b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
81 lines
2 KiB
JavaScript
Executable file
81 lines
2 KiB
JavaScript
Executable file
define(function(require, exports, module) {
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'use strict';
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var listener = require('device-orientation');
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var classes = document.body.classList;
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var current = 0;
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listener.on('orientation', onOrientationChange);
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listener.start();
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function onOrientationChange(degrees) {
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classes.remove('deg' + current);
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classes.add('deg' + degrees);
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current = degrees;
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}
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// Camera normally has its orientation locked to portrait mode.
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// But we unlock orientation when displaying image and video previews.
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// When orientation is unlocked, we call listener.stop().
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// We calls call stop() when recording a video, and then restart
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// when recording is done. If our app ever changes so that we can call
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// unlock while the orientation listener is in the stopped state, then
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// we would need to modify the lock() function so that it did not
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// restart the listener. That is not needed now, however and is omitted.
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function unlock() {
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screen.mozUnlockOrientation();
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listener.stop();
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}
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function lock() {
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screen.mozLockOrientation('default');
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listener.start();
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}
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function rationalize(sensorAngle, angle) {
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if (typeof(angle) === 'undefined') {
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angle = current;
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}
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// The result of this operation is an angle from 0..270 degrees,
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// in steps of 90 degrees. Angles are rounded to the nearest
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// magnitude, so 45 will be rounded to 90, and -45 will be rounded
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// to -90 (not 0).
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var r = angle + sensorAngle;
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if (r >= 0) {
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r += 45;
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} else {
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r -= 45;
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}
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r /= 90;
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if (r >= 0) {
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r = Math.floor(r);
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} else {
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r = Math.ceil(r);
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}
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r %= 4;
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r *= 90;
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if (r < 0) {
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r += 360;
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}
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return r;
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}
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/**
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* Exports
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*/
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module.exports = {
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on: listener.on,
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off: listener.off,
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start: listener.start,
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stop: listener.stop,
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unlock: unlock,
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lock: lock,
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rationalize: rationalize,
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get: function() {
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return current;
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}
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};
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});
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