feiniao-farm-h5/src/utils/WSCoordinate.js

//	计算两点之间直线距离
import WKT from "ol/format/WKT";

export const algorithm = (point1, point2) => {
  let [x1, y1] = point1;
  let [x2, y2] = point2;
  let Lat1 = rad(x1); // 纬度
  let Lat2 = rad(x2);
  let a = Lat1 - Lat2;//	两点纬度之差
  let b = rad(y1) - rad(y2); //	经度之差
  let s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2)
    + Math.cos(Lat1) * Math.cos(Lat2) * Math.pow(Math.sin(b / 2), 2)));
  //	计算两点距离的公式
  s = s * 6378137.0;//	弧长等于弧度乘地球半径（半径为米）
  s = Math.round(s * 10000) / 10000;//	精确距离的数值
  return s;

}

//	角度转换成弧度
const rad = (d) => {
  return d * Math.PI / 180.00;
};



/**
 *  判断经纬度是否超出中国境内
 */
export function isLocationOutOfChina(latitude, longitude) {
  if (longitude < 72.004 || longitude > 137.8347 || latitude < 0.8293 || latitude > 55.8271)
    return true;
  return false;
}


/**
 *  将WGS-84(国际标准)转为GCJ-02(火星坐标):
 */
export function transformFromWGSToGCJ(latitude, longitude) {
  let lat = "";
  let lon = "";
  let ee = 0.00669342162296594323;
  let a = 6378245.0;
  let pi = 3.14159265358979324;

  if (isLocationOutOfChina(latitude, longitude)) {
    lat = latitude;
    lon = longitude;
  }
  else {
    let adjustLat = transformLatWithXY(longitude - 105.0, latitude - 35.0);
    let adjustLon = transformLonWithXY(longitude - 105.0, latitude - 35.0);
    let radLat = latitude / 180.0 * pi;
    let magic = Math.sin(radLat);
    magic = 1 - ee * magic * magic;
    let sqrtMagic = Math.sqrt(magic);
    adjustLat = (adjustLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
    adjustLon = (adjustLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
    latitude = latitude + adjustLat;
    longitude = longitude + adjustLon;
  }
  return { latitude: latitude, longitude: longitude };

}

/**
 *  将GCJ-02(火星坐标)转为百度坐标:
 */
export function transformFromGCJToBaidu(latitude, longitude) {
  let pi = 3.14159265358979324 * 3000.0 / 180.0;

  let z = Math.sqrt(longitude * longitude + latitude * latitude) + 0.00002 * Math.sin(latitude * pi);
  let theta = Math.atan2(latitude, longitude) + 0.000003 * Math.cos(longitude * pi);
  let a_latitude = (z * Math.sin(theta) + 0.006);
  let a_longitude = (z * Math.cos(theta) + 0.0065);

  return { latitude: a_latitude, longitude: a_longitude };
}

/**
 *  将百度坐标转为GCJ-02(火星坐标):
 */
export function transformFromBaiduToGCJ(latitude, longitude) {
  let xPi = 3.14159265358979323846264338327950288 * 3000.0 / 180.0;

  let x = longitude - 0.0065;
  let y = latitude - 0.006;
  let z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * xPi);
  let theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * xPi);
  let a_latitude = z * Math.sin(theta);
  let a_longitude = z * Math.cos(theta);

  return { latitude: a_latitude, longitude: a_longitude };
}

/**
 *  将GCJ-02(火星坐标)转为WGS-84:
 */
export function transformFromGCJToWGS(latitude, longitude) {
  let threshold = 0.00001;

