- Inkscape Devel - Inkscape Mailman

Re: Firefox 1.1 SVG support
by John Taber 16 Apr '05

16 Apr '05

Well, I have my article half-written on using Inkscape for web page graphics but someone beat me to it on the state of browser support: http://svg.org - it's a pretty good read. But the even bigger news is the announcement above it that Firefox 1.1 will have SVG turned on. Great News !

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[bryce@...260...: Re: Inkscape on our covermount CD]
by Bryce Harrington 15 Apr '05

15 Apr '05

FYI ----- Forwarded message from Bryce Harrington <bryce@...260...> ----- Date: Fri, 15 Apr 2005 14:57:00 -0700 From: Bryce Harrington <bryce@...260...> To: Konstantin Breyer <kbreyer@...787...> Subject: Re: Inkscape on our covermount CD Mr. Breyer, Thank you for contacting us. Yes, Inkscape is available under terms such as these, and I will review the license this weekend and fax a signed confirmation of the terms to you by Monday. Thanks, Bryce On Thu, Apr 14, 2005 at 06:44:41PM +0200, Konstantin Breyer wrote: > D ear Sir or Madam, > > > > your Software Inkscape on our covermount CD: COMPUTERBILD, Europe's biggest > PC magazine, is going to attach a CD/DVD-ROM to one of its next issues. We > would like to record your software free of charge on this CD/DVD-ROM. The > software versions on the CD/DVD-ROM will be explained in the magazine and > will possibly also be presented and explained on our internet page > "www.computerbild.de". Thus, your product will be presented to more than 4 > millions of readers (MA 2004 I) and many enthusiastic users of the internet > - for that reason your software will get a high amount of attention. > > > > Join in. For the sake of good order, please fax the signed license agreement > (please delete inapplicable terms) back to us (+49/40/34 724 710) and e-mail > me the system requirement sheet. > > > > Kind regards, > > > > Mit freundlichen Gr??en > > Konstantin Breyer > Axel Springer AG > Redaktion COMPUTERBILD > Leitender Redakteur Software > > Telefon +49 (0) 40 - 34 72 34 52 > Mobil +49 (0) 151 - 12 70 88 23 > > Telefax +49 (0) 40 - 34 72 47 10 > E-Mail kbr@...787... <mailto:kbr@...787...> > Internet <http://www.computerbild.de/> http://www.computerbild.de > > Besucheradresse: > Caffamacherreihe 1 > 20350 Hamburg > > Diese E-Mail und eventuelle Anlagen k?nnen vertrauliche und/oder rechtlich > gesch?tzte Informationen enthalten. Wenn Sie nicht der richtige Adressat > sind oder diese E-Mail irrt?mlich erhalten haben, informieren Sie bitte > sofort den Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren > sowie die unbefugte Weitergabe dieser Mail sind nicht gestattet. > > This e-mail and any attachments may contain confidential and/or privileged > information. If you are not the intended recipient (or have received this > e-mail in error) please notify the sender immediately and destroy this > e-mail. Any unauthorized copying, disclosure or distribution of the material > in this e-mail is strictly forbidden. > ----- End forwarded message -----

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General-purpose projective transforms
by Bob Jamison 15 Apr '05

