Created
July 31, 2013 16:33
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/*
Based on the krpano iOS 4.2 gyroscope script
by Aldo Hoeben / fieldofview.com
contributions by Sjeiti / ronvalstar.nl Port for Pano2VR
Thomas Rauscher / gardengnomesoftware.com
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/* | |
Based on the krpano iOS 4.2 gyroscope script | |
by Aldo Hoeben / fieldofview.com | |
contributions by Sjeiti / ronvalstar.nl | |
Port for Pano2VR | |
Thomas Rauscher / gardengnomesoftware.com | |
This software can be used free of charge and the source code is available under a Creative Commons Attribution license: | |
http://creativecommons.org/licenses/by/3.0/ | |
*/ | |
function pano2vrGyro(panoObject,containerId) { | |
this.enable=function() { | |
if (isDeviceEnabled && !isEnabled) { | |
window.addEventListener("deviceorientation", handleDeviceOrientation, true); | |
container.addEventListener("touchstart", handleTouchStart, true); | |
container.addEventListener("touchend", handleTouchEnd, true); | |
container.addEventListener("touchcancel", handleTouchEnd, true); | |
isEnabled = true; | |
} | |
return isEnabled; | |
} | |
this.disable=function() { | |
if (isDeviceEnabled && isEnabled) { | |
window.removeEventListener("deviceorientation", handleDeviceOrientation); | |
container.removeEventListener("touchstart", handleTouchStart); | |
container.removeEventListener("touchend", handleTouchEnd); | |
container.removeEventListener("touchcancel", handleTouchEnd); | |
isEnabled = false; | |
} | |
return isEnabled; | |
} | |
this.toggle=function() { | |
if(isEnabled) | |
return this.disable(); | |
else | |
return this.enable(); | |
} | |
this.setAdaptiveVOffset=function(arg) { | |
if(arg==undefined || arg === null || arg == "") | |
isAdaptiveDiffTilt = !isAdaptiveDiffTilt; | |
else | |
isAdaptiveDiffTilt = Boolean(arg); | |
} | |
//////////////////////////////////////////////////////////// | |
function handleTouchStart(event) { | |
isTouching = true; | |
} | |
function handleTouchEnd(event) { | |
isTouching = false; | |
} | |
var lastYaw=0; | |
var lastPitch=0; | |
var lastTouch=0; | |
var ignoreInit=10; | |
function handleDeviceOrientation(event) { | |
if ((!event["alpha"]) || (!event["beta"]) || (!event["gamma"])) return; | |
var d = new Date(); | |
var isTouching=(panoObj.isTouching()); | |
if (isTouching) { | |
lastTouch = d.getTime(); | |
} | |
if ( !isTouching && isEnabled && (d.getTime()-lastTouch)>1000) { | |
// process event.alpha, event.beta and event.gamma | |
var orientation = rotateEuler( new Object( { | |
yaw: event["alpha"] * degRad, | |
pitch: event["beta"] * degRad, | |
roll: event["gamma"] * degRad | |
} ) ), | |
yaw = orientation.yaw / degRad, | |
pitch = orientation.pitch / degRad, | |
altyaw = yaw, | |
factor; | |
// fix gimbal lock | |
if( Math.abs(pitch) > 70 ) { | |
altyaw = event.alpha; | |
switch(window.orientation) { | |
case 0: | |
if ( pitch>0 ) | |
altyaw += 180; | |
break; | |
case 90: | |
altyaw += 90; | |
break; | |
case -90: | |
altyaw += -90; | |
break; | |
case 180: | |
if ( pitch<0 ) | |
altyaw += 180; | |
break; | |
} | |
altyaw = altyaw % 360; | |
if( Math.abs( altyaw - yaw ) > 180 ) | |
altyaw += ( altyaw < yaw ) ? 360 : -360; | |
factor = Math.min( 1, ( Math.abs( pitch ) - 70 ) / 10 ); | |
yaw = yaw * ( 1-factor ) + altyaw * factor; | |
} | |
if (ignoreInit==0) { | |
panoObj.moveTo(diffPan + yaw ,diffTilt - pitch,panoObj.getFov(),10); | |
} | |
lastYaw = yaw; | |
lastPitch = -pitch; | |
if (ignoreInit>0) { | |
diffPan = panoObj.getPan() - lastYaw; | |
diffTilt = panoObj.getTilt() - lastPitch; | |
ignoreInit--; | |
} | |
adaptDiffTilt(); | |
} else { | |
diffPan = panoObj.getPan() - lastYaw; | |
diffTilt = panoObj.getTilt() - lastPitch; | |
} | |
} | |
function adaptDiffTilt() { | |
if( diffTilt != 0 && isAdaptiveDiffTilt ) { | |
diffTilt *= 0.98; | |
if( Math.abs( diffTilt ) < 0.1 ) { | |
diffTilt = 0; | |
} | |
} | |
} | |
function rotateEuler( euler ) { | |
// based on http://www.euclideanspace.com/maths/geometry/rotations/conversions/eulerToMatrix/index.htm | |
// and http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToEuler/index.htm | |
var heading, bank, attitude, | |
ch = Math.cos(euler.yaw), | |
sh = Math.sin(euler.yaw), | |
ca = Math.cos(euler.pitch), | |
sa = Math.sin(euler.pitch), | |
cb = Math.cos(euler.roll), | |
sb = Math.sin(euler.roll); | |
// note: includes 90 degree rotation around z axis | |
matrix = new Array( | |
sh*sb - ch*sa*cb, -ch*ca, ch*sa*sb + sh*cb, | |
ca*cb, -sa, -ca*sb, | |
sh*sa*cb + ch*sb, sh*ca, -sh*sa*sb + ch*cb | |
); | |
/* [m00 m01 m02] 0 1 2 | |
* [m10 m11 m12] 3 4 5 | |
* [m20 m21 m22] 6 7 8 */ | |
if (matrix[3] > 0.9999) { // singularity at north pole | |
heading = Math.atan2(matrix[2],matrix[8]); | |
attitude = Math.PI/2; | |
bank = 0; | |
} else if (matrix[3] < -0.9999) { // singularity at south pole | |
heading = Math.atan2(matrix[2],matrix[8]); | |
attitude = -Math.PI/2; | |
bank = 0; | |
} else { | |
heading = Math.atan2(-matrix[6],matrix[0]); | |
bank = Math.atan2(-matrix[5],matrix[4]); | |
attitude = Math.asin(matrix[3]); | |
} | |
return new Object( { yaw:heading, pitch:attitude, roll:bank } ) | |
} | |
/////////////////////////////////////////////////// | |
var isDeviceEnabled = !!window.DeviceOrientationEvent, | |
panoObj, | |
isEnabled = false, | |
isAdaptiveDiffTilt = false, | |
isEasing = 0.5; | |
isTouching = false, | |
diffPan = 0, diffTilt = 0, | |
hlookat = 0, vlookat = 0, | |
degRad = Math.PI/180; | |
panoObj=panoObject; | |
// turn on "auto level" | |
isAdaptiveDiffTilt=true; | |
var container = document.getElementById(containerId); | |
diffPan = panoObj.getPan(); | |
diffTilt = panoObj.getTilt(); | |
this.enable(); | |
//////////////////////////////////////////////////////////// | |
} |
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