nl_tokens: Event handler for touches . Initializes panning if one touch or zooming if two touches .
pl_tokens: function onDocumentTouchStart ( event ) { // Only do something if the panorama is loaded if ( ! loaded || ! config . draggable ) { return ; } // Turn off auto-rotation if enabled stopAnimation ( ) ; stopOrientation ( ) ; config . roll = 0 ; speed . hfov = 0 ; // Calculate touch position relative to top left of viewer container var pos0 = mousePosition ( event . targetTouches [ 0 ] ) ; onPointerDownPointerX = pos0 . x ; onPointerDownPointerY = pos0 . y ; if ( event . targetTouches . length == 2 ) { // Down pointer is the center of the two fingers var pos1 = mousePosition ( event . targetTouches [ 1 ] ) ; onPointerDownPointerX += ( pos1 . x - pos0 . x ) * 0.5 ; onPointerDownPointerY += ( pos1 . y - pos0 . y ) * 0.5 ; onPointerDownPointerDist = Math . sqrt ( ( pos0 . x - pos1 . x ) * ( pos0 . x - pos1 . x ) + ( pos0 . y - pos1 . y ) * ( pos0 . y - pos1 . y ) ) ; } isUserInteracting = <mask> ; latestInteraction = Date . now ( ) ; onPointerDownYaw = config . yaw ; onPointerDownPitch = config . pitch ; fireEvent ( 'touchstart' , event ) ; animateInit ( ) ; }