[Qgis-developer] distance measure feature isn't working correctly

[Byambaa Mendbayar]

Dear Maciek,

In the finally I got a correct result from distance measuring and area
measuring tools. But it does have to follow too complicated rules which are
following:

1. To activate the "Enable the fly projection" 
2. To select your preferred unit (degree/feet/meter) 

You have to firstly activate "Enable the fly projection", if you reverse
above order then you should be re-assign preferred unit again :-(

Also there have strange thing still there. My setting of unit is switched by
degree when I set my preferred unit (mostly meter). Is that bug or not?! 

In before (I mean 0.8.0 and 0.8.0 pre2) distance and area measuring tools
were working well without above extra rules!!! (I mean in before I haven't
set previously activate the "Enable the fly projection".)
It's better to end-user. Isn't it? 

In the end thanks a lot for your kind help and advice.

Thank you very much.

Best regards,
Byambaa Mendbayar

-----Original Message-----
From: Maciej Sieczka [mailto:tutey at o2.pl] 
Sent: Monday, July 30, 2007 6:37 PM
To: Tim Sutton
Cc: mendbayar_b at mongol.net; qgis-developer at lists.qgis.org
Subject: Re: [Qgis-developer] distance measure feature isn't working
correctly

Tim Sutton wrote:
> Em 25/07/2007, às 03:57, Byambaa Mendbayar escreveu:

>> I have feedback on distance measure tool in QGIS. It isn't working
>> correctly; I mean it wasn't correct distance value on map. I have
>> tested that issue on both on SVN Trunk (head) and Release-0_8_1
>> branch. By the way I have old version of QGIS compiled by myself I
>> didn't remember that version's revision. This old compiled version
>> is working well for distance measuring and area measuring.

I'm not sure if this is a bug or a new feature - in QGIS 0.8.1 and 0.9
one *has to* "Enable the fly projection" for measuring tools to return
expected values. Defining a projection for your project that suits the
projection of your dataset is not enough. Could a knowledgable QGIS
develepor explain?

Furthermore, I noticed a regression in 0.9 compared to 0.8.1 - you
can't set units to meters or feet when working in lat/lon projection
and to degrees for metric/feet system - through the interface that pops
up after clicking the camera icon in the bottom-right. QGIS will always
reset units to degrees for the former and to meters/feet in the latter
case. However, you can manage the units fine if you do the same
operation via Settings -> Project properies -> General. Strange.

Maciek