https://brewstersociety.com/wp-content/plugins/meteor-slides/js/jquery.touchwipe.1.1.1.js

1/**
2 * jQuery Plugin to obtain touch gestures from iPhone, iPod Touch and iPad, should also work with Android mobile phones (not tested yet!)
3 * Common usage: wipe images (left and right to show the previous or next image)
4 * 
5 * @author Andreas Waltl, netCU Internetagentur (http://www.netcu.de)
6 * @version 1.1.1 (9th December 2010) - fix bug (older IE's had problems)
7 * @version 1.1 (1st September 2010) - support wipe up and wipe down
8 * @version 1.0 (15th July 2010)
9 */
10(function($) { 
11   $.fn.touchwipe = function(settings) {
12     var config = {
13    		min_move_x: 20,
14    		min_move_y: 20,
15 			wipeLeft: function() { },
16 			wipeRight: function() { },
17 			wipeUp: function() { },
18 			wipeDown: function() { },
19			preventDefaultEvents: true
20	 };
21     
22     if (settings) $.extend(config, settings);
23 
24     this.each(function() {
25    	 var startX;
26    	 var startY;
27		 var isMoving = false;
28
29    	 function cancelTouch() {
30    		 this.removeEventListener('touchmove', onTouchMove);
31    		 startX = null;
32    		 isMoving = false;
33    	 }	
34    	 
35    	 function onTouchMove(e) {
36    		 if(config.preventDefaultEvents) {
37    			 e.preventDefault();
38    		 }
39    		 if(isMoving) {
40	    		 var x = e.touches[0].pageX;
41	    		 var y = e.touches[0].pageY;
42	    		 var dx = startX - x;
43	    		 var dy = startY - y;
44	    		 if(Math.abs(dx) >= config.min_move_x) {
45	    			cancelTouch();
46	    			if(dx > 0) {
47	    				config.wipeLeft();
48	    			}
49	    			else {
50	    				config.wipeRight();
51	    			}
52	    		 }
53	    		 else if(Math.abs(dy) >= config.min_move_y) {
54		    			cancelTouch();
55		    			if(dy > 0) {
56		    				config.wipeDown();
57		    			}
58		    			else {
59		    				config.wipeUp();
60		    			}
61		    		 }
62    		 }
63    	 }
64    	 
65    	 function onTouchStart(e)
66    	 {
67    		 if (e.touches.length == 1) {
68    			 startX = e.touches[0].pageX;
69    			 startY = e.touches[0].pageY;
70    			 isMoving = true;
71    			 this.addEventListener('touchmove', onTouchMove, false);
72    		 }
73    	 }    	 
74    	 if ('ontouchstart' in document.documentElement) {
75    		 this.addEventListener('touchstart', onTouchStart, false);
76    	 }
77     });
78 
79     return this;
80   };
81 
82 })(jQuery);