[C #] the use of correction data to deal with the Earth coordinate (WGS-84) and Mars coordinate (GCJ-02) conversion,

[C #] the use of correction data to deal with the Earth coordinate (WGS-84) and Mars coordinate (GCJ-02) conversion,

Key code:

Using System; using System. collections; using System. collections. generic; using System. IO; using YanZhiwei. dotNet2.Utilities. models; namespace YanZhiwei. dotNet2.Utilities. common {/// <summary> // map correction data help class // </summary> public class MapOffsetDataHelper {# region constructor and variable private string offsetFullPath = string. empty; /// <summary> /// constructor /// </summary> /// <param name = "path"> correction data file path </param> public MapOffsetDataHelper (string path) {offsetFullPath = path ;}# endregion # region private method private void GetOffsetData (Action <MapCoord> mapCoordHanlder) {using (FileStream stream = new FileStream (offsetFullPath, FileMode. openOrCreate, FileAccess. read) {using (BinaryReader reader = new BinaryReader (stream) {int _ size = (int) stream. length/8; for (int I = 0; I <_ size; I ++) {byte [] _ source = reader. readBytes (8); MapCoord _ coord = ToCoord (_ source); mapCoordHanlder (_ coord );}}}} /// <summary> /// convert bytes to a specific data object // </summary> /// <param name = "bytes"> bytes </param> /// <returns> MapCoord </returns> private MapCoord ToCoord (byte [] bytes) {// longitude, latitude, x offset, y offset [Both bytes] MapCoord _ coord = new MapCoord (); byte [] _ b1 = new byte [2], _ b2 = new byte [2], _ b3 = new byte [2], _ b4 = new byte [2]; Array. copy (bytes, 0, _ b1, 0, 2); Array. copy (bytes, 2, _ b2, 0, 2); Array. copy (bytes, 4, _ b3, 0, 2); Array. copy (bytes, 6, _ b4, 0, 2); _ coord. lon = BitConverter. toInt16 (_ b1, 0); _ coord. lat = BitConverter. toInt16 (_ b2, 0); _ coord. x_off = BitConverter. toInt16 (_ b3, 0); _ coord. y_off = BitConverter. toInt16 (_ b4, 0); return _ coord ;} # endregion # region obtains the rectification Data Set /// <summary> // obtains the rectification Data Set /// </summary> /// <returns> correction data set </returns> public List <MapCoord> GetMapCoordList () {List <MapCoord> _ mapCoordList = new List <MapCoord> (); GetOffsetData (c => _ mapCoordList. add (c); return _ mapCoordList ;} /// <summary> /// get the rectification Data Set /// </summary> /// <returns> correction data set </returns> public ArrayList GetMapCoordArrayList () {ArrayList _ mapCoordArrayList = new ArrayList (); GetOffsetData (c => _ mapCoordArrayList. add (c); return _ mapCoordArrayList; }# endregion }}

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Using System. collections; using YanZhiwei. dotNet2.Utilities. models; using YanZhiwei. dotNet2.Utilities. tool; namespace YanZhiwei. dotNet2.Utilities. common {/// <summary> /// map correction help class /// </summary> public class MapOffsetHelper {/** reference: * 1. http://www.apkbus.com/forum.php?mod=viewthread&tid=137621&extra=page%3D1&page=1 * 2. http://yanue.net/post-122.html * 3. http://go2log.com/2011/08/30/%E4%B8%AD%E5%9B%BD%E5%9C%B0%E5%9B%BE%E5%81%8F%E7%A7%BB%E6%A0%A1%E6%AD%A3php%E7%AE%97%E6%B3%95/ * 4. http://www.devdiv.com/ios_gps_google_-blog-60266-10835.html */# Region constructor and variable private ArrayList mapCoordArrayList; /// <summary> /// constructor /// </summary> /// <param name = "offsetData"> correction data </param> public MapOffsetHelper (ArrayList offsetData) {mapCoordArrayList = offsetData;} # endregion # region private method private MapCoord QueryOffSetData (LatLngPoint point) {MapCoord _ search = new MapCoord (); _ search. lat = (int) (point. latY * 100); _ search. lon = (int) (point. lonX * 100); MapOffsetComparer rc = new MapOffsetComparer (); int _ findedIndex = mapCoordArrayList. binarySearch (0, mapCoordArrayList. count, _ search, rc); MapCoord _ findedCoord = (MapCoord) mapCoordArrayList [_ findedIndex]; return _ findedCoord;} # endregion # region Earth coordinate (WGS-84) to the Mars coordinate (GCJ-02) // <summary> // Earth coordinate (WGS-84) to the Mars coordinate (GCJ-02) /// </summary> /// <param name = "wgsPoint"> Earth coordinate (WGS-84) </param> // <returns> Mars coordinate (GCJ-02) </returns> public LatLngPoint WGS84ToGCJ02 (LatLngPoint wgsPoint) {MapCoord _ findedCoord = QueryOffSetData (wgsPoint); double _ pixY = MapHelper. latToPixel (wgsPoint. latY, 18); double _ pixX = MapHelper. lonToPixel (wgsPoint. lonX, 18); _ pixY + = _ findedCoord. y_off; _ pixX + = _ findedCoord. x_off; double _ lat = MapHelper. pixelToLat (_ pixY, 18); double _ lng = MapHelper. pixelToLon (_ pixX, 18); return new LatLngPoint (_ lat, _ lng);} # endregion # region Mars Coordinate Transfer (GCJ-02) Earth coordinate (WGS-84) /// <summary> // Mars Coordinate Transfer (GCJ-02) Earth coordinate (WGS-84) /// </summary> /// <param name = "gcjPoint"> (GCJ-02) </param> // <returns> (WGS-84) </returns> public LatLngPoint GCJ02ToWGS84 (LatLngPoint gcjPoint) {MapCoord _ findedCoord = QueryOffSetData (gcjPoint); double _ pixY = MapHelper. latToPixel (gcjPoint. latY, 18); double _ pixX = MapHelper. lonToPixel (gcjPoint. lonX, 18); _ pixY-= _ findedCoord. y_off; _ pixX-= _ findedCoord. x_off; double _ lat = MapHelper. pixelToLat (_ pixY, 18); double _ lng = MapHelper. pixelToLon (_ pixX, 18); return new LatLngPoint (_ lat, _ lng) ;}# endregion }}