Move `Viz` layer to new `.ui` mod
Tyler Goodlet
parent
95325b22f0
commit
89b6fde1ef
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@ -35,7 +35,7 @@ from ._pathops import (
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)
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if TYPE_CHECKING:
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from ._render import (
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from ._dataviz import (
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Viz,
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)
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from .._profile import Profiler
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@ -72,7 +72,7 @@ from ._interaction import ChartView
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from ._forms import FieldsForm
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from .._profile import pg_profile_enabled, ms_slower_then
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from ._overlay import PlotItemOverlay
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from ._render import Viz
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from ._dataviz import Viz
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from ._search import SearchWidget
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from . import _pg_overrides as pgo
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from .._profile import Profiler
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@ -0,0 +1,955 @@
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# piker: trading gear for hackers
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# Copyright (C) Tyler Goodlet (in stewardship for pikers)
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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'''
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Data vizualization APIs
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'''
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from __future__ import annotations
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from typing import (
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Optional,
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TYPE_CHECKING,
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)
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import msgspec
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import numpy as np
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import pyqtgraph as pg
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from PyQt5.QtCore import QLineF
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from ..data._sharedmem import (
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ShmArray,
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)
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from ..data.feed import Flume
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from ..data._formatters import (
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IncrementalFormatter,
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OHLCBarsFmtr, # Plain OHLC renderer
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OHLCBarsAsCurveFmtr, # OHLC converted to line
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StepCurveFmtr, # "step" curve (like for vlm)
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)
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from ..data._pathops import (
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slice_from_time,
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)
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from ._ohlc import (
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BarItems,
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)
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from ._curve import (
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Curve,
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StepCurve,
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FlattenedOHLC,
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)
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from ._render import Renderer
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from ..log import get_logger
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from .._profile import (
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Profiler,
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pg_profile_enabled,
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)
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if TYPE_CHECKING:
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from ._interaction import ChartView
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from ._chart import ChartPlotWidget
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log = get_logger(__name__)
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def render_baritems(
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viz: Viz,
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graphics: BarItems,
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read: tuple[
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int, int, np.ndarray,
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int, int, np.ndarray,
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],
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profiler: Profiler,
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**kwargs,
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) -> None:
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'''
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Graphics management logic for a ``BarItems`` object.
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Mostly just logic to determine when and how to downsample an OHLC
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lines curve into a flattened line graphic and when to display one
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graphic or the other.
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TODO: this should likely be moved into some kind of better abstraction
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layer, if not a `Renderer` then something just above it?
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'''
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bars = graphics
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self = viz # TODO: make this a ``Viz`` method?
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r = self._src_r
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first_render: bool = False
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# if no source data renderer exists create one.
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if not r:
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first_render = True
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# OHLC bars path renderer
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r = self._src_r = Renderer(
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viz=self,
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fmtr=OHLCBarsFmtr(
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shm=viz.shm,
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viz=viz,
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),
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)
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ds_curve_r = Renderer(
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viz=self,
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fmtr=OHLCBarsAsCurveFmtr(
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shm=viz.shm,
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viz=viz,
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),
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)
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curve = FlattenedOHLC(
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name=f'{viz.name}_ds_ohlc',
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color=bars._color,
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)
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viz.ds_graphics = curve
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curve.hide()
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self.plot.addItem(curve)
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# baseline "line" downsampled OHLC curve that should
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# kick on only when we reach a certain uppx threshold.
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self._render_table = (ds_curve_r, curve)
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ds_r, curve = self._render_table
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# print(
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# f'r: {r.fmtr.xy_slice}\n'
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# f'ds_r: {ds_r.fmtr.xy_slice}\n'
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# )
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# do checks for whether or not we require downsampling:
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# - if we're **not** downsampling then we simply want to
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# render the bars graphics curve and update..
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# - if instead we are in a downsamplig state then we to
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x_gt = 6 * (self.index_step() or 1)
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uppx = curve.x_uppx()
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# print(f'BARS UPPX: {uppx}')
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in_line = should_line = curve.isVisible()
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if (
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in_line
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and uppx < x_gt
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):
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# print('FLIPPING TO BARS')
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should_line = False
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viz._in_ds = False
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elif (
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not in_line
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and uppx >= x_gt
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):
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# print('FLIPPING TO LINE')
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should_line = True
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viz._in_ds = True
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profiler(f'ds logic complete line={should_line}')
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# do graphics updates
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if should_line:
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r = ds_r
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graphics = curve
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profiler('updated ds curve')
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else:
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graphics = bars
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if first_render:
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bars.show()
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changed_to_line = False
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if (
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not in_line
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and should_line
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):
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# change to line graphic
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log.info(
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f'downsampling to line graphic {self.name}'
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)
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bars.hide()
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curve.show()
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curve.update()
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changed_to_line = True
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elif (
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in_line
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and not should_line
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):
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# change to bars graphic
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log.info(
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f'showing bars graphic {self.name}\n'
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f'first bars render?: {first_render}'
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)
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curve.hide()
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bars.show()
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bars.update()
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# XXX: is this required?
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viz._in_ds = should_line
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should_redraw = (
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changed_to_line
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or not should_line
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)
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return (
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graphics,
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r,
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should_redraw,
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)
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class Viz(msgspec.Struct): # , frozen=True):
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'''
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(Data) "Visualization" compound type which wraps a real-time
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shm array stream with displayed graphics (curves, charts)
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for high level access and control as well as efficient incremental
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update.
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The intention is for this type to eventually be capable of shm-passing
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of incrementally updated graphics stream data between actors.
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'''
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name: str
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plot: pg.PlotItem
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_shm: ShmArray
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flume: Flume
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graphics: Curve | BarItems
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# for tracking y-mn/mx for y-axis auto-ranging
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yrange: tuple[float, float] = None
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# in some cases a viz may want to change its
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# graphical "type" or, "form" when downsampling, to
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# start this is only ever an interpolation line.
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ds_graphics: Optional[Curve] = None
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is_ohlc: bool = False
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render: bool = True # toggle for display loop
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# _index_field: str = 'index'
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_index_field: str = 'time'
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# downsampling state
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_last_uppx: float = 0
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_in_ds: bool = False
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_index_step: float | None = None
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# map from uppx -> (downsampled data, incremental graphics)
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_src_r: Optional[Renderer] = None
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_render_table: dict[
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Optional[int],
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tuple[Renderer, pg.GraphicsItem],
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] = (None, None)
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# cache of y-range values per x-range input.
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_mxmns: dict[tuple[int, int], tuple[float, float]] = {}
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@property
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def shm(self) -> ShmArray:
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return self._shm
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@property
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def index_field(self) -> str:
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return self._index_field
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def index_step(
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self,
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reset: bool = False,
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) -> float:
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if self._index_step is None:
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index = self.shm.array[self.index_field]
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self._index_step = index[-1] - index[-2]
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return self._index_step
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def maxmin(
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self,
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lbar: int,
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rbar: int,
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) -> Optional[tuple[float, float]]:
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'''
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Compute the cached max and min y-range values for a given
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x-range determined by ``lbar`` and ``rbar`` or ``None``
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if no range can be determined (yet).
