March 2012 - Inkscape Devel - Inkscape Mailman

Re: [Inkscape-devel] Inkscape tiling interface redesign proposal
by Valerie 05 Mar '12

05 Mar '12

Awesome! Thanks for informing me! I've edited the wiki to make all the old images appear there. And thanks for providing the code too, I'm still rather unfamiliar with editing wikis! I'll re-add the description for the "Exclude tile exterior" feature tomorrow. ------------------------------ Message: 6 Date: Mon, 5 Mar 2012 14:52:02 +0100 From: Kris De Gussem <kris.degussem@...400...> Subject: Re: [Inkscape-devel] Inkscape tiling interface redesign proposal To: inkscape-devel <inkscape-devel(a)lists.sourceforge.net> Message-ID: <CADfUNqfuJ1BLsi9v47VuP1Tzg95rEi=-x3+y4fromKOY_W4Arw@...401...> Content-Type: text/plain; charset=ISO-8859-1 2012/3/5 Valerie <valerie_vk@...36...>: > Some time ago I was thinking up possible new interfaces for Inkscape's > > tiled clones function, and had compiled them here for now: > > http://wiki.inkscape.org/wiki/index.php/Tiling_tool Thanks for the update. Please note that image uploading on the wiki is again possible (I checked by uploading one of your linked images). Regards K.

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Re: [Inkscape-devel] Inkscape tiling interface redesign proposal
by Valerie 05 Mar '12

05 Mar '12

> My thoughts are that this is some very interesting work. Do I understand > correctly that your idea is to create (pretty advanced) guides on-canvas > depending on the select symmetry, and use those to define the base tile? > And then you want to be able to differentiate between "exterior" tiles > and "interior" tiles, with the "exterior" tiles tiling only so much that > they form a one-tile thick border around the tiles? Exactly! Of course, you can toggle on and off whether to delete tile "exteriors" for non-edge tiles. The "delete tile exterior" is mostly for the advanced seamless designs, not if you just want to toss around a few bubbles. > Have you thought about the interaction with things like random > displacements (and non-constant displacements). I admit I haven't thought that far... I'm not an expert in tilings, and even less in tiling algorithms, so I've never thought beyond "this connected to that." I guess it's possible, there are two separate options you can tick after all: - Make seamless tile - Exclude tile exterior as needed So, you could in theory tick the second box, and Inkscape will cut out the edges but still apply all the position and size transformations as needed. So the result doesn't need to be seamless. > Have you seen this java applet - designed to explore penrose tilings. > Its not guide based in the same way as yours but instead you manipulate > exemplars and see the result. You can see the interdependence and how > your guides might correspond to edges on these tiles. > Not sure if useful to you or not ? > http://www.cgl.uwaterloo.ca/~csk/software/penrose/ Thanks a lot for the link! That's actually a really good reference for how "guide points" are supposed to look (though... the tiles are different). In my version you can also create a guide point and drag out a segment, the both of which show up in other relevant sides. The idea is that they help create absolutely smooth transitions: just create a node on the guide point, and snap the node's handle to the edge of the segment guide. Repeat with the node's counterpart. Smooth transition! One thing that's bugging me is that users who don't want to create seamless tiles will probably want a generic rectangle tile to which they can apply any transformation they want, just to see which looks most interesting. But if you want to create a seamless tile, you have to define a specific guide from the start... Unless I just make guides and transformations to later apply independent. If you then apply a different transformation, that won't end up with a seamless design, that's your problem?

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Re: [Inkscape-devel] Inkscape tiling interface redesign proposal
by Valerie 05 Mar '12

05 Mar '12

Some time ago I was thinking up possible new interfaces for Inkscape's tiled clones function, and had compiled them here for now: http://wiki.inkscape.org/wiki/index.php/Tiling_tool Recently I've been giving some more thoughts to creating seamless patterns, in particular the "edge scenarios" of normal tiling. A lazy person (like me) would probably find it a pain in the neck to make new tiles for the edges and have to realign everything. What if you could define those edge scenarios in a single basic tile? In my tiling tool proposal, I proposed tile guides where you can add "guide points" and "guide point pairs" along the boundaries. Guide points drawn on one side will automatically appear on all the other relevant sides so you know where to connect. http://postimage.org/image/ae0dae6mh/ http://postimage.org/image/kqmnwh05l/ When you have nodes located on a guide point, applying "fuse tiles" automatically connects these nodes to the corresponding nodes on the next tile. So what if we make it so that all parts of the pattern Outside the basic tile gets cut away as necessary according to these guide points? Edge tiles however will retain the original extremities. The result: http://www.freeimagehosting.net/5e38w This concept can also be applied to radial tiling, for both rotation and resizing tiles: http://www.freeimagehosting.net/sbhmo I don't believe I've seen a program where you can easily create seamless tiles for all the different wallpaper groups, and this certainly makes things a little easier. Thoughts?

