345 	function keydown( event ) {  argument
357 		} else if ( event.keyCode === _this.keys[ STATE.ROTATE ] && ! _this.noRotate ) {
361 		} else if ( event.keyCode === _this.keys[ STATE.ZOOM ] && ! _this.noZoom ) {
365 		} else if ( event.keyCode === _this.keys[ STATE.PAN ] && ! _this.noPan ) {
373 	function keyup( event ) {  argument
383 	function mousedown( event ) {  argument
387 		event.preventDefault();
388 		event.stopPropagation();
392 			_state = event.button;
398 			_moveCurr.copy( getMouseOnCircle( event.pageX, event.pageY ) );
403 			_zoomStart.copy( getMouseOnScreen( event.pageX, event.pageY ) );
408 			_panStart.copy( getMouseOnScreen( event.pageX, event.pageY ) );
420 	function mousemove( event ) {  argument
424 		event.preventDefault();
425 		event.stopPropagation();
430 			_moveCurr.copy( getMouseOnCircle( event.pageX, event.pageY ) );
434 			_zoomEnd.copy( getMouseOnScreen( event.pageX, event.pageY ) );
438 			_panEnd.copy( getMouseOnScreen( event.pageX, event.pageY ) );
444 	function mouseup( event ) {  argument
448 		event.preventDefault();
449 		event.stopPropagation();
459 	function mousewheel( event ) {  argument
465 		event.preventDefault();
466 		event.stopPropagation();
468 		switch ( event.deltaMode ) {
472 				_zoomStart.y -= event.deltaY * 0.025;
477 				_zoomStart.y -= event.deltaY * 0.01;
482 				_zoomStart.y -= event.deltaY * 0.00025;
492 	function touchstart( event ) {  argument
496 		event.preventDefault();
498 		switch ( event.touches.length ) {
502 				_moveCurr.copy( getMouseOnCircle( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ) );
508 				var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
509 				var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
512 				var x = ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX ) / 2;
513 				var y = ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY ) / 2;
524 	function touchmove( event ) {  argument
528 		event.preventDefault();
529 		event.stopPropagation();
531 		switch ( event.touches.length ) {
535 				_moveCurr.copy( getMouseOnCircle( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ) );
539 				var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
540 				var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
543 				var x = ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX ) / 2;
544 				var y = ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY ) / 2;
552 	function touchend( event ) {  argument
556 		switch ( event.touches.length ) {
564 				_moveCurr.copy( getMouseOnCircle( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ) );
574 	function contextmenu( event ) {  argument
578 		event.preventDefault();