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'''
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# TODO: hash the slice instead maybe?
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# https://stackoverflow.com/a/29980872
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rkey = (round(lbar), round(rbar))
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cached_result = self._mxmns.get(rkey)
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do_print = False
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if cached_result:
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if do_print:
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print(
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f'{self.name} CACHED maxmin\n'
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f'{rkey} -> {cached_result}'
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)
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return cached_result
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shm = self.shm
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if shm is None:
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return None
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arr = shm.array
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# get relative slice indexes into array
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if self.index_field == 'time':
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read_slc = slice_from_time(
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arr,
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start_t=lbar,
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stop_t=rbar,
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)
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slice_view = arr[read_slc]
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else:
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ifirst = arr[0]['index']
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slice_view = arr[
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lbar - ifirst:
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(rbar - ifirst) + 1
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]
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if not slice_view.size:
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log.warning(f'{self.name} no maxmin in view?')
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return None
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elif self.yrange:
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mxmn = self.yrange
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if do_print:
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print(
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f'{self.name} M4 maxmin:\n'
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f'{rkey} -> {mxmn}'
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)
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else:
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if self.is_ohlc:
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ylow = np.min(slice_view['low'])
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yhigh = np.max(slice_view['high'])
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else:
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view = slice_view[self.name]
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ylow = np.min(view)
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yhigh = np.max(view)
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mxmn = ylow, yhigh
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if (
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do_print
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# and self.index_step() > 1
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):
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s = 3
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print(
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f'{self.name} MANUAL ohlc={self.is_ohlc} maxmin:\n'
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f'{rkey} -> {mxmn}\n'
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f'read_slc: {read_slc}\n'
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f'abs_slc: {slice_view["index"]}\n'
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f'first {s}:\n{slice_view[:s]}\n'
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f'last {s}:\n{slice_view[-s:]}\n'
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)
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# cache result for input range
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assert mxmn
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self._mxmns[rkey] = mxmn
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return mxmn
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def view_range(self) -> tuple[int, int]:
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'''
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Return the start and stop x-indexes for the managed ``ViewBox``.
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'''
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vr = self.plot.viewRect()
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return (
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vr.left(),
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vr.right(),
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)
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def bars_range(self) -> tuple[int, int, int, int]:
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'''
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Return a range tuple for the left-view, left-datum, right-datum
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and right-view x-indices.
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'''
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l, start, datum_start, datum_stop, stop, r = self.datums_range()
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return l, datum_start, datum_stop, r
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def datums_range(
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self,
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view_range: None | tuple[float, float] = None,
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index_field: str | None = None,
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array: None | np.ndarray = None,
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) -> tuple[
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int, int, int, int, int, int
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]:
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'''
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Return a range tuple for the datums present in view.
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'''
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l, r = view_range or self.view_range()
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index_field: str = index_field or self.index_field
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if index_field == 'index':
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l, r = round(l), round(r)
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if array is None:
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array = self.shm.array
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index = array[index_field]
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first = round(index[0])
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last = round(index[-1])
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# first and last datums in view determined by
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# l / r view range.
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leftmost = round(l)
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rightmost = round(r)
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# invalid view state
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if (
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r < l
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or l < 0
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or r < 0
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or (l > last and r > last)
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):
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leftmost = first
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rightmost = last
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else:
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rightmost = max(
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min(last, rightmost),
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first,
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)
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leftmost = min(
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max(first, leftmost),
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last,
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rightmost - 1,
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)
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assert leftmost < rightmost
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return (
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l, # left x-in-view
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first, # first datum
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leftmost,
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rightmost,
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last, # last_datum
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r, # right-x-in-view
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)
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def read(
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self,
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array_field: Optional[str] = None,
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index_field: str | None = None,
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profiler: None | Profiler = None,
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) -> tuple[
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int, int, np.ndarray,
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int, int, np.ndarray,
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]:
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'''
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Read the underlying shm array buffer and
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return the data plus indexes for the first
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and last
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which has been written to.
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'''
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index_field: str = index_field or self.index_field
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vr = l, r = self.view_range()
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# readable data
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array = self.shm.array
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if profiler:
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profiler('self.shm.array READ')
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(
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l,
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ifirst,
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lbar,
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rbar,
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ilast,
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r,
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) = self.datums_range(
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view_range=vr,
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index_field=index_field,
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array=array,
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)
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if profiler:
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profiler('self.datums_range()')
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abs_slc = slice(ifirst, ilast)
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# TODO: support time slicing
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if index_field == 'time':
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read_slc = slice_from_time(
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array,
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start_t=lbar,
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stop_t=rbar,
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)
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# TODO: maybe we should return this from the slicer call
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# above?
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in_view = array[read_slc]
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if in_view.size:
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abs_indx = in_view['index']
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abs_slc = slice(
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int(abs_indx[0]),
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int(abs_indx[-1]),
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)
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if profiler:
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profiler(
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'`slice_from_time('
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f'start_t={lbar}'
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f'stop_t={rbar})'
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)
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# array-index slicing
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# TODO: can we do time based indexing using arithmetic presuming
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# a uniform time stamp step size?
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else:
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# get read-relative indices adjusting for master shm index.
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lbar_i = max(l, ifirst) - ifirst
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rbar_i = min(r, ilast) - ifirst
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# NOTE: the slice here does NOT include the extra ``+ 1``
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# BUT the ``in_view`` slice DOES..
|
||||
read_slc = slice(lbar_i, rbar_i)
|
||||
in_view = array[lbar_i: rbar_i + 1]
|
||||
|
||||
# XXX: same as ^
|
||||
# to_draw = array[lbar - ifirst:(rbar - ifirst) + 1]
|
||||
if profiler:
|
||||
profiler('index arithmetic for slicing')
|
||||
|
||||
if array_field:
|
||||
array = array[array_field]
|
||||
|
||||
return (
|
||||
# abs indices + full data set
|
||||
abs_slc.start,
|
||||
abs_slc.stop,
|
||||
array,
|
||||
|
||||
# relative (read) indices + in view data
|
||||
read_slc.start,
|
||||
read_slc.stop,
|
||||
in_view,
|
||||
)
|
||||
|
||||
def update_graphics(
|
||||
self,
|
||||
use_vr: bool = True,
|
||||
render: bool = True,
|
||||
array_key: str | None = None,
|
||||
|
||||
profiler: Profiler | None = None,
|
||||
do_append: bool = True,
|
||||
|
||||
**kwargs,
|
||||
|
||||
) -> pg.GraphicsObject:
|
||||
'''
|
||||
Read latest datums from shm and render to (incrementally)
|
||||
render to graphics.
