User:Kerik Rau

SLURL Raster Image URL Generator

I was rather interested in the raster images provided within SL and SLURL.com so I decided to figure out how to replicate it in such a way that it could be incorporated into tools and/or services outside the standard fair offered by Linden Labs. At some point I may rewrite it to use PHP or offer tips to incorporate it into something like the WMS provider in MapGuide.

LSL

<lsl> //SLURL Tile URL Generator - By Kerik Rau

//Based on the javascript from SLURL.com, mearly an adaptation in LSL //It should only take a minute or 2 to export this into PHP or other languages

//SLURL uses WMS, I still want to look at incorperating it into something like Mapguide //I will need to look at the implementation to see if this would be easy or a pain

vector genTileVec(vector RegPos) {

   //tiles are in a grid based on the regions, so 256m = 1 tile
   RegPos /= 256.0;
   
   //offset provided in the javascript, really 1278 + 1 (probably 0 -> 1 index difference?)
   RegPos.y = 1279.0 - RegPos.y;

   return RegPos;

}

string genMapURL() {

   vector TilePos = genTileVec(llGetRegionCorner());
   
   //should look like http://secondlife.com/apps/mapapi/grid/map_image/x-y-zoom-0
   string mapURL = "http://secondlife.com/apps/mapapi/grid/map_image/";
   mapURL += (string) llFloor(TilePos.x);
   mapURL += "-";
   mapURL += (string) llFloor(TilePos.y);
   
   //the 3rd value is something to do with zoom, but only 1 seems to work with this
   //the 4th value is undefined, omitting it works but I leave it in to match SLURL
   mapURL += "-1-0";
   return mapURL;

}

default {

   state_entry()
   {
       llSetText("SLURL Raster Image URL Generator\nOpens the image of the current sim\n(in a browser)", <1,1,1>, 1);
   }
   
   touch_start(integer numdet)
   {
       integer i;
       for(i = 0; i < numdet; ++i)
           llLoadURL(llDetectedKey(i), "load this page to see the sim image", genMapURL());
       
   }

}

</lsl>