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@phoeagon
Forked from leecrossley/shake.js
Created August 2, 2013 10:59
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var shake = (function () {
var shake = {},
watchId = null,
options = { frequency: 300 },
previousAcceleration = { x: null, y: null, z: null },
shakeCallBack = null;
// Start watching the accelerometer for a shake gesture
shake.startWatch = function (onShake) {
shakeCallBack = onShake;
watchId = navigator.accelerometer.watchAcceleration(getAccelerationSnapshot, handleError, options);
};
// Stop watching the accelerometer for a shake gesture
shake.stopWatch = function () {
if (watchId !== null) {
navigator.accelerometer.clearWatch(watchId);
watchId = null;
}
};
// Gets the current acceleration snapshot from the last accelerometer watch
function getAccelerationSnapshot() {
navigator.accelerometer.getCurrentAcceleration(assessCurrentAcceleration, handleError);
}
// Assess the current acceleration parameters to determine a shake
function assessCurrentAcceleration(acceleration) {
var accelerationChange = {};
if (previousAcceleration.x !== null) {
accelerationChange.x = Math.abs(previousAcceleration.x, acceleration.x);
accelerationChange.y = Math.abs(previousAcceleration.y, acceleration.y);
accelerationChange.z = Math.abs(previousAcceleration.z, acceleration.z);
}
if (accelerationChange.x + accelerationChange.y + accelerationChange.z > 30) {
// Shake detected
if (typeof (shakeCallBack) === "function") {
shakeCallBack();
}
shake.stopWatch();
setTimeout(shake.startWatch, 1000);
previousAcceleration = {
x: null,
y: null,
z: null
}
} else {
previousAcceleration = {
x: acceleration.x,
y: acceleration.y,
z: acceleration.z
}
}
}
// Handle errors here
function handleError() {
}
return shake;
})();
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