15 Apr '05

Hi, I saw on the web a CS course paper by a Prof Chuck Stewart of RPI, about a simple mechanism for achieving projective transforms. http://www.cs.rpi.edu/~stewart/math_vision/lec9.pdf Basically you take 4 corners of a rectangle (like the corners of a selection marquee), a, b, c, d. Move one or more of the points to a', b', c', d'. Calculate the transform of the points (and the rectangle they describe) to the new points. Apply this to the selected object(s). Once this generalized projective transform is working, it can be specialized to its various subclasses, such as perspective, affine, shear, skew, etc. An easy way to achieve this, IMHO, would be to constrain their movement via the keyboard. Does this appear to be a valid new feature that we might want? Bob Here is a textified snippet of the paper: Projective Transformations ========================== The study of transformations and their properties (especially their invariants) is fundamental to geometry. o A projective transformation is an invertible mapping that preserves colinearity. o Projective transformations are also known as homographies, projectivities and colineations. o Projective transformations may be represented by a 3x3 invertible matrix: x' = Hx Note that H is determined up to an arbitrary scale factor so it has 8 degrees of freedom. o The perspective projection of a planar surface in the world reduces to a plane homography. The composition of two homographies is also a homography. Thus, two different images of a planar surface are related by a homography. --- These facts explain our practical interest in homographies. o Even though the matrix is 3x3, this is still a transformation of two-dimensional objects. Example: Computing Projective Transformations ============================================= Suppose we have an image of the face of a building that has severe perspective distortions. If we know, for example, the dimensions of a window or door that appears in the image, we can compute a transformation that removes these distortions. o Suppose the width of the door is w and the height is h. Let the ratio be r = h/w. o Find the four corners in the image. Call the locations x1 through x4. o Designate four locations for these to map to: (0, 0, 1)T, (1, 0, 1)T, (0, r, 1)T, and (1, r, 1)T Note that we are creating an arbitrary Euclidean coordinate in the image. o These four "correspondences" allow us to compute a unique transformation, H. o We apply this transformation to the entire image. It undoes the effects of the projective distortion. Projective Transformations of Lines and Conics ============================================== o Using the basic result x' = Hx we can calculate the perspective transformations of lines and conics. o Lines transform as l' = H(-T)l where H(-T) is the inverse of the transpose of H. o Conics transform as C' = H(-T)CH(-1). o Dual conics transform as C*' = HC*H.

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Re: [Inkscape] svgslice 0.8
by Jon Phillips 15 Apr '05

15 Apr '05

On Tue, 2005-04-12 at 17:36 +0100, Lee Braiden wrote: > Hi all, > > Hope it's OK to post here :) Actually, the announce list is only for announcing Inkscape releases, so ppl. will probably get annoyed if other things get announced here. It is better to post to Inkscape-devel list. > Just wanted to let you all know that I've released a little python-based tool > for Inkscape that slices up files for use as web graphics. It doesn't yet > generate (useful) HTML for you, but it's already quite flexible. > > It has two different engines, so it can slice simple stuff based on ruler > guidelines you quickly drag across an image, or if you need something more > complex, you can create a special "slices" layer, with rectangles showing > where each slice should be. Be sure to hide the slices layer before actually > slicing, since the rectangles will be rendered in your slices otherwise*. Cool.... > There is some future potential too: it could conceivably do much of what > integrated slicers do (set file format for each slice etc.), thanks to the > low-level XML access that Inkscape allows. > > Available at: http://www.digitalunleashed.com/giving.php > > Hopefully some of you will find this useful. Personally, I hate working with > bitmap programs for web design :) Yes, I agree. I *highly* recommend you work with Aaron Spike and Ted Gould to make this into an extension. This would be very useful to people to make websites. I know I would use it. Plus, that way your tool would get more exposure and could possibly be included with our releases...your software is GPL, so things should be in order. > * It'd be great if there was some way to disable particular layers when > calling inkscape from the shell for rendering. Doable, but maybe mental or Bulia could respond to this better. I've replied to you and to the inkscape-devel list where these discussions normally take place. Cool idea to implement this...someone else on this list talked about doing this earlier, so maybe there are others that could help you out. Jon -- Jon Phillips USA PH 510.499.0894 jon@...235... http://www.rejon.org Inkscape (http://inkscape.org) Open Clip Art Library (www.openclipart.org) CVS Book (http://cvsbook.ucsd.edu) Scale Journal (http://scale.ucsd.edu)

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"COMPUTERBILD"?
by Bryce Harrington 15 Apr '05

