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61 lines
2.3 KiB
Plaintext
61 lines
2.3 KiB
Plaintext
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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module device.mojom;
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import "mojo/common/time.mojom";
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// Sentinel values to mark invalid data. (WebKit carries companion is_valid
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// bools for this purpose; we may eventually follow that approach, but
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// sentinels worked OK in the Gears code this is based on.)
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const double kBadLatitudeLongitude = 200;
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// Lowest point on land is at approximately -400 meters.
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const double kBadAltitude = -10000;
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const double kBadAccuracy = -1; // Accuracy must be non-negative.
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const double kBadHeading = -1; // Heading must be non-negative.
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const double kBadSpeed = -1;
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// A Geoposition represents a position fix. It was originally derived from:
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// http://gears.googlecode.com/svn/trunk/gears/geolocation/geolocation.h
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struct Geoposition {
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// These values follow the W3C geolocation specification and can be returned
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// to JavaScript without the need for a conversion.
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enum ErrorCode {
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NONE = 0, // Chrome addition.
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PERMISSION_DENIED = 1,
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POSITION_UNAVAILABLE = 2,
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TIMEOUT = 3,
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LAST = TIMEOUT
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};
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// Whether this geoposition is valid.
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bool valid;
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// These properties correspond to those of the JavaScript Position object
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// although their types may differ.
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// Latitude in decimal degrees north (WGS84 coordinate frame).
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double latitude = kBadLatitudeLongitude;
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// Longitude in decimal degrees west (WGS84 coordinate frame).
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double longitude = kBadLatitudeLongitude;
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// Altitude in meters (above WGS84 datum).
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double altitude = kBadAltitude;
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// Accuracy of horizontal position in meters.
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double accuracy = kBadAccuracy;
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// Accuracy of altitude in meters.
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double altitude_accuracy = kBadAccuracy;
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// Heading in decimal degrees clockwise from true north.
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double heading = kBadHeading;
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// Horizontal component of device velocity in meters per second.
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double speed = kBadSpeed;
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// Time of position measurement in seconds since the Windows FILETIME epoch
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// (1601-01-01 00:00:00 UTC). This is taken from the host computer's system
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// clock (i.e. from Time::Now(), not the source device's clock).
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mojo.common.mojom.Time timestamp;
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// Error code, see enum above.
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ErrorCode error_code = NONE;
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// Human-readable error message.
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string error_message;
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};
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