Re: [Qgis-developer] new geom function: combine cascaded

[vinayan]

I have been away from the developement for some time, you will need to
check with Marco/Nathan who knows better

On Thu, Dec 17, 2015 at 10:23 AM, lewisvillierme [via OSGeo.org] <
ml-node+s1560n5241707...@n6.nabble.com> wrote:

> Is this function was implemented yet in recent version ?
>
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> NAML
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Re: [Qgis-developer] Add yourself to the QGIS Contributor Map

[vinayan]

Borys,

>From a little investigation, it seems,

First Commit: 10-Nov-2008
commit message - "Plugin Installer update: inclusion to i18n git-svn-id:
"


I got it from ohloh, I think it is somewhat correct
https://www.ohloh.net/p/3663/contributors?query=&sort=commits



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[Qgis-developer] IRC issue

[vinayan]

Hello,

Sigq has brought all his brothers to irc channel .. pls take care of them..



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Re: [Qgis-developer] new icons

[vinayan]

Hi Denis,

It was great work on some of the icons you did recently(particularly the add
layer icons)..

I am on the side of replacing the topology checker icon..I did that while
playing with Inkscape :)
please consider it if you have time..



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Re: [Qgis-developer] [Plugin presentation] LayerCombination

[vinayan]

Hi Olivier,

Really nice feature..Reminded me of the layer filters in AutoCAD..



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Re: [Qgis-developer] Active iterator errors

[vinayan]

Hi Nathan,

Nice to see this bug finally got killed. It has been bullying us for quite
some time now :)



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Re: [Qgis-developer] editing problems

[vinayan]

This is the most alarming bug at the moment..It would be great if someone can
fix it soon..I took a dig at it myself and seems to be beyond my skills..



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Re: [Qgis-developer] the May 4th bug report

[vinayan]

Hi Paolo,

I have been picking up bugs from ftools category. Hope to continue on this.

Thanks
Vinayan



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[Qgis-developer] Union Tool - Ftools/Sextante - How should the real result be?

[vinayan]

Hi,

At present the union tool does not give correct results in sextante/ftools.
After looking at some bug reports, I feel that even in QGIS 1.8, the union
tool was not producing the correct output either attribute-wise or
geometry-wise.

My question is how should the real output be? I have two cases here.

1. Union of a single layer against itself  - 
https://www.dropbox.com/sh/asicnvr71vxeaz2/TKVUpdleIX#f:singleLayerInput.png
2. Union between two different layers -
https://www.dropbox.com/sh/asicnvr71vxeaz2/TKVUpdleIX?lst#f:twoLayerInput.png


It looks to me that for case 1, the result could be like below(11 geometries
in total)
https://www.dropbox.com/sh/asicnvr71vxeaz2/TKVUpdleIX?lst#f:singleLayerResult1.png

and for case 2, the result could be like below 
https://www.dropbox.com/sh/asicnvr71vxeaz2/TKVUpdleIX?lst#f:twoLayerResult1.png

what do you think? Anybody knows how it looked in 1.8?

Thanks
Vinayan



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Re: [Qgis-developer] Logo Update

[vinayan]

I like 413..It should look good on desktop too..in fact all designs from
412-420 are nice



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Re: [Qgis-developer] restoring geometry from postgis

[vinayan]

Hi Denis,

The QuickWKT plugin contains useful code that converts EWKB to QgsGeometry.
>From this long wkb textstring, we will need to decode the geometry
type,coordinate system and geometry data. That is what I understood
referring it here..

https://github.com/elpaso/quickwkt/blob/master/QuickWKT.py#L144

Thanks
Vinayan



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Re: [Qgis-developer] fTools and GdalTools: sextante vs original plugins

[vinayan]

+1 for keeping the vector menu.

I think it is best to have maximum algorithms available in c++ ap,  in the
analysis module(i see that some are already available)..I would be willing
to contribute to it if required

thanks
Vinayan



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Re: [Qgis-developer] How to see log/debug messages in Osgeo4W installer(qgis-dev)

[vinayan]

Hi Jef,

It really worked. DebugView is really cool. Thank you!

regards
Vinayan



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Re: [Qgis-developer] How to see log/debug messages in Osgeo4W installer(qgis-dev)

[vinayan]

Hi Tim,

It caused a crash when i started the application. It created an empty log
though in the specified log path.
I was hoping there would be a live console



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[Qgis-developer] How to see log/debug messages in Osgeo4W installer(qgis-dev)

[vinayan]

Hi,

I have an osgeo4w installed Qgis 1.9 in windows xp. Is there any way i can
see the log console?