|
||||
|
||||
'''
|
||||
profiler = Profiler(
|
||||
msg=f'Viz.update_graphics() for {self.name}',
|
||||
disabled=not pg_profile_enabled(),
|
||||
ms_threshold=4,
|
||||
# ms_threshold=ms_slower_then,
|
||||
)
|
||||
# shm read and slice to view
|
||||
read = (
|
||||
xfirst, xlast, src_array,
|
||||
ivl, ivr, in_view,
|
||||
) = self.read(profiler=profiler)
|
||||
|
||||
profiler('read src shm data')
|
||||
|
||||
graphics = self.graphics
|
||||
|
||||
if (
|
||||
not in_view.size
|
||||
or not render
|
||||
):
|
||||
# print('exiting early')
|
||||
return graphics
|
||||
|
||||
should_redraw: bool = False
|
||||
|
||||
# TODO: probably specialize ``Renderer`` types instead of
|
||||
# these logic checks?
|
||||
# - put these blocks into a `.load_renderer()` meth?
|
||||
# - consider a OHLCRenderer, StepCurveRenderer, Renderer?
|
||||
r = self._src_r
|
||||
if isinstance(graphics, BarItems):
|
||||
# XXX: special case where we change out graphics
|
||||
# to a line after a certain uppx threshold.
|
||||
(
|
||||
graphics,
|
||||
r,
|
||||
should_redraw,
|
||||
) = render_baritems(
|
||||
self,
|
||||
graphics,
|
||||
read,
|
||||
profiler,
|
||||
**kwargs,
|
||||
)
|
||||
|
||||
elif not r:
|
||||
if isinstance(graphics, StepCurve):
|
||||
|
||||
r = self._src_r = Renderer(
|
||||
viz=self,
|
||||
fmtr=StepCurveFmtr(
|
||||
shm=self.shm,
|
||||
viz=self,
|
||||
),
|
||||
)
|
||||
|
||||
else:
|
||||
r = self._src_r
|
||||
if not r:
|
||||
# just using for ``.diff()`` atm..
|
||||
r = self._src_r = Renderer(
|
||||
viz=self,
|
||||
fmtr=IncrementalFormatter(
|
||||
shm=self.shm,
|
||||
viz=self,
|
||||
),
|
||||
)
|
||||
|
||||
# ``Curve`` derivative case(s):
|
||||
array_key = array_key or self.name
|
||||
# print(array_key)
|
||||
|
||||
# ds update config
|
||||
new_sample_rate: bool = False
|
||||
should_ds: bool = r._in_ds
|
||||
showing_src_data: bool = not r._in_ds
|
||||
|
||||
# downsampling incremental state checking
|
||||
# check for and set std m4 downsample conditions
|
||||
uppx = graphics.x_uppx()
|
||||
uppx_diff = (uppx - self._last_uppx)
|
||||
profiler(f'diffed uppx {uppx}')
|
||||
if (
|
||||
uppx > 1
|
||||
and abs(uppx_diff) >= 1
|
||||
):
|
||||
log.debug(
|
||||
f'{array_key} sampler change: {self._last_uppx} -> {uppx}'
|
||||
)
|
||||
self._last_uppx = uppx
|
||||
|
||||
new_sample_rate = True
|
||||
showing_src_data = False
|
||||
should_ds = True
|
||||
should_redraw = True
|
||||
|
||||
elif (
|
||||
uppx <= 2
|
||||
and self._in_ds
|
||||
):
|
||||
# we should de-downsample back to our original
|
||||
# source data so we clear our path data in prep
|
||||
# to generate a new one from original source data.
|
||||
new_sample_rate = True
|
||||
should_ds = False
|
||||
should_redraw = True
|
||||
showing_src_data = True
|
||||
|
||||
# MAIN RENDER LOGIC:
|
||||
# - determine in view data and redraw on range change
|
||||
# - determine downsampling ops if needed
|
||||
# - (incrementally) update ``QPainterPath``
|
||||
|
||||
out = r.render(
|
||||
read,
|
||||
array_key,
|
||||
profiler,
|
||||
uppx=uppx,
|
||||
# use_vr=True,
|
||||
|
||||
# TODO: better way to detect and pass this?
|
||||
# if we want to eventually cache renderers for a given uppx
|
||||
# we should probably use this as a key + state?
|
||||
should_redraw=should_redraw,
|
||||
new_sample_rate=new_sample_rate,
|
||||
should_ds=should_ds,
|
||||
showing_src_data=showing_src_data,
|
||||
|
||||
do_append=do_append,
|
||||
)
|
||||
|
||||
if not out:
|
||||
log.warning(f'{self.name} failed to render!?')
|
||||
return graphics
|
||||
|
||||
path, reset = out
|
||||
|
||||
# XXX: SUPER UGGGHHH... without this we get stale cache
|
||||
# graphics that don't update until you downsampler again..
|
||||
if reset:
|
||||
with graphics.reset_cache():
|
||||
# assign output paths to graphicis obj
|
||||
graphics.path = r.path
|
||||
graphics.fast_path = r.fast_path
|
||||
|
||||
# XXX: we don't need this right?
|
||||
# graphics.draw_last_datum(
|
||||
# path,
|
||||
# src_array,
|
||||
# reset,
|
||||
# array_key,
|
||||
# index_field=self.index_field,
|
||||
# )
|
||||
# graphics.update()
|
||||
# profiler('.update()')
|
||||
else:
|
||||
# assign output paths to graphicis obj
|
||||
graphics.path = r.path
|
||||
graphics.fast_path = r.fast_path
|
||||
|
||||
graphics.draw_last_datum(
|
||||
path,
|
||||
src_array,
|
||||
reset,
|
||||
array_key,
|
||||
index_field=self.index_field,
|
||||
)
|
||||
graphics.update()
|
||||
profiler('.update()')
|
||||
|
||||
# TODO: does this actuallly help us in any way (prolly should
|
||||
# look at the source / ask ogi). I think it avoid artifacts on
|
||||
# wheel-scroll downsampling curve updates?
|
||||
# TODO: is this ever better?
|
||||
# graphics.prepareGeometryChange()
|
||||
# profiler('.prepareGeometryChange()')
|
||||
|
||||
# track downsampled state
|
||||
self._in_ds = r._in_ds
|
||||
|
||||
return graphics
|
||||
|
||||
def draw_last(
|
||||
self,
|
||||
array_key: Optional[str] = None,
|
||||
only_last_uppx: bool = False,
|
||||
|
||||
) -> None:
|
||||
|
||||
# shm read and slice to view
|
||||
(
|
||||
xfirst, xlast, src_array,
|
||||
ivl, ivr, in_view,
|
||||
) = self.read()
|
||||
|
||||
g = self.graphics
|
||||
array_key = array_key or self.name
|
||||
x, y = g.draw_last_datum(
|
||||
g.path,
|
||||
src_array,
|
||||
False, # never reset path
|
||||
array_key,
|
||||
self.index_field,
|
||||
)
