content/public/common/geoposition.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // This file declares the Geoposition structure, used to represent a position
   6 // fix. It was originally derived from:
   7 // http://gears.googlecode.com/svn/trunk/gears/geolocation/geolocation.h
   8
   9 #ifndef CONTENT_PUBLIC_COMMON_GEOPOSITION_H_
  10 #define CONTENT_PUBLIC_COMMON_GEOPOSITION_H_
  11
  12 #include <string>
  13
  14 #include "base/time.h"
  15 #include "content/common/content_export.h"
  16
  17 namespace content {
  18
  19 struct CONTENT_EXPORT Geoposition {
  20  public:
  21   // These values follow the W3C geolocation specification and can be returned
  22   // to JavaScript without the need for a conversion.
  23   enum ErrorCode {
  24     ERROR_CODE_NONE = 0,  // Chrome addition.
  25     ERROR_CODE_PERMISSION_DENIED = 1,
  26     ERROR_CODE_POSITION_UNAVAILABLE = 2,
  27     ERROR_CODE_TIMEOUT = 3,
  28   };
  29
  30   // All fields are initialized to sentinel values marking them as invalid. The
  31   // error code is set to ERROR_CODE_NONE.
  32   Geoposition();
  33
  34   // A valid fix has a valid latitude, longitude, accuracy and timestamp.
  35   bool Validate() const;
  36
  37   // These properties correspond to those of the JavaScript Position object
  38   // although their types may differ.
  39   // Latitude in decimal degrees north (WGS84 coordinate frame).
  40   double latitude;
  41   // Longitude in decimal degrees west (WGS84 coordinate frame).
  42   double longitude;
  43   // Altitude in meters (above WGS84 datum).
  44   double altitude;
  45   // Accuracy of horizontal position in meters.
  46   double accuracy;
  47   // Accuracy of altitude in meters.
  48   double altitude_accuracy;
  49   // Heading in decimal degrees clockwise from true north.
  50   double heading;
  51   // Horizontal component of device velocity in meters per second.
  52   double speed;
  53   // Time of position measurement in milisecons since Epoch in UTC time. This is
  54   // taken from the host computer's system clock (i.e. from Time::Now(), not the
  55   // source device's clock).
  56   base::Time timestamp;
  57
  58   // Error code, see enum above.
  59   ErrorCode error_code;
  60   // Human-readable error message.
  61   std::string error_message;
  62 };
  63
  64 }  // namespace content
  65
  66 #endif  // CONTENT_COMMON_GEOPOSITION_H_