Using WMS layers with j2memap library….
Thursday, May 24th, 2007In the latest release of J2memap library, a new interface has been defined: MapCustomOverlay
If you create a class that implements MapCustomOverlay, you will have the ability to dsiplay new layers on top of an existing map.
The implementation is easy, there are two methods:
String getTileURL(int x,int y,int z,int sizeSq,boolean isSat);
and
public boolean isTransparent();
The last one just have to return true if transparent, or false otherwhise. The getTitleUrl must return to URL of a tile to be loaded at the corresponding x,y positions. sizeSq is the size of a square, usually 256, while isSat is true if the user is currently displaying a satellite image.
To convert x “pixels values” into longitude, you can use MapCanvas.LonFromX() and MapCanvas.LatFromY() for y value.
To display this layer, call the setOverlay(MapCustomOverlay) function (with null parameter to remove it). Just one overlay can be displayed at a time.
This can be used to easily create WMS overlay, if you know the URL of a WMS server.
Latest question, is: great, but what happens if I do not want to program and I want to be able to display a custom layer? Well, something good is coming, but if you want to test it, just drop me an email
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