function touchmove()

in viewer/legacy/js/OrbitControls.js [512:589]
46 lines of code
13 McCabe index (conditional complexity)

	function touchmove( event ) {

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

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

		var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

		switch ( event.touches.length ) {

			case 1: // one-fingered touch: rotate

				if ( scope.noRotate === true ) return;
				if ( state !== STATE.TOUCH_ROTATE ) return;

				rotateEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
				rotateDelta.subVectors( rotateEnd, rotateStart );

				// rotating across whole screen goes 360 degrees around
				scope.rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientWidth * scope.rotateSpeed );
				// rotating up and down along whole screen attempts to go 360, but limited to 180
				scope.rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight * scope.rotateSpeed );

				rotateStart.copy( rotateEnd );

				scope.update();
				break;

			case 2: // two-fingered touch: dolly

				if ( scope.noZoom === true ) return;
				if ( state !== STATE.TOUCH_DOLLY ) return;

				var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
				var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
				var distance = Math.sqrt( dx * dx + dy * dy );

				dollyEnd.set( 0, distance );
				dollyDelta.subVectors( dollyEnd, dollyStart );

				if ( dollyDelta.y > 0 ) {

					scope.dollyOut(getZoomScale());

				} else {

					scope.dollyIn(getZoomScale());

				}

				dollyStart.copy( dollyEnd );

				scope.update();
				break;

			case 3: // three-fingered touch: pan

				if ( scope.noPan === true ) return;
				if ( state !== STATE.TOUCH_PAN ) return;

				panEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
				panDelta.subVectors( panEnd, panStart );

				scope.pan( panDelta.x, panDelta.y );

				panStart.copy( panEnd );

				scope.update();
				break;

			default:

				state = STATE.NONE;

		}

	}