|
||||
|
||||
# the renderer is downsampling we choose
|
||||
# to always try and update a single (interpolating)
|
||||
# line segment that spans and tries to display
|
||||
# the last uppx's worth of datums.
|
||||
# we only care about the last pixel's
|
||||
# worth of data since that's all the screen
|
||||
# can represent on the last column where
|
||||
# the most recent datum is being drawn.
|
||||
if (
|
||||
self._in_ds
|
||||
or only_last_uppx
|
||||
):
|
||||
dsg = self.ds_graphics or self.graphics
|
||||
|
||||
# XXX: pretty sure we don't need this?
|
||||
# if isinstance(g, Curve):
|
||||
# with dsg.reset_cache():
|
||||
uppx = self._last_uppx
|
||||
y = y[-uppx:]
|
||||
ymn, ymx = y.min(), y.max()
|
||||
# print(f'drawing uppx={uppx} mxmn line: {ymn}, {ymx}')
|
||||
try:
|
||||
iuppx = x[-uppx]
|
||||
except IndexError:
|
||||
# we're less then an x-px wide so just grab the start
|
||||
# datum index.
|
||||
iuppx = x[0]
|
||||
|
||||
dsg._last_line = QLineF(
|
||||
iuppx, ymn,
|
||||
x[-1], ymx,
|
||||
)
|
||||
# print(f'updating DS curve {self.name}')
|
||||
dsg.update()
|
||||
|
||||
else:
|
||||
# print(f'updating NOT DS curve {self.name}')
|
||||
g.update()
|
||||
|
||||
def curve_width_pxs(self) -> float:
|
||||
'''
|
||||
Return the width of the current datums in view in pixel units.
|
||||
|
||||
'''
|
||||
_, lbar, rbar, _ = self.bars_range()
|
||||
return self.view.mapViewToDevice(
|
||||
QLineF(
|
||||
lbar, 0,
|
||||
rbar, 0
|
||||
)
|
||||
).length()
|
||||
|
||||
def default_view(
|
||||
self,
|
||||
bars_from_y: int = int(616 * 3/8),
|
||||
y_offset: int = 0,
|
||||
do_ds: bool = True,
|
||||
|
||||
) -> None:
|
||||
'''
|
||||
Set the plot's viewbox to a "default" startup setting where
|
||||
we try to show the underlying data range sanely.
|
||||
|
||||
'''
|
||||
shm: ShmArray = self.shm
|
||||
array: np.ndarray = shm.array
|
||||
view: ChartView = self.plot.vb
|
||||
(
|
||||
vl,
|
||||
first_datum,
|
||||
datum_start,
|
||||
datum_stop,
|
||||
last_datum,
|
||||
vr,
|
||||
) = self.datums_range(array=array)
|
||||
|
||||
# invalid case: view is not ordered correctly
|
||||
# return and expect caller to sort it out.
|
||||
if (
|
||||
vl > vr
|
||||
):
|
||||
log.warning(
|
||||
'Skipping `.default_view()` viewbox not initialized..\n'
|
||||
f'l -> r: {vl} -> {vr}\n'
|
||||
f'datum_start -> datum_stop: {datum_start} -> {datum_stop}\n'
|
||||
)
|
||||
return
|
||||
|
||||
chartw: ChartPlotWidget = self.plot.getViewWidget()
|
||||
index_field = self.index_field
|
||||
step = self.index_step()
|
||||
|
||||
if index_field == 'time':
|
||||
# transform l -> r view range values into
|
||||
# data index domain to determine how view
|
||||
# should be reset to better match data.
|
||||
read_slc = slice_from_time(
|
||||
array,
|
||||
start_t=vl,
|
||||
stop_t=vr,
|
||||
step=step,
|
||||
)
|
||||
else:
|
||||
read_slc = slice(0, datum_stop - datum_start + 1)
|
||||
|
||||
index_iv = array[index_field][read_slc]
|
||||
uppx: float = self.graphics.x_uppx() or 1
|
||||
|
||||
# l->r distance in scene units, no larger then data span
|
||||
data_diff = last_datum - first_datum
|
||||
rl_diff = min(vr - vl, data_diff)
|
||||
|
||||
# orient by offset from the y-axis including
|
||||
# space to compensate for the L1 labels.
|
||||
if not y_offset:
|
||||
|
||||
# we get the L1 spread label "length" in view coords and
|
||||
# make sure it doesn't colide with the right-most datum in
|
||||
# view.
|
||||
_, l1_len = chartw.pre_l1_xs()
|
||||
offset = l1_len/(uppx*step)
|
||||
|
||||
# if no L1 label is present just offset by a few datums
|
||||
# from the y-axis.
|
||||
if chartw._max_l1_line_len == 0:
|
||||
offset += 3*step
|
||||
else:
|
||||
offset = (y_offset * step) + uppx*step
|
||||
|
||||
# align right side of view to the rightmost datum + the selected
|
||||
# offset from above.
|
||||
r_reset = last_datum + offset
|
||||
|
||||
# no data is in view so check for the only 2 sane cases:
|
||||
# - entire view is LEFT of data
|
||||
# - entire view is RIGHT of data
|
||||
if index_iv.size == 0:
|
||||
log.warning(f'No data in view for {vl} -> {vr}')
|
||||
|
||||
# 2 cases either the view is to the left or right of the
|
||||
# data set.
|
||||
if (
|
||||
vl <= first_datum
|
||||
and vr <= first_datum
|
||||
):
|
||||
l_reset = first_datum
|
||||
|
||||
elif (
|
||||
vl >= last_datum
|
||||
and vr >= last_datum
|
||||
):
|
||||
l_reset = r_reset - rl_diff
|
||||
|
||||
else:
|
||||
raise RuntimeError(f'Unknown view state {vl} -> {vr}')
|
||||
|
||||
else:
|
||||
# maintain the l->r view distance
|
||||
l_reset = r_reset - rl_diff
|
||||
|
||||
# remove any custom user yrange setttings
|
||||
if chartw._static_yrange == 'axis':
|
||||
chartw._static_yrange = None
|
||||
|
||||
view.setXRange(
|
||||
min=l_reset,
|
||||
max=r_reset,
|
||||
padding=0,
|
||||
)
|
||||
|
||||
if do_ds:
|
||||
view.maybe_downsample_graphics()
|
||||
view._set_yrange()
|
||||
|
||||
# caller should do this!
|
||||
# self.linked.graphics_cycle()
|
||||
|
|
@ -18,8 +18,8 @@
|
|||
High level streaming graphics primitives.
|
||||
|
||||
This is an intermediate layer which associates real-time low latency
|
||||
graphics primitives with underlying FSP related data structures for fast
|
||||
incremental update.
|
||||
graphics primitives with underlying stream/flow related data structures
|
||||
for fast incremental update.
