Alban said: > As for your suggestion of using an overloaded repaint(), I'm afraid it's not that easy, as any call to the plot function will cause the whole buffer to be "replayed" anyway.
I did an experiment replacing the call to repaint() by a call to update(). The result was that example 17 with -dev qtwidget was as fast as with -dev xwin. Of course, you lose all animation then and only get a snapshot of the last completed result because unlike repaint (which is specifically for the animation case), update drops intermediate results. So to me that experiment proves repaint is the sole bottleneck that causes the animation speed issue (at least with the present design). I don't understand your argument above concerning replaying the whole buffer since the whole point of repainting just the relevant rectangle is to avoid changing anything else in the plot that is displayed. Thus, it seems to me if you use the overloaded variation of repaint supplied by Qt4 that only repaints what has changed (i.e., it limits itself to just a small rectangle that you specify when there is only one added point) the result has to be a lot faster. However, you know a lot more about Qt4 than I do so if I am missing something (and repainting a small region is no faster than repainting the whole plot) please explain where my analysis is going wrong. 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 __________________________ ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
