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
