java 利用jdk的awt.geom 判断处理geo业务应用经纬度的线段相交，点在多边形区域内问题

//两条线段是否相交，{(0,0),(2,2)} {(2,0),(1.9,1.8)}
        boolean res = Line2D.linesIntersect(0,0,2,2,2,0,1.9,1.8);
        System.out.println(res);

        //点是否在多边形内，{(0,0),(2,0),(2,2),(0,2),(0,0)} 测试点(1,1)
        GeneralPath path = new GeneralPath();
        //设定多边形起始点
        path.moveTo(0,0);

        path.lineTo(2,0);
        path.lineTo(2,2);
        path.lineTo(0,2);
        //图像完成，封闭
        path.lineTo(0,0);

        //多边形结束
        path.closePath();
        System.out.println(path.contains(1,1));