tsauerwein/image-layer.html

## image-layer.html
<!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 Image Layer Example</title>
    <link rel="stylesheet" href="http://openlayers.org/dev/theme/default/style.css" type="text/css">
    <link rel="stylesheet" href="http://openlayers.org/dev/examples/style.css" type="text/css">
    <style type="text/css">
        p.caption {
            width: 512px;
        }
    </style>
    <script src="http://openlayers.org/dev/OpenLayers.js"></script>
    <script type="text/javascript">
        var map;
        function init(){
            map = new OpenLayers.Map('map');

            var graphic = new OpenLayers.Layer.Image(
                'City Lights',
                '4_m_citylights_lg.gif',
                new OpenLayers.Bounds(-180, -88.759, 180, 88.759),
                new OpenLayers.Size(580, 288),
                {
                    numZoomLevels: 3,
                    eventListeners: {
                        loadend: function(evt) {
                            var tile = evt.object.tile;
                            var ctx = tile.getCanvasContext();

                            if (ctx) {
                                var imgd = ctx.getImageData(0, 0, tile.size.w, 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);
                                tile.imgDiv.removeAttribute("crossorigin");
                                tile.imgDiv.src = ctx.canvas.toDataURL();
                            }
                        }
                    }
                }
            );

            graphic.events.on({
                loadstart: function() {
                    OpenLayers.Console.log("loadstart");
                },
                loadend: function() {
                    OpenLayers.Console.log("loadend");
                }
            });

            var jpl_wms = new OpenLayers.Layer.WMS(
                "Global Imagery",
                "http://demo.opengeo.org/geoserver/wms",
                {layers: "bluemarble"},
                {maxExtent: [-160, -88.759, 160, 88.759], numZoomLevels: 3}
            );

            map.addLayers([graphic, jpl_wms]);
            map.addControl(new OpenLayers.Control.LayerSwitcher());
            map.zoomToMaxExtent();
        }
    </script>
  </head>
  <body onload="init()">
    <h1 id="title">Image Layer Example</h1>

    <div id="tags">
        image, imagelayer
    </div>

    <p id="shortdesc">
        Demonstrate a single non-tiled image as a selectable base layer.
    </p>

    <div id="map" class="smallmap"></div>

    <div id="docs">
        <p class="caption">
            The "City Lights" layer above is created from a single web accessible
            image.  If you construct it without any resolution related options,
            the layer will be given a single resolution based on the extent/size.
            Otherwise, it behaves much like a regular layer.  This is primarily
            intended to be used in an overview map - where another layer type
            might not make a good overview.
        </p>
    </div>
  </body>
</html>
	<!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 Image Layer Example</title>
	<link rel="stylesheet" href="http://openlayers.org/dev/theme/default/style.css" type="text/css">
	<link rel="stylesheet" href="http://openlayers.org/dev/examples/style.css" type="text/css">
	<style type="text/css">
	p.caption {
	width: 512px;
	}
	</style>
	<script src="http://openlayers.org/dev/OpenLayers.js"></script>
	<script type="text/javascript">
	var map;
	function init(){
	map = new OpenLayers.Map('map');

	var graphic = new OpenLayers.Layer.Image(
	'City Lights',
	'4_m_citylights_lg.gif',
	new OpenLayers.Bounds(-180, -88.759, 180, 88.759),
	new OpenLayers.Size(580, 288),
	{
	numZoomLevels: 3,
	eventListeners: {
	loadend: function(evt) {
	var tile = evt.object.tile;
	var ctx = tile.getCanvasContext();

	if (ctx) {
	var imgd = ctx.getImageData(0, 0, tile.size.w, 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);
	tile.imgDiv.removeAttribute("crossorigin");
	tile.imgDiv.src = ctx.canvas.toDataURL();
	}
	}
	}
	}
	);

	graphic.events.on({
	loadstart: function() {
	OpenLayers.Console.log("loadstart");
	},
	loadend: function() {
	OpenLayers.Console.log("loadend");
	}
	});

	var jpl_wms = new OpenLayers.Layer.WMS(
	"Global Imagery",
	"http://demo.opengeo.org/geoserver/wms",
	{layers: "bluemarble"},
	{maxExtent: [-160, -88.759, 160, 88.759], numZoomLevels: 3}
	);

	map.addLayers([graphic, jpl_wms]);
	map.addControl(new OpenLayers.Control.LayerSwitcher());
	map.zoomToMaxExtent();
	}
	</script>
	</head>
	<body onload="init()">
	<h1 id="title">Image Layer Example</h1>

	<div id="tags">
	image, imagelayer
	</div>

	<p id="shortdesc">
	Demonstrate a single non-tiled image as a selectable base layer.
	</p>

	<div id="map" class="smallmap"></div>

	<div id="docs">
	<p class="caption">
	The "City Lights" layer above is created from a single web accessible
	image. If you construct it without any resolution related options,
	the layer will be given a single resolution based on the extent/size.
	Otherwise, it behaves much like a regular layer. This is primarily
	intended to be used in an overview map - where another layer type
	might not make a good overview.
	</p>
	</div>
	</body>
	</html>