Add `Axis.add_sticky()` for creating axis labels
We have this method on our `ChartPlotWidget` but it makes more sense to directly associate axis-labels with, well, the label's parent axis XD. We add `._stickies: dict[str, YAxisLabel]` to replace `ChartPlotWidget._ysticks` and pass in the `pg.PlotItem` to each axis instance, stored as `Axis.pi` instead of handing around linked split references (which are way out of scope for a single axis). More work needs to be done to remove dependence on `.chart: ChartPlotWidget` references in the date axis type as per comments.multichartz_backup
Tyler Goodlet
parent
e0f1520e0f
commit
a24acf48f8
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@ -18,6 +18,7 @@
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Chart axes graphics and behavior.
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"""
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from __future__ import annotations
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from functools import lru_cache
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from typing import Optional, Callable
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from math import floor
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@ -27,6 +28,7 @@ import pyqtgraph as pg
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from PyQt5 import QtCore, QtGui, QtWidgets
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from PyQt5.QtCore import QPointF
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from . import _pg_overrides as pgo
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from ..data._source import float_digits
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from ._label import Label
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from ._style import DpiAwareFont, hcolor, _font
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@ -46,7 +48,7 @@ class Axis(pg.AxisItem):
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'''
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def __init__(
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self,
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linkedsplits,
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plotitem: pgo.PlotItem,
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typical_max_str: str = '100 000.000',
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text_color: str = 'bracket',
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lru_cache_tick_strings: bool = True,
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@ -61,27 +63,32 @@ class Axis(pg.AxisItem):
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# XXX: pretty sure this makes things slower
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# self.setCacheMode(QtWidgets.QGraphicsItem.DeviceCoordinateCache)
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self.linkedsplits = linkedsplits
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self.pi = plotitem
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self._dpi_font = _font
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self.setTickFont(_font.font)
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font_size = self._dpi_font.font.pixelSize()
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style_conf = {
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'textFillLimits': [(0, 0.5)],
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'tickFont': self._dpi_font.font,
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}
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text_offset = None
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if self.orientation in ('bottom',):
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text_offset = floor(0.25 * font_size)
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elif self.orientation in ('left', 'right'):
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text_offset = floor(font_size / 2)
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self.setStyle(**{
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'textFillLimits': [(0, 0.5)],
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'tickFont': self._dpi_font.font,
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if text_offset:
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style_conf.update({
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# offset of text *away from* axis line in px
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# use approx. half the font pixel size (height)
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'tickTextOffset': text_offset,
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})
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self.setStyle(**style_conf)
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self.setTickFont(_font.font)
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# NOTE: this is for surrounding "border"
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@ -102,6 +109,9 @@ class Axis(pg.AxisItem):
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maxsize=2**20
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)(self.tickStrings)
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# axis "sticky" labels
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self._stickies: dict[str, YAxisLabel] = {}
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# NOTE: only overriden to cast tick values entries into tuples
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# for use with the lru caching.
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def tickValues(
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@ -139,6 +149,40 @@ class Axis(pg.AxisItem):
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def txt_offsets(self) -> tuple[int, int]:
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return tuple(self.style['tickTextOffset'])
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def add_sticky(
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self,
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pi: pgo.PlotItem,
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name: None | str = None,
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digits: None | int = 2,
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# axis_name: str = 'right',
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bg_color='bracket',
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) -> YAxisLabel:
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# if the sticky is for our symbol
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# use the tick size precision for display
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name = name or pi.name
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digits = digits or 2
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# TODO: ``._ysticks`` should really be an attr on each
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# ``PlotItem`` no instead of the (containing because of
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# overlays) widget?
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# add y-axis "last" value label
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sticky = self._stickies[name] = YAxisLabel(
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pi=pi,
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parent=self,
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# TODO: pass this from symbol data
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digits=digits,
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opacity=1,
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bg_color=bg_color,
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)
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pi.sigRangeChanged.connect(sticky.update_on_resize)
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# pi.addItem(sticky)
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# pi.addItem(last)
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return sticky
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class PriceAxis(Axis):
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@ -255,7 +299,9 @@ class DynamicDateAxis(Axis):
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) -> list[str]:
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chart = self.linkedsplits.chart
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# XX: ARGGGGG AG:LKSKDJF:LKJSDFD
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chart = self.pi.chart_widget
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flow = chart._flows[chart.name]
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shm = flow.shm
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bars = shm.array
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@ -533,16 +579,15 @@ class YAxisLabel(AxisLabel):
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def __init__(
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self,
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chart,
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pi: pgo.PlotItem,
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*args,
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**kwargs
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) -> None:
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super().__init__(*args, **kwargs)
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self._chart = chart
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chart.sigRangeChanged.connect(self.update_on_resize)
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self._pi = pi
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pi.sigRangeChanged.connect(self.update_on_resize)
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self._last_datum = (None, None)
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@ -612,7 +657,7 @@ class YAxisLabel(AxisLabel):
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self._last_datum = (index, value)
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self.update_label(
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self._chart.mapFromView(QPointF(index, value)),
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self._pi.mapFromView(QPointF(index, value)),
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value
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)
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