[mapserver-dev] MapServer pie chart enhancements

[thomas bonfort]

I'm fine with the changes, add when you please...

--
thomas

On Wed, Apr 11, 2012 at 23:30, Lime, Steve D (DNR)
<Steve.Lime at state.mn.us> wrote:
> Seems a relatively straightforward addition to me.  I’d be ok with the
> addition…
>
>
>
> Steve
>
>
>
> From: mapserver-dev-bounces at lists.osgeo.org
> [mailto:mapserver-dev-bounces at lists.osgeo.org] On Behalf Of Tamas Szekeres
> Sent: Wednesday, April 11, 2012 2:12 PM
> To: thomas bonfort
> Cc: mapserver-dev at lists.osgeo.org
> Subject: Re: [mapserver-dev] MapServer pie chart enhancements
>
>
>
> Hi Thomas,
>
>
>
> I would just use 3 specific functions (linear, sqrt, log) as the possible
> values of   CHART_SIZE_FUNCTION
>
>
>
> Best regards,
>
>
>
> Tamas
>
>
>
>
>
> 2012/4/11 thomas bonfort <thomas.bonfort at gmail.com>
>
> Hi Tamas,
> How would you express this in a pseudo-generic way inside the
> processing keys? Are there any other functions that would make sense
> here?
>
> --
> thomas
>
>
> On Wed, Apr 11, 2012 at 20:14, Tamas Szekeres <szekerest at gmail.com> wrote:
>>
>> Hi Devs,
>>
>> One of our client requires an addition which could provide nonlinear
>> function to visualize the size of the pies depending on the source
>> attribute. Currently we can specify the chart size as follows:
>>
>> PROCESSING "CHART_SIZE_RANGE = itemname minsize maxsize minval maxval"
>>
>> This can provide the size as linear function of the item value. As an
>> enhancement we would like to add further kind of functions (like square
>> root
>> or logarithm) to enhance the visual appearance (see the images attached).
>>
>> This addition could be implemented by introducing a new processing option
>> (like: CHART_SIZE_FUNCTION ) and by adding a switch to the size
>> calculation
>> in mapchart.c.
>>
>> For example with the square root function we could use:
>>
>> diameter=MS_NINT(
>> mindiameter+
>> (sqrt((diameter-minvalue))/sqrt((maxvalue-minvalue)))*
>> (maxdiameter-mindiameter));
>>
>>
>> What do you think about this change?
>>
>>
>> Best regards,
>>
>> Tamas
>>
>>
>>
>
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>
>