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Base anchor contents labels based on dpi-aware font bounding rect

readme_bumpz
Tyler Goodlet 2021-03-31 14:25:17 -04:00
parent 3f7d9c5c15
commit 54d36f26f0
1 changed files with 20 additions and 12 deletions
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32
piker/ui/_graphics/_cursor.py
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@ -18,6 +18,7 @@
Mouse interaction graphics
"""
import math
from typing import Optional, Tuple, Set, Dict
import inspect
@ -113,10 +114,6 @@ class LineDot(pg.CurvePoint):
return False
# TODO: likely will need to tweak this based on dpi...
_y_margin = 5
# TODO: change this into our own ``Label``
class ContentsLabel(pg.LabelItem):
"""Label anchored to a ``ViewBox`` typically for displaying
@ -132,11 +129,11 @@ class ContentsLabel(pg.LabelItem):
# XXX: fyi naming here is confusing / opposite to coords
_corner_margins = {
('top', 'left'): (-4, -_y_margin),
('top', 'right'): (4, -_y_margin),
('top', 'left'): (-2, lambda font_size: -font_size*0.25),
('top', 'right'): (2, lambda font_size: -font_size*0.25),
('bottom', 'left'): (-4, lambda font_size: font_size + 2*_y_margin),
('bottom', 'right'): (4, lambda font_size: font_size + 2*_y_margin),
('bottom', 'left'): (-2, lambda font_size: font_size),
('bottom', 'right'): (2, lambda font_size: font_size),
}
def __init__(
@ -147,11 +144,21 @@ class ContentsLabel(pg.LabelItem):
font_size: Optional[int] = None,
) -> None:
font_size = font_size or _font.font.pixelSize()
super().__init__(
justify=justify_text,
size=f'{str(font_size)}px'
)
if _font._physical_dpi >= 97:
# ad-hoc scale it based on boundingRect
# TODO: need proper fix for this?
typical_br = _font._qfm.boundingRect('Qyp')
anchor_font_size = math.ceil(typical_br.height() * 1.25)
else:
anchor_font_size = font_size
# anchor to viewbox
self.setParentItem(chart._vb)
chart.scene().addItem(self)
@ -163,7 +170,9 @@ class ContentsLabel(pg.LabelItem):
ydim = margins[1]
if inspect.isfunction(margins[1]):
margins = margins[0], ydim(font_size)
margins = margins[0], ydim(anchor_font_size)
print(f'margins: {margins}')
self.anchor(itemPos=index, parentPos=index, offset=margins)
@ -385,13 +394,12 @@ class Cursor(pg.GraphicsObject):
if self._y_label_update:
self.graphics[self.active_plot]['yl'].update_label(
abs_pos=plot.mapFromView(QPointF(ix, iy + line_offset)),
abs_pos=plot.mapFromView(QPointF(ix, iy)),
value=iy
)
# only update horizontal xhair line if label is enabled
self.graphics[plot]['hl'].setY(iy + line_offset)
self.graphics[plot]['hl'].setY(iy)
# update all trackers
for item in self._trackers: