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Updated proposal: Implement KML SVG translation
by David Xiong 13 Apr '11

13 Apr '11

Hi, Thank you for the comments on my proposal. I have replied to the comments below my proposal, as in the forwarded email in the following. I have revised my proposal based on the comments that I got and some resources that I read further. It can be found in: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/ywxiong/… <http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/ywxiong/…>Thank you. David. ---------- Forwarded message ---------- From: <no-reply@...2613...> Date: Wed, Apr 13, 2011 at 1:21 AM Subject: [Inkscape] New public review on Implement KML SVG translation (david_xiong) by david_xiong To: yunwxiong@...400... Hi, david_xiong has left the following public review at http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/ywxiong/…: Hi, I will add the following comments or changes. 1. Reply to comments on my proposal Re: *Jasper* The benefit is that the implementation would allow conversion between SVG and KML. Then, the SVG file made by a user can be viewed in Google Map/Earth, after converted to KML. Scenarios that Tavmjong Bah mentioned are good ones where it may be useful. Re: Tavmjong Bah It sounds great, if there are a group of people extending SVG for mapping purposes. I will try and contact them, and see how they solve these problems and what features they provide. Your second comment is particularly useful. I will take these scenarios into account. I agree, instead of pre-processing the data, or cropping some data off, we can store them in SVG too. The SVG would not show certain data from KML, but can keep them. As this SVG is modified and converted back to KML, the KML is updated without losing data. I agree that this is a better way to deal with some different entities in SVG and KML. 2. Found a resource I found on Inkscape idea page that tbrugz mentioned his SVG to KML convertor in Java. It seems useful to look at. https://blueprints.launchpad.net/inkscape/+spec/kml-svg-translation *********** 2010-08-12 - tbrugz Hi, I´ve developed an initial converter from SVG to KML in Java. It currently converts polygons, given the output "bounds" (north, east, south, west). Infos and hg repository is at https://bitbucket.org/tbrugz/kmlutils/. Feel free to improve on it *********** 3. Change to my proposal Tasks added to the plan: l Contact a group of people extending SVG for mapping purposes, and see how they solve these problems and what features they provide. l Review the Java SVG to KML convertor written by tbrugz. If some methods are useful, rewrite the Java code to be C++. A task listed in the proposal needs to be changed. Original: 2. write the logic to eliminate the unused element --- two way Change to be: Check and see whether or not certain KML data can be converted to be SVG entities. If convertible, convert them. If not convertible, store them in SVG file as KML entities. Then, these data are ignored by Inkscape, but would still exist in the KML converted back. As this SVG is modified and converted back to KML, the KML is updated without losing data. Greetings, The Google Open Source Programs Team --- You are receiving this message because you are participating in Google Summer of Code 2011. To stop receiving these messages, go to: http://www.google-melange.com/gsoc/profile/google/gsoc2011.

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Re: [Inkscape-devel] Mockup for Improvement of Fill and Stroke Dialog
by Andrew 12 Apr '11

12 Apr '11

Hi again :) Okay so after previous feedback, that the comboboxes for the fill type and fill rule were not optimal (i.e. it is quicker to click a button than select something from a combobox), I have ammended the mockups, adding back in the buttons. I also corrected some padding in places, where I seem to have gone a bit mad with it :) Please see the two mockups here http://wiki.inkscape.org/wiki/index.php/Fill_and_Stroke_Dialog_Re-Design#My… Again I really do welcome feedback, positive or negative :) -- Andrew

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Howto - linker dependent linker flags in makefile - help needed
by the Adib 12 Apr '11

12 Apr '11

Hello developers, we run into a little problem while dealing with upcoming gcc 4.6 compatibility. Any help for a "good" solution appreciated. Full story below. Thanks, Adib. -- There should be linker flags leading by "-Wl" curently there is not such option. Gcc fails builing without. But under OSX a native apple darwin compiler is used that do not know this option. I modified makefile to test for osx: src/Makefile.am: ... if PLATFORM_OSX inkscape_LDFLAGS = --export-dynamic $(kdeldflags) $(mwindows) else inkscape_LDFLAGS = -Wl,--export-dynamic $(kdeldflags) $(mwindows) endif ... and conficure.ac: ... dnl ****************************** dnl MacOS X dnl ****************************** AC_MSG_CHECKING([for OSX platform]) if test "x$build_vendor" = "xapple" ; then platform_osx=yes else platform_osx=no fi AC_MSG_RESULT([$platform_osx]) AM_CONDITIONAL(PLATFORM_OSX, test "$platform_osx" = "yes") ... But we should test for linker not a gnu linker. There is such test in aclocal.m4: ... # _LT_PATH_LD_GNU #- -------------- m4_defun([_LT_PATH_LD_GNU], [AC_CACHE_CHECK([if the linker ($LD) is GNU ld], lt_cv_prog_gnu_ld, [# I'd rather use --version here, but apparently some GNU lds only accept -v. case `$LD -v 2>&1 </dev/null` in *GNU* | *'with BFD'*) lt_cv_prog_gnu_ld=yes ;; *) lt_cv_prog_gnu_ld=no ;; esac]) with_gnu_ld=$lt_cv_prog_gnu_ld ])# _LT_PATH_LD_GNU ... So the question is how to modify those files that gnu linker is checked and in case on gnu linker we put "-Wl" in front of those linkre oprtions? Thanks for patience, Adib.

