May 2013 - Inkscape Devel - Inkscape Mailman

Re: [Inkscape-devel] Perfect bound cover extension on Windows
by Chris Mohler 08 May '13

08 May '13

On Wed, May 8, 2013 at 9:08 AM, john Culleton <John@...1202...> wrote: > Slackware comes on a DVD which includes both the standard > installation and an "extras" directory. There is also the > slackbuild site that has pointers to the files needed but I wasn't > able to make that work. There is no equivalent to apt-get etc. http://www.slackware.com/~alien/slackbuilds/python-lxml/ Chris

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Bug #1060837
by Arshdeep Singh 08 May '13

08 May '13

Dear Josh, I have been working on the bug #1060837: https://bugs.launchpad.net/inkscape/+bug/1060837 (Please go through the link to know about the bug) The bug involves depicting the CMS values of a CMYK using Color Space on a scale of [0,100] rather than the default [0,1]. I have up till now setup un-editable GtkEntry Values which shall depict the values that the artist wants ( on the 0 to 100 scale ). Here is a screen-shot: [image: Inline image 1] *I am facing to problems: *1) How to distinguish that a CMYK based color-space is selected ? I am accessing the Colorspace through the ColorProfile object like this- if( asICColorSpaceSig(newProf->getColorSpace() ) == cmsSigCmykData ) { _cmsCMYK = TRUE ; } else { _cmsCMYK = FALSE ; } I have placed this snippet in appropriate places (_setProfile function, _profileChanged function etc ). But nothing seems to really work . Am I using the correct equality condition ? Can you help in this ? [ _cmsCMYK is a bitfield [ gboolean _cmsCMYK : 1 ] added to the sp-icc-color-selector.h file or Color Selector class as a flag to keep track of only CMYK color spaces.] 2) How to setup a GtkEntryBuffer for the GtkEntries I have drwan for the artist ? I wrote a small function: char* getAdjustmentVal (GtkAdjustment *_adj) { gdouble _val=gtk_adjustment_get_value (_adj); _val=100.00*_val; guint _corrVal= _val; char* arr; itoa( _corrVal, arr, 10 ); return arr; } then I used: gtk_entry_buffer_set_text( ....) https://developer.gnome.org/gtk3/3.4/GtkEntryBuffer.html#gtk-entry-buffer-s… but I end of getting runtime errors. The sequence of loading the data before drawing the widget to screen is correct. But I get runtime errors. Maybe because the set text function requires a const array. Any suggestions on that ? What changes are required in the function ? -- Arshdeep Singh Third Year, Computer Engineering Delhi Technological University Ph: +91-9654115614 https://sites.google.com/site/adsingh1729/home

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tablet input became laggy since r12292
by Yale Zhang 08 May '13

08 May '13

Hi, I'm using the latest snapshot builds of inkscape (one on Skydrive) and after upgrading from r12292 to r12322, my Wacom Intuos 5 now has major lag problems. This isn't the 1st time I've had lag. Previously, I've encountered this problem in both the Windows x64 versions of Inkscape and Gimp. https://bugzilla.gnome.org/show_bug.cgi?id=696148 Somebody suggested a workaround of downgrading libcairo from 1.12 to 1.10, and that worked. But I see that even the no-lag r12292 version is using libcairo 1.12, so it now seems less likely that Cairo is the root cause of the lag. There only seems to be 25 changes since r12292, but I'm not that familiar with Inkscape internals yet. Can someone suggest what could've went wrong? Thanks, Yale

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Bug #1060837
by Arshdeep Singh 07 May '13

07 May '13

Dear Josh, I have been working on the bug #1060837: https://bugs.launchpad.net/inkscape/+bug/1060837 (Please go through the link to know about the bug) The bug involves depicting the CMS values of a CMYK using Color Space on a scale of [0,100] rather than the default [0,1]. I have up till now setup un-editable GtkEntry Values which shall depict the values that the artist wants ( on the 0 to 100 scale ). Here is a screen-shot: [image: Inline image 1] *I am facing to problems: *1) How to distinguish that a CMYK based color-space is selected ? I am accessing the Colorspace through the ColorProfile object like this- if( asICColorSpaceSig(newProf->getColorSpace() ) == cmsSigCmykData ) { _cmsCMYK = TRUE ; } else { _cmsCMYK = FALSE ; } I have placed this snippet in appropriate places (_setProfile function, _profileChanged function etc ). But nothing seems to really work . Am I using the correct equality condition ? Can you help in this ? 2) How to setup a GtkEntryBuffer for the GtkEntries I have drwan for the artist ? I wrote a small function: char* getAdjustmentVal (GtkAdjustment *_adj) { gdouble _val=gtk_adjustment_get_value (_adj); _val=100.00*_val; guint _corrVal= _val; char* arr; itoa( _corrVal, arr, 10 ); return arr; } then I used: gtk_entry_buffer_set_text( ....) https://developer.gnome.org/gtk3/3.4/GtkEntryBuffer.html#gtk-entry-buffer-s… but I end of getting runtime errors. The sequence of loading the data before drawing the widget to screen is correct. But I get runtime errors. Maybe because the set text function requires a const array. Any suggestions on that ? What changes are required in the function ? -- Arshdeep Singh Third Year, Computer Engineering Delhi Technological University Ph: +91-9654115614 https://sites.google.com/site/adsingh1729/home

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Another GSoC'er - New From Template
by Jan Darowski 07 May '13

07 May '13

Hi! I'm Jan Darowski, form Poland, studying IT at the Warsaw University. Launchpad, IRC nick Slagvi. As for now I've developed few apps (mainly with Qt), but couldn't find a nice way to get into open source development (although I use it all the time). And here appears GSoC. I chose Inkscape because I often see many cool, free projects, which have even better functionality than commercial ones but for some reason they aren't as popular. I think that it's caused by less friendly, simple interface. I'm attending an Inkscape Internet course on my university and find it really nice and interesting project, which in many places can be improved. Later on I saw, that there's a very strong, active community what I find very important. I chose to implement an old New From Template idea, as it looks like something improving reception of inkscape (especially for the new and very advanced users). It is also a well documented and described idea, so I believe that not only I find it important. Of course I already did required two patches, trying to choose these related with the subject. I already have some ideas/plans how to implement this idea but first I want to know if there aren't any more suggestions from the other developers. And here are the the questions for you guys: 1. Is it still as important idea as I think? Maybe there is something more urgent what you can suggest to me? 2. As the ideas blueprint suggests ( https://blueprints.launchpad.net/inkscape/+spec/new-from-3. template-dialog) there has been some work done about this idea but I cannot find anything about what has been done and where it is. 3. Is there any support for the procedural templates written? That's another mentioned functionality I cannot find. Is it so important? Without very deep research in this direction I think It can require a lot of work to do it from the beginning. Maybe even to much as for the GSoC, as there are also other things to be done during this period. As for now, I'm thinking about focusing on making a simple dialog, which covers current functionality + searching by tags + categorizing templates (things from wiki http://wiki.inkscape.org/wiki/index.php/NewFromTemplateSpec). As there will be a nice "New From Template" dialog, maybe I should also add one for creating templates? It shouldn't be very difficult, just another type of save dialog, with some additional template-specific fields and adding them into svg file.

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Perfect bound cover extension on Windows
by john Culleton 07 May '13

07 May '13

I have since found the messsage. In essence it says I must download and install http://cheeseshop.python.org/pypi/lxml That in turn requires that I download using a package called "pip" which I don't have. Or I can build from source, but that requires that I have libxml2 and libxslt including header files. This is indeed a man-sized can of worms to get a function that should be included with the base system. I also have a Debian partition up which has Inkscape 47 on it. If the "pip" path fails I will try upgrading Debian to wheezy which may have a newer version available. It would be nice if the developers of Inkscape would provide a source package for Linux that had all the requirements bundled in. -- John Culleton Wexford Press Free list of books for self-publishers: http://wexfordpress.net/shortlist.html PDF e-book: "Create Book Covers with Scribus" available at http://www.booklocker.com/books/4055.html

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GSoC project proposal: Inkscape as an electronics CAD tool
by Sebastian Götte 03 May '13

03 May '13

Hi, I'm Sebatian from Berlin. I have used Inkscape for a few years now and I have a project proposal on how to make Inkscape a full-blown electronics CAD tool with only few special-purpose additions. I have written some software before[1,2,3] and contributed to other open-source projects[4,5]. I have registered a blueprint with my proposal at [6]. The spec can be found in the wiki at [7]. Here is the overview from the blueprint: Currently there is no nice open source electronics CAD tool. The largest competitors are gEDA which I find awkward to use and KiCad which I find even more awkward to use. Since a schematics editor is not much more than a special-purpose flow graph editor and a PCB layout editor is in fact nothing but a somewhat crippled vector graphics editor with some special-purpose features added I think it is very promising to modify a general purpose vector graphics editor to support the few special-purpose functions additionally required by an electronics CAD tool. Your comments are welcome :D Sebastian [1] https://github.com/jaseg [2] https://github.com/jaseg/cerebrum [3] https://github.com/jaseg/python-lmap [4] https://github.com/git/git/commit/d5fec92a7af5c42217f3d1c707191791230bdefc [5] https://github.com/jaseg/i3lock/commits/master [6] https://blueprints.launchpad.net/inkscape/+spec/electronics-cad [7] http://wiki.inkscape.org/wiki/index.php/SpecElectronicsCAD

