[Octave-bug-tracker] [bug #32980] for backend FLTK, real is used for axes. double should be used

[Ben Abbott]

Follow-up Comment #16, bug #32980 (project octave):

It should be possible to shift (and normalized?) the xdata, ydata, zdata,
cdata in __init_fltk__.cc.

A simple example from the command line that illustrates the problem for xdata
is below.


graphics_toolkit fltk
close all
figure (1)
xdata = datenum (2012, 02, 22, 18, 00, 00) : 0.01 : now;
ydata = sin (xdata);
ydata(2:2:end) = NaN;
plot (xdata (~isnan (ydata)), ydata (~isnan (ydata)))
datetick ("x", 13)


By offsetting the xdata by its median the problem by be resolved. After
running the commands above, add those below.


xtick = get (gca, "xtick");
xticklabel = get (gca, "xticklabel");
ytick = get (gca, "ytick");
yticklabel = get (gca, "yticklabel");
ztick = get (gca, "ztick");
zticklabel = get (gca, "zticklabel");

xoffset = mean (xlim ());
yoffset = mean (ylim ());
zoffset = mean (zlim ());

limits = axis ();
limits = limits - [xoffset*[1 1], yoffset*[1 1], zoffset*[1
1]](1:numel(limits));

for h = get (gca, "children")
  xdata = get (h, "xdata");
  ydata = get (h, "ydata");
  zdata = get (h, "zdata");
  xdata = xdata - xoffset;
  ydata = ydata - yoffset;
  zdata = zdata - zoffset;
  set (h, "xdata", xdata, "ydata", ydata, "zdata", zdata);
endfor

xtick = xtick - xoffset;
ytick = ytick - yoffset;
ztick = ztick - zoffset;
set (gca, "xtick", xtick, "xticklabel", xticklabel)
set (gca, "ytick", ytick, "yticklabel", yticklabel)
set (gca, "ztick", ztick, "zticklabel", zticklabel)

axis (limits)


Is this a proper approach ? 

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