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Shake.js edited for better error handling. Using a shake.error() function which can be overridden with an external function.
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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) { | |
| if (onShake) { | |
| shakeCallBack = onShake; | |
| } | |
| if (navigator.accelerometer !== undefined) { | |
| watchId = navigator.accelerometer.watchAcceleration(getAccelerationSnapshot, shake.error, options); | |
| } else { | |
| shake.error("Accelerometer Not Supported!"); | |
| } | |
| }; | |
| // Stop watching the accelerometer for a shake gesture | |
| shake.stopWatch = function () { | |
| if (watchId !== null) { | |
| navigator.accelerometer.clearWatch(watchId); | |
| watchId = null; | |
| } | |
| }; | |
| // Handle errors. Can be overridden with external function | |
| shake.error = function(msg) { | |
| console.error("Shake - " + msg); | |
| }; | |
| // Gets the current acceleration snapshot from the last accelerometer watch | |
| function getAccelerationSnapshot() { | |
| navigator.accelerometer.getCurrentAcceleration(assessCurrentAcceleration, shake.error); | |
| } | |
| // 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 | |
| } | |
| } | |
| } | |
| return shake; | |
| })(); |
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