[Gvsig_english] Configuration for desktop during creation, of shapefiles

[Simon Cropper (Botanicus Australia Pty Ltd)]

Sergio,

(please note that I eventually solved the problem as I was preparing 
this reply but thought others may find the information collated useful)

I have tinkered with the alpha value for the 
'Preferences/Editing/Selection Color' but still get the problem.

I will explain what I am doing so you can reproduce...

1. I open an ECW file in the correct project - in this case EPSG:28355.
2. View/New Layer/New SHP then choose to create a polygon, add a field 
(use default) then save to local directory... The screen shutters and 
the image is redrawn when the command box appears.
3. I choose the toolbar button for 'Autocomplete polygon' and draw an 
irregular polygon. With the alpha property set as you suggested (and how 
I actually had it set) I can see the underlying imagery. This is expected.
4. Now I want to change the position of one of the borders because, say, 
I was sloppy at the outset and missed a fenceline...

- note, the following I discovered through trial and error as I could 
not find anything in the manual or online documentation about moving a 
vertex.

5. So, I click on the 'Selection' button on the toolbar click on the 
vertex I want to move -- the polygon is still transparent and nothing 
appears to happen.
6. You click again on the vertex you want to edit and the polygon goes 
grey and the vertex is 'stuck' to the mouse and  you are able to see 
where you are moving the boundary in real time. At this point the 
polygon is grey and opaque so the only way to see the underlying imagery 
and the feature you wish to align the border to is pull it back to 
expose the feature then place the vertex accordingly. The problem is 
that when you have a complex series of joined polygons with a common 
vertex you can not see any of the underlying features.
7. Once vertex is moved to the correct position, the mouse is clicked. 
The polygon is now yellow and opaque, obscuring the underlying imagery. 
Assuming you adjusted the alpha of the layer through the symbol 
selector, the only way to see through the polygon is select something else.

OK I have played around with 'Preferences/Editing' settings and managed 
to get the 'grey polygon' to be transparent (step 6) but can't stop the 
polygon from becoming opaque yellow when selected. I have changed the 
Alpha value of 'Default Selection Color' in the Preferences/View dialog 
box but nothing happened regardless of whether I am editing the 
shapefile or not.

The solution to this problem is that in order to get the 'Default 
Selection Color' to change you need to restart gvSIG. Once this was done 
and I repeated the above steps and all worked as expected.

Thanks Sergio for your help.

Simon

*** YOUR REPLY ****

Date: Wed, 18 Nov 2009 19:17:40 +0100
From: Sergio Clark <sergio.clark at iver.es>
Subject: Re: [Gvsig_english] Configuration for desktop during creation
	of shapefiles
To: Users and Developers mailing list
	<gvsig_internacional at listserv.gva.es>
Message-ID: <4B043A44.3020001 at iver.es>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi Simon,

There are different color settings in the Preferences. In your case, I 
think you should change the Alpha in Preferences/Editing/Selection 
color, not that one inside /Symbology or /View. Is this what you have tried?

Regards,
Sergio.


Sergio Clark
Equipo gvSIG
IVER T.I., S.A.
www.iver.es
www.gvsig.com



Simon Cropper (Botanicus Australia Pty Ltd) escribi?:

> > Hi Guys,
> >
> > My name is Simon and I am new to this list. I hope that my posting is 
> > appropriately formatted and has been sent to the right place.
> >
> > I am a new user but experienced in using GIS software (ArcView, 
> > OpenJUMP, JUMP, Kosmos, Quantum).
> >
> > I am using the latest stable release (version 1.9).
> >  
> > I am trying to create a shapefile using ECW files as background. I find 
> > however that the polygons when selected become opaque despite settings 
> > in the preferences. I am keen to get the polygon being edited to be 
> > transparent so I can add and adjust the position of  a particular vertex 
> > using the imagery as a guide.
> >   
>   

-- 

Cheers Simon

Simon Cropper
Botanicus Australia Pty Ltd
PO Box 160, Sunshine, Victoria 3020.
P: 9311 5822. M: 041 830 3437.
mailto: scropper at botanicusaustralia.com.au 
<mailto:scropper at botanicusaustralia.com.au>
web: www.botanicusaustralia.com.au <http://www.botanicusaustralia.com.au>