KML Overlay Plugin

[SethDart]

git remote add github git://github.com/OpenCPN/OpenCPN.git
git pull github KMLOverlay
cd build
make
sudo make install

[sailias]

Thanks....here is the trick.

1. The addition of the external git repository has to be done from within the existing source directory. This is where I was getting caught all day as if you do it one level up it comes back as negative.

2. the libkml-devel package is installed as well as dependancies for Ubuntu 11.10 however the error message I get is as follows:

--------------
-- *** Building kmloverlay_pi ***
CMake Error at /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:91 (MESSAGE):
Could NOT find libkml (missing: libkml_INCLUDE_DIR)
Call Stack (most recent call first):
/usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:252 (_FPHSA_FAILURE_MESSAGE)
plugins/kmloverlay_pi/Findlibkml.cmake:61 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
plugins/kmloverlay_pi/CMakeLists.txt:61 (FIND_PACKAGE)
----------------------------------eof-------------

With make I can direct it to the appropriate directory to find those but running cmake -help provides no clues on how to point to /usr/include/klm. Adding it to the $PATH variable has no effect, nor does ldconfig.

Thanks for any pointers and your patience.

/ch

[sailias]

OK I think I found the issue:

The cache file gives me the following:
-------------------------------------------------------
//Value Computed by CMake
kmloverlay_pi_BINARY_DIR:STATIC=/home/chris123/opencpn/build/plugins/kmloverlay_pi

//Value Computed by CMake
kmloverlay_pi_SOURCE_DIR:STATIC=/home/chris123/opencpn/plugins/kmloverlay_pi

//Path to a library.
libkml_BASE_LIBRARY:FILEPATH=/usr/lib/libkmlbase.so

//Path to a file.
libkml_BOOST_INCLUDE_DIR:PATH=libkml_BOOST_INCLUDE _DIR-NOTFOUND

//Path to a library.
libkml_DOM_LIBRARY:FILEPATH=/usr/lib/libkmldom.so

//Path to a library.
libkml_ENGINE_LIBRARY:FILEPATH=/usr/lib/libkmlengine.so

//Path to a file.
libkml_KML_INCLUDE_DIR:PATH=/usr/include/kml
--------------------------------------------------------eof------

So to me it looks like it cant find the libkml_boost. Now checking the installed files with synaptic, I get the following:

-------------------
usr/include/kml/third_party/boost_1_34_1
/usr/include/kml/third_party/boost_1_34_1/boost
/usr/include/kml/third_party/boost_1_34_1/boost/assert.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/checked_delete.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/config
/usr/include/kml/third_party/boost_1_34_1/boost/config.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/config/compiler
/usr/include/kml/third_party/boost_1_34_1/boost/config/compiler/gcc.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/config/no_tr1
/usr/include/kml/third_party/boost_1_34_1/boost/config/no_tr1/utility.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/config/platform
/usr/include/kml/third_party/boost_1_34_1/boost/config/platform/linux.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/config/platform/macos.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/config/posix_features.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/config/select_compiler_config.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/config/select_platform_config.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/config/select_stdlib_config.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/config/stdlib
/usr/include/kml/third_party/boost_1_34_1/boost/config/stdlib/libstdcpp3.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/config/suffix.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/config/user.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/detail
/usr/include/kml/third_party/boost_1_34_1/boost/detail/workaround.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/intrusive_ptr.hpp
/usr/include/kml/third_party/boost_1_34_1/boost/scoped_ptr.hpp
-----------------------eof------

so if I am not mistaken, libkml_boost exist but cmake cannot find it.

Cluesless but not in Seatle...

/ch

[SethDart]

you can tell the path to cmake with this:
cd build
cmake -Dlibkml_BOOST_INCLUDE_DIR=/usr/include/kml/third_party/boost_1_34_1 ../
make

Or you can install boost-dev (see message from Thomas/cagney at the beginning from this thread)

[sailias]

Yup installing boost-dev did the trick. Builds without errors. Will report back who she functions.