|
||||
|
||||
'''
|
||||
from __future__ import annotations
|
||||
|
|
@ -32,934 +32,25 @@ import msgspec
|
|||
import numpy as np
|
||||
import pyqtgraph as pg
|
||||
from PyQt5.QtGui import QPainterPath
|
||||
from PyQt5.QtCore import QLineF
|
||||
|
||||
from ..data._sharedmem import (
|
||||
ShmArray,
|
||||
)
|
||||
from ..data.feed import Flume
|
||||
from ..data._formatters import (
|
||||
IncrementalFormatter,
|
||||
OHLCBarsFmtr, # Plain OHLC renderer
|
||||
OHLCBarsAsCurveFmtr, # OHLC converted to line
|
||||
StepCurveFmtr, # "step" curve (like for vlm)
|
||||
)
|
||||
from ..data._pathops import (
|
||||
xy_downsample,
|
||||
slice_from_time,
|
||||
)
|
||||
from ._ohlc import (
|
||||
BarItems,
|
||||
)
|
||||
from ._curve import (
|
||||
Curve,
|
||||
StepCurve,
|
||||
FlattenedOHLC,
|
||||
)
|
||||
from ..log import get_logger
|
||||
from .._profile import (
|
||||
Profiler,
|
||||
pg_profile_enabled,
|
||||
)
|
||||
|
||||
|
||||
if TYPE_CHECKING:
|
||||
from ._interaction import ChartView
|
||||
from ._chart import ChartPlotWidget
|
||||
from ._dataviz import Viz
|
||||
|
||||
|
||||
log = get_logger(__name__)
|
||||
|
||||
|
||||
def render_baritems(
|
||||
viz: Viz,
|
||||
graphics: BarItems,
|
||||
read: tuple[
|
||||
int, int, np.ndarray,
|
||||
int, int, np.ndarray,
|
||||
],
|
||||
profiler: Profiler,
|
||||
**kwargs,
|
||||
|
||||
) -> None:
|
||||
'''
|
||||
Graphics management logic for a ``BarItems`` object.
|
||||
|
||||
Mostly just logic to determine when and how to downsample an OHLC
|
||||
lines curve into a flattened line graphic and when to display one
|
||||
graphic or the other.
|
||||
|
||||
TODO: this should likely be moved into some kind of better abstraction
|
||||
layer, if not a `Renderer` then something just above it?
|
||||
|
||||
'''
|
||||
bars = graphics
|
||||
|
||||
self = viz # TODO: make this a ``Viz`` method?
|
||||
r = self._src_r
|
||||
first_render: bool = False
|
||||
|
||||
# if no source data renderer exists create one.
|
||||
if not r:
|
||||
first_render = True
|
||||
|
||||
# OHLC bars path renderer
|
||||
r = self._src_r = Renderer(
|
||||
viz=self,
|
||||
fmtr=OHLCBarsFmtr(
|
||||
shm=viz.shm,
|
||||
viz=viz,
|
||||
),
|
||||
)
|
||||
|
||||
ds_curve_r = Renderer(
|
||||
viz=self,
|
||||
fmtr=OHLCBarsAsCurveFmtr(
|
||||
shm=viz.shm,
|
||||
viz=viz,
|
||||
),
|
||||
)
|
||||
|
||||
curve = FlattenedOHLC(
|
||||
name=f'{viz.name}_ds_ohlc',
|
||||
color=bars._color,
|
||||
)
|
||||
viz.ds_graphics = curve
|
||||
curve.hide()
|
||||
self.plot.addItem(curve)
|
||||
|
||||
# baseline "line" downsampled OHLC curve that should
|
||||
# kick on only when we reach a certain uppx threshold.
|
||||
self._render_table = (ds_curve_r, curve)
|
||||
|
||||
ds_r, curve = self._render_table
|
||||
|
||||
# print(
|
||||
# f'r: {r.fmtr.xy_slice}\n'
|
||||
# f'ds_r: {ds_r.fmtr.xy_slice}\n'
|
||||
# )
|
||||
|
||||
# do checks for whether or not we require downsampling:
|
||||
# - if we're **not** downsampling then we simply want to
|
||||
# render the bars graphics curve and update..
|
||||
# - if instead we are in a downsamplig state then we to
|
||||
x_gt = 6 * (self.index_step() or 1)
|
||||
uppx = curve.x_uppx()
|
||||
# print(f'BARS UPPX: {uppx}')
|
||||
in_line = should_line = curve.isVisible()
|
||||
|
||||
if (
|
||||
in_line
|
||||
and uppx < x_gt
|
||||
):
|
||||
# print('FLIPPING TO BARS')
|
||||
should_line = False
|
||||
viz._in_ds = False
|
||||
|
||||
elif (
|
||||
not in_line
|
||||
and uppx >= x_gt
|
||||
):
|
||||
# print('FLIPPING TO LINE')
|
||||
should_line = True
|
||||
viz._in_ds = True
|
||||
|
||||
profiler(f'ds logic complete line={should_line}')
|
||||
|
||||
# do graphics updates
|
||||
if should_line:
|
||||
r = ds_r
|
||||
graphics = curve
|
||||
profiler('updated ds curve')
|
||||
|
||||
else:
|
||||
graphics = bars
|
||||
|
||||
if first_render:
|
||||
bars.show()
|
||||
|
||||
changed_to_line = False
|
||||
if (
|
||||
not in_line
|
||||
and should_line
|
||||
):
|
||||
# change to line graphic
|
||||
log.info(
|
||||
f'downsampling to line graphic {self.name}'
|
||||
)
|
||||
bars.hide()
|
||||
curve.show()
|
||||
curve.update()
|
||||
changed_to_line = True
|
||||
|
||||
elif (
|
||||
in_line
|
||||
and not should_line
|
||||
):
|
||||
# change to bars graphic
|
||||
log.info(
|
||||
f'showing bars graphic {self.name}\n'
|
||||
f'first bars render?: {first_render}'
|
||||
)
|
||||
curve.hide()
|
||||
bars.show()
|
||||
bars.update()
|
||||
|
||||
# XXX: is this required?
|
||||
viz._in_ds = should_line
|
||||
|
||||
should_redraw = (
|
||||
changed_to_line
|
||||
or not should_line
|
||||
)
|
||||
return (
|
||||
graphics,
|
||||
r,
|
||||
should_redraw,
|
||||
)
|
||||
|
||||
|
||||
class Viz(msgspec.Struct): # , frozen=True):
|
||||
'''
|
||||
(Data) "Visualization" compound type which wraps a real-time
|
||||
shm array stream with displayed graphics (curves, charts)
|
||||
for high level access and control as well as efficient incremental
|
||||
update.
|
||||
|
||||
The intention is for this type to eventually be capable of shm-passing
|
||||
of incrementally updated graphics stream data between actors.