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GSoC 2013: Depixelizing Pixel Art
by Vinícius dos Santos Oliveira 02 May '13

02 May '13

Hi Inkscape Developers, I'm Vinícius dos Santos Oliveira and I'm majoring in computer science at Universidade Federal de Alagoas, Brazil. I'm not very skilled, but I use (and like) the Inkscape software for some time ( http://vinipsmaker.deviantart.com/gallery/?catpath=/ ). I have experience with GUI programming and C/C++/Python/..., so I think I can develop to Inkscape. I'll try to fix some "easy-fix" tagged bugs next week. I thought about an idea for a GSoC proposal and I wanna know your opinion about this idea. Inkscape currently use potrace for all raster-to-vector conversions, but potrace isn't good to work with pixel-art. Some reasearchers developed an algorithm that perform better with pixel-art: http://research.microsoft.com/en-us/um/people/kopf/pixelart/ My proposal would be to develop an C++ library implementing this algorithm and: 1. Create an cli program using this library 2. Integrate the feature in Inkscape using this library The main tasks to implement this algorithm are: - Construct a graph - Reshape the graph with the help of some heuristics defined in the paper - Extract the spline curves - Optimize the curve - Convert the B-Splines curves to Bézier curves The library should export the curve as B-Splines and Bézier curves. This way, if Inkscape gain support for B-Splines curves in the future, it should be easy to convert the filter to generate the B-Splines instead of Bézier curves. After finish the proposal, Inkscape should have another option to convert raster images. I'm already used to a lot of programming languages and programming paradigms and programming skills won't be a problem for me. Graphs wouldn't be a problem for me either (I have some background on data structures and related). I would take more time to master B-Splines and Bézier curves, but I don't think this should take more than two weeks. If I finished this proposal fast enough, I could even add extra features like add an option to pre-proccess the input with hqx filter before send it to the cited algorithm. You can see some demos of the algorithm at http://research.microsoft.com/en-us/um/people/kopf/pixelart/supplementary/i… and the results are amazing. -- Vinícius dos Santos Oliveira https://about.me/vinipsmaker

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Text drawn to screen where? (Pango splitting text fields excessively for other output.)
by mathog 02 May '13

02 May '13

Layout-TNG-Compute figures out glyphs, spans, etc. for screen output. But when and where is that information actually drawn to the screen? I have been working on EMF, R->L output and various other things, and discovered that Pango sometimes really goes to town breaking text fields into smaller "unbroken spans". These are necessary for screen display, since it must find a glyph/font pair for each unicode character, but some of the results are overkill for the "print" output functions, which typically need to know where the resulting glyph is, but most likely do not really care what (substitute) font was used. That is true for EMF output, and presumably for the other supported output formats as well. Example, when the following 7 unicode characters are entered, all in Arial font: (a) (grave accent) (b) (acute accent) (c) (circumflex accent) (d) pango_itemize breaks it into 3 pieces: (a) (grave accent) (b) (acute accent) (c) (circumflex accent) (d) because Arial (on the test system) did not have a glyph for circumflex, so it fell over to DejaVu Sans. These 3 smaller pieces are then fed one by one into pango_shape() and etc., until the information is ready for the screen. This is all well and good for screen display, but the same graphics structure is also used for "print" output (other than SVG, I think). The second fragment, in particular, is likely to be mishandled by whatever reads the file output, since that is a Mark, nonspacing unicode character, and should always follow a normal character in the same text record. In the print context the font substitution used within Inkscape is irrelevant for the construction of the output file. In all likelihood no or a different font substitution may take place in the target system. Breaking text strings that are in one "tspan" in the original SVG, down into several in other output formats, is certainly not the desired result! To work around this problem layout-Compute would need to keep two sets of books, as it were: setting up the fragments that eventually go to the screen, and the simpler set of fragments that go to print. The glyph<->character map is the same, but the print spans are merges of 1 or more screen spans. Inkscape would need to make a distinction between drawing to the screen, and drawing to a file, and send the appropriate set of spans to the appropriate target. Near as I can tell, at present it just sends the same structure to both destinations. (This effect is not seen with SVG output, because nstead of working from the screen's graphics structures, it just saves the stored XML.) Regards, David Mathog mathog@...1176... Manager, Sequence Analysis Facility, Biology Division, Caltech

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Trunk builds for Fedora
by Ryan Lerch 02 May '13

02 May '13

I have started doing builds of RPMs from Inkscape trunk for Fedora 17, 18 and 19: http://repos.fedorapeople.org/repos/ryanlerch/inkscape-unstable/ I don't have a cronjob for this, so they aren't nightly builds, but i hope to keep it fairly up-to-date. cheers, ryanlerch

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