Very helpful. Appreciate your explanations. Thanks, srini On Sun, Nov 14, 2021 at 8:00 PM Alan W. Irwin <alan.w.irwin1...@gmail.com> wrote:
> On 2021-11-14 15:00-0500 R Srinivasan wrote: > > > Newbie here. Using PlPlot bindings of Ada. > > > > I am trying to create 2 plots to fit on the same page - as in the Real > and > > Imaginary components of a complex signal. > > > > When I use the png output - only the first plot is ever seen. Same with > jpg > > outputs. On the other hand, when pdf output is used 2 different pages are > > in the file and they contain the 2 plots. > > > > Example 2a appears to do something similar and the results are as > outlined > > above. > > > > My platform is Windows with mingw64 > > > > Clues appreciated. Thanks, Srini > > Hi Srini: > > First some background. > > In general (i.e., this is an external requirement) some graphics > file types (e.g, PNG, JPEG) don't allow multiple pages while others > (e.g. PDF) do allow multiple pages. > > PLplot works around that external issue for modern file device drivers > by providing an option to generate separate files for each multiple > page. This concept is called familied files, and for more details > about that please look at > < > http://plplot.org/docbook-manual/plplot-html-5.15.0/devices.html#familying > >. > > By the way, for the PNG format I would highly recommend using either > the pngcairo device or the pnqqt device. If you build your own PLplot > those devices should be available for MSYS2 (which fully supports the > cairo and Qt libraries which those devices depend on). On the other > hand, I would not recommend using the png device since that is > deprecated. > > I think that backgrounds answers why you are getting different paging > results for different devices. But to answer your specific question, > it appears you are trying to generate separate plots for a single page > (e.g., like <http://plplot.org/examples.php?demo=01>), and my guess is > you ran into the paging difficulties because of some mistake in your > code (e.g., forgetting to call plstar) that generated multiple pages > rather than just your desired single page with multiple plots. > Anyhow, if that is the case, please take a look at that example to see > what to do for the multiple plot per page case. > > Cheers, > > Alan > __________________________ > Alan W. Irwin > > Research affiliation with the Department of Physics and Astronomy, > University of Victoria, Victoria, BC, Canada. > > Programming affiliations with the FreeEOS equation-of-state > implementation for stellar interiors (freeeos.sf.net); the Time > Ephemerides project (timeephem.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 > __________________________ >
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