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Add a `Flow` compound type for coupling graphics with backing data-streams

windows_fixes_yo
Tyler Goodlet 2022-02-08 15:52:50 -05:00
parent 860ed99757
commit e3a3fd2d39
1 changed files with 28 additions and 10 deletions
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38
piker/ui/_chart.py
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@ -33,6 +33,7 @@ from PyQt5.QtWidgets import (
import numpy as np import numpy as np
import pyqtgraph as pg import pyqtgraph as pg
import trio import trio
from pydantic import BaseModel
from ._axes import ( from ._axes import (
DynamicDateAxis, DynamicDateAxis,
@ -614,17 +615,30 @@ class LinkedSplits(QWidget):
cpw.sidepane.setMinimumWidth(sp_w) cpw.sidepane.setMinimumWidth(sp_w)
cpw.sidepane.setMaximumWidth(sp_w) cpw.sidepane.setMaximumWidth(sp_w)
# import pydantic
# class Graphics(pydantic.BaseModel): # class FlowsTable(pydantic.BaseModel):
# ''' # '''
# Data-AGGRegate: high level API onto multiple (categorized) # Data-AGGRegate: high level API onto multiple (categorized)
# ``ShmArray``s with high level processing routines for # ``Flow``s with high level processing routines for
# graphics computations and display. # multi-graphics computations and display.
# ''' # '''
# arrays: dict[str, np.ndarray] = {} # flows: dict[str, np.ndarray] = {}
# graphics: dict[str, pg.GraphicsObject] = {}
class Flow(BaseModel):
'''
(FinancialSignal-)Flow compound type which wraps a real-time
graphics (curve) and its backing data stream together for high level
access and control.
'''
class Config:
arbitrary_types_allowed = True
name: str
plot: pg.PlotItem
shm: Optional[ShmArray] = None # may be filled in "later"
class ChartPlotWidget(pg.PlotWidget): class ChartPlotWidget(pg.PlotWidget):
@ -721,8 +735,9 @@ class ChartPlotWidget(pg.PlotWidget):
self.data_key: array, self.data_key: array,
} }
self._graphics = {} # registry of underlying graphics self._graphics = {} # registry of underlying graphics
# registry of overlay curve names # registry of overlay curve names
self._overlays: dict[str, ShmArray] = {} self._flows: dict[str, Flow] = {}
self._feeds: dict[Symbol, Feed] = {} self._feeds: dict[Symbol, Feed] = {}
@ -981,7 +996,7 @@ class ChartPlotWidget(pg.PlotWidget):
# TODO: this probably needs its own method? # TODO: this probably needs its own method?
if overlay: if overlay:
# anchor_at = ('bottom', 'left') # anchor_at = ('bottom', 'left')
self._overlays[name] = None self._flows[name] = Flow(name=name, plot=pi)
if isinstance(overlay, pg.PlotItem): if isinstance(overlay, pg.PlotItem):
if overlay not in self.pi_overlay.overlays: if overlay not in self.pi_overlay.overlays:
@ -1062,7 +1077,7 @@ class ChartPlotWidget(pg.PlotWidget):
assert len(array) assert len(array)
data_key = array_key or graphics_name data_key = array_key or graphics_name
if graphics_name not in self._overlays: if graphics_name not in self._flows:
self._arrays[self.name] = array self._arrays[self.name] = array
else: else:
self._arrays[data_key] = array self._arrays[data_key] = array
@ -1164,12 +1179,15 @@ class ChartPlotWidget(pg.PlotWidget):
# f"begin: {begin}, end: {end}, extra: {extra}" # f"begin: {begin}, end: {end}, extra: {extra}"
# ) # )
# TODO: here we should instead look up the ``Flow.shm.array``
# and read directly from shm to avoid copying to memory first
# and then reading it again here.
a = self._arrays.get(name or self.name) a = self._arrays.get(name or self.name)
if a is None: if a is None:
return None return None
ifirst = a[0]['index'] ifirst = a[0]['index']
bars = a[lbar - ifirst:rbar - ifirst + 1] bars = a[lbar - ifirst:(rbar - ifirst) + 1]
if not len(bars): if not len(bars):
# likely no data loaded yet or extreme scrolling? # likely no data loaded yet or extreme scrolling?