function onSuccess(acceleration) { var element = document.getElementById('textfeld'); element.innerHTML = "x:"+ acceleration.x + "y:"+ acceleration.y +"
"+ "
"+ "
"+getAngle(acceleration.x, acceleration.y); handleAngle(getAngle(acceleration.x, acceleration.y) / 180 * Math.PI); }; function getAngle (x, y) { if (x == 0) x += 0.00001; x = -x; if (x < 0) return (360 - Math.atan(y / x) * 360 / 2 / Math.PI - 90); else return -(Math.atan(y / x) * 360 / 2 / Math.PI - 90); } function onError() { alert('onError!'); }; var startup = function(){ watchID = navigator.accelerometer.watchAcceleration(onSuccess, onError,options); lockinit(); } var options = { frequency: 100 }; document.addEventListener("deviceready", startup, false); //window.onload = startup;