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[Octave-bug-tracker] [bug #44567] Qt graphics toolkit displays twice whe


From: Dan Sebald
Subject: [Octave-bug-tracker] [bug #44567] Qt graphics toolkit displays twice when opening a new figure via plot or image.
Date: Thu, 19 Mar 2015 05:40:13 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:18.0) Gecko/20100101 Firefox/18.0 SeaMonkey/2.15

Follow-up Comment #2, bug #44567 (project octave):

Much better.

The reason I thought it happened with plot as well is that I tried the example
from bug https://savannah.gnu.org/bugs/?44564


A=diag(2*ones(19,1))+diag(-1*ones(18,1),-1)+diag(-1*ones(18,1),1);
spy(A)


and noticed that the plot is shown twice.  But that is because there is an
axis() command that follows the plot:


  if (isnan (markersize))
    plot (j, i, line_spec);
  else
    plot (j, i, line_spec, "markersize", markersize);
  endif

  axis ([0, n+1, 0, m+1], "ij");


I tried changing the spy.m code so that there is only one draw, e.g., passing
properties into plot(), placing axis() before plot().  Maybe changing a figure
property so that drawing is not done immediately.  Couldn't find anything, but
it sure seems like such a technique should be possible.

    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?44567>

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