GIS Components for Lazarus
lazarus / 5-Lazarus Extra Components

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Kaos · 2007-11-06 04:33

Is there anyone out there currently developing any GIS components for
Lazarus.

Is anyone who is good at C++ (I suck BIG at it :roll:  ) interested in
helping port an open source OCX written in C++ over to a Lazarus
Component???.

Cheers
Al.


 :arrow:   What Happens If I Press This Thing Here    :?

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Phil · 2007-11-06 14:49

Quote from: "Kaos"Is there anyone out there currently developing any
GIS components for Lazarus.

Is anyone who is good at C++ (I suck BIG at it :roll:  ) interested in
helping port an open source OCX written in C++ over to a Lazarus
Component???.

I use the open source MapWindow GIS (www.mapwindow.org). MW is a .NET
app but the heart of it is an .ocx component - maybe that's what
you're referring to?

It would be great to have something like MW (or its engine) available
on other platforms (Mac OS X particularly).

I suspect the challenge in porting something like this would not be in
the C++ code (OS X and Linux both have the GCC C++ compiler) but in
writing the equivalent calls for all the Windows API-specific stuff
that they're undoubtedly doing.

Thanks.

-Phil

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Kaos · 2007-11-07 06:58

i feel in writing a GIS control that is fully cross platform
compatible the idea would be to make the OS specific functions a
library file that is called at compile time. i wrote a similar thing
for a previous client ( a Cross Platform compatible CAD / Survey
Package) that used libraries for mac and windows and unix to handle OS
specific issues. it was clunky to compile but it worked OK on all
platforms basically - there were hardware issues but that is again a
seperate issue.

TatukGIS is a control that has possibilities - it is a vcl control for
delphi but its not open source. i kinda got it to compile with lazarus
under windows and it worked reasonably well though slow. and it almost
compiles undr lazarus for linux but there are some type library issues
- particulary those dealing with thematic rendering.

years ago i came across a platform independant GIS control that worked
on both unix and windows but cant remember the name of it - that was
written in C++ - we never pursued its use at the time due to the
excessivley high deployment royalties.

im more and more impressed with Lazarus the more i mess with it - ( im
a newbie to Lazars of about a week - being previously a delphi / kylix
programmer) -  i hope to be able to progress this GIS Control as a LCL
component for Lazarus -


Cheers
Al.

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Phil · 2007-11-07 15:20

Quote from: "Kaos"years ago i came across a platform independant GIS
control that worked on both unix and windows but cant remember the
name of it - that was written in C++ - we never pursued its use at the
time due to the excessivley high deployment royalties.

im more and more impressed with Lazarus the more i mess with it - ( im
a newbie to Lazars of about a week - being previously a delphi / kylix
programmer) -  i hope to be able to progress this GIS Control as a LCL
component for Lazarus

The C++ source for the MapWindow .ocx _is_ open source (MPL 1.1):

http://svn.mapwindow.org/svnroot/MapWinGIS4Dev/

Thanks.

-Phil