|
||||
|
||||
'''
|
||||
name: str
|
||||
plot: pg.PlotItem
|
||||
_shm: ShmArray
|
||||
flume: Flume
|
||||
graphics: Curve | BarItems
|
||||
|
||||
# for tracking y-mn/mx for y-axis auto-ranging
|
||||
yrange: tuple[float, float] = None
|
||||
|
||||
# in some cases a viz may want to change its
|
||||
# graphical "type" or, "form" when downsampling, to
|
||||
# start this is only ever an interpolation line.
|
||||
ds_graphics: Optional[Curve] = None
|
||||
|
||||
is_ohlc: bool = False
|
||||
render: bool = True # toggle for display loop
|
||||
|
||||
# _index_field: str = 'index'
|
||||
_index_field: str = 'time'
|
||||
|
||||
# downsampling state
|
||||
_last_uppx: float = 0
|
||||
_in_ds: bool = False
|
||||
_index_step: float | None = None
|
||||
|
||||
# map from uppx -> (downsampled data, incremental graphics)
|
||||
_src_r: Optional[Renderer] = None
|
||||
_render_table: dict[
|
||||
Optional[int],
|
||||
tuple[Renderer, pg.GraphicsItem],
|
||||
] = (None, None)
|
||||
|
||||
# cache of y-range values per x-range input.
|
||||
_mxmns: dict[tuple[int, int], tuple[float, float]] = {}
|
||||
|
||||
@property
|
||||
def shm(self) -> ShmArray:
|
||||
return self._shm
|
||||
|
||||
@property
|
||||
def index_field(self) -> str:
|
||||
return self._index_field
|
||||
|
||||
def index_step(
|
||||
self,
|
||||
reset: bool = False,
|
||||
|
||||
) -> float:
|
||||
if self._index_step is None:
|
||||
index = self.shm.array[self.index_field]
|
||||
self._index_step = index[-1] - index[-2]
|
||||
|
||||
return self._index_step
|
||||
|
||||
def maxmin(
|
||||
self,
|
||||
lbar: int,
|
||||
rbar: int,
|
||||
|
||||
) -> Optional[tuple[float, float]]:
|
||||
'''
|
||||
Compute the cached max and min y-range values for a given
|
||||
x-range determined by ``lbar`` and ``rbar`` or ``None``
|
||||
if no range can be determined (yet).
|
||||
|
||||
'''
|
||||
# TODO: hash the slice instead maybe?
|
||||
# https://stackoverflow.com/a/29980872
|
||||
rkey = (round(lbar), round(rbar))
|
||||
cached_result = self._mxmns.get(rkey)
|
||||
do_print = False
|
||||
if cached_result:
|
||||
|
||||
if do_print:
|
||||
print(
|
||||
f'{self.name} CACHED maxmin\n'
|
||||
f'{rkey} -> {cached_result}'
|
||||
)
|
||||
return cached_result
|
||||
|
||||
shm = self.shm
|
||||
if shm is None:
|
||||
return None
|
||||
|
||||
arr = shm.array
|
||||
|
||||
# get relative slice indexes into array
|
||||
if self.index_field == 'time':
|
||||
read_slc = slice_from_time(
|
||||
arr,
|
||||
start_t=lbar,
|
||||
stop_t=rbar,
|
||||
)
|
||||
slice_view = arr[read_slc]
|
||||
|
||||
else:
|
||||
ifirst = arr[0]['index']
|
||||
slice_view = arr[
|
||||
lbar - ifirst:
|
||||
(rbar - ifirst) + 1
|
||||
]
|
||||
|
||||
if not slice_view.size:
|
||||
log.warning(f'{self.name} no maxmin in view?')
|
||||
return None
|
||||
|
||||
elif self.yrange:
|
||||
mxmn = self.yrange
|
||||
if do_print:
|
||||
print(
|
||||
f'{self.name} M4 maxmin:\n'
|
||||
f'{rkey} -> {mxmn}'
|
||||
)
|
||||
|
||||
else:
|
||||
if self.is_ohlc:
|
||||
ylow = np.min(slice_view['low'])
|
||||
yhigh = np.max(slice_view['high'])
|
||||
|
||||
else:
|
||||
view = slice_view[self.name]
|
||||
ylow = np.min(view)
|
||||
yhigh = np.max(view)
|
||||
|
||||
mxmn = ylow, yhigh
|
||||
if (
|
||||
do_print
|
||||
# and self.index_step() > 1
|
||||
):
|
||||
s = 3
|
||||
print(
|
||||
f'{self.name} MANUAL ohlc={self.is_ohlc} maxmin:\n'
|
||||
f'{rkey} -> {mxmn}\n'
|
||||
f'read_slc: {read_slc}\n'
|
||||
f'abs_slc: {slice_view["index"]}\n'
|
||||
f'first {s}:\n{slice_view[:s]}\n'
|
||||
f'last {s}:\n{slice_view[-s:]}\n'
|
||||
)
|
||||
|
||||
# cache result for input range
|
||||
assert mxmn
|
||||
self._mxmns[rkey] = mxmn
|
||||
|
||||
return mxmn
|
||||
|
||||
def view_range(self) -> tuple[int, int]:
|
||||
'''
|
||||
Return the start and stop x-indexes for the managed ``ViewBox``.
|
||||
|
||||
'''
|
||||
vr = self.plot.viewRect()
|
||||
return (
|
||||
vr.left(),
|
||||
vr.right(),
|
||||
)
|
||||
|
||||
def bars_range(self) -> tuple[int, int, int, int]:
|
||||
'''
|
||||
Return a range tuple for the left-view, left-datum, right-datum
|
||||
and right-view x-indices.
|
||||
|
||||
'''
|
||||
l, start, datum_start, datum_stop, stop, r = self.datums_range()
|
||||
return l, datum_start, datum_stop, r
|
||||
|
||||
def datums_range(
|
||||
self,
|
||||
view_range: None | tuple[float, float] = None,
|
||||
index_field: str | None = None,
|
||||
array: None | np.ndarray = None,
|
||||
|
||||
) -> tuple[
|
||||
int, int, int, int, int, int
|
||||
]:
|
||||
'''
|
||||
Return a range tuple for the datums present in view.
|
||||
|
||||
'''
|
||||
l, r = view_range or self.view_range()
|
||||
|
||||
index_field: str = index_field or self.index_field
|
||||
if index_field == 'index':
|
||||
l, r = round(l), round(r)
|
||||
|
||||
if array is None:
|
||||
array = self.shm.array
|
||||
|
||||
index = array[index_field]
|
||||
first = round(index[0])
|
||||
last = round(index[-1])
|
||||
|
||||
# first and last datums in view determined by
|
||||
# l / r view range.
|
||||
leftmost = round(l)
|
||||
rightmost = round(r)
|
||||
|
||||
# invalid view state
|
||||
if (
|
||||
r < l
|
||||
or l < 0
|
||||
or r < 0
|
||||
or (l > last and r > last)
|
||||
):
|
||||
leftmost = first
|
||||
rightmost = last
|
||||
else:
|
||||
rightmost = max(
|
||||
min(last, rightmost),
|
||||
first,
|
||||
)
|
||||
|
||||
leftmost = min(
|
||||
max(first, leftmost),
|
||||
last,
|
||||
rightmost - 1,
|
||||
)
|
||||
|
||||
assert leftmost < rightmost
|
||||
|
||||
return (
|
||||
l, # left x-in-view
|
||||
first, # first datum
|
||||
leftmost,
|
||||
rightmost,
|
||||
last, # last_datum
|
||||
r, # right-x-in-view
|
||||
)
|
||||
|
||||
def read(
|
||||
self,
|
||||
array_field: Optional[str] = None,
|
||||
index_field: str | None = None,
|
||||
profiler: None | Profiler = None,
|
||||
|
||||
) -> tuple[
|
||||
int, int, np.ndarray,
|
||||
int, int, np.ndarray,
|
||||
]:
|
||||
'''
|
||||
Read the underlying shm array buffer and
|
||||
return the data plus indexes for the first
|
||||
and last
|
||||
which has been written to.
