LatLong calculated with PixelToLatLong varies from e.view.LatLong

LatLong calculated with PixelToLatLong varies from e.view.LatLong

• Thibaud

  Getting the accurate pixel location has been causing me problems. In a recent demo for drawing accurate polygons using the crosshair we had to actually correct the value by 1 pixel up and 3 pixels right for IE. (try it in local.live.com) We also had to use a more generic function to get the top and left position of the map div, listed below.
  John.
  
  var mapleft = 0;
  var maptop = 0;
  
  function SetMapOffsets(obj) {
  if (obj.offsetParent) {
  mapleft = obj.offsetLeft
  maptop = obj.offsetTop
  while (obj = obj.offsetParent) {
  mapleft += obj.offsetLeft
  maptop += obj.offsetTop
  }
  }
  }
  
  //usage
  function GetMap()
  {
  map = new VEMap('MapDiv');
  map.LoadMap(new VELatLong(-27, 152), 5 ,'r' ,false);
  SetMapOffsets(document.getElementById("MapDiv"));
  }
  
  
  

• rwerner

  Thanks John!

  Just to wrap this up, I now use the following to get my LatLong (based upon John's code above):

  latlong = map.PixelToLatLong(event.clientX - mapleft, event.clientY - maptop)

  
  
• LatLong calculated with PixelToLatLong varies from e.view.LatLong