Re: [Plplot-devel] Cairo Driver Family
On Jun 3, 2007, at 7:30 PM, Alan W. Irwin wrote: On 2007-06-03 18:20-0400 Hazen Babcock wrote: Hello, I've added the Cairo driver family to PLplot. This includes: xcairo (formally known as xwinttf). pdfcairo (PDF) pscairo (PS) svgcairo (SVG) pngcairo (PNG) memcairo (MEM) Known issues: 1. If you have Cairo but not X Windows your build will likely fail since I still haven't solved the pre-processor directive problem I mentioned Yesterday. 2. The svgcairo driver does not display text properly. I'm not really sure what to do about this one since it seems to be an issue with the cairo library. 3. The pngcairo driver does not support multiple pages. You only get one page, which is the last page that you drew. This could be fixed by having the driver generate multiple files, say my-graph.png, my- graph-2.png, etc... I don't think the PNG format itself supports multiple page output. That is correct. The way this is taken care of for the png device (as well as jpeg and gif) for gd.c is to use the normal PLplot familying facility (see http://plplot.sourceforge.net/docbook-manual/plplot-html-5.7.3/ output-devices.html#familying). It's a bit tricky to set up, but if you follow what is done for gd.c, you should be fine. I thought you might have inadvertently set up familying already simply by following what is done in gd.c, but apparently not since the -fam command-line option only gives the same last page of example 8 that you get without the option. Ok. I'll implement this approach. 4. The memcairo driver is untested. It appears that a side effect of a call to plsmem is to force PLplot to use the mem driver. An attempt to overide this behavior by calling plsdev(memcairo) after the plsmem call but before plinit was unsuccessful. 5. Plots output by the pscairo driver do not fit the page, i.e. there is a largish white margin on two sides of a plot. All the drivers are off by default so you will have to turn them on to test them, if you are so inclined. I didn't bother with memcairo, but I built all the rest with no build errors on Ubuntu Dapper. I have only done the most superficial tests of the built results, but I immediately noticed two issues on Linux beyond what you mentioned. (1) the 'ldd -r cairo.so' test showed the following problems: undefined symbol: cairo_ps_surface_create (./cairo.so) undefined symbol: cairo_pdf_surface_create (./cairo.so) undefined symbol: cairo_svg_surface_create (./cairo.so) It's fairly urgent to solve these problems since it excludes any testing of the pscairo, pdfcairo, or svgcairo devices on Linux. Maybe this is because I have Cairo v1.2.6 and debian testing is v1.2.4? According the cairo docs these functions have been in the library since 1.2. (2) ./x08c -dev xcairo shows only the first page of that example. Hm. On OS-X I get a bus error. It is interesting that it works fine if you just type ./x08c and then choose the driver. -Hazen - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
Re: [Plplot-devel] Cairo Driver Family
On 2007-06-04 21:17-0400 Hazen Babcock wrote: On Jun 3, 2007, at 7:30 PM, Alan W. Irwin wrote: (1) the 'ldd -r cairo.so' test showed the following problems: undefined symbol: cairo_ps_surface_create (./cairo.so) undefined symbol: cairo_pdf_surface_create (./cairo.so) undefined symbol: cairo_svg_surface_create (./cairo.so) It's fairly urgent to solve these problems since it excludes any testing of the pscairo, pdfcairo, or svgcairo devices on Linux. Maybe this is because I have Cairo v1.2.6 and debian testing is v1.2.4? According the cairo docs these functions have been in the library since 1.2. Actually, my platform is Ubuntu Dapper (released almost exactly a year ago) which has version 1.0.4 of the cairo library. So that explains the missing symbols for my platform. Note, _some_ Ubuntu Dapper platforms are going to be around for a long time since Canonical plans to support it for 3 years on the desktop (and 5 years on the server). However, I am not sure the majority of desktop users will actually use Ubuntu Dapper that long since even a one-year old Linux desktop is already way out of date thanks to the huge pace of change for Linux development. (A case in point is this already old libcairo version for Ubuntu Dapper). For example, I plan to move to Debian testing as soon as I can find the time to do the install. That's the best background I can give you about how relevant libcairo-1.0.4 will be in the future, and I will let you be the judge whether you want to support this older version of libcairo or not. I hope to install debian testing some time this summer after I finish my current research project, and after that old libcairo versions won't be an issue for me. (2) ./x08c -dev xcairo shows only the first page of that example. Hm. On OS-X I get a bus error. It is interesting that it works fine if you just type ./x08c and then choose the driver. ./x08c -dev xcairo now actually pretty much works for me. I finally figured out that you should hit CR in the xterm where that command-line is typed and not the GUI (at least when threading is not turned on). Now that I know how to run it, ./x08c -dev xcairo shows some issues. (1) The 3D labelling needs work on the transformation to determine the rotation and slew of each letter. I thought there was now standard code in the plplot library for that? Or is it a bug in that standard code? (2) Memory management issues Here is the associated error message (after I hit one additional CR after the last page of example 8 is displayed) *** glibc detected *** double free or corruption (!prev): 0x08050358 *** Unless there is some internal problem in the Ubuntu Dapper libraries (this is possible since these are old versions of each library) it sounds like your code might be trying to free something that has already been freed. 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 __ - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
