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August 29, 2015 14:01
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touch it then shake it.
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| <html> | |
| <head> | |
| <style> | |
| #viewport { | |
| border: 1px solid #000000; | |
| } | |
| </style> | |
| <script src="gbend.js"></script> | |
| </head> | |
| <body> | |
| <canvas id="viewport" width=300 height=300></canvas> | |
| </body> | |
| </html> |
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| var gContext; | |
| var gOscillator; | |
| function onLoad() { | |
| gContext = new webkitAudioContext(); | |
| addEventListeners(); | |
| } | |
| function addEventListeners() { | |
| var view = document.getElementById("viewport"); | |
| view.addEventListener("touchstart", onTouchStart, false); | |
| view.addEventListener("touchend", onTouchEnd, false); | |
| window.addEventListener("devicemotion", onDeviceMotion, false); | |
| } | |
| function onTouchStart(event) { | |
| event.preventDefault(); | |
| var gain = gContext.createGainNode(); | |
| gain.gain.value = 0.5; | |
| gain.connect(gContext.destination); | |
| gOscillator = gContext.createOscillator(); | |
| gOscillator.type = "square"; | |
| gOscillator.frequency.value = 440.0; | |
| gOscillator.connect(gain); | |
| gOscillator.start(0); | |
| } | |
| function onTouchEnd(event) { | |
| event.preventDefault(); | |
| gOscillator.stop(0); | |
| gOscillator = null; | |
| } | |
| function onDeviceMotion(event) { | |
| event.preventDefault(); | |
| var acc = event.accelerationIncludingGravity; | |
| if (gOscillator === null) { | |
| return; | |
| } | |
| var v = Math.sqrt(acc.x * acc.x + acc.y * acc.y + acc.z * acc.z); | |
| gOscillator.frequency.value = 440.0 + (v - 9.81) * 2; | |
| } | |
| window.addEventListener("load", onLoad, false); |
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