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Ruby Cairo bindings
by MenTaLguY 07 Nov '04

07 Nov '04

Just for fun tonight I wrote a Ruby binding for Cairo, so I can learn my way around it more. If anyone's morbidly curious, it's in CVS under mental/cairo-testbed in the experimental module. More details: The Ruby extension is in the cairo/ subdirectory; the cairo-testbed directory proper will contain some scripts and things that use it (right now it just contains a simple demo script, demo-0.rb, that generates a PNG). To build the extension, just run: ruby extconf.rb make The binding is moderately complete at this point; the only two areas I've not really covered yet are fonts and patterns, and I need to expose more surface types (currently only in-memory and PNG output surfaces are exposed). In terms of the major classes at this point: * Cairo - a cairo graphics context * Cairo::Surface - a cairo drawing surface * Cairo::Transform - AKA Cairo::Matrix, a matrix representing an affine transformation In general the way things work are that you create a cairo context, set a target surface for it to draw on, and draw away, calling show_page when you're done. require 'cairo' File.open("foo.png", "wb") {|port| ctx = Cairo.new ctx.target_surface = \ Cairo::Surface.new_png(port, Cairo::FORMAT_ARGB32, 200, 200) # fill in the background ctx.new_path ctx.rectangle(0, 0, 200, 200) ctx.set_rgb_color(1.0, 1.0, 1.0) # white ctx.fill # draw a big X ctx.new_path ctx.move_to(20, 20) ctx.line_to(180, 180) ctx.move_to(20, 180) ctx.line_to(180, 20) ctx.set_rgb_color(0.0, 0.0, 0.0) # black ctx.line_width = 5 ctx.line_cap = Cairo::LINE_CAP_ROUND ctx.stroke ctx.show_page # write the PNG } -mental

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Re: [Inkscape-user] Feedback 0.40pre1
by MenTaLguY 07 Nov '04

07 Nov '04

On Sat, 2004-11-06 at 20:01, bulia byak wrote: > > - Like 0.39, very large paths (4000 nodes) are very slow, especially during > > zoom and when I go into node-edit-mode (inkscape spends a lot of time drawing > > stuff that's off-screen). > > Yes it's a problem. We need to do more optimization in one of the > future versions. I have some specific ideas for algorithms to reduce the repainting burden. I'll try to document them sometime soon. Strictly speaking, when performing individual node edits it should only be necessary to redraw maybe four path segments at most. -mental

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visible, printable, SVG
by Peter Moulder 07 Nov '04

07 Nov '04

The Object Properties dialog box has properties Visible and Printable. Currently, we map Visible in the Object Properties dialog to SVG's visibility attribute, while we use a custom attribute for Printable. When would in-inkscape visibility differ from on-paper visibility? - Visible on screen but not printable for guide lines/shapes. - Printable but not hidden [or 90% transparent?] on screen for temporary editing convenience. I'd guess that the user wants the same things to be printable as they want to be exported to PNG or generally visible as part of the image to be seen by viewers. If "seen by viewers" includes the use of other SVG agents (e.g. use of a command-line tool for printing or exporting to another format, or embedding in e.g. HTML before printing), then that suggests we should use SVG's visibility property for Printable, and use custom data to indicate what things are currently visible/hidden. Comments? pjrm.

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set guides
by David Christian Berg 07 Nov '04

07 Nov '04

Hey guys, how do I put a guide to a specific position? The guides dialog only sets the guide's relative position. I need absolute positioning most of the time, but haven't found the property in the preferences dialog. David

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layer progress
by MenTaLguY 07 Nov '04

07 Nov '04

bulia's gotten layer locking/unlocking and show/hide from the layer selector working now in CVS. Give it a spin and see if you can find any remaining bugs~ -mental

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ghost spikes
by bulia byak 06 Nov '04

06 Nov '04

Now the biggest problem with the calligraphy tool is the ghost spikes - sudden long and thin spikes that burst sometimes from the stroke sideways. They are actually visible, unlike the ghost spikes of the pencil tool. Apparently they are caused by the same reason, since both tools use the same bezier fitter. Peter, have you had any progress on this issue? Can you look into the calligraphic spikes as well?

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calligraphy fun + new screenshots
by bulia byak 06 Nov '04

06 Nov '04

Until yesterday, I considered Inkscape's calligraphy tool pretty useless. It was too weird and not really suited for any real work. It turns out I was wrong. The problem with this tool was that its most useful mode - flat nib - was disabled and there was no UI to enable it. As a result, the Angle control had no effect because the "pen" was actually more of a "brush". I fixed this, and even made the transition from flat to round a gradual one, controlled by the new Flatness control (0 = round nib, 1 = flat nib). (Actually 0 is not "round", but the pen is always rotated perpendicular to the stroke direction; any suggestions for a better term?) I also added a Thinning control which tells how much to change the width of the stroke depending on velocity (0 = uniform width, >0 makes faster strokes thinner, <1 makes faster strokes broader). I also changed the defaults of the rest of the parameters. With these changes, the tool is now capable to do some real calligraphy. All of this screenshot was done entirely in Inkscape using a Wacom tablet: http://inkscape.org/screenshots/gallery/inkscape-0.40-CVS-linux-calligraphy… Other screenshots added today: tracing, text on path, tutorial, and a work screenshot from David Christian Berg. Enjoy, and don't forget to send us your screenshots! http://inkscape.org/screenshots/index.php

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layers again
by bulia byak 06 Nov '04

06 Nov '04

I added manually <g id="l1" title="Layer1" label="Layer1" inkscape:groupmode="layer"> ... </g> around the content of a file. Two problems: - on open, it shows (root). I think we agreed that if there's a single layer it must be entered on load if there's no current layer remembered in namedview? - it shows #l1 so title and label are ignored. What is the way to set the visible title apart from id?

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interview - KDE Dot News
by Arpad Biro 06 Nov '04

06 Nov '04

Hi, dot.kde.org has an interview with a guy called Bryce Harrington. Here: http://dot.kde.org/1099664490/ __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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gradient display bug
by David Christian Berg 06 Nov '04

06 Nov '04

this is a _really_ annoying bug... when you have several texts with gradients or (or is just one enough?) you'll very fast end up with broken gradient display in the text. I just tried just writing some text, adding a gradient, changing the gradient, doublicating the text, moving the doublicate. and "peng" the original object has a totally broken gradient displayed... Can anyone confirm? my build is a few days old, it's not since long, that this bug has been introduced, I'm sure. David

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