Created
November 13, 2012 15:39
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Figure out max vibration value
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"use strict"; | |
(function(global){ | |
if(typeof global.navigator.vibrate === 'function') | |
return; | |
var MAX = Math.floor(1000000*Math.random()); | |
console.log('MAX', MAX); | |
global.navigator.vibrate = function vibrate(time){ | |
if(time === 0){ | |
console.log('vibrate canceled!') | |
return; | |
} | |
if(time > MAX) | |
throw new Error('I cannot vibrate for that long, dude!'); | |
console.log('vibrating for '+time+' ms', 'br'+Array(Math.floor(Math.log(time))).join('r')) | |
} | |
})(this); | |
(function(){ | |
function tryVibrationTime(t){ | |
var vibrate = navigator.vibrate.bind(navigator); | |
try{ | |
vibrate(t); | |
vibrate(0); // cancelling the vibration to not annoy the user. | |
// it worked since no error was thrown | |
return true; | |
} | |
catch(e){ // oops, tried to vibrate for too long | |
return false; | |
} | |
} | |
function figureOutVibrationLimit(){ | |
var vibrateMin = 1; | |
var vibrateMax; | |
var attempt; | |
while(vibrateMax === undefined && attempt !== Infinity){ | |
attempt = vibrateMin*2; | |
if(tryVibrationTime(attempt)) | |
vibrateMin = attempt; | |
else | |
vibrateMax = attempt; | |
} | |
if(attempt === Infinity) | |
return Infinity; | |
// now we know the value is between vibrateMin and vibrateMax. DICHOTOMY!!! | |
while(vibrateMax - vibrateMin > 1){ | |
attempt = Math.floor( (vibrateMin+vibrateMax)/2 ); | |
if(tryVibrationTime(attempt)) | |
vibrateMin = attempt; | |
else | |
vibrateMax = attempt; | |
} | |
return vibrateMin; | |
} | |
console.log(figureOutVibrationLimit()); | |
})() |
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