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Re: [Inkscape-devel] Filter effect and blur background
by Jasper van de Gronde 03 Apr '10

03 Apr '10

(This is regarding "discontinuities" appearing in blurs, when using BackgroundImage.) Ivan Louette wrote: > Thanks Jasper ! > > Try Yann's file I sent back ; it breaks some times and sometimes not... > > ivan I have indeed been able to reproduce the problem, and found a few copy-paste bugs in Gaussian blur (which normally wouldn't be triggered, and as such went unnoticed) in the process. But the real problem seems to be with the way in which the background image is accessed. In essence the background image doesn't take the area enlargement into account that is needed to correctly render the blur. To properly fix this would probably require a few more changes than I'm comfortable with at this stage in the release cycle, and could take a while anyway, so I've filed a bug (+associated rendering test): https://bugs.launchpad.net/inkscape/+bug/554649

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Re: [Inkscape-devel] GSoC - transformation anchors - before apply
by Zhenfeng Zhao 03 Apr '10

03 Apr '10

Hello, Thank you for all feedback a few days ago. I basically have some understanding about the project, which may allow me to start the proposal. In this weekend, I will write a proposal for the project, "Transformation anchors", with all information that I have got, and my ideas in planning. Should I submit it or send it to the mailing list for some feedback first? I will put some responses below... On Fri, Mar 26, 2010 at 8:01 PM, < inkscape-devel-request(a)lists.sourceforge.net> wrote: ------------------------------ > > Message: 4 > Date: Fri, 26 Mar 2010 20:18:02 +0100 > From: Pajarico <pajarico@...400...> > Subject: Re: [Inkscape-devel] GSoC - transformation anchors - before > apply > To: inkscape-devel(a)lists.sourceforge.net > Message-ID: > <ad4dc3fc1003261218k7b012d82o5b3d93308cfdcab5@...401...> > Content-Type: text/plain; charset=UTF-8 > > Hi, I'm the author of the specification. > @Z. Zhao > > I am interested in working on the "transformation-anchors" project in > GSOC this year. > > Good to hear! Welcome. If something on the spec is not clear just ask > on this mailing list. I'm not a coder but I might be able to help you. > I have the original SVG files of the GUI mock-up in case you want to > play with them. > > Hello Pajarico, It is a pleasure hearing from you. I would love to play with SVG files and GUI mock-up that you have. It would be great, if you can share them with me. Thank you. > For your consideration: there are two other projects related to this one: > * 1) adjust origin of coordinates of document > * 2) allow math operations (like sum, substraction, multiplication, > division) inside the spin boxes for Height, Width, X, Y; and now I > would add center of transformations. > Doing everything in just one run might be too much but try to keep them in > mind. > > > These projects seem very relevant. I definitely will consider them into the plan. I see the possibility to work on these after completing the transformation anchor project, perhaps one or both of them. If there is no time to finish all of these in three months, I will try to make sure on-going work is easy to do. After the three months of work, I may be interested to continue the work, if I have time. Basically, I will do some planning that includes all these relevant tasks. At some point later, it may become clear what can be done. > ------------------------------ > > Message: 5 > Date: Fri, 26 Mar 2010 23:09:30 +0300 > From: Alexandre Prokoudine <alexandre.prokoudine@...400...> > > On 3/26/10, Pajarico wrote: > > > * 2) allow math operations (like sum, substraction, multiplication, > > division) inside the spin boxes for Height, Width, X, Y; and now I > > would add center of transformations. > > Just steal code from GIMP 2.7.0+ :) > > Alexandre > > Cool. I guess I can do that. Stealing from open source is something that I have done for many times, both for Master thesis and at-work programs. Recently, I took some code for spline interpolations into my thesis. Taking code from Gimp should not be too difficult to me. Translating it into C++ is doable too. I do porting of different languages on daily bases. Regards, Zhenfeng.

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XDG User Dirs
by Krzysztof Kosiński 02 Apr '10

02 Apr '10

Hello While taking a stab at fixing the command line on Windows, I can also implement the XDG User Dirs specification, using relevant GLib functions. However, there is a slight problem with this: we currently look for user data (palettes, extensions, etc.) in the user's config directory, not in the data directory. The default user config directory on Unix is ~/.config, while the default user data directory is ~/.local/share. Is it OK to look in .local/share? We can automatically create a README in the config directory on the first run that tells the user to move his datafiles to ~/.local/share/inkscape. Regards, Krzysztof

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New memebr and a bug (maybe)
by CoD 01 Apr '10

01 Apr '10

Hello, I'm a 31 years old developer from Italy and I've been using Inkscape for years. I've just subscribed to this mailing list and.. yeah... I'm already here with a bug report :P Recently I experienced a strange behaviour with KDE 4 preview system and svg/svgz files saved with the last version of inkscape (both stable and devel version) so I decided to contact you. I hate duplicate/unclear bug reports so I would like to discuss this thing a bit with you before filing a bug to launchpad. So, let's try to explain what I've found System: Kubuntu 9.10 with KDE 4.3.2 Inkscape: devel version and 0.46 (See below) Reproducible: yes These are the steps I did: 1) I drew a simple icon with inkscape (a circle and a polygon) 2) I save it as svg or svgz (get the file here [1]) 3) The preview on my kubuntu 9.10 looks crazy (get the preview here [2]) as if nodes position has been screwed 4) I open the svg file with Inkscape 0.46 5) I change the color of an element and save again 6) The preview still looks crazy 7) I open the file again with Inkscape 0.46 but this time I move the polygon around, then I place it in the old position and save 8) The preview looks perfect, as if nodes position has been restored (get the file and the preview here [3][4]) I can't really understand what's going on here but seems that KDE 4 has troubles when previewing svg/svgz files saved with inkscape > 0.46 This happens also using ksvgtopng to convert an svg file to a png Could this possibly be related to bug 170049 [5] ? If you need more experiments just ask :-) Thank you Claudio Canavese (CoD) 1: http://cod-web.net/inkscape/devel.svgz 2: http://cod-web.net/inkscape/devel.png 3: http://cod-web.net/inkscape/046.svgz 4: http://cod-web.net/inkscape/046.png 5: https://bugs.launchpad.net/inkscape/+bug/170049

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Curve Sketching
by Ilya Baran 01 Apr '10

01 Apr '10

Hi, I've developed an algorithm for fitting smooth curves (the curves are like in Spiro, but piecewise-linear curvature) to user sketches. I'm thinking that this could be useful in Inkscape as a replacement or alternative to the current pencil tool algorithm. Compared to existing stuff, the benefit is that the curves are usually much nicer, the drawback is that it's a complicated algorithm and is slower--fitting a curve of moderate complexity will likely take about 1 second. Would the Inkscape devs be potentially interested in including this functionality? I'm looking into rewriting my research prototype to be faster, cleaner, more robust, and to remove proprietary dependencies. I can write the library that does the fitting, but I'm unfamiliar with Inkscape's code base, so I'd need help integrating it in. The time frame is that I'd likely be done with the library by the middle of summer. My paper with details and comparisons to existing methods (including Inkscape) at the end is at http://www.mit.edu/~ibaran/curves/ The reported timings can probably be improved by close to a factor of 2. Thanks, -Ilya

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Re: [Inkscape-devel] Curve Sketching
by Ilya Baran 31 Mar '10

31 Mar '10

Hi, Josh, Thanks for the quick reply. I think I'll go back on-list to avoid redundancy. > Hi, > > Off-list reply... > > Thanks for your interest in Inkscape! I will leave it to people more > familiar with our internals and the pencil tool to respond regarding > possible integration. :) > > After watching the video, I can say there is definitely an interesting > feature of your little demo app (besides the smoothing). That is the > reshaping of sections of paths based on where the beginning and end of a > stroke intersect with it (rather than node editing as Inkscape > requires). Yes, this is oversketching--it's not a new idea, but I haven't seen it implemented well in a full product (and my implementation in the prototype is not great either). Integrating this feature into Inkscape would be to a large extent a UI issue--and I'm not the best person to figure those out :) > Without having read the paper, what does this implementation look like > in terms of number of nodes/points created? We currently have a > smoothing option for the pencil tool, and when you choose to make it > smoother, it reduces the number of nodes used (and also reduces > accuracy). Yes, in producing the Inkscape examples, I tried tuning the smoothing option as well as I could. The central idea of my algorithm is to solve a global optimization problem explicitly minimizing the number of curve segments, subject to accuracy constraints, so in general it produces relatively few segments. The examples in the paper have the curve segments color coded, so you can see exactly which ones are produced. > Are you at all familiar with lib2geom? It is the geometry library that > Inkscape uses. In terms of curve fitting, I believe that would actually > be the project to integrate that piece into (since we could then utilize > it)... http://lib2geom.sourceforge.net/ I've briefly looked at the source code on SVN, but that's the extent of my familiarity. As far as I can tell, it's based on these S-basis things, to which I haven't been able to find a great introduction--I think I understand them well enough to conclude that converting my splines to this representation (approximately) should be relatively painless. Regardless, I want my library to be standalone (and I need, for example, Eigen for high-performance linear algebra--so I'll use it for vectors in general to make my life easier), but if it makes sense to interface with Inkscape through lib2geom, then that's the way to go. > I'd recommend checking out lib2geom if you have a chance, compiling it, > and checking out the many "toys" that it has... your demo video feels > somewhat like the toys that they create (basically the proof of concept > before things are attempted in Inkscape). Will do. -Ilya