When i used to run in it from ubuntu build, the './qgis' command used to
show all messages in the terminal? can something similar be done using the
osego4w install?

Thanks
Vinayan




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Re: [Qgis-developer] Icon theme update

[vinayan]

Hi,

Any discussions on colors,icons etc always generate a lot of heat. I hope I
am not being offensive to anyone here.

Personally, I liked the old classic theme and would prefer it to have as an
alternate option. Anyway, putting my disappointment aside, I have started
getting accustomed to the new theme. Here are my thoughts/comments about
some icons from 'gis' theme.

 - pan map, pan map to selection - most apps associate 'hand' icon to
pan..so first time qgis users(having already used other graphics apps) would
find it handy..
 - rotate feature(s) - both icons(classic and gis) are poor. In the gis
icon, the rotation part near the corner is too small to see. Classic icon
was contributed by me..no comments ;)
 - move feature(s) - most apps have icons similar to the classic theme
 - zoom last, zoom next - The left and right arrows are better inside the
magnifying glass as in the classic theme. Also I like how the handles of
glasses in classic theme are symmetrically placed about y-axis making the
two icons complementary
 - Node Tool - very complicated icon in gis theme..only a single point is
shown. If multiple vertices were present in icon, it would be better
 - All Icons in the add layer toolbar - the icons are good..it would be
great if some bright colors can be used for all these icons instead of the
lighter grey for better distinguishing 

hope others come up with better suggestions to make the 'gis' theme better.

Thanks
Vinayan



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Re: [Qgis-developer] QgsRubberband does not draw polygons(python)

[vinayan]

thanks to Salvatore's help on irc, i got over this issue.

apparently the 'isPolygon' method was deprected..

here is the snippet that worked..

mCanvas = iface.mapCanvas()
rb = QgsRubberBand(mCanvas,QGis.Polygon)
rb.addPoint(QgsPoint(300,300))
rb.addPoint(QgsPoint(400,400))
rb.addPoint(QgsPoint(400,600))
print rb.asGeometry().exportToWkt()
POLYGON((300.0 300.0,400.0 400.0,400.0 600.0,300.0 300.0))




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[Qgis-developer] QgsRubberband does not draw polygons(python)

[vinayan]

Hi,

I am simply stuck at a seemingly simple issue. I want to create a polygon
rubberband. But even after setting the isPolygon in the constructor to
'True', it is creating a polyline rubberband. I am using latest master
version. Here is what i tried in the python console.

pastebin link <http://pastebin.com/bKGJwZkB>  

mCanv = iface.mapCanvas()
rb = QgsRubberBand(mCanv,True) #shouldn't this constructor create a polygon
shaped band?
 
rb.addPoint(QgsPoint(300,300))
rb.addPoint(QgsPoint(400,400))
rb.addPoint(QgsPoint(400,600))
 
print rb.asGeometry().exportToWkt()
 
LINESTRING(300.0 300.0, 400.0 400.0, 400.0 600.0)

Shouldn't the exportToWkt() be outputting a Polygon instead of a Linestring?
What am i doing wrong here?

Thanks
Vinayan






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Re: [Qgis-developer] Why does the Simplify Feature tool have no normal input field for the tolerance?

[vinayan]

+1, that would be a good option..for example, in my data, once I know that
entering 0.05 for the tolerance would be enough to simplify a geometry to my
requirements, it is tiresome to drag the slider everytime..



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Re: [Qgis-developer] rectangle oval digitizing and CAD Tools

[vinayan]

hi..I have made the changes..probably needs approval from mods to show latest
version(1.1.1)in plug-in installer?



