mini_program/utils/gitUtil.js

const isPointInPolygon = (aLat, aLon, pointList) => {
    /*
    :param aLon: double 经度
    :param aLat: double 纬度
    :param pointList: list [{latitude: 22.22, longitude: 113.113}...] 多边形点的顺序需根据顺时针或逆时针，不能乱
    */
    var iSum = 0
    var iCount = pointList.length

    if (iCount < 3) {
        return false
    }
    for (var i = 0; i < iCount; i++) {
        var pLat1 = pointList[i][1]
        var pLon1 = pointList[i][0]
        if (i == iCount - 1) {
            var pLat2 = pointList[0][1]
            var pLon2 = pointList[0][0]
        } else {
            var pLat2 = pointList[i + 1][1]
            var pLon2 = pointList[i + 1][0]
        }
        if (((aLat >= pLat1) && (aLat < pLat2)) || ((aLat >= pLat2) && (aLat < pLat1))) {
            if (Math.abs(pLat1 - pLat2) > 0) {
                var pLon = pLon1 - ((pLon1 - pLon2) * (pLat1 - aLat)) / (pLat1 - pLat2);
                if (pLon < aLon) {
                    iSum += 1
                }
            }
        }
    }
    if (iSum % 2 != 0) {
        return true
    } else {
        return false
    }
}

const setWKT = (target, data, id) => {
    let {
        polygons
    } = target.data;
    if (data.data && data.data.length > 0) {
        let newPolygons = data.data.map(item => {
            return item.polygon
        })
        target.setData({
            polygons: polygons.concat(newPolygons)
        })
    }
}
module.exports = {
    isPointInPolygon,
    setWKT
};