This is the counter-example to Hilbert Tiles.
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February 8, 2016 23:09
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Sequential Tiles
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script type="text/javascript" src="http://polymaps.org/polymaps.min.js"></script> | |
| <style type="text/css"> | |
| @import url("http://polymaps.org/style.css"); | |
| </style> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| var po = org.polymaps; | |
| var size = {x: 32, y: 32}; | |
| var map = po.map() | |
| .container(document.body.appendChild(po.svg("svg"))) | |
| .zoomRange([0, 6]) | |
| .zoom(4) | |
| .center({lat: 0, lon: 0}) | |
| .tileSize(size) | |
| .add(po.interact()); | |
| map.add(po.layer(rainbow)); | |
| map.add(po.compass() | |
| .pan("none")); | |
| function rainbow(tile) { | |
| var rect = tile.element = po.svg("rect"), | |
| k = 1 << tile.zoom, | |
| i = tile.column + tile.row * k, | |
| j = ~~(i * 360 / Math.pow(4, tile.zoom)); | |
| if (tile.column < 0 || tile.column >= k) return; | |
| rect.setAttribute("width", size.x); | |
| rect.setAttribute("height", size.y); | |
| rect.setAttribute("fill", hsl(j, 1, .5)); | |
| } | |
| function hsl(h, s, l) { | |
| var m1, | |
| m2; | |
| /* Some simple corrections for h, s and l. */ | |
| h = h % 360; if (h < 0) h += 360; | |
| s = s < 0 ? 0 : s > 1 ? 1 : s; | |
| l = l < 0 ? 0 : l > 1 ? 1 : l; | |
| /* From FvD 13.37, CSS Color Module Level 3 */ | |
| m2 = l <= .5 ? l * (1 + s) : l + s - l * s; | |
| m1 = 2 * l - m2; | |
| function v(h) { | |
| if (h > 360) h -= 360; | |
| else if (h < 0) h += 360; | |
| if (h < 60) return m1 + (m2 - m1) * h / 60; | |
| if (h < 180) return m2; | |
| if (h < 240) return m1 + (m2 - m1) * (240 - h) / 60; | |
| return m1; | |
| } | |
| function vv(h) { | |
| return Math.round(v(h) * 255); | |
| } | |
| return "rgb(" + vv(h + 120) + "," + vv(h) + "," + vv(h - 120) + ")"; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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