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Re: [Qgis-developer] rectangle oval digitizing and CAD Tools

[vinayan]

I think this has something to do with the missing plugin metadata
:)



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Re: [Qgis-developer] contributing diffs

[vinayan]

Hi Larry,

You are correct.. I just had to do a force push :(



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Re: [Qgis-developer] contributing diffs

[vinayan]

I also believe a nice workflow should be in the qgis website somewhere.

We have a brief one here at
http://hub.qgis.org/wiki/17/GIT_Workflow

Probably someone could update the above page and link it to the developer
help pages..

Below mentioned link mentions my workflow..what i observed with this is that
I no longer need to do a force push..
http://opengisdev.wordpress.com/2013/02/22/branch-based-workflow-for-qgis/



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Re: [Qgis-developer] How to make my plugin project page a subproject of "User Plugins" or delete it

[vinayan]

Hi,

Is this plugin approved? I would like to uset it. I still cannot get it by
using 'fetch python plugins' in Qgis 1.8.0

Regards
Vinayan




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Re: [Qgis-developer] New website

[vinayan]

+1 the logo definitely needs a redesign..



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Re: [Qgis-developer] creating a windows build out of a git branch from ubuntu

[vinayan]

Hi Denis,

I tried and got a few errors..If it works in any branch, i will explore
more.

http://pastebin.com/H7rrdid1

jef told me it could be due to broken downloads..not sure how i can fix it..

Thanks
Vinayan



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[Qgis-developer] creating a windows build out of a git branch from ubuntu

[vinayan]

Hi,

I would like to create a windows installer from my git branch. I am
currently developing on Ubuntu 12.04 and would like to know if it is
possible to do this from linux itself. My previous attempts at building in
windows never succeeded. I checked Tim's article about using the nsis
script(http://linfiniti.com/2012/05/quick-tip-build-the-latest-qgis-nightly-build-as-a-standalone-installer-for-windows/).
But i think this article is about creating installer for the latest qgis dev
version.

Anyone got ideas?

Regards
Vinayan



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[Qgis-developer] [New Plug-in] Topology Checker - pull request

[vinayan]

Hi all,

I have issued a pull request for a topology checker plug-in. Please test 
and provide feedbacks.

https://github.com/qgis/Quantum-GIS/pull/425

Thanks
Vinayan

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Re: [Qgis-developer] new geom function: combine cascaded

[vinayan]

Hi,

Sorry for jumping in on this old thread. Wouldn't it be a really useful
addition to QgsGeometry class? The current union is extremely slow when
large number of geometries are processed. I also think this could be the
real issue in slow dissolve in ftools.

I recently used this on my plugin. Roughly it is around 10 times faster then
normal union. I hope we can introduce a new union method without breaking
the existing union.

Thanks
Vinayan



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Re: [Qgis-developer] How to get Provider default values for each attribute using Python

[vinayan]

Hi Alexandre,

I recently used provider default values in a plugin like this..

provider = layer.dataProvider()
f = QgsFeature()

#On the Fly reprojection.
if layerCRSSrsid != projectCRSSrsid:
geom.transform(QgsCoordinateTransform(projectCRSSrsid,
layerCRSSrsid))

f.setGeometry(geom)

# add attribute fields to feature
fields = layer.pendingFields()

# vector api change update
if QGis.QGIS_VERSION_INT >= 10900:
f.initAttributes(fields.count())
for i in range(fields.count()):
f.setAttribute(i,provider.defaultValue(i))
else:
for i in fields:
f.addAttribute(i,  provider.defaultValue(i))



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[Qgis-developer] Plugin update request(RectOvalDigit)

[vinayan]

Hi,

I made a small update in "Rectangles,Ovals Digitizing Plugin" to work with
the current master(1.9.0). Could someone look at approving this updated
version?

http://plugins.qgis.org/plugins/rectovalDigit/


Thanks
Vinayan



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Re: [Qgis-developer] geos help(union polygons)

[vinayan]

Dear Marco,

I got it worked. I used GEOSUnionCascaded. On a polygon layer with 121336
features, process completed in around 3 minutes. Earlier I just used to kill
the process after half an hour waiting and memory issues.

