function mousedown()

in viewer/legacy/js/TrackballControls.js [387:422]

• 21 lines of code
• 9 McCabe index (conditional complexity)

	function mousedown( event ) {

		if ( _this.enabled === false ) return;

		event.preventDefault();
		event.stopPropagation();

		if ( _state === STATE.NONE ) {

			_state = event.button;

		}

		if ( _state === STATE.ROTATE && !_this.noRotate ) {

			_rotateStart = _this.getMouseProjectionOnBall( event.pageX, event.pageY, _rotateStart );
			_rotateEnd.copy(_rotateStart)

		} else if ( _state === STATE.ZOOM && !_this.noZoom ) {

			_zoomStart = _this.getMouseOnScreen( event.pageX, event.pageY, _zoomStart );
			_zoomEnd.copy(_zoomStart);

		} else if ( _state === STATE.PAN && !_this.noPan ) {

			_panStart = _this.getMouseOnScreen( event.pageX, event.pageY, _panStart);
			_panEnd.copy(_panStart)

		}

		document.addEventListener( 'mousemove', mousemove, false );
		document.addEventListener( 'mouseup', mouseup, false );
		_this.dispatchEvent( startEvent );


	}