[Scilab-users] A generic datastructure dump tool?

[Tim Wescott]

In addition to Samuel's suggestion, you can turn plotting off, modify
things, and then turn plotting on.  This vastly speeds up the process
because the graph is only getting redrawn once each iteration.

The syntax is:

scf(<your figure>);
drawlater();

< do your magic there >

drawnow();

This may even speed up things when you are using Samuel's suggestion.
It speeds things up that when I'm doing a simulation that has a lot of
check plots, the check plot code is usually written

scf(<target figure>)
drawlater();
clf;

< magic >

drawnow();

On Tue, 2016-03-29 at 07:31 -0800, scilab.20.browseruk at xoxy.net wrote:
> I've been fighting with SciLab's Graphics & GUI stuff for a week or so trying to arrange to have a line on a graph update its position in response to user manipulations of some controls (spinners or sliders) that adjust the coefficients of the polynomial the line of the graph represents.
> 
> I have a "working" version (and have had several others), but they all suffer from the same problem: namely that in order to redraw the line I have to redraw the entire graph, which defeats the point of the exercise which is to see how varying each of the coefficients affects the line. The process of re-draw is so slow that you can't see what changes.
> 
> To fix this, (I think) I need to delve deep into the gui/figure tree and bypass the high level calls to plot??().
> 
> Basically, I need to:
> 
> Arrange for the polyline that represent the polynomial to be drawn using pixel_drawing_mode:XOR.
> 
> And once the polynomial has been modified, re-draw (undraw) the previous line and the draw the new line again in XOR mode.
> 
> But, I'm having inordinate trouble trying to work out how all the different parts of a plot() draw figure tree fit together.
> 
> It would (I think) be very useful to be able to dump the entire tree of a plot figure as text so that I can work out at what level I need to intervene to achieve my goal.
> 
> But how to dump the tree to text?
> 
> Thanks, Buk
> 
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-- 

Tim Wescott
www.wescottdesign.com
Control & Communications systems, circuit & software design.
Phone: 503.631.7815
Cell:  503.349.8432