Hi all: I achieve something like this, IE plotting on top of the image of a map, with perl/PDL and the plplot MEM driver. I first use a PDL plotting routine to create an RGB memory image to pass to the MEM driver.
I'm not sure if this is exactly what you want, but it might help. --Doug On 2/6/16 2:28 PM, Alan W. Irwin wrote: > On 2016-02-06 10:09-0000 Phil Rosenberg wrote: > >> Hi Greg >> Sorry I haven't replied earlier. Jim may have to confirm this. But > it sounds like what you are aiming to do isn't really supported by > Plplot. Basically it sounds like you are trying to add your own > graphics commands (i.e. Draw the background) part way through a > replot. Although that can work for direct drawing there is currently > no way to intercept the drawing part way through. That said i think > that for drivers where the user has access to the "canvas" this > possibly should be supported. I also think that adding some form of > drawing an rgb image would be good too. Alan do you think these are > things we should consider adding to the API? > > Hi Phil: > > If you are talking about the goal of having potentially different RGBA > images for each different page's background, then I really like that > long-term goal because you can get some really cool effects that way. > But I am concerned about the speed since it currently takes us an > extremely long time to display even a low-resolution image for example > 20. So I encourage you to think about the image display speed issue. > For example, I presume many of our device drivers (e.g., cairo, qt, > and wxwidgets) potentially could display an image using the > (presumably fast) capabilities of the underlying pango/cairo, Qt[45], > and wxwidgets libraries. So I think one potential way forward is to > implement that "native" image rendering capability in each of those > device drivers (and others as well whose underlying library has the > native capability). Then plimage lets the driver render the image if > the driver advertises it has the capability, and otherwise falls back > to the extremely slow current method of displaying images. > > Meanwhile, I have thought of a closely related topic concerning the > "A" in "RGBA" which I would like to discuss which is how to improve > our current methods of handling uniformly coloured semitransparent > backgrounds. But I will present my thoughts on that topic in a > separate thread so as not to hijack this one. > > 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); the Time > Ephemerides project (timeephem.sf.net); PLplot scientific plotting > software package (plplot.sf.net); 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 > __________________________ > > ------------------------------------------------------------------------------ > Site24x7 APM Insight: Get Deep Visibility into Application Performance > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > Monitor end-to-end web transactions and take corrective actions now > Troubleshoot faster and improve end-user experience. Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 > _______________________________________________ > Plplot-devel mailing list > Plplot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/plplot-devel ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
