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gesture-example.js
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			/**
			* @requires javelin-stratcom
			* javelin-behavior
			* javelin-vector
			* javelin-dom
			* @provides javelin-behavior-phabricator-gesture-example
			*/

			JX.behavior('phabricator-gesture-example', function(config) {

			var strokes = [];
			var current = [];

			var root = JX.$(config.rootID);

			var canvas = JX.$N('canvas');
			var d = JX.Vector.getDim(root);
			canvas.width = d.x;
			canvas.height = d.y;
			root.appendChild(canvas);

			var cxt = canvas.getContext('2d');
			JX.Stratcom.listen(
			'gesture.swipe.end',
			null,
			function(e) {
			var stroke = get_stroke(e);
			strokes.push(stroke);
			current = [];
			redraw();
			});

			JX.Stratcom.listen(
			'gesture.swipe.move',
			null,
			function(e) {
			var stroke = get_stroke(e);
			current = [stroke];
			redraw();
			});

			JX.Stratcom.listen(
			'gesture.swipe.cancel',
			null,
			function() {
			current = [];
			redraw();
			});

			function get_stroke(e) {
			var data = e.getData();
			var p = JX.$V(root);
			return [
			data.p0.x - p.x,
			data.p0.y - p.y,
			data.p1.x - p.x,
			data.p1.y - p.y
			];
			}

			function redraw() {
			cxt.fillStyle = '#dfdfdf';
			cxt.fillRect(0, 0, d.x, d.y);

			var s;
			var ii;
			for (ii = 0; ii < strokes.length; ii++) {
			s = strokes[ii];
			cxt.strokeStyle = 'rgba(0, 0, 0, 0.50)';
			cxt.beginPath();
			cxt.moveTo(s[0], s[1]);
			cxt.lineTo(s[2], s[3]);
			cxt.stroke();
			}

			for (ii = 0; ii < current.length; ii++) {
			s = current[ii];
			cxt.strokeStyle = 'rgba(255, 0, 0, 1)';
			cxt.beginPath();
			cxt.moveTo(s[0], s[1]);
			cxt.lineTo(s[2], s[3]);
			cxt.stroke();
			}
			}

			redraw();
			});