Re: [Plplot-devel] qt text positioning
Hi everyone, Alan W. Irwin wrote: On 2009-03-13 19:27- Andrew Ross wrote: That explanation makes sense. Thanks! In fact, KDE-4.2 has a much better reputation than KDE-4.1 so these color/text position rendering issues for -dev svg results (as well as other SVG results) may already be resolved by KDE-4.2. That explains it, indeed, I'm still under Kde 4.1. Good news. In any case, I now feel we shouldn't worry too much about svgqt until the fundamental validation issues get straightened out for the SVG files produced by Qt4 so I now have disabled svgqt by default. The remaining big concern for me is still the size issues for all the other qt-related devices. * Would you be willing to go through the same xdpyinfo and GUI measuring exercises (with an actual meter stick) I asked Alban to do to make sure we all have dimensions and resolutions configured right on our various Linux systems, X configurations, and monitors? I get the following: dimensions:1440x900 pixels (304x190 millimeters) resolution:120x120 dots per inch Your resolution is 80x80 dpi, which should explain the discrepancy. I believed the sizes were computed relatively to the device resolution, but I must have omitted something at some point. I'll have a look at it. * For -dev pngqt do you get the ~20 per cent smaller glyphs I do or the normal-sized glyphs like Alban does? * For -dev qtwidget do you get the half-size glyphs I do or the normal-sized glyphs like Alban does? (For the last two questions please refer back to the screenshots we both recently sent to the list.) Thanks in advance for your help with these qt glyph size questions. It will be a big help to know what the situation is for each of the Linux platforms you have access to. Alan __ Alan W. Irwin And thanks to all for the relevant analysis of the SVG and memory issues. Alban -- Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are powering Web 2.0 with engaging, cross-platform capabilities. Quickly and easily build your RIAs with Flex Builder, the Eclipse(TM)based development software that enables intelligent coding and step-through debugging. Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com ___ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
Re: [Plplot-devel] qt text positioning
On 2009-03-13 11:47- Alban Rochel wrote: Alan, Alan W. Irwin wrote: I applied the subsequent patch you sent to remove all special SVG text offsets. (Revision 9730.) The resulting svgqt text placement is not correct on konqueror so there may indeed be a bug in the Qt library in the way they produce (as opposed to view) SVG files with text. I have included the following screenshots of the second page of example 2 so that you know exactly what I am looking at. I've compared what I get to what you produced, and the results are... interesting :0 (1) -dev pngcairo results as viewed by the ImageMagick display application (which unlike SVG's gives reliable results for text positioning within PNG's). The glyphs appear to be well centred in their boxes (just like all other cairo results including svgcairo as displayed by konqueror). Same thing for me (2) konqueror result for -dev svg. If you stare really hard at it, you will notice that result is off centre to the left compared to the first screenshot, but the effect is just barely noticeable so we didn't bother to correct it for -dev svg. I have to open the file in Inkscape to get the same output as you. In konqueror, see the attachment (svg_in_konqueror.png). Offset, color, font, nothing is right! My konqueror version is ir...@raven konqueror --version Qt: 3.3.8b KDE: 3.5.10 Konqueror: 3.5.9 One of the nice things about -dev svg is we are completely in control of that device driver since there are no external library dependencies. For -dev svg results we have checked out text positioning on a whole bunch of different platforms/applications, and got consistently good results except for (a) anything having to do with librsvg, and (b) old software versions (e.g., Scribus versus Scribus_ng). Steve Schwartz provided many of these results so you will want to check with him. It's possible your konqueoror version is older than mine. On the other hand it may be newer, and there may be some text positioning bug (and text color bug) introduced in the new version. I also get good -dev svg results for iceweasel (a.k.a. firefox). It's version here is Mozilla Iceweasel 2.0.0.14, Copyright (c) 1998 - 2008 mozilla.org Do your firefox results look good for -dev svg? If so, I would stick with firefox (or inkscape) for testing of -dev svgqt. [...]Depending on what software I use, I get different (wrong) results, but still different from yours! (svgqt_in_konqueror.png svgqt_in_inkscape.png). Firefox gives the same thing as Inkscape (they may have the same rendering engine, I haven't checked). Well, my bad results with konqueror and your bad inkscape results (both for application versions that produce good -dev svg results) for -dev svgqt indicate Qt issues with producing svg results. That lead me to a further test which indicates bad trouble with Qt and SVG. I just tried to validate -dev svgqt results at http://validator.w3.org/ via the file upload method. There are three errors. The first is that it cannot automatically detect that it is svg. So I specified svg 1.1. After that override it detected 2 svg validation errors (for qttest02.svg, the second page of example 2 generated by -dev svgqt). If you do decide to file a bug report with qt, these validation issues should be addressed with the highest priority since there is no excuse for QT to produce SVG results tht are not compliant with the standard. Meanwhile, I don't think we should be concerned about other errors in the svgqt results until the validation issues are fixed. I have disabled svgqt (revision 9736) to discourage users from further testing of this device because of these known issues that require non-PLplot (Qt) work to fix. Note, both -dev svgcairo and -dev svg produce results that are cleanly validated by that site. (4) -dev pngqt result as displayed by ImageMagick display. The position is too high, but the shift is small so you may not want to fix that. The size of the characters is consistent with those from -dev svqqt, i.e., they should be expanded by ~20 per cent or so to be consistent with the size of the characters from -dev svg On my system, it's better, but the font is wrong (sans-serif): pngqt.png Actually, I think the font choice is fine. Comparing your pngqt result with mine, I think they use identical san-serif fonts (but different sizes) for the second page of example 2. Visual inspection of the numbers block displayed by gucharmap with different system fonts seems to give a good match with Arial which is a sans-serif font. A similar gucharmap experiment with the pngcairo results for the same page indicates DejaVu Sans was used in that case. So both the pango and qt glyph choosing systems are coming up with sans fonts in both cases, and I think that is the best we can expect unless and until we configure fontconfig to use the same criteria as Qt for choosing sans glyphs or vice versa. So I think the only
