[GRASS-dev] Re: gui_modules/colorrules.py bug and wishes (Markus Neteler)

[Michael Barton]

On Oct 28, 2009, at 8:17 AM, Michael Barton wrote:

>
>
> On Oct 28, 2009, at 2:23 AM, grass-dev-request at lists.osgeo.org wrote:
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>>  1. gui_modules/colorrules.py bug and wishes (Markus Neteler)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Wed, 28 Oct 2009 10:22:37 +0100
>> From: Markus Neteler <neteler at osgeo.org>
>> Subject: [GRASS-dev] gui_modules/colorrules.py bug and wishes
>> To: GRASS developers list <grass-dev at lists.osgeo.org>
>> Message-ID:
>> 	<86782b610910280222re95a0d5yb2f464499d3ab653 at mail.gmail.com>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Hi,
>>
>> trying "volors" (i.e., gui_modules/colorrules.py) I found small bug
>> and
>> got a few ideas to improve this promising dialog.
>> Please see attached screenshot as I found it easier to indicate the
>> ideas there.
>>
>> Those which aren't easy to fix I'll submit later as tickets.
>>
>> thanks
>> Markus
>
> Hi Markus,
>
> Interesting. The bug you've found is not the one you think you  
> found ;-)
>
> Both menu items "color rules" and "color tables" under vector->manage
> colors are bringing up the same color rules module from wxGUI.
> Instead, "color tables" should be bringing up the interface for the
> new v.colors GRASS module. I suspect it's just a typo in the menu
> string.
>
> The vector color rules module does not do what you are assuming it
> does. That is, it does not automatically spread a color gradient
> between a max and min value. What it does is allow you to custom set
> colors to individual values or ranges of values, and store these
> colors in the GRASSRGB color column. The add column button may not be
> too hard to implement (automatically refreshing the column list may be
> the biggest headache). The other suggestions don't match this module.
> This module was written before v.colors and has different  
> functionality.
>
> The functions you thought were in the color rules wxGUI module are
> actualy in the v.colors GRASS module. The "color tables" menu option
> ought to call this module. It automatically sets max and min, but also
> allows the user to set custom max/min. It then lets you pick a color
> table and automatically assign the color gradients to the vector  
> values.
>
> I'll try to get this fixed when I get to my office today. Hopefully
> it's a simple typo.
>
> Michael

I just tried this at work and the menu items are working correctly  
(finally had sufficient coffee?).

Anyway, "color tables" launches v.colors which allows you to do a  
color gradient from max to min, using any of the known raster color  
tables; "color rules" allows you to manually specify colors for  
specific vector attribute values or value ranges.

Michael