|
||||
|
||||
'''
|
||||
index_field: str = index_field or self.index_field
|
||||
vr = l, r = self.view_range()
|
||||
|
||||
# readable data
|
||||
array = self.shm.array
|
||||
|
||||
if profiler:
|
||||
profiler('self.shm.array READ')
|
||||
|
||||
(
|
||||
l,
|
||||
ifirst,
|
||||
lbar,
|
||||
rbar,
|
||||
ilast,
|
||||
r,
|
||||
) = self.datums_range(
|
||||
view_range=vr,
|
||||
index_field=index_field,
|
||||
array=array,
|
||||
)
|
||||
|
||||
if profiler:
|
||||
profiler('self.datums_range()')
|
||||
|
||||
abs_slc = slice(ifirst, ilast)
|
||||
|
||||
# TODO: support time slicing
|
||||
if index_field == 'time':
|
||||
read_slc = slice_from_time(
|
||||
array,
|
||||
start_t=lbar,
|
||||
stop_t=rbar,
|
||||
)
|
||||
|
||||
# TODO: maybe we should return this from the slicer call
|
||||
# above?
|
||||
in_view = array[read_slc]
|
||||
if in_view.size:
|
||||
abs_indx = in_view['index']
|
||||
abs_slc = slice(
|
||||
int(abs_indx[0]),
|
||||
int(abs_indx[-1]),
|
||||
)
|
||||
|
||||
if profiler:
|
||||
profiler(
|
||||
'`slice_from_time('
|
||||
f'start_t={lbar}'
|
||||
f'stop_t={rbar})'
|
||||
)
|
||||
|
||||
# array-index slicing
|
||||
# TODO: can we do time based indexing using arithmetic presuming
|
||||
# a uniform time stamp step size?
|
||||
else:
|
||||
# get read-relative indices adjusting for master shm index.
|
||||
lbar_i = max(l, ifirst) - ifirst
|
||||
rbar_i = min(r, ilast) - ifirst
|
||||
|
||||
# NOTE: the slice here does NOT include the extra ``+ 1``
|
||||
# BUT the ``in_view`` slice DOES..
|
||||
read_slc = slice(lbar_i, rbar_i)
|
||||
in_view = array[lbar_i: rbar_i + 1]
|
||||
|
||||
# XXX: same as ^
|
||||
# to_draw = array[lbar - ifirst:(rbar - ifirst) + 1]
|
||||
if profiler:
|
||||
profiler('index arithmetic for slicing')
|
||||
|
||||
if array_field:
|
||||
array = array[array_field]
|
||||
|
||||
return (
|
||||
# abs indices + full data set
|
||||
abs_slc.start,
|
||||
abs_slc.stop,
|
||||
array,
|
||||
|
||||
# relative (read) indices + in view data
|
||||
read_slc.start,
|
||||
read_slc.stop,
|
||||
in_view,
|
||||
)
|
||||
|
||||
def update_graphics(
|
||||
self,
|
||||
use_vr: bool = True,
|
||||
render: bool = True,
|
||||
array_key: str | None = None,
|
||||
|
||||
profiler: Profiler | None = None,
|
||||
do_append: bool = True,
|
||||
|
||||
**kwargs,
|
||||
|
||||
) -> pg.GraphicsObject:
|
||||
'''
|
||||
Read latest datums from shm and render to (incrementally)
|
||||
render to graphics.
|
||||
|
||||
'''
|
||||
profiler = Profiler(
|
||||
msg=f'Viz.update_graphics() for {self.name}',
|
||||
disabled=not pg_profile_enabled(),
|
||||
ms_threshold=4,
|
||||
# ms_threshold=ms_slower_then,
|
||||
)
|
||||
# shm read and slice to view
|
||||
read = (
|
||||
xfirst, xlast, src_array,
|
||||
ivl, ivr, in_view,
|
||||
) = self.read(profiler=profiler)
|
||||
|
||||
profiler('read src shm data')
|
||||
|
||||
graphics = self.graphics
|
||||
|
||||
if (
|
||||
not in_view.size
|
||||
or not render
|
||||
):
|
||||
# print('exiting early')
|
||||
return graphics
|
||||
|
||||
should_redraw: bool = False
|
||||
|
||||
# TODO: probably specialize ``Renderer`` types instead of
|
||||
# these logic checks?
|
||||
# - put these blocks into a `.load_renderer()` meth?
|
||||
# - consider a OHLCRenderer, StepCurveRenderer, Renderer?
|
||||
r = self._src_r
|
||||
if isinstance(graphics, BarItems):
|
||||
# XXX: special case where we change out graphics
|
||||
# to a line after a certain uppx threshold.
|
||||
(
|
||||
graphics,
|
||||
r,
|
||||
should_redraw,
|
||||
) = render_baritems(
|
||||
self,
|
||||
graphics,
|
||||
read,
|
||||
profiler,
|
||||
**kwargs,
|
||||
)
|
||||
|
||||
elif not r:
|
||||
if isinstance(graphics, StepCurve):
|
||||
|
||||
r = self._src_r = Renderer(
|
||||
viz=self,
|
||||
fmtr=StepCurveFmtr(
|
||||
shm=self.shm,
|
||||
viz=self,
|
||||
),
|
||||
)
|
||||
|
||||
else:
|
||||
r = self._src_r
|
||||
if not r:
|
||||
# just using for ``.diff()`` atm..
|
||||
r = self._src_r = Renderer(
|
||||
viz=self,
|
||||
fmtr=IncrementalFormatter(
|
||||
shm=self.shm,
|
||||
viz=self,
|
||||
),
|
||||
)
|
||||
|
||||
# ``Curve`` derivative case(s):
|
||||
array_key = array_key or self.name
|
||||
# print(array_key)
|
||||
|
||||
# ds update config
|
||||
new_sample_rate: bool = False
|
||||
should_ds: bool = r._in_ds
|
||||
showing_src_data: bool = not r._in_ds
|
||||
|
||||
# downsampling incremental state checking
|
||||
# check for and set std m4 downsample conditions
|
||||
uppx = graphics.x_uppx()
|
||||
uppx_diff = (uppx - self._last_uppx)
|
||||
profiler(f'diffed uppx {uppx}')
|
||||
if (
|
||||
uppx > 1
|
||||
and abs(uppx_diff) >= 1
|
||||
):
|
||||
log.debug(
|
||||
f'{array_key} sampler change: {self._last_uppx} -> {uppx}'
|
||||
)
|
||||
self._last_uppx = uppx
|
||||
|
||||
new_sample_rate = True
|
||||
showing_src_data = False
|
||||
should_ds = True
|
||||
should_redraw = True
|
||||
|
||||
elif (
|
||||
uppx <= 2
|
||||
and self._in_ds
|
||||
):
|
||||
# we should de-downsample back to our original
|
||||
# source data so we clear our path data in prep
|
||||
# to generate a new one from original source data.
|
||||
new_sample_rate = True
|
||||
should_ds = False
|
||||
should_redraw = True
|
||||
showing_src_data = True
|
||||
|
||||
# MAIN RENDER LOGIC:
|
||||
# - determine in view data and redraw on range change
|
||||
# - determine downsampling ops if needed
|
||||
# - (incrementally) update ``QPainterPath``
|
||||
|
||||
out = r.render(
|
||||
read,
|
||||
array_key,
|
||||
profiler,
|
||||
uppx=uppx,
|
||||
# use_vr=True,
|
||||
|
||||
# TODO: better way to detect and pass this?
|
||||
# if we want to eventually cache renderers for a given uppx
|
||||
# we should probably use this as a key + state?
|
||||
should_redraw=should_redraw,
|
||||
new_sample_rate=new_sample_rate,
|
||||
should_ds=should_ds,
|
||||
showing_src_data=showing_src_data,
|
||||
|
||||
do_append=do_append,
|
||||
)
|
||||
|
||||
if not out:
|
||||
log.warning(f'{self.name} failed to render!?')
