Recent changes to polar coordinates in gnuplot 5.1
The development version of gnuplot (5.1) now contains a set of fixes,
improvements, and additions to the support for polar coordinates.
Please give them a test and report any problems.
- The r axis now has a full set of range, label, and tic properties
set rrange [min:max]
set log r
set rlabel "R-axis"
set grid [no]rtics [no]mrtics
- New commands
"set ttics" and "set mttics" control placement and labeling of tics
around the perimeter of a polar plot
"set border polar" draws a circular solid line at the perimeter
- Use of polar coordinates to position labels, arrows, objects
You can now use the keyword "polar" when specifying coordinates for
any position. For example to place a labeled arrow on a polar plot:
theta = 15; r = 1.23
set arrow 1 from polar 0,0 to polar theta, r
set label 1 at polar theta,r "Current place" offset 1,1
There is now a single utility routine polar_to_xy(theta, r, &x, &y)
to convert from polar coordinates to cartesian coordinates.
It is used for both data input and plot layout. If you add new
code that supports polar coordinates please use this routine.