/star77266989/article/details/84724115