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Updated Cairo branch
by Krzysztof Kosiński 10 Apr '11

10 Apr '11

Hello I have updated my Cairo branch today, as a step towards merging it. There is one new regression, namely feImage does not handle aspect ratio. It will be fixed before merging. IIRC, there is a problem with CMS output, the editing controls are not using custom XOR blending, and there are build failures on Windows. Does anyone remember any other bugs? Regards, Krzysztof

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GSoC - any other mentors?
by Josh Andler 09 Apr '11

09 Apr '11

Hey all, At this point we have more proposals than mentors, and our lowest turnout for mentors since we've been participating in GSoC. If you're interested in mentoring, please log in to melange and visit http://socghop.appspot.com/gsoc/org/google/gsoc2011/inkscape to request to become a mentor. Cheers, Josh

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Quadratic beziers?
by Blue Bomber 08 Apr '11

08 Apr '11

Done anyone know if Inkscape supports quadratic splines, or only cubic? Thanks! Mike

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Faster rounding, might break?
by Jasper van de Gronde 08 Apr '11

08 Apr '11

Johan mailed me a link to this site: http://stereopsis.com/sree/fpu2006.html Based on the routine proposed there I just implemented faster rounding in Gaussian blur (the IIR code uses it extensively). In my tests this speeds up blurring by about 10-20%, not insignificant for such a small change. However, the procedure does make use of the internal representation of a double, so I'm a little worried about it breaking on different architectures. If you use a non-Intel architecture it would be great if you could try out the Gaussian blur currently in bzr (it's rev. 10144) and see if anything goes wrong.

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gtkmm 3.0 is out
by Alexandre Prokoudine 06 Apr '11

06 Apr '11

FYI: http://www.murrayc.com/blog/permalink/2011/04/06/gtkmm-3-0-0/ Alexandre Prokoudine http://libregraphicsworld.org

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Keyboard shortcuts suggestion
by Mike 05 Apr '11

05 Apr '11

I'm probably not the first to suggest this, but why not offer a set of keyboard shortcuts that corresponds (more or less) to the default shortcuts used in Adobe Illustrator? I've worked with Illustrator for years and the shortcuts are second nature to me; I'd like to use Inkscape but learning another set of shortcuts is not exactly appealing.

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Gsoc 2011 proposal - Implement KML-SVG translation
by David Xiong 05 Apr '11

