[mapserver-users] Scale Bar Size Issue

[PatB]

The image size will vary because of the length of the last callout under the
bar, right?  100000 km will stick out past the bar farther than 5000 m.  I
guess I could eyeball how much based on the font size, number of characters
and ouput dpi but, well, bleach.  Is there a better way?  Plan B is to make
my own scalebar but I'm not wild about that idea either.

Engineers all over the world just cringed when I wrote 'eyeball'.

Thanks.


Steve Lime wrote:
> 
> When you set a size for a scalebar the width you provide is what you get
> back. The height is for
> the bar only. This was done so that scalebar images could retain the same
> image size and you 
> could just swap img.src in a web app (assuming you're not mucking with
> font sizes). You'll likely
> have to experiment a bit with the width then to get it roughly the right
> size (e.g ask for 750).
> 
> Steve
> 
>>>> On 9/24/2009 at 11:04 PM, in message
> <1253851467382-3710334.post at n2.nabble.com>, PatB
> <pbarnhart at gis-services.com>
> wrote:
> 
>> Hi,
>> 
>> I'm using the code below to request a scalebar from mapserver.  My
>> understanding of the documentation is that the size parameter sets the
>> size
>> of the scalebar itself not including the text, border, etc but that's not
>> what I'm getting back.  The url below returns an image that is 600 x 153
>> (I'm requesting 600 x 75) when it should be more like 750 x 153 to
>> account
>> for the surrounding stuff.  The height works as expected and the
>> units/distances look right, the width of the scalebar itself is the
>> issue.
>> 
>> This is for a print app, the output res is 300dpi so by setting the width
>> to
>> 600 I was hoping to print a 2 inch wide scale bar with four 1/2"
>> intervals. 
>> This seems like it would be a common task but I've been digging though
>> the
>> forum for hours without success.  A little help?  I'm using MS version
>> 5.4.2
>> 
>> mapserv.exe?MAP=C:/ms4w/tmp/maps/mp.map&mode=scalebar&mapext=-8798233+4184184+-8
>> 793280+4188502&mapsize=11700+10200&map.scalebar=units+feet+size+600+75+interval
>> s+4+label+size+40+end
>> 
>> and my map file goes something like:
>> 
>> MAP
>> ...
>> UNITS meters
>> ...
>> SCALEBAR
>>   STYLE 0
>>   IMAGECOLOR 255 255 255
>>   LABEL
>>     TYPE TRUETYPE
>>     FONT "tahoma"
>>     SIZE 40
>>     COLOR 0 114 255
>>   END
>>   SIZE 600 75
>>   COLOR 235 235 235
>>   BACKGROUNDCOLOR 0 114 255
>>   OUTLINECOLOR 0 0 0
>>   UNITS meters
>>   INTERVALS 4
>>   STATUS on
>>   TRANSPARENT on
>> END
>> ...
>> 
>> Thanks - and yes, the map size is friggin huge.
> 
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