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Re: [Inkscape-devel] Calligraphy Pen
by bulia byak 10 Apr '04

10 Apr '04

>So really, I should look at how the free hand tool builds up a path. Which >code is that? The freehand tool itself is in draw-context.cpp (first half only, up to "pencil context") but it calls functions in helper/bezier-utils.cpp to create beziers from points obtained from the mouse. _________________________________________________________________ Add photos to your messages with MSN Premium. Get 2 months FREE* http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=ht…

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Re: [Inkscape-devel] Calligraphy Pen
by bulia byak 10 Apr '04

10 Apr '04

>Do you guys want to work on top of the code in dyna-draw-context.cpp that >turns the users motions into a bezier path, or do you have plans for a new >path-to-bezier algorithm? As I explained, that tool creates simple closed paths that have no idea of mid-path or widths array. They are just closed paths with black fill, you can only edit their edge nodes. As such, they're hard to edit after they're drawn and therefore almost useless. What I've been proposing is a more usable approach where you have a midline path and an array of widths, and the final closed path gets calculated from them and updated automatically when you edit the midline or widths. The current dyna-draw code may help in developing this algorithm, but by itself it's a dead end IMHO. It's not worth to develop it further in its current state. One other thing that dyna-draw does is implements some advanced realtime smoothing with "drag", "mass", etc. This applies to the algorithm for transforming your mouse movements into a path (which would become the midline path in the new tool). Some people in our team are already working on making the current freehand tool produce smoother lines, and probably the result of their efforts will be good enough for the new calligraphic tool as well, even without "mass" or "drag" stuff. Maybe, or maybe not. _________________________________________________________________ Tired of spam? Get advanced junk mail protection with MSN Premium http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=ht…

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Re: [Inkscape-devel] Calligraphy Pen
by bulia byak 09 Apr '04

09 Apr '04

>Can you tell me more about how the calligraphy tool turns the path you draw >into a sequence of beziers? If you mean the current calligraphy tool (Ctrl+F6), then I have no idea. It was coded by a person who is not in the Inkscape team now. Try to research the code in dyna-draw-context.cpp. _________________________________________________________________ STOP MORE SPAM with the MSN Premium and get 2 months FREE* http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=ht…

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Re: [Inkscape-devel] Calligraphy Pen
by bulia byak 09 Apr '04

09 Apr '04

>You could implement the width as another bezier 'stroke' in 'thickness >space' - that way there would be continuous change in the width of the >stroke, and it could be magnified and rerendered without loss. I will work >on this and present a formula for a broad edge calligraphy pen, since the >relationship between thickness and other factors is so simple. After I >get a look at the code you guys are using now, I can figure something out >for that, too. A sequence of beziers in "thickness space" will indeed give you smooth thickness function and may require less data to store (i.e. you can use less samples). Still, I think what is _stored_ for a stroke should be just an array of widths, which can then be rendered either as a polygon (for quick renders), or as an automatic beziergon where all the points are smooth points on a path of beziers (for quality renders). Using such an array will allow us to represent both "geometric" (elliptical, triangular etc) stroke shapes as well as totally random strokes, e.g. with thickness information coming from a tablet pen pressure. The tricky part is the algorithm: given a midline path (a sequence of lines and beziers) and the thickness array, produce a closed path representing the final stroke. This algorithm should deal satisfactorily with sharp turns and any other oddities in the input data. Once we have it, adding a new object type to Inkscape and some UI for it is more or less trivial. _________________________________________________________________ Free yourself from those irritating pop-up ads with MSn Premium. Get 2months FREE* http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=ht…

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Re: [Inkscape-devel] oops
by bulia byak 09 Apr '04

09 Apr '04

>Is there a new, public cvs, with the ps export issue being fixed? 0.38.1 _________________________________________________________________ MSN Premium: Up to 11 personalized e-mail addresses and 2 months FREE* http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=ht…

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cvs commit
by Arpad Biro 09 Apr '04

09 Apr '04

Hi, I'm trying to commit Daniel's new translation (finally the downloading of patches started to work), but cannot do it. What happens is (with po/ being the working directory): # cvs -d:pserver:a_b@...54...:/cvsroot/inkscape login Logging in to :pserver:a_b@...54...:2401/cvsroot/inkscape CVS password: # cvs -d:pserver:a_b@...54...:/cvsroot/inkscape commit cvs commit: Examining . Log message unchanged or not specified a)bort, c)ontinue, e)dit, !)reuse this message unchanged for remaining dirs Action: (continue) cvs [server aborted]: "commit" requires write access to the repository Arpad Biro __________________________________ Do you Yahoo!? Yahoo! Small Business $15K Web Design Giveaway http://promotions.yahoo.com/design_giveaway/

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oops
by bulia byak 09 Apr '04

09 Apr '04

Looks like we need 0.38.1. Postscript export crashes, as reported by two people already. It's caused by yesterday's last minute blunder. This fix is simple: in src/extension/internal/ps.cpp, line 271, replace g_free(fn) with g_free(local_fn). Please someone redo the tarball!!! _________________________________________________________________ Free yourself from those irritating pop-up ads with MSn Premium. Get 2months FREE* http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=ht…

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Re: [Inkscape-devel] Calligraphy Pen
by bulia byak 09 Apr '04

09 Apr '04

> > I'm interested in adding another calligraphy tool. The old calligraphy tool is not only inconvenient to use, it's bad because it produces shapes with fill instead of strokes, which are very difficult to edit afterwards. We've been contemplating introducing a new Inkscape object type which would store the midline of the path you draw (as a sequence of beziers) and a function that gives the stroke width for each point along the path. That way, you'll be able to tweak the path (midline) and it will still keep the shape (widths). The width function may be just an array of width values for all points at some step distance from each other along the path, with the stroke shape approximated as a polygon based on these values. I think a calligraphy pen implemented via this object will not only be much more convenient to use, but also much easier to implement. The only problem is that the "shaped stroke" object is not implemented yet, it needs to be coded. Depending on your programming experience, you could participate in working on that object so you can later use it for a new calligraphy tool. I'm Cc:ing Nathan Hurst with whom we've discussed the shaped stroke idea. _________________________________________________________________ MSN Premium: Up to 11 personalized e-mail addresses and 2 months FREE* http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=ht…

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stroke tips cut off
by David Christian Berg 09 Apr '04

09 Apr '04

I just submitted bug 932254. When the angle of the corner of a shape is small enought, you notice, that the tip of the stroke is cut off. What is wierd about it, is that no matter how you rotate the object, the tip is always cut off vertical and horizontal. It seems like there was a bounding box for the object, outside of which the stroke is not drawn anymore. Have a look at the picture I submitted with the bug report. Take care David

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Re: [Inkscape-devel] stroke tips cut off
by bulia byak 09 Apr '04

09 Apr '04

>For me, this picture is blank. Mozilla and curl both give me an empty >file. It seems to be a Sourceforge problem. All tracker attachments are blank. _________________________________________________________________ Free yourself from those irritating pop-up ads with MSn Premium. Get 2months FREE* http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=ht…

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