topic Re: Show scale with coordinates in ArcGIS Viewer for Flex Questions

Show scale with coordinates

DanielOchoa — Wed, 23 Feb 2011 23:19:44 GMT

The coordinate widget shows lat/long mouseover coordinates in the map, but can anyone advise on how to display map scale alongside the coordinates? Take a look here:

http://top100projects.ca/map/

or see the screen shot, attached.

Simple adjustment to the coordinate widget? Thanks!

Re: Show scale with coordinates

RobertScheitlin__GISP — Sun, 12 Dec 2021 16:23:36 GMT

Daniel,

Try this in the CoordinateWidget.mxml

            private function map_mouseMoveHandler(event:MouseEvent):void
            {
                const mapPoint:MapPoint = map.toMapFromStage(event.stageX, event.stageY);
                coords.text = m_func(mapPoint) + " Scale 1:" + map.scale.toString();
            }

Re: Show scale with coordinates

DanielOchoa — Thu, 24 Feb 2011 16:19:12 GMT

Rob,

That worked - thanks! But its showing the scale in meters (e.g. 1:14567789.232567) instead of something like 1: 12,456,578 . Can you guide me as to what part of the code needs to change to have the scale show as standard instead of metric? Once again, you rock!

thanks,

~ D

Re: Show scale with coordinates

RobertScheitlin__GISP — Thu, 24 Feb 2011 16:24:57 GMT

Daniel,

The scale will be whatever the map's spatial reference is set to so if you are using ESRI basemaps than the map's SR is like web mercator which is meters. I guess you could do some standard math and convert meters to feet if that is what you are asking...

Re: Show scale with coordinates

DanielOchoa — Thu, 24 Feb 2011 16:35:07 GMT

The scale will be whatever the map's spatial reference is set to

Yea, I figured that might be the case, but I was wondering if there was a way in the code to force the output to show something different. I'm still new at this, so I didnt know if you could adjust something under the map_loadHandler to reflect a different format.

But the "standard math" option sounds interesting...is there a way to code some conversion math into the coordinate mxml and compile so I can get what I'm looking for?

Thanks again for the education....

Re: Show scale with coordinates

RobertScheitlin__GISP — Sat, 11 Dec 2021 17:15:21 GMT

Daniel,

Sure something like this:

            private function map_mouseMoveHandler(event:MouseEvent):void
            {
                const mapPoint:MapPoint = map.toMapFromStage(event.stageX, event.stageY);
                coords.text = m_func(mapPoint) + " Scale 1:" + String(map.scale * 3.2808398950131235);
            }

I can never remember if the right calculation is multiple or divide though.:o

Re: Show scale with coordinates

SteveWhitehead__GISP — Sun, 27 Feb 2011 04:39:25 GMT

This is good.

How do I remove the dozen or so decimal places in the scale?

Re: Show scale with coordinates

RobertScheitlin__GISP — Sat, 11 Dec 2021 17:15:24 GMT

Steve,

Just add a numberformatter.

   private function map_mouseMoveHandler(event:MouseEvent):void
   {
    var nf:NumberFormatter = new NumberFormatter();
    nf.precision = 2;
    const mapPoint:MapPoint = map.toMapFromStage(event.stageX, event.stageY);
    coords.text = m_func(mapPoint) + " Scale 1:" + nf.format(map.scale * 3.2808398950131235);
   }

Re: Show scale with coordinates

SteveWhitehead__GISP — Sat, 11 Dec 2021 17:15:26 GMT

Thank you!

Steve,

Just add a numberformatter.

   private function map_mouseMoveHandler(event:MouseEvent):void
   {
    var nf:NumberFormatter = new NumberFormatter();
    nf.precision = 2;
    const mapPoint:MapPoint = map.toMapFromStage(event.stageX, event.stageY);
    coords.text = m_func(mapPoint) + " Scale 1:" + nf.format(map.scale * 3.2808398950131235);
   }

Re: Show scale with coordinates

philippschnetzer — Tue, 08 Mar 2011 13:32:30 GMT

include this code:

map.addEventListener(MouseEvent.MOUSE_WHEEL, map_mouseMoveHandler);

directly under this line:

map.addEventListener(MouseEvent.MOUSE_MOVE, map_mouseMoveHandler);

and the scale will refresh when you zoom in and out. Otherwise it is possible to zoom in and out and not have the scale refresh until you actually move the mouse pointer....