Thanks
Vinayan



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Re: [Qgis-developer] geos help(union polygons) (Marco Hugentobler)

[vinayan]

On Thursday 24 January 2013 02:45 PM, 
qgis-developer-requ...@lists.osgeo.org wrote:

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Today's Topics:

1. Re: OpenLayers plugin release and Python API breaks
   (Matthias Kuhn)
2. Re: Redmine frequent errors (Paolo Cavallini)
3. Re: geos help(union polygons) (Marco Hugentobler)
4. Re: OpenLayers plugin release and Python API breaks
   (J?rgen E. Fischer)
5. Re: OpenLayers plugin release and Python API breaks
   (Matthias Kuhn)
6. Re: Cast your vote: Default icon theme for QGIS 2.0 (Tim Sutton)
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Hi Marco,

Thanks a lot for your suggestion. It is of great help. I did not know we had 
two geos versions. I have seen QgsGeometry::asGeos() and similar methods but 
never knew it was from C-api.

regards
Vinayan

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[Qgis-developer] geos help(union polygons)

[vinayan]

Hi,

I am trying to find gaps inside a polygon layer much like the ESRI 
topology rule("must not have gaps"). I did this initially by making an 
extent polygon and then subtracting the union of all geometries from 
this extent polygon.


All this worked well and for around 100 polygons in the extent the 
performance is ok. But when the count goes up, the performance is 
drastically down. The issue, I think is because I am creating the union 
iteratively as below.


for ( it = mFeatureList1.begin(); it != FeatureListEnd; ++it )
{
g2 = it->feature.geometry();
g1 = g1->combine( g2 );
}


From what I read from Martin Davis' 
blog(http://lin-ear-th-inking.blogspot.in/2007/11/fast-polygon-merging-in-jts-using.html), 
the cascaded polygon union improves the performance of union by a large 
ratio.


I want to use the below method that exist in Geos. But I am not sure how 
to use it.


I got this far(also pasted in pastebin http://pastebin.com/rniMLuZW),

std::vector geomCollection;

QList::ConstIterator FeatureListEnd = mFeatureList1.end();
for ( it = mFeatureList1.begin(); it != FeatureListEnd; ++it )
{
g1 = it->feature.geometry();
const std::string wkt = g1->exportToWkt().toStdString();
geos::geom::Polygon* geom = 
dynamic_cast(geos::io::WKTReader().read(wkt)); 
//error is here

geomCollection.push_back(geom);
}

geos::geom::Geometry* unionedPoly = 
geos::operation::geounion::CascadedPolygonUnion::Union(&geomCollection);



The error is,
/home/vinayan/QgisGitWorking/Quantum-GIS/src/plugins/topology/topolTest.cpp:746: 
error: cannot dynamic_cast 
‘geos::io::WKTReader().geos::io::WKTReader::read((* & wkt))’ (of type 
‘struct geos::geom::Geometry*’) to type ‘struct geos::geom::Polygon*’ 
(target is not pointer or reference to complete type)



This has more to do with my c++ knowledge than anything i guess..but if 
anyone can help where I am going wrong, it would be a good step forward 
for me. If it works well, I am sure this function would find use in 
other parts of Qgis where slow unions are involved.


Thanks in advance,
Vinayan

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[Qgis-developer] New MapTool(Rotate Features)

[vinayan]

Hi all,

I have created a new MapTool(c++) for rotating multiple selected 
features interactively using mouse 
movement(https://github.com/qgis/Quantum-GIS/pull/376).


Normal Usage:
Select features on map.
Press mouse and drag to rotate about the selected features' 
bounding-box's center.


Advanced Usage:

User can decide which point should be the anchor point to rotate about. 
A cross appears on the center of bounding-box of selected features by 
default. Hold "Control" key and move mouse(no pressing) to move this 
cross to the desired anchor position. Release "Control" key to fix the 
anchor. Now press and drag mouse to rotate about this new anchor.



A very special thanks to Nathan Woodrow for his support on irc channel. 
I had really messed my branching/commits big time and his help was very 
important.


Thanks
Vinayan


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[Qgis-developer] Wish to Support Topology for Qgis

[Vinayan Mp]

Dear All,

As a Qgis user,I have always wished there were ways to efficiently view and
fix existing topological errors in data. As I researched a bit, there were
some developments going  around 3 years ago in this regard. I found a
source too in Martin Dobias' Github repository.

