[mapserver-dev] MapServer pie chart enhancements

[Daniel Morissette]

Sounds like a great idea to me.


On 12-04-12 5:48 AM, thomas bonfort wrote:
> 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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>>> mapserver-dev at lists.osgeo.org
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>>>
>>
>>
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-- 
Daniel Morissette
http://www.mapgears.com/
Provider of Professional MapServer Support since 2000