Re: Show scale with coordinates

Stefanobruscoli — Mon, 14 Mar 2011 11:12:07 GMT

Hello
how I can fix the coodinates values to two decimal?

Re: Show scale with coordinates

RobertScheitlin__GISP — Mon, 14 Mar 2011 12:07:00 GMT

Stefano,

Look three posts above yours.

Re: Show scale with coordinates

EricAnderson — Sat, 11 Dec 2021 17:15:29 GMT

To specifically address the coordinate display issue (not scale). Replace your substitute function with this:

 
private


function substitute(mapPoint:MapPoint):String


 
[LEFT]{

var nf2:NumberFormatter = new NumberFormatter(); 

nf2.precision = 2; 
return StringUtil.substitute(m_template, 
nf2.format(mapPoint.x), 
nf2.format(mapPoint.y)); 
}

[/LEFT]

Re: Show scale with coordinates

KennethLyons — Wed, 18 Jan 2012 13:58:06 GMT

Is there anyway to display MGRS (Military Grid Reference System) at the bottom instead of DMS/mercator?

Re: Show scale with coordinates

MLowry — Thu, 19 Jan 2012 13:40:59 GMT

Is there anyway to display MGRS (Military Grid Reference System) at the bottom instead of DMS/mercator?

Sure, the scale will be whatever the map's spatial reference is set to.

Re: Show scale with coordinates

ShaneCarey — Wed, 25 Jul 2012 14:49:50 GMT

Is it possible to force the scale on the Coordinates widget to the same scale on the LODs on the Navigation widget?
Thanks

Re: Show scale with coordinates

RhettZufelt — Sat, 11 Dec 2021 17:15:32 GMT

include this code:
map.addEventListener(MouseEvent.MOUSE_WHEEL, map_mouseMoveHandler);
directly under this line:
map.addEventListener(MouseEvent.MOUSE_MOVE, map_mouseMoveHandler);
and the scale will refresh when you zoom in and out. Otherwise it is possible to zoom in and out and not have the scale refresh until you actually move the mouse pointer....

Works great, however also added this line under that

map.addEventListener(MouseEvent.DOUBLE_CLICK, map_mouseMoveHandler);

so that it gets updated on double-click to zoom in also.

R_

Re: Show scale with coordinates

RhettZufelt — Mon, 30 Jul 2012 23:08:32 GMT

Is it possible to force the scale on the Coordinates widget to the same scale on the LODs on the Navigation widget?
Thanks

My LODs are set by loading in a tiled service as a basemap.

the Scale displays exactly the LOD for the cached zoom level I am currently viewing.

R_

Re: Show scale with coordinates

ronaldmcfarlane — Sat, 11 Dec 2021 17:15:35 GMT

Daniel,

Sure something like this:

            private function map_mouseMoveHandler(event:MouseEvent):void
            {
                const mapPoint:MapPoint = map.toMapFromStage(event.stageX, event.stageY);
                coords.text = m_func(mapPoint) + " Scale 1:" + String(map.scale * 3.2808398950131235);
            }

I can never remember if the right calculation is multiple or divide though.:o

While this is a great example of incorporating code to modify output, you don't want to do this. The scale shown is "Representative Fraction" scale which is not based upon a specific unit of measure. By this I mean an RF scale of 1:100 is the same regardless of how you care to measure it; 1 in represents 100 inches or 1 meter represents 100 meters. To convert the result displayed means you would need to add additional text so it would read "1 meter represents xx yards".

Re: Show scale with coordinates

JamalNUMAN — Sat, 11 Dec 2021 17:15:37 GMT

Daniel,

Try this in the CoordinateWidget.mxml

            private function map_mouseMoveHandler(event:MouseEvent):void
            {
                const mapPoint:MapPoint = map.toMapFromStage(event.stageX, event.stageY);
                coords.text = m_func(mapPoint) + " Scale 1:" + map.scale.toString();
            }

Hi Robert,

Could you please indicate where should I stick this code? I have no idea!

[ATTACH=CONFIG]20348[/ATTACH]

Thanks

Jamal