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<html> |
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<head> |
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<style type="text/css"> |
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#map { |
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width: 500px; |
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height: 300px; |
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border: 1px solid gray; |
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} |
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p.caption { |
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width: 500px; |
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} |
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</style> |
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<script src="../lib/OpenLayers.js"></script> |
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<script type="text/javascript"> |
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OpenLayers.IMAGE_RELOAD_ATTEMPTS = 2; |
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var map; |
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window.onload = function() { |
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options = {maxExtent: new OpenLayers.Bounds(-73.5295, 41.2318, |
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-69.9097, 42.8883), |
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maxResolution: 0.0003} |
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map = new OpenLayers.Map('map', options); |
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var roads15 = new OpenLayers.Layer.WMS( "Roads (15px gutter)", |
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"http://boston.freemap.in/cgi-bin/mapserv?map=/www/freemap.in/boston/map/gmaps.map&", |
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{layers: 'roads_200_40'}, |
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{gutter: 15}); |
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var roads = new OpenLayers.Layer.WMS( "Roads (no gutter)", |
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"http://boston.freemap.in/cgi-bin/mapserv?map=/www/freemap.in/boston/map/gmaps.map&", |
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{layers: 'roads_200_40'}); |
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map.addLayers([roads, roads15]); |
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map.addControl(new OpenLayers.Control.LayerSwitcher()); |
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map.setCenter(new OpenLayers.LonLat(-71.848, 42.2), 0); |
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} |
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</script> |
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</head> |
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<body> |
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<h1>OpenLayers Gutter Example</h1> |
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<div id="map"></div> |
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<p class="caption"> |
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When you render tiles with certain types of symbols, there are artifacts |
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at tile edges that make symbology not look continuous. In the center of |
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the above map (when it first loads), the large orange road is split |
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vertically by a tile. Open the layer switcher and change to the layer |
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with a 15 pixel gutter to see how the symbology looks nicer. |
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</p> |
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|
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</body> |
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</html> |
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