Created
May 28, 2013 17:47
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Playing about with ondevicemotion in MobileSafari on iOS to detect free fall
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Freefall detection test</title> | |
| <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> | |
| </head> | |
| <body> | |
| <div> | |
| accel: x, y, z | |
| </div> | |
| <div id="log-container"></div> | |
| <script> | |
| var logContainer = document.getElementById("log-container"), | |
| i = 0; | |
| window.ondevicemotion = function(event) { | |
| var a = event.accelerationIncludingGravity, | |
| logLine = document.createElement("div"); | |
| if (Math.abs(a.x) < 1 && Math.abs(a.y) < 1 && Math.abs(a.z) < 1) { | |
| // freefall(ish)! | |
| document.body.style.backgroundColor = "red"; | |
| } else { | |
| document.body.style.backgroundColor = "white"; | |
| } | |
| logLine.innerText = a.x.toFixed(3) + ", " + a.y.toFixed(3) + ", " + a.z.toFixed(3); | |
| logContainer.insertBefore(logLine, logContainer.firstChild); | |
| i++; | |
| if (i > 25) { | |
| logContainer.removeChild(logContainer.lastChild); | |
| } | |
| }; | |
| </script> | |
| </body> | |
| </html> |
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