  // The boundary
  let minLat = latitude - 0.5;
  let maxLat = latitude + 0.5;
  let minLng = longitude - 0.5;
  let maxLng = longitude + 0.5;

  let delta = 1;
  let maxIteration = 30;
  let success = false
  while (success == false) {
    let leftBottom = transformFromWGSToGCJ(minLat, minLng);
    let rightBottom = transformFromWGSToGCJ(minLat, maxLng);
    let leftUp = transformFromWGSToGCJ(maxLat, minLng);
    let midPoint = transformFromWGSToGCJ((minLat + maxLat) / 2, (minLng + maxLng) / 2);
    delta = Math.abs(midPoint.latitude - latitude) + Math.abs(midPoint.longitude - longitude);

    if (maxIteration-- <= 0 || delta <= threshold) {
      return { latitude: (minLat + maxLat) / 2, longitude: (minLng + maxLng) / 2 };
    }

    if (isContains({ latitude: latitude, longitude: longitude }, leftBottom, midPoint)) {
      maxLat = (minLat + maxLat) / 2;
      maxLng = (minLng + maxLng) / 2;
    }
    else if (isContains({ latitude: latitude, longitude: longitude }, rightBottom, midPoint)) {
      maxLat = (minLat + maxLat) / 2;
      minLng = (minLng + maxLng) / 2;
    }
    else if (isContains({ latitude: latitude, longitude: longitude }, leftUp, midPoint)) {
      minLat = (minLat + maxLat) / 2;
      maxLng = (minLng + maxLng) / 2;
    }
    else {
      minLat = (minLat + maxLat) / 2;
      minLng = (minLng + maxLng) / 2;
    }
  }

}

export function toPointWkt(location) {
  let { longitude, latitude } = location
  return "POINT(" + longitude + " " + latitude + ")"
}

export function pointWktToLocation(wkt) {
  let start = wkt.indexOf("(")
  let end = wkt.indexOf(")")
  let arr = wkt.substring(start + 1, end).trim().split(" ")
  arr[0] = parseFloat(arr[0]);
  arr[1] = parseFloat(arr[1]);
  return arr
}

/**
 * 米转度
 * @returns {number}
 */
export function meterToDegree(m) {
  let degree = m / (2 * Math.PI * 6371004) * 360;
  return degree
}

export const pointToBox = (pointWkt) => {
  let location = pointWktToLocation(pointWkt)

  let d = meterToDegree(1500)
  let dd = meterToDegree(10)
  //得到左上角点
  let leftTop = [0, 0]
  leftTop[0] = location[0] - d - (dd * 15)
  leftTop[1] = location[1] + d + (dd * 2)
  //得到右上角点
  let rightTop = [0, 0]
  rightTop[0] = location[0] + d + (dd * 15)
  rightTop[1] = location[1] + d + (dd * 2)
  //得到左下角点
  let leftBottom = [0, 0]
  leftBottom[0] = location[0] - d - (dd * 15)
  leftBottom[1] = location[1] - d - (dd * 2)
  //得到右下角点
  let rightBottom = [0, 0]
  rightBottom[0] = location[0] + d + (dd * 15)
  rightBottom[1] = location[1] - d - (dd * 2)
  let wkt = `POLYGON((${leftBottom[0]} ${leftBottom[1]}, ${leftTop[0]} ${leftTop[1]}, ${rightTop[0]} ${rightTop[1]}, ${rightBottom[0]} ${rightBottom[1]}, ${leftBottom[0]} ${leftBottom[1]}))`
  return wkt
}

export function isContains(point, p1, p2) {
  return (point.latitude >= Math.min(p1.latitude, p2.latitude) && point.latitude <= Math.max(p1.latitude, p2.latitude)) && (point.longitude >= Math.min(p1.longitude, p2.longitude) && point.longitude <= Math.max(p1.longitude, p2.longitude));
}

export function transformLatWithXY(x, y) {
  let pi = 3.14159265358979324;
  let lat = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
  lat += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
  lat += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
  lat += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
  return lat;
}

export function transformLonWithXY(x, y) {
  let pi = 3.14159265358979324;
  let lon = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
  lon += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
  lon += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
  lon += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
  return lon;
}


//检查视野范围是否超过了bbox
export function checkRegion(bbox, region) {
  if (bbox.northeast.latitude < region.northeast.latitude) {
    return true;
  }
  if (bbox.northeast.longitude < region.northeast.longitude) {
    return true;
  }
  if (bbox.southwest.latitude > region.southwest.latitude) {
    return true;
  }
  if (bbox.southwest.longitude > region.southwest.longitude) {
    return true;
  }
  return false
}