05 Apr '11

Hi, I am applying to Gsoc 2011. I have submitted the proposal on line at: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/ywxiong/… The proposal is pasted below too. Would you kindly share any comments? I look forward to talking with the mentors of this project. Thank you. *Proposal:* *Implement KML SVG translation* Both SVG and KML are XML format data which can be used to present marks/paths/polygons/images on map shaped display. They have so many elements in common. SVG format is used on INKSCAPE but KML can be displayed on Google earth. It would be nice to have a tool to convert the two types of data files. Hence it can increase the popularity and generality of INKSCAPE. Since both of them are XML, the best way to transfer the two types of files is to utilize the xsltproc command within the libxslt library. This command reads and converts a defined XSLT transformation template to the desired XML format. The libxslt library has already been implemented and widely used in inkscape. Hence the task in this project is to implement the transformation template of XSLT file. However, there are a few things which need to be brought to our attention before getting started on the XSLT transformation template. 1. Both KML and SVG data can be compressed for saving space. To deal with compressed files, there is an existing library “zlib” in inkscape. It can be used to compress/decompress files to generate a proper format. 2. SVG data displays in 2 dimensions while KML is 3D. SVG data contains graphic effects such as filter, and animation, which is difficult to be represented in KML files. This means only partial information of the source file can be converted to the result file, such as points, images, polygons and lines, etc. 3. The speed of the xsltproc command is relatively slow when processing large data files. If possible, we need to implement some pre-processing logic to the conversion tool to improve performance. *Background and skills* *1. *Development experiences of GPS product for sail boats. This project was done in C++/MFC in windows and embedded c on a pre-designed portable device. The software on Windows could load KML files which contain the sailing waypoints info and it calculates the best sailing routes based on the waypoint info. The software could also send the KML waypoint info to the device via Bluetooth. This project involves the KML parsing, writing and processing. So, I have strong skills in XML and KML. I have done similar KML parsing in C/C++ before. I used Gzip for unzipping binary KML. This project seems relevant and achievable with my skills and experiences. *2. *Game development I worked as Software Engineer with a local company that is a leading game studio (Top 50 in the world) for over 2 years. They are very large games (e.g. NBA 09 Wii, FIFA 10) uses very similar architecture design with Inkscape. It uses C++ and makefile. After browsing Inscape source code, I found similar points to my experiences: - C++ Many years experience. - CMakeLists Research on digital image processing, using open source libs ITK and VTK which are using CMake and CMakeList. - XML GUI approach Experience from work. The internal build tools I used is a wxWidget application which loads the pre-defined XML format gui data. - Wxwidgets - Knowledge of SVG, a type of XML. Feel comfortable working on SVG, e.g. primitives, different shapes, text and fonts. Knowledge of SVG, KML, and open source development from both work and school. *Project goal* KML SVG translation via XSLT - For use of Inkscape with Google Earth or Maps Implement a XSLT template which could convert some useful info between KML and SVG, my current thought is like this: KML < ---- > SVG Points < ---- > circle/dot Lines < ---- > path Polygons < ---- > path Screenoverlay < ---- > image Implement C++ object to do the pre-processing to get rid of any unused nodes or elements, this could increase the performance of the xsltproc in the later step. Implement GUI for this tool. If I have time left, add the support for KMZ and binary SVG by using zlib. Quoted info form Inkscape wiki: Develop a translation (likely XSLT) between KML and SVG so KML files or icons can easily be created, edited, or viewed in Inkscape and for use in Google Earth or Maps. This becomes another piece in utilizing Inkscape's SVG editing capabilities in the geographical community ("geo" Inkscape). Several of us have discussed this as a potential Google Summer of Code project. I would be happy to serve as a mentor. *Implementation planning:* The general approach is to define a XSLT transformation template to convert between KML and SVG. Tool xlstproc will be used from libxlst which is in Inkscape code base already. Defining the convertible element list is the first thing. Eliminating unused nodes in the pre-processing step will increase processing speed or reduce the time. Design .inx files to create the GUI module. Tasks break-down: 1. define our convertible element list between KML and SVG 2. write the logic to eliminate the unused element --- two way 3. implement the template for each pre-defined elements. --- two way Write an internal extension for translating between KML and SVG Use source code in src/extension/internal/ as examples. Study XSLT, libxml2 and libxslt, and review existing code that currently uses them. Write .xsl templates for XSLT to store KML data and be ready to convert to SVG. Use /src/io/doc2html.xsl as an example. Conversion between .xsl templates and SVG. 4. GUI implementation Review existing input extensions (extension system) Study GTK+ and gtkmm source code. (I have done C and GTK+ before, so it should be quick.) Write .inx files with parameters to create GUI automatically 5. testing and bug fixing. 6. adding support for KMZ or binary SVG if have time *Schedule:* Assuming there are 14 weeks: Week 1-2: Communicate with mentor Learning code base and background Week 3: Define our convertible element list between KML and SVG Week 4-6: 2. write the logic to eliminate the unused element --- two way 3. implement the template for each pre-defined elements. --- two way Week 7-9: 4. GUI implementation Week 10-11: testing and bug fixing. Week 12-13: 6. adding support for KMZ or binary SVG Week 14: Debug and documentation *Inkscape Questions* I knew about Inkscape when I had a couple of SVG files to view. After that, I did lots of designs for better quality printing. It is very useful and free. It does many things that Illustrator can do. *About Yourself* · What is your name, email address, and irc nickname? My name is David Xiong. Email address: yunwxiong@...400... · Describe any plans you have over the summer in addition to GSoC, such as classes, a summer job, vacation plans, master's thesis, etc. No classes. Hope to get this project then I could focus something I am interested in. · What programming projects have you done so far? A lot projects from both school and work. From work, GPS project on the window and embedded system. Console game development, NBA live 09 Wii, Fifa 10 PC/PS2/PSP. · Have you worked on other open source projects before? If so, please list and describe what you did. not contribute, but have a lot experience with open source libs, such as ITK/VTK, zlib, NEMA lib, avrlib, Blackberry SDK, iphone SDK. I just work on my interests and my own small projects, such as developing tool in C# using ITK/VTK, zlib, Nema, libxml for the sailing software. My small games/apps on blackberry or iphone. · Please list other projects you are applying to for GSoC. One more Inkscape project. Best wishes, David.

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