Many thanks

/ch

[sailias]

Thanks Seth: I all seems to work now.

/ch

[SethDart]

Would you mind opening a bug for Ubuntu about this?
libkml-dev sould pull boost-dev as a dependency.

Here's the bug I opened for Fedora:
https://bugzilla.redhat.com/show_bug.cgi?id=787388

It's slightly different for Fedora because libkml-devel doesn't even provide /usr/include/kml/third_party/boost_1_34_1 (it's stripped when building to ensure local boost-devel is used instead of this Google's embedded one)

This is a very easy change: add require to the packaging, rebuild the package and that's all.

Thanks,
Jean-Eudes

[sailias]

Sure no problem.

/ch

[SethDart]

Hi all,

I've pushed some updates to github:
https://github.com/OpenCPN/OpenCPN/commits/KMLOverlay

The plugin is now able to handle transparency for KML objects.

Unfortunately, this require some changes to the API. I'll check with Dave as he returns from his trip if they can be included in core OpenCPN. IMHO these changes can benefit to many plugins, mainly grib plugin. I've also updated both default plugins to reflect this change. All "Core:" commits shall be included in core OpenCPN by Dave, they are not directly related to this plugin (but API bump is, obviously).

Next to come: ScreenOverlay and GroundOverlay!

[SethDart]

Ladies and Gentlemen,

Please wecome the new GroundOverlay!

I just pushed the latest changes to handle KML GroundOverlay feature.

Here's a kmz sample made with GE for Herm island near Guernsey

And this is the result displayed with this plugin. Alpha (transparency) is set directly in GE, and can be changed easily in the resulting KMZ file (or in GE) without further reprocessing the image.

To create a kmz:
- open GE
- go to the location you want to export with required zoom level
- menu File > Save > Save picture (Ctrl+Alt+S)
- menu Add > Image overlay (Ctrl+O)
* select picture previously saved
* center/resize picture to match background (play with transparency to switch between both)[1]
* adjust transparency as you want

To export:
- Right click on Places (panel on the left) :: {name of your overlay} > Save place as

Then you can open the kmz file with the plugin. The original picture saved at first step is no more required, it's embedded in the kmz file.

[1] Unfortunately GE does not map the image to the full screen as it was captured. I found it easier to create two place marks NW and SE to align picture later. Hopefully ge2kap or a similar tool can be created to achieve this automatically.

[SethDart]

Dear Windows testers,

I've just uploaded a full installer package here: http://je.onfray.fr/dl/opencpn_2.6.1310_setup.exe (26MB)
The kml plugin is included in this package. Works here on a Windows XP VM. Please test and report.

Warning, this is not official beta. I hope Dave will include required changes (rather small) required for the plugin to work this way. If not, I'll have to find another way ;-) or there won't be transparency :-(

[HappySeagull]

Oh jeez, sorry. No, nothing - same old log entry. 2 XP laptops tried.

[LeaseOnLife]

Originally Posted by HappySeagull

Oh jeez, sorry. No, nothing - same old log entry. 2 XP laptops tried.

Happy: Thanks for breaking the bad news, didn't want to be the first one

Seth: Same here

[SethDart]

F..k!
Have you ever tried to build OpenCPN on these PCs?
I don't understand ; nothing special on my side. Can it be related to libexpat? I don't even know how to find what's wrong ; if it's my plugin, libexpat or some incompatibility with some wxWidgets.
Have you another libexpat in your path or somewhere else? Same for wxWidgets?
Last wednesday, I tried to get it to run on a Win7 that failed before. After 4 hours recompiling everything: libkml, uriparser, gzip, expat, wxWidgets I surrendered! I'm not expert in Windows. Let's hope Dave has a clue. I don't really knows what options he's enabled to get the whole working.

If anyone has an idea, I'm all ears. The whole source is available with instructions to compile it.

Thanks

[LeaseOnLife]

Seth... don't get frustrated.

I am not going to build from source, fully knowing that I am missing out on some cutting edge features. But part of testing is to use an (end-) user's environment.

Cheers

Dirk