Function augmentTouchEvent

src/ui/viewer/lightgl.js:1401–1445

(original)

		}

		function augmentTouchEvent(original) {
			var e = {};
			for(var name in original) {
				if(typeof original[name] == 'function') {
					e[name] = (function(callback) {
						return function() {
							callback.apply(original, arguments);
						};
					})(original[name]);
				} else {
					e[name] = original[name];
				}
			}
			e.original = original;

			if(e.targetTouches.length > 0) {
				var touch = e.targetTouches[0];
				e.x = touch.pageX;
				e.y = touch.pageY;

				for(var obj = gl.canvas; obj; obj = obj.offsetParent) {
					e.x -= obj.offsetLeft;
					e.y -= obj.offsetTop;
				}
				if(hasOld) {
					e.deltaX = e.x - oldX;
					e.deltaY = e.y - oldY;
				} else {
					e.deltaX = 0;
					e.deltaY = 0;
					hasOld = true;
				}
				oldX = e.x;
				oldY = e.y;
				e.dragging = true;
			}

			e.preventDefault = function() {
				e.original.preventDefault();
			};
			e.stopPropagation = function() {
				e.original.stopPropagation();
			};
			return e;
		}

		function mousedown(e) {
			gl = context;