If nobody is currently working on it, I would be happy to support the
integration of this to Quantum GIS. I have done something similar in a
popular 2-D drafting application using NetTopologySuite(a c# port of Java
Topology Suite) as a hobby project. Since GEOS is also a port of JTS,
things might be comfortable. As I took a quick look at the code, it seems
to be very close to completion. Though I am not a hardcore C++ developer, I
am sure my C# experience would guide me to work on this.

best regards,
Vinayan
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Re: [Qgis-developer] Pyton Script from Qgis Console Help

[vinayan mp]

Hi Asahi,

Thanks a lot for taking your time to review. Appreciate uploading the
edited file. Helped me a lot. And the new script-runner  plugin is simply
stunning.

Thank you
Vinayan


On Wed, Mar 21, 2012 at 8:56 AM, ASAHI Kosuke  wrote:

> Hi Vinayan
>
> I can run your script on qgis 1.7.4,
> but I change few points adapt to script runner plugin(see following link).
>
> http://spatialgalaxy.net/2012/**01/29/script-runner-a-plugin-**
> to-run-python-scripts-in-qgis/<http://spatialgalaxy.net/2012/01/29/script-runner-a-plugin-to-run-python-scripts-in-qgis/>
>
> Please run this script on script runner.
>  
> http://d.hatena.ne.jp/waigani/**files/rotate.py?d=download<http://d.hatena.ne.jp/waigani/files/rotate.py?d=download>
>
> If you have crash again, I need more infomation (OS? version? etc..).
>
>
> (2012/03/21 1:14), vinayan wrote:
>
>> Hi all,
>>
>> I just read about running python scrips from Qgis Console(article by
>> Gary Sherman
>> http://spatialgalaxy.net/2012/**01/27/qgis-running-scripts-in-**
>> the-python-console/<http://spatialgalaxy.net/2012/01/27/qgis-running-scripts-in-the-python-console/>
>> ).
>> I am trying rotate each point in a layer based on a center point. I
>> managed some code by copying from the CadTools plugin(by Stefan
>> Ziegler). Whenever i run this from qgis console, it crashes the
>> application. Can somebody point me in the right direction? Please find
>> the code below. I have to admit that i started python only yesterday.
>>
>> Note: I am not sure if this is the place to ask this. But i have been
>> inspired by reading
>>
>>
>> --**--**
>> --**--**
>> 
>> #!/usr/bin/env Python
>> """Load all shapefiles in a given directory.
>> This script (iteratefeature.py) runs from the QGIS Python console.
>>  From the console, use:
>> from iteratefeature import Looper
>> ldr = Looper(qgis.utils.iface)
>> ldr.LoopXY()
>>
>> """
>> from glob import glob
>> from os import path
>> from qgis.core import *
>> import math
>>
>> class Looper:
>> def __init__(self, iface):
>> """Initialize using the qgis.utils.iface
>> object passed from the console.
>>
>> """
>> self.iface = iface
>>
>>
>> def LoopXY(self):
>>
>> basePoint=QgsPoint(-121.**3140824, 38.63196648)
>> rotAngle=45
>>
>> mc = self.iface.mapCanvas()
>> layer = mc.layer(0)
>> provider = layer.dataProvider()
>>
>> feat = QgsFeature()
>> provider.select()
>>
>>
>> while(provider.nextFeature(**feat)):
>> #layer.startEditing()
>> geometry = feat.geometry()
>> geom1=rotate(geometry,**basePoint,rotAngle * math.pi / 180)
>> layer.changeGeometry(feat.id()**, geom1)
>> #feat.setGeometry(geom1)
>> #print "X Coord %d: " %geometry.asPoint().x()
>> #print "Y Coord %d: " %geometry.asPoint().y()
>> layer.commitChanges()
>> print "updated %d: " %feat.id()
>> print
>>
>> # Rotate script
>> def rotate(geometry, point, angle):
>>
>> if angle == 0 or angle == 2 * math.pi or angle == -2 * math.pi:
>> return geom
>>
>> p0 = geometry.asPoint()
>> p1 = QgsPoint(p0.x() - point.x(), p0.y() - point.y())
>> p2 = rotatePoint(p1, angle)
>> p3 = QgsPoint(point.x() + p2.x(), point.y() + p2.y())
>> return QgsGeometry().fromPoint(p3)
>>
>>
>> # Rotates a single point (centre 0/0).
>> # (c) Stefan Ziegler
>> def rotatePoint(point, angle):
>> x = math.cos(angle)*point.x() - math.sin(angle)*point.y()
>> y = math.sin(angle)*point.x() + math.cos(angle)*point.y()
>> return QgsPoint(x, y)
>>
>>
>> --**--**
>> --**--**
>>
>> Regards
>> Vinayan
>>
>>
>>
>> __**_
>> Qgis-developer mailing list
>> Qgis-developer@lists.osgeo.org
>> http://lists.osgeo.org/**mailman/listinfo/qgis-**developer<http://lists.osgeo.org/mailman/listinfo/qgis-developer>
>>
>
>
> --
> ASAHI Kosuke
>
>
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[Qgis-developer] Pyton Script from Qgis Console Help

