Somehow deriving an AddPolygon() from a Live Search Collection

Somehow deriving an AddPolygon() from a Live Search Collection

• xRuntime

  John,

  Very interesting! I'm going to look at that more in depth when I get home. Thank you!

  Regards,

  Steve Erbach
  Neenah, WI
  http://TheTownCrank.blogspot.com

  
  

• DrScheme

  Derek,

  Yes, I saw that DrawPolygon enhancment! Very nice.

  Maybe I'll have to settle for that enhancement, though I just remembered: isn't there a function in the VE API that converts pixel position to LatLong I'm going to look that up...

  Regards,

  Steve Erbach
  Neenah, WI
  http://TheTownCrank.blogspot.com

  
  

• RTodd

  John,

  I looked at that Google Maps polyline utility and I think that might fill the bill for making a nice, accurate set of Lat/Long pairs. With those I can make the polygons I want on the VE site. Thanks for pointing that out.

  Regards,

  Steve Erbach
  Neenah, WI
  http://TheTownCrank.blogspot.com

  
  

• Steve Graber

  Derek,

  Ah! We'll have to see if it's fixed then, eh Thanks.

  Regards,

  Steve Erbach
  Neenah, WI
  http://TheTownCrank.blogspot.com

  
  

• Stephan Smetsers

  yes its an old depricated function known as pixeltoLatLong(). I know that causes errors on extremely high resolution and its been submitted as a bug
  
  

• 3456

  Well theres mapcruncher, although i haven't experimented with it yet, you can overlay a transparent image of what you want over the map.  Here's the link to help out:
  http://research.microsoft.com/mapcruncher/

  Also something to improve your tool: an article on how to preview the next point you draw, and act more like the maps.live.com version.
  
  http://viavirtualearth.com/wiki/DrawPolygon.ashx
  
  

  
  
  

• Jared2000

  No time to explain it this week but try this out:

  Use this utility to get the encoded string for your polygon:

  http://www.google.com/apis/maps/documentation/polylineutility.html

  and use it in VE like this:

  // Decode an encoded string into a list of VE lat/lng.

  function decodeLine(encoded) {

  var len = encoded.length;

  var index = 0;

  var array = [];

  var lat = 0;

  var lng = 0;

  try

  {

  while (index < len) {

  var b;

  var shift = 0;

  var result = 0;

  do {

  b = encoded.charCodeAt(index++) - 63;

  result |= (b & 0x1f) << shift;

  shift += 5;

  } while (b >= 0x20);

  var dlat = ((result & 1) ~(result >> 1) : (result >> 1));

  lat += dlat;

  shift = 0;

  result = 0;

  do {

  b = encoded.charCodeAt(index++) - 63;

  result |= (b & 0x1f) << shift;

  shift += 5;

  } while (b >= 0x20);

  var dlng = ((result & 1) ~(result >> 1) : (result >> 1));

  lng += dlng;

  array.push(new VELatLong((lat * 1e-5), (lng * 1e-5)));

  }

  } catch(ex)

  {

  //error in encoding.

  }

  return array;

  }

  function AddPolygons() //add the hardcoded polygon info to the map once on load.

  {

  var polyID = 0;

  var SatPoly = new Array();

  SatPoly.push("wlncF~slhVfC~bCo}AhRgIu~BxaBsV");

  SatPoly.push("wlncF~slhVv@{dBo`CpVfZ|dBxaBsV");

  for (var x=0; x<SatPoly.length; x++)

  {

  poly = new VEPolygon(polyID++,decodeLine(SatPoly[x]));

  poly.SetOutlineWidth(3);

  poly.SetOutlineColor(new VEColor(79, 64, 242, 1.0));

  poly.SetFillColor(new VEColor(79, 64, 242, 0.3));

  map.AddPolygon(poly);

  }

  }

  I'm tring to make some time to write this up nicely and maybe even do a VE version of the utility.

  John.

  
  
  

• ryan.rogers

  Steve,

  I've been so busy recently but set aside some time ot write up an article:

  http://www.soulsolutions.com.au/Articles/Encodingforperformance/tabid/96/Default.aspx

  John.

  
  
  
• Somehow deriving an AddPolygon() from a Live Search Collection