jQuery.MapConvert = {
x_pi: 3.14159265358979324 * 3000.0 / 180.0,
/// <summary>
/// 中國正常坐標系GCJ02協議的坐標，轉到 百度地圖對應的 BD09 協議坐標
/// point 為傳入的對象，例如{lat:xxxxx,lng:xxxxx}
/// </summary>
Convert_GCJ02_To_BD09: function (point) {
var x = point.lng, y = point.lat;
var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * jQuery.MapConvert.x_pi);
var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * jQuery.MapConvert.x_pi);
point.lng = z * Math.cos(theta) + 0.0065;
point.lat = z * Math.sin(theta) + 0.006;
},
/// <summary>
/// 百度地圖對應的 BD09 協議坐標，轉到 中國正常坐標系GCJ02協議的坐標
/// </summary>
Convert_BD09_To_GCJ02: function (point) {
var x = point.lng - 0.0065, y = point.lat - 0.006;
var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * jQuery.MapConvert.x_pi);
var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * jQuery.MapConvert.x_pi);
point.lng = z * Math.cos(theta);
point.lat = z * Math.sin(theta);
}
}