Re: Animations with image size matching output resolution

[Daniel J S. <dan...@ie...>]

Here's a resulting patch for 

I've added a demo.  A new animation that spins the globe around.  So there is an "animate2.dem" combining the concepts of animate.dem and world2.dem.  I've also rewritten "animate.dem" and "gnuplot.rot" slightly.  So that I could reuse gnuplot.rot, I've made it generic as follows:

zrot=(zrot+zrot_delta)%360
xrot=(xrot+xrot_delta)%360
set view xview(xrot),zview(zrot)
replot
iteration_count=iteration_count+1
if ((!limit_iterations) || (iteration_count<=limit_iterations)) reread

You can imagine how this works.  Just define all the variables and away we go.

Some comments:

1) It would be nice if looping could be done without requiring two files.  What might enable that is a special test or function saying how deep the "reread" is.  For example, say I wanted to have the above example in a single file, it might be

if (!load_depth())
  <all the initial definitions>
else
  zrot=
  xrot=
  set view
  replot
  iteration_count=
  if () reread
end

where load_depth() is just some pseudo function or variable that gnuplot makes available.

2) Modulo (%) doesn't seem to work with negative numbers.  Shouldn't it?

3) We've got to combine the layout and border behavior for 2D and 3D plots.  In the demo I created, I had to make the GIF output resolution very large simply because otherwise all the image is used up by the borders and only a few pixels are left for the plot.  I tried to kludge this by making the view scaling large, but then got:

gnuplot: hidden3d.c:776: store_polygon: Assertion `p->ymax <= surface_scale' failed.

Dan