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comparison: dom/interfaces/events/nsIDOMDeviceOrientationEvent.idl
dom/interfaces/events/nsIDOMDeviceOrientationEvent.idl
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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 #include "nsIDOMEvent.idl" | |
| 6 | |
| 7 [scriptable, builtinclass, uuid(f5921a77-3ac5-4374-bc0c-1ed52fe83123)] | |
| 8 interface nsIDOMDeviceOrientationEvent : nsIDOMEvent | |
| 9 { | |
| 10 void initDeviceOrientationEvent(in DOMString eventTypeArg, | |
| 11 in boolean canBubbleArg, | |
| 12 in boolean cancelableArg, | |
| 13 in double alpha, | |
| 14 in double beta, | |
| 15 in double gamma, | |
| 16 in boolean absolute); | |
| 17 | |
| 18 /* | |
| 19 * W3C specification values: http://dev.w3.org/geo/api/spec-source-orientation.html | |
| 20 * | |
| 21 * Alpha, beta and gamma are Tait-Bryan angles (Z-X'-Y''), that is they correspond to | |
| 22 * yaw, pitch and roll in flight coordinates. More specifically, assume the device | |
| 23 * is resting face up on a flat surface (its screen is pointing straight up). Then | |
| 24 * the X axis points to the right when looking at the screen, the Y axis points up | |
| 25 * when looking at the screen, and the Z axis points toward you when looking at | |
| 26 * the screen. Alpha/beta/gamma then define the device's orientation by applying | |
| 27 * the following rotations to the device in order: | |
| 28 * | |
| 29 * 1) Rotate it by alpha degrees around its Z axis (like a compass, or like changing | |
| 30 * the yaw of an aircraft, assuming the Y axis is the nose of the craft); alpha | |
| 31 * is in [0,360). | |
| 32 * 2) Rotate it by beta degrees around its X axis (tilting the top of the device | |
| 33 * towards or away from you, like pitching an aircraft); beta is in [-180,180). | |
| 34 * 3) Rotate it by gamma degrees around its Y axis (tilting it sideways, like | |
| 35 * rolling an aircraft); gamma is in [-90,90). | |
| 36 */ | |
| 37 | |
| 38 readonly attribute double alpha; | |
| 39 readonly attribute double beta; | |
| 40 readonly attribute double gamma; | |
| 41 readonly attribute boolean absolute; | |
| 42 }; |