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Moving ahead in inkscape development..
by Abhishek Sharma 31 Mar '10

31 Mar '10

Hello all, I had previously introduced myself as a GSOC 2010 aspirant. I am devoting myself to the idea of c++ifying(in Object Oriented manner) the inkscape code. For that I am trying to move into the code and traversing, but due to its vastness am facing problems in it. I got hold of a very old bug, "Y Scale inversion" -> https://bugs.launchpad.net/inkscape/+bug/170049. As i have seen the heat on this, this bug is of a very wide scope and so can actually help me to involve myself with *much* of the inkscape codebase. So it is my urgent and honest request to inkscape developers as well as corresponding GSOC mentors to just direct me as to where in the code I should start tracking and removing the bug. I will be glad. Thanking You. Yours sincerely, -- Abhishek Sharma B-Tech Information Technology Indian Institute of Information Technology(Amethi Campus)

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Filter effect and blur background
by Yann Papouin 31 Mar '10

31 Mar '10

Hi, Please first take a look at this picture composited in photoshop: http://ftpmerou.free.fr/inkscape/blur-background.png I tried to reproduce the same effect in inkscape easilly, and i made it by using a copy of the picture, bluring it and applying a mask with a shape to simulate the effect: http://ftpmerou.free.fr/inkscape/blur-background-fakebymask.svg It's ok now, but I thought about filter effects (background image can be used as a connection link in the filter editor) and saw this: http://www.w3.org/TR/SVG/filters.html#AccessingBackgroundImage On http://wiki.inkscape.org/wiki/index.php/Filter_Effects there is a note about this property "There's no GUI for setting the enable-background property. This property has to be set on some parent layer of filtered object to make Background Image and Background Alpha input images work." Does the background image support is implemented? Do you think that the same effect can be achieved with filters by applying the effect on a shape (that will blur its background content)?

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Set enable-background by default
by Ivan Louette 31 Mar '10

31 Mar '10

It's easy ! Create a template and place it in Inkscape templates directory. I did it and even replaced my default template with it. ivan

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Re: [Inkscape-devel] Re : Re : Filter effect and blur background
by Yann Papouin 31 Mar '10

31 Mar '10

Wow, amazing, no layer tricks, really thank you Ivan http://ftpmerou.free.fr/inkscape/blurbackground-4.png http://ftpmerou.free.fr/inkscape/blurbackground-4.svg Why "enable-background:new" is not set by default ? 2010/3/31 Ivan Louette <ivan_louette@...48...> > Try this one. It only uses one layer set on "enable-background:new" as > indicated by Niko > > ------------------------------ > *De :* Yann Papouin <yann.papouin@...400...> > *À :* Ivan Louette <ivan_louette@...48...> > *Cc :* Niko Kiirala <niko@...1267...>; > inkscape-devel(a)lists.sourceforge.net > *Envoyé le :* Mer 31 mars 2010, 10 h 01 min 02 s > *Objet :* Re: [Inkscape-devel] Re : Filter effect and blur background > > Thank you Ivan, your template is exactly what I want (but I didn't change > the layer blending mode, it must be normal to work properly) > See a preview here: > > http://ftpmerou.free.fr/inkscape/blurbackground-2.png > http://ftpmerou.free.fr/inkscape/blurbackground-2.svg > > Artifacts can be annoying but it might be fixed later, maybe they are due > to the IIR Filtering method added in 2007? > > By the way, the layer with the "background property" cannot be renamed, > changes are not made in the svg. > >

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