Skip to content

Display r and theta on hover for polar plots #26271

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 2 commits into
base: main
Choose a base branch
from
Open

Display r and theta on hover for polar plots #26271

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
56af056
possible solve for issue #4568
klorine28 Jul 6, 2023
e3cca9b
Update issue #4568.py
klorine28 Jul 7, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
33 changes: 33 additions & 0 deletions issue#4568.py
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,33 @@
def format_coord(self, theta, r):
# docstring inherited
screen_xy = self.transData.transform((theta, r))
screen_xys = screen_xy + np.stack(
np.meshgrid([-1, 0, 1], [-1, 0, 1])).reshape((2, -1)).T
ts, rs = self.transData.inverted().transform(screen_xys).T
delta_t = abs((ts - theta + np.pi) % (2 * np.pi) - np.pi).max()
delta_t_halfturns = delta_t / np.pi
delta_t_degrees = delta_t_halfturns * 180
delta_r = abs(rs - r).max()
if theta < 0:
theta += 2 * np.pi
theta_halfturns = theta / np.pi
theta_degrees = theta_halfturns * 180

# See ScalarFormatter.format_data_short. For r, use #g-formatting
# (as for linear axes), but for theta, use f-formatting as scientific
# notation doesn't make sense and the trailing dot is ugly.
def format_sig(value, delta, opt, fmt):
# For "f", only count digits after decimal point.
prec = (max(0, -math.floor(math.log10(delta))) if fmt == "f" else
cbook._g_sig_digits(value, delta))
return f"{value:-{opt}.{prec}{fmt}}"
#retrieves corresponding formatting information to properly plot on the polar plot.
fmt_theta = self.xaxis.get_major_formatter().format_data
fmt_r = self.yaxis.get_major_formatter().format_data

return ('\N{GREEK SMALL LETTER THETA}={}\N{GREEK SMALL LETTER PI} '
'({}\N{DEGREE SIGN}), r={}').format(
format_sig(fmt_theta(theta), delta_t_halfturns, "", "f"),
format_sig(theta_degrees, delta_t_degrees, "", "f"),
format_sig(fmt_r(r), delta_r, "#", "g"),
)