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Open Street Maps and Google Maps APIs
Both, Google Maps API and Open Layers API, are quite simple, though it can take some time to find a perfect example. The maps are added to the WebGL panorama view test page (read “Experimenting with WebGL panoramas”)
Description
The maps are embedded, so the sources are available.
There is a *.kml file with the points’ records that is read with PHP and the coordinates are passed to _javascript_. Then the points/markers are placed on maps. Markers’ events are:
- ‘click’ – setting the current position
- ‘mouseover’/'mouseout’ – highlighting
Notes
OpenLayers Library
- Possible to have a Google Maps layer
- Currently Markers Overlays are used (found first) but they are old and there are more advanced and better Vectors Overlays. For more info please visit this page.
- Markers Overlays: didn’t find how to change the icon properties of a created marker except url – to change an icon to a different sized one – the marker is removed and recreated.
- Markers Overlays: markers over Open Street Map being initialized and placed with correctly return wrong coordinates (not used but anyway).
- Vectors Overlays: can’t display vectors over Open Street Map Layer so far.
- Vectors Overlays: haven’t tried events.
Google Maps API
- Need to generate a unique key for each particular website.
- Didn’t find how to change the icon properties of a created marker except url – to change an icon to a different sized one – the marker is removed and recreated.
Some PHP
function parse_kml_file($kmlFile){
if (!is_file($kmlFile)) return -1;
$kml_contents = simplexml_load_file($kmlFile);
//Document, PhotoOverlay, Camera, Icon, href, longitude & latitude are KML tags
$PhotoOverlay = $kml_contents->Document->PhotoOverlay;
$marker=array();
$i=0;
foreach($PhotoOverlay as $element) {
$marker[$i]['longitude'] = $element->Camera->longitude;
$marker[$i]['latitude'] = $element->Camera->latitude;
$marker[$i]['href'] = $element->Icon->href;
$i++;
}
return $marker;
}
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