15 Apr '05

Hi all, I've been emailed by someone from a magazine called "ComputerBild", that is said to be popular in Europe. Could someone confirm for me that it exists? Bryce

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Errors and warnings
by Jon A. Cruz 15 Apr '05

15 Apr '05

"The time has come," the Walrus said, "To talk of many things: Of shoes--and ships--and sealing-wax-- Of cabbages--and kings-- And why the sea is boiling hot-- And whether pigs have wings." so... we do have many things to deal with. g_log... g_warning... fprintf(stderr... magic dialog output... What's the plan for a grand unification of this all? First, there are a few classes getting setup that would appear to deal with this. When should each be used, and where. Second, what should the messages be? What are the rules for the types, contents, internationalization, etc. Not sure if this best starts here on the list, or on the Wiki. I've setup a stub page to get filled in eventually. http://www.inkscape.org/cgi-bin/wiki.pl?ErrorsAndWarnings

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Pssssst
by Jon A. Cruz 14 Apr '05

14 Apr '05

Pssssssst... shhhh... Try dragging off of color swatches now. :-)

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Re: [Inkscape-devel] inx files
by unknown＠example.com 13 Apr '05

13 Apr '05

On Thu, 7 Apr 2005 aaron@...749... wrote: > Perhaps I will have to learn to read C++ sooner than I had wanted to. :) > Is there a DTD? Well, there isn't. This is partially for two reasons: 1) I'm lazy 2) I don't know how to (see 1) If you'd write one, I'd maintain it as I make changes to the format (should be pretty stable at this point though). I think that I've heard XSchema is better, but I don't know enough about them. > > As far as passing to scripts, how do you want it? We've discussed it in > > the past, but it never got implemented. I was thinking something like > > "./myscript --name=value" > > That is exactly what I would expect. Okay, I'll get on to adding that. > > but as the most active script developer, how > > ever you'd like would be germane in my eyes. > > A very sad commentary on the state of the art, don't you think? :) Yes, but I don't blame people. It is still a black art without enough functionality to do really cool things. That is starting to change though. --Ted

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Re: [Inkscape-devel] Effects on Win32
by unknown＠example.com 13 Apr '05

13 Apr '05

Sending this again because I never saw it come through on the list. ted@...11... wrote: > On Tue, 12 Apr 2005 aaron@...749... wrote: > >>Ok. I spent a little more time on this. In script.inx file, this works >>on Linux: >> >><command reldir="extensions">script.py</command> >> >>And this works on Windows: >> >><command reldir="path">python "C:\Path\To\Script\script.py"</command> >> >>What is the proper syntax for a write once run anywhere *.inx file? > > Well, I think that the problem is that we don't have one. I'm open to > suggestions. Does that mean that Windows won't execute the #! at the top > of files? Windows uses an association between file extension and applications that is stored in the registry. I have a bunch of random thoughts/questions: -with option one can Inkscape be taught to call the script in such a way that windows can choose the interpreter properly (and function with pipes)? -what other platforms will have special nuances that need to be delt with? -with option two could the inkscape extensions directories be added to a search path environment variable (like java classpath) that is used by the interpreter to avoid absolute paths? -Could inkscape be given a more flexible way to construct the command line? eg. <interpreter reldir="path">python</interpreter> <scriptfile reldir="extensions">script.py</scriptfile> would yeild 'python "path to script/script.py" params...' -Could scripts run on the embedded interpreter? Aaron Spike

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Effects on Win32
by unknown＠example.com 12 Apr '05

12 Apr '05

Has anyone tried to use effects on Win32. I tried it at work today and failed. When I try to run a script I get: ** (inkscape.exe:2648): CRITICAL **: file extension/implementation/script.cpp: line 586 (virtual void Inkscape::Extension::Implementation::Script::effect(Inkscape::Extension::Effect*, SPView*)): assertion 'mydoc != NULL' failed I'm having great difficulty diagnosing whether it fails before or after running the script. Is it supposed to work? Aaron Spike

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