scalebar minscale/maxscale enhancement

[woodbri@…]

I would like to see MINSCALE/MAXSCALE parameters added to the SCALEBAR object in
the mapfile, so it is possible to define SCALEBARs that can change the UNITs as
the user zooms in and out.

It makes more sense to have scalebar in MILES when you are view things at large
scales and FEET when you are zoomed in to street level.

[sdlime]

I'll consider (not a bad idea) it but this is probably a ways off from 
implementation given other priorities. There is a work around though you could 
employ using the CGI or MapScript. With just a bit of javascript and 
mode=scalebar you could change the scalebar units based on scale. Something 
like this could be used in a browse template:

<script language="javascript">
  var scale = [scale];
  var units = "miles"; // default scalebar units

  if(scale < 24000)
    units = "feet";

  document.write("<img src='/cgi-bin/mapserv?mode=scalebar&map=[map]&mapext
[mapext_esc]&map_scalebar_units=" + units + "'>");
</script> 

You may also have to pass the mapsize if the correct value is not being set in 
the mapfile. 

Granted this requires scripting but gets you the scale dependent map units.

Steve

[jnovak@…]

Dual scalebars in tick style

[jnovak@…]

Dual scalebars in filled style

[sdlime]

John: I don't suppose you still have the patch laying around? Marking for 5.2 on the off chance you do...

Steve

[sdlime]

Low priority, moving to 5.4 milestone.

Steve