Re: [Plplot-devel] qt text positioning
On Fri, Mar 13, 2009 at 12:09:07PM -0700, Alan Irwin wrote: On 2009-03-13 11:47- Alban Rochel wrote: Alan, Alan W. Irwin wrote: I applied the subsequent patch you sent to remove all special SVG text offsets. (Revision 9730.) The resulting svgqt text placement is not correct on konqueror so there may indeed be a bug in the Qt library in the way they produce (as opposed to view) SVG files with text. I have included the following screenshots of the second page of example 2 so that you know exactly what I am looking at. I've compared what I get to what you produced, and the results are... interesting :0 (1) -dev pngcairo results as viewed by the ImageMagick display application (which unlike SVG's gives reliable results for text positioning within PNG's). The glyphs appear to be well centred in their boxes (just like all other cairo results including svgcairo as displayed by konqueror). Same thing for me (2) konqueror result for -dev svg. If you stare really hard at it, you will notice that result is off centre to the left compared to the first screenshot, but the effect is just barely noticeable so we didn't bother to correct it for -dev svg. I have to open the file in Inkscape to get the same output as you. In konqueror, see the attachment (svg_in_konqueror.png). Offset, color, font, nothing is right! My konqueror version is ir...@raven konqueror --version Qt: 3.3.8b KDE: 3.5.10 Konqueror: 3.5.9 Alan, I can answer this on Alban's part based on earlier emails. Kubuntu 8.10 uses KDE 4. Qt: 4.4.3 KDE: 4.1.4 (KDE 4.1.4) Konqueror: 4.1.4 (KDE 4.1.4) This version is definitely a work in progress - not all apps have been ported to KDE4 yet, so it is certainly possible that bugs have been introduced. Andrew -- Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are powering Web 2.0 with engaging, cross-platform capabilities. Quickly and easily build your RIAs with Flex Builder, the Eclipse(TM)based development software that enables intelligent coding and step-through debugging. Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com ___ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
Re: [Plplot-devel] qt text positioning
On 2009-03-13 19:27- Andrew Ross wrote: On Fri, Mar 13, 2009 at 12:09:07PM -0700, Alan Irwin wrote: On 2009-03-13 11:47- Alban Rochel wrote: Alan, Alan W. Irwin wrote: I applied the subsequent patch you sent to remove all special SVG text offsets. (Revision 9730.) The resulting svgqt text placement is not correct on konqueror so there may indeed be a bug in the Qt library in the way they produce (as opposed to view) SVG files with text. I have included the following screenshots of the second page of example 2 so that you know exactly what I am looking at. I've compared what I get to what you produced, and the results are... interesting :0 (1) -dev pngcairo results as viewed by the ImageMagick display application (which unlike SVG's gives reliable results for text positioning within PNG's). The glyphs appear to be well centred in their boxes (just like all other cairo results including svgcairo as displayed by konqueror). Same thing for me (2) konqueror result for -dev svg. If you stare really hard at it, you will notice that result is off centre to the left compared to the first screenshot, but the effect is just barely noticeable so we didn't bother to correct it for -dev svg. I have to open the file in Inkscape to get the same output as you. In konqueror, see the attachment (svg_in_konqueror.png). Offset, color, font, nothing is right! My konqueror version is ir...@raven konqueror --version Qt: 3.3.8b KDE: 3.5.10 Konqueror: 3.5.9 Alan, I can answer this on Alban's part based on earlier emails. Kubuntu 8.10 uses KDE 4. Qt: 4.4.3 KDE: 4.1.4 (KDE 4.1.4) Konqueror: 4.1.4 (KDE 4.1.4) This version is definitely a work in progress - not all apps have been ported to KDE4 yet, so it is certainly possible that bugs have been introduced. That explanation makes sense. Thanks! In fact, KDE-4.2 has a much better reputation than KDE-4.1 so these color/text position rendering issues for -dev svg results (as well as other SVG results) may already be resolved by KDE-4.2. In any case, I now feel we shouldn't worry too much about svgqt until the fundamental validation issues get straightened out for the SVG files produced by Qt4 so I now have disabled svgqt by default. The remaining big concern for me is still the size issues for all the other qt-related devices. * Would you be willing to go through the same xdpyinfo and GUI measuring exercises (with an actual meter stick) I asked Alban to do to make sure we all have dimensions and resolutions configured right on our various Linux systems, X configurations, and monitors? * For -dev pngqt do you get the ~20 per cent smaller glyphs I do or the normal-sized glyphs like Alban does? * For -dev qtwidget do you get the half-size glyphs I do or the normal-sized glyphs like Alban does? (For the last two questions please refer back to the screenshots we both recently sent to the list.) Thanks in advance for your help with these qt glyph size questions. It will be a big help to know what the situation is for each of the Linux platforms you have access to. Alan __ Alan W. Irwin Astronomical research affiliation with Department of Physics and Astronomy, University of Victoria (astrowww.phys.uvic.ca). Programming affiliations with the FreeEOS equation-of-state implementation for stellar interiors (freeeos.sf.net); PLplot scientific plotting software package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project (lbproject.sf.net). __ Linux-powered Science __ -- Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are powering Web 2.0 with engaging, cross-platform capabilities. Quickly and easily build your RIAs with Flex Builder, the Eclipse(TM)based development software that enables intelligent coding and step-through debugging. Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com ___ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