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Re: [Inkscape-devel] Powerstroke cusps
by Valerie 04 Mar '12

04 Mar '12

On the topic of Powerstrokes... applying Powerstroke to a group seems to crash Inkscape. Steps to reproduce: 1. Create two bezier paths 2. Group them 3. Apply Powerstroke to group (inkscape:5119): GLib-GObject-WARNING **: invalid cast from `SPGroup' to `SPShape' The idea was to first place the lines, then apply powerstroke to all of them to edit the line shapes afterwards... Do I start another bug report? Anyway, on the topic of cusps shapes: it's true that from a technical drawer's perspective, the result may seem too pointy, but maybe such users won't actually generate lines of that angle (thus shapes that pointy) when they're actually drawing. Just to say that we're all likely itching to try it out for ourselves. :P

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Bezier smoothness and antialiassing
by Stefan de Konink 04 Mar '12

04 Mar '12

Hi, First of all, although this email could be observed as a troll, I hope I can show that I want to improve stuff, not troll. My core (daily) automatic use of Inkscape is using it as renderer for a bulletingboard system. It runs over the last years 24x7, and I choose it because of the text-flow support. That said, we are moving to HD broadcast and the analogue smoothness is removed for 1080p sharpness. One of the core template designs uses a Bezier curve, imagine this as one side of a very tall egg. This surface, thick white border, is placed on dark blue. I am quite disappointed with the outline of the rendering of the curve. One of the topics I found today was at: <http://www.inkscapeforum.com/viewtopic.php?f=5&t=11451> The following blog entry mentions that cairo overdoes anti-aliassing, I also compared the Cairo output and rsvg's output. The curve is different, but is it really better? Not really. <http://libregraphicsworld.org/blog/entry/getting-crisper-text-out-of-inksca…> The Faq talks about 'Jagged edges'. Since my curves are insanely big, I don't believe it is impossible to get a visually better rendered curve. As example I have attached what I think the problems are with the rendering. From bottom I really get the curve that I want, its smooth and probably it is because about 3/4 pixels are used for overlap. The steeper the curve the less interpolation between step seem to happen as if the curve is defined at x=1, x=2, x=3, but the interpolation itself is only directional with the curve opposed to orthogonal with the adjacent content. Looking at the curve in outline mode, it also gives a glipse. One of the faq entries claimns you could work with a blur. I have tried a blur, and if you use it at 0.1 you basically achieve a very poor interpolated line. I would be interested what is possible with a border of 2,3 pixels wide converging to transparency. I wonder: - is it possible with one extra interpolation step to get a more visually attractive curve? - the faq mentions that pixel alignment is important, does this mean that the controlpoints, in all cases, must snap to the raster? [my own results with snapping are virtually the same] In a conversation at #cairo, some other suggestions where made such as gamma correct blending. From the rendering I saw here: <http://people.freedesktop.org/~sandmann/tigers/> I personally liked jinc the most. Stefan

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SVG security vulnerabilities
by Donna Benjamin 03 Mar '12

03 Mar '12

Hi all, Greg Knadison from the Drupal community just drew my attention to this presentation regarding the security issues associated with the SVG format. https://www.owasp.org/images/0/03/Mario_Heiderich_OWASP_Sweden_The_image_th… I thought it was very interesting, and others among you may also not have seen it before. cheers Donna -- Donna Benjamin - kattekrab.net Inkscape: Open Source Scalable Vector Graphics http://www.inkscape.org

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Ping Inkscape wiki User:Kris
by unknown＠example.com 01 Mar '12

01 Mar '12

First, thank you for the cleanup work you are doing on the wiki. It is much appreciated. Second, could you provide some content for User:Kris. It would be informative to know what brought you to the Inkscape project and what skills you intend to share. Once again, thank you for the work. It was needed.

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Fwd: Re: [CREATE] LGM 2012 workshop -- lib2geom
by Jasper van de Gronde 01 Mar '12

01 Mar '12

This came up on the CREATE mailing list, and I'm not sure how many people in Inkscape/lib2geom are reading that, so I'm forwarding it. Basically it has been suggested that it might be a good idea to have a lib2geom workshop at LGM, essentially to encourage people to use it (outside of Inkscape). -------- Original Message -------- Subject: Re: [CREATE] LGM 2012 workshop -- lib2geom Date: Thu, 1 Mar 2012 09:34:36 +0100 From: ale rimoldi <ale.comp_06@...2809...> To: create@...626... hi > Would any of our fabulous graphics programmers like to > have a workshop on using lib2geom at LGM? if somebody wants to make this true, he or she should submit a proposal to http://libregraphicsmeeting.org/2012/submit-a-talk today! ciao a.l.e _______________________________________________ CREATE mailing list CREATE@...626... http://lists.freedesktop.org/mailman/listinfo/create

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