[vinayan]

Hi all,

I just read about running python scrips from Qgis Console(article by 
Gary Sherman 
http://spatialgalaxy.net/2012/01/27/qgis-running-scripts-in-the-python-console/). 
I am trying rotate each point in a layer based on a center point. I 
managed some code by copying from the CadTools plugin(by Stefan 
Ziegler). Whenever i run this from qgis console, it crashes the 
application. Can somebody point me in the right direction? Please find 
the code below. I have to admit that i started python only yesterday.


Note: I am not sure if this is the place to ask this. But i have been 
inspired by reading




#!/usr/bin/env Python
"""Load all shapefiles in a given directory.
  This script (iteratefeature.py) runs from the QGIS Python console.
  From the console, use:
from iteratefeature import Looper
ldr = Looper(qgis.utils.iface)
ldr.LoopXY()

  """
from glob import glob
from os import path
from qgis.core import *
import math

class Looper:
def __init__(self, iface):
"""Initialize using the qgis.utils.iface
object passed from the console.

"""
self.iface = iface


def LoopXY(self):

basePoint=QgsPoint(-121.3140824,  38.63196648)
rotAngle=45

mc = self.iface.mapCanvas()
layer = mc.layer(0)
provider = layer.dataProvider()

feat = QgsFeature()
provider.select()


while(provider.nextFeature(feat)):
#layer.startEditing()
geometry = feat.geometry()
geom1=rotate(geometry,basePoint,rotAngle * math.pi / 180)
layer.changeGeometry(feat.id(), geom1)
#feat.setGeometry(geom1)
#print "X Coord %d: " %geometry.asPoint().x()
#print "Y Coord %d: " %geometry.asPoint().y()
 layer.commitChanges()
print "updated %d: " %feat.id()
print

# Rotate script
def rotate(geometry,  point,  angle):

if angle == 0 or angle == 2 * math.pi or angle == -2 * math.pi:
return geom

p0 = geometry.asPoint()
p1 = QgsPoint(p0.x() - point.x(),  p0.y() - point.y())
p2 = rotatePoint(p1,  angle)
p3 = QgsPoint(point.x() + p2.x(),  point.y() + p2.y())
return QgsGeometry().fromPoint(p3)


# Rotates a single point (centre 0/0).
# (c) Stefan Ziegler
def rotatePoint(point,  angle):
x = math.cos(angle)*point.x() - math.sin(angle)*point.y()
y = math.sin(angle)*point.x() + math.cos(angle)*point.y()
return QgsPoint(x,  y)


----

Regards
Vinayan

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Re: [Qgis-developer] core "plugins" or just qgis tools?

[vinayan]

Hello,

ftools, gdal and georeferencer should be called Qgis Tools..can't live 
without these for a common gis user...


On 01/04/2012 06:26 PM, Giovanni Manghi wrote:

Hi all,

I would like to know what do you think about the following.

Many QGIS users find puzzling that many core tools shipped with QGIS are
listed/available as "plugins". I agree with them, they should not be
available (to be enabled/disabled) in the "manage plugins" dialog and a
few should be enabled by default (examples: ftools, gdal tools,
delimited text layer).

Something that can be optimized along the road to 2.0?

cheers

-- Giovanni --

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