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# A generic rotation routine for the gnuplot view. In the commands
# that load this file, the following should be defined:
#
# iteration_count: set iteration_count=0
#
# limit_iterations: if set to a nonzero value, it'll stop after that
# many iterations; if zero value, continues indefinitely
#
# xrot: the initial x rotation of the view
#
# xrot_delta: the amount to increment the x rotation for each new plot
#
# xview: function for generating x view value; for example
# xview(xrot)=(50.+30.*sin((xrot%180)/180.*pi))
#
# zrot: the initial z rotation of the view
#
# zrot_delta: the amount to increment the z rotation for each new plot
#
# zview: function for generating z view value; for example
# zview(zrot)=(60.+45.*sin(zrot/180.*pi))
#
# History:
# - 1. 1. 2006 Dan Sebald: Made more generic so other demos could use
# - ?. ?. ? Hans-Bernhard Broeker: Used to just turn round and round
# by somewhat large steps. Now, it tumbles back and forth
# smoothly.
# - ?. ?. ? ?: Initial recursive script
iteration_count=iteration_count+1
if ((!limit_iterations) || (iteration_count<=limit_iterations)) \
set view xview(xrot),zview(zrot); \
replot; \
zrot=(zrot+zrot_delta)%360; \
xrot=(xrot+xrot_delta)%360; \
reread
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