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| author | Chris Schlaeger <chris@linux.com> | 2014-08-12 21:56:44 +0200 |
|---|---|---|
| committer | Chris Schlaeger <chris@linux.com> | 2014-08-12 21:56:44 +0200 |
| commit | ea346a785dc1b3f7c156f6fc33da634e1f1a627b (patch) | |
| tree | af67530553d20b6e82ad60fd79593e9c4abf5565 /misc/openlayers/examples/osm-grayscale.html | |
| parent | 59741cd535c47f25971bf8c32b25da25ceadc6d5 (diff) | |
| download | postrunner-ea346a785dc1b3f7c156f6fc33da634e1f1a627b.zip | |
Adding jquery, flot and openlayers to be included with the GEM.v0.0.4
Diffstat (limited to 'misc/openlayers/examples/osm-grayscale.html')
| -rw-r--r-- | misc/openlayers/examples/osm-grayscale.html | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/misc/openlayers/examples/osm-grayscale.html b/misc/openlayers/examples/osm-grayscale.html new file mode 100644 index 0000000..0ff3729 --- /dev/null +++ b/misc/openlayers/examples/osm-grayscale.html @@ -0,0 +1,77 @@ +<!DOCTYPE html> +<html> + <head> + <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"> + <meta name="apple-mobile-web-app-capable" content="yes"> + <title>OpenLayers Grayscale OSM Example</title> + <link rel="stylesheet" href="../theme/default/style.css" type="text/css"> + <link rel="stylesheet" href="style.css" type="text/css"> + <script src="../lib/OpenLayers.js"></script> + <script type="text/javascript"> + var map, layer; + + function init() { + if (!OpenLayers.CANVAS_SUPPORTED) { + var unsupported = OpenLayers.Util.getElement('unsupported'); + unsupported.innerHTML = 'Your browser does not support canvas, nothing to see here !'; + } + + layer = new OpenLayers.Layer.OSM('Simple OSM Map', null, { + eventListeners: { + tileloaded: function(evt) { + var ctx = evt.tile.getCanvasContext(); + if (ctx) { + var imgd = ctx.getImageData(0, 0, evt.tile.size.w, evt.tile.size.h); + var pix = imgd.data; + for (var i = 0, n = pix.length; i < n; i += 4) { + pix[i] = pix[i + 1] = pix[i + 2] = (3 * pix[i] + 4 * pix[i + 1] + pix[i + 2]) / 8; + } + ctx.putImageData(imgd, 0, 0); + evt.tile.imgDiv.removeAttribute("crossorigin"); + evt.tile.imgDiv.src = ctx.canvas.toDataURL(); + } + } + } + }); + + // If you get a security error because the tile are not + // from the same domain as this page, a simple Apache + // proxy can be created to workaround this issue: + // + // <Proxy *> + // Order deny,allow + // Allow from localhost + // </Proxy> + // ProxyPass /osm http://tile.openstreetmap.org/ + // + // Then, in the layer definition above, replace null with '/osm/${z}/${x}/${y}.png' + + map = new OpenLayers.Map('map', { + layers: [layer], + zoom: 3, + center: [-1081125, 6212801] + }); + } + </script> + </head> + <body onload="init()"> + <h1 id="title">Grayscale OSM Example</h1> + + <div id="tags"> + openstreetmap canvas grayscale light + </div> + + <div id="shortdesc">Show an OSM Map in grayscale</div> + + <div id="map" class="smallmap"></div> + + <div id="docs"> + <p>This example shows an OSM layer where the tiles were + converted to grayscale + with <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html">canvas</a>.</p> + <p style="color:red;" id="unsupported"></p> + </div> + + </body> +</html> |