310 	function onMouseDown( event ) {  argument
313 		event.preventDefault();
315 		if ( event.button === 0 ) {
320 			rotateStart.set( event.clientX, event.clientY );
322 		} else if ( event.button === 1 ) {
327 			dollyStart.set( event.clientX, event.clientY );
329 		} else if ( event.button === 2 ) {
334 			panStart.set( event.clientX, event.clientY );
344 	function onMouseMove( event ) {  argument
348 		event.preventDefault();
356 			rotateEnd.set( event.clientX, event.clientY );
371 			dollyEnd.set( event.clientX, event.clientY );
390 			panEnd.set( event.clientX, event.clientY );
414 	function onMouseWheel( event ) {  argument
418 		event.preventDefault();
422 		if ( event.wheelDelta !== undefined ) { // WebKit / Opera / Explorer 9
424 			delta = event.wheelDelta;
426 		} else if ( event.detail !== undefined ) { // Firefox
428 			delta = - event.detail;
448 	function onKeyDown( event ) {  argument
452 		switch ( event.keyCode ) {
478 	function touchstart( event ) {  argument
482 		switch ( event.touches.length ) {
490 				rotateStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
499 				var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
500 				var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
511 				panStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
524 	function touchmove( event ) {  argument
528 		event.preventDefault();
529 		event.stopPropagation();
533 		switch ( event.touches.length ) {
540 				rotateEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
558 				var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
559 				var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
585 				panEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
612 …this.domElement.addEventListener( 'contextmenu', function ( event ) { event.preventDefault(); }, f…  argument