Created
March 21, 2012 19:36
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modestmaps-js zoom drift
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script type="text/javascript" src="https://raw.github.com/stamen/modestmaps-js/master/modestmaps.js"></script> | |
| <style type="text/css"> | |
| html, body, #map { | |
| position: absolute; | |
| width: 100%; | |
| height: 100%; | |
| padding: 0; | |
| margin: 0; | |
| } | |
| #output { | |
| font-family: Monaco, monospace; | |
| font-size: 10px; | |
| line-height: 14px; | |
| position: absolute; | |
| bottom: 10px; | |
| left: 10px; | |
| width: 80%; | |
| z-index: 100; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="map"> | |
| <textarea id="output" rows="0"></textarea> | |
| </div> | |
| <script type="text/javascript" defer> | |
| var provider = new MM.TemplatedLayer("http://acetate.geoiq.com/tiles/acetate/{Z}/{X}/{Y}.png"), | |
| map = new MM.Map("map", provider, null, []); | |
| map.setCenterZoom(new MM.Location(2.511, -75.057), 8); | |
| function flot(n) { return n.toFixed(2); } | |
| function ctos(c) { return ["C(", flot(c.row), ", ", flot(c.column), " @ ", ~~c.zoom, ")"].join(""); } | |
| function ctol(c) { return map.coordinateLocation(c);} | |
| function ltos(l) { return ["L(", flot(l.lat), ", ", flot(l.lon), ")"].join(""); } | |
| function percent(n) { return (Math.abs(n) * 100).toFixed(0) + "%"; } | |
| function drift(a, b) { | |
| var delta = new MM.Location(b.lat - a.lat, b.lon - a.lon); | |
| return [ltos(delta), [percent(delta.lat / a.lat), percent(delta.lon / a.lon)].join(", ")].join(" "); | |
| } | |
| var output = document.getElementById("output"); | |
| function log() { | |
| var message = Array.prototype.join.call(arguments, " "); | |
| output.value += message + "\n"; | |
| output.rows = output.value.split("\n").length - 1; | |
| } | |
| var i = 1, | |
| steps = 5; | |
| log("zooming out from", map.getCenter(), steps, "times..."); | |
| function zoomOut() { | |
| var previous = map.coordinate, | |
| previousLocation = ctol(previous); | |
| log(i, "from:", ctos(previous), ltos(previousLocation)); | |
| map.zoomOut(); | |
| var current = map.coordinate, | |
| currentLocation = ctol(current); | |
| log(" to:", ctos(current), ltos(currentLocation), "drift:", drift(previousLocation, currentLocation)); | |
| if (i++ < steps) { | |
| setTimeout(zoomOut, 2000); | |
| } | |
| } | |
| zoomOut(); | |
| </script> | |
| </body> | |
| </html> |
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