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Honor set_rlabel_position on partial-wedge polar axes - #32539
mertkayacs wants to merge 3 commits into
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agammann
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The new manual-label branch in get_yaxis_text1_transform() chooses horizontal alignment from get_theta_direction(), but test_polar_rlabel_position_wedge only exercises the default counterclockwise direction and checks anchor positions. Could you also run it with set_theta_direction(-1) and assert the alignment or rendered label placement? That would cover the clockwise branch introduced here, including the new rlabel padding path.
Review prepared by Codex on behalf of agammann.
With set_theta_direction(-1) and an explicit rlabel position on a wedge, the rlabel pad shift pointed to the clockwise side of the radial line while RadialTick.update_position aligns the text on the counterclockwise side, so the labels straddled the gridline. Shift toward the side the text is on. Extend test_polar_rlabel_position_wedge to both theta directions and assert the anchor, the pad shift and that the whole label stays on the padded side of the radial line.
| full = _is_full_circle_deg(thetamin, thetamax) | ||
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| if full: | ||
| if full or axes._r_label_position_manual: |
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Slight logic concern: "full or manually set" seems a strange condition.
I feel there should be a cleaner way of expressing this. The point is that "full or manual" takes the _rlabel_position_transform whereas "non-manual wedge" must decide on a suitable angle based on thetamin. It's likely not possible to push that decision up so that we don't have if/else distinction here, because we evalutate on the current thetamin. So the reverse question: Could we only store the r_label angular value and create the transform here?
Keep only the rlabel angle, None until set_rlabel_position is called, in place of the Affine2D and the flag that recorded whether the position was set. PolarAxes._get_rlabel_theta decides in one place where the labels go: the set angle, else the default angle on a full circle and thetamin on a partial wedge. The lazily evaluated _RLabelTransform builds the label translation from it, and label1, tick1, the 'rlabel' pad and RadialTick.update_position all use it, so the "full or manual" special cases are gone from draw(), get_yaxis_text1_transform and update_position. With a set position on a wedge, this also fixes the padding when the position changes after a draw or when the ticks existed before it was set, keeps the end-edge labels and tick marks (label2, tick2) on their edge where they used to jump to the set angle plus one radian, and turns the start tick marks perpendicular to the label line as on the default edge. With inverted theta limits, the default labels now follow thetamin, which their alignment and padding already assumed. Add tests for setting the position over existing ticks and for a position at thetamin giving the default wedge layout.
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That works: the only rlabel state is now the angle ( |
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Thanks for checking the clockwise case. I rechecked head |
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PR summary
Closes #15835.
PolarAxes.drawreplaces the r-axis label transform with_yaxis_transformwhenever the axes shows a partial wedge, and that transform drops_r_label_positionentirely, soset_rlabel_positionsilently does nothing on wedge plots.The only rlabel state is now the angle,
Noneuntilset_rlabel_positionis called.PolarAxes._get_rlabel_thetadecides which radial line the labels use: the set angle, else the default angle on a full circle and thetamin on a wedge. A small lazy transform,_RLabelTransform, builds the label translation from it, and the label position, its tick mark, the pad shift (_ThetaShiftmode'rlabel') andRadialTick.update_positionall read that one value. A set position is honored even outside the wedge, as suggested in the issue. Without one, the labels still go along the wedge edges, so existing plots do not change, except wedges with inverted theta limits, whose labels now follow thetamin as their alignment already assumed. The labels on the other edge (label2On) stay on that edge.set_rgridsno longer callsset_rlabel_positionwhen noangleis passed, which would otherwise pin the labels on a wedge to the default angle.AI Disclosure
I used AI agents to help trace the transform chain and to draft the fix and the test. I reviewed, understood and ran all of it myself before opening this PR.
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