|
||||
return graphics
|
||||
|
||||
path, reset = out
|
||||
|
||||
# XXX: SUPER UGGGHHH... without this we get stale cache
|
||||
# graphics that don't update until you downsampler again..
|
||||
if reset:
|
||||
with graphics.reset_cache():
|
||||
# assign output paths to graphicis obj
|
||||
graphics.path = r.path
|
||||
graphics.fast_path = r.fast_path
|
||||
|
||||
# XXX: we don't need this right?
|
||||
# graphics.draw_last_datum(
|
||||
# path,
|
||||
# src_array,
|
||||
# reset,
|
||||
# array_key,
|
||||
# index_field=self.index_field,
|
||||
# )
|
||||
# graphics.update()
|
||||
# profiler('.update()')
|
||||
else:
|
||||
# assign output paths to graphicis obj
|
||||
graphics.path = r.path
|
||||
graphics.fast_path = r.fast_path
|
||||
|
||||
graphics.draw_last_datum(
|
||||
path,
|
||||
src_array,
|
||||
reset,
|
||||
array_key,
|
||||
index_field=self.index_field,
|
||||
)
|
||||
graphics.update()
|
||||
profiler('.update()')
|
||||
|
||||
# TODO: does this actuallly help us in any way (prolly should
|
||||
# look at the source / ask ogi). I think it avoid artifacts on
|
||||
# wheel-scroll downsampling curve updates?
|
||||
# TODO: is this ever better?
|
||||
# graphics.prepareGeometryChange()
|
||||
# profiler('.prepareGeometryChange()')
|
||||
|
||||
# track downsampled state
|
||||
self._in_ds = r._in_ds
|
||||
|
||||
return graphics
|
||||
|
||||
def draw_last(
|
||||
self,
|
||||
array_key: Optional[str] = None,
|
||||
only_last_uppx: bool = False,
|
||||
|
||||
) -> None:
|
||||
|
||||
# shm read and slice to view
|
||||
(
|
||||
xfirst, xlast, src_array,
|
||||
ivl, ivr, in_view,
|
||||
) = self.read()
|
||||
|
||||
g = self.graphics
|
||||
array_key = array_key or self.name
|
||||
x, y = g.draw_last_datum(
|
||||
g.path,
|
||||
src_array,
|
||||
False, # never reset path
|
||||
array_key,
|
||||
self.index_field,
|
||||
)
|
||||
|
||||
# the renderer is downsampling we choose
|
||||
# to always try and update a single (interpolating)
|
||||
# line segment that spans and tries to display
|
||||
# the last uppx's worth of datums.
|
||||
# we only care about the last pixel's
|
||||
# worth of data since that's all the screen
|
||||
# can represent on the last column where
|
||||
# the most recent datum is being drawn.
|
||||
if (
|
||||
self._in_ds
|
||||
or only_last_uppx
|
||||
):
|
||||
dsg = self.ds_graphics or self.graphics
|
||||
|
||||
# XXX: pretty sure we don't need this?
|
||||
# if isinstance(g, Curve):
|
||||
# with dsg.reset_cache():
|
||||
uppx = self._last_uppx
|
||||
y = y[-uppx:]
|
||||
ymn, ymx = y.min(), y.max()
|
||||
# print(f'drawing uppx={uppx} mxmn line: {ymn}, {ymx}')
|
||||
try:
|
||||
iuppx = x[-uppx]
|
||||
except IndexError:
|
||||
# we're less then an x-px wide so just grab the start
|
||||
# datum index.
|
||||
iuppx = x[0]
|
||||
|
||||
dsg._last_line = QLineF(
|
||||
iuppx, ymn,
|
||||
x[-1], ymx,
|
||||
)
|
||||
# print(f'updating DS curve {self.name}')
|
||||
dsg.update()
|
||||
|
||||
else:
|
||||
# print(f'updating NOT DS curve {self.name}')
|
||||
g.update()
|
||||
|
||||
def curve_width_pxs(self) -> float:
|
||||
'''
|
||||
Return the width of the current datums in view in pixel units.
|
||||
|
||||
'''
|
||||
_, lbar, rbar, _ = self.bars_range()
|
||||
return self.view.mapViewToDevice(
|
||||
QLineF(
|
||||
lbar, 0,
|
||||
rbar, 0
|
||||
)
|
||||
).length()
|
||||
|
||||
def default_view(
|
||||
self,
|
||||
bars_from_y: int = int(616 * 3/8),
|
||||
y_offset: int = 0,
|
||||
do_ds: bool = True,
|
||||
|
||||
) -> None:
|
||||
'''
|
||||
Set the plot's viewbox to a "default" startup setting where
|
||||
we try to show the underlying data range sanely.
|
||||
|
||||
'''
|
||||
shm: ShmArray = self.shm
|
||||
array: np.ndarray = shm.array
|
||||
view: ChartView = self.plot.vb
|
||||
(
|
||||
vl,
|
||||
first_datum,
|
||||
datum_start,
|
||||
datum_stop,
|
||||
last_datum,
|
||||
vr,
|
||||
) = self.datums_range(array=array)
|
||||
|
||||
# invalid case: view is not ordered correctly
|
||||
# return and expect caller to sort it out.
|
||||
if (
|
||||
vl > vr
|
||||
):
|
||||
log.warning(
|
||||
'Skipping `.default_view()` viewbox not initialized..\n'
|
||||
f'l -> r: {vl} -> {vr}\n'
|
||||
f'datum_start -> datum_stop: {datum_start} -> {datum_stop}\n'
|
||||
)
|
||||
return
|
||||
|
||||
chartw: ChartPlotWidget = self.plot.getViewWidget()
|
||||
index_field = self.index_field
|
||||
step = self.index_step()
|
||||
|
||||
if index_field == 'time':
|
||||
# transform l -> r view range values into
|
||||
# data index domain to determine how view
|
||||
# should be reset to better match data.
|
||||
read_slc = slice_from_time(
|
||||
array,
|
||||
start_t=vl,
|
||||
stop_t=vr,
|
||||
step=step,
|
||||
)
|
||||
else:
|
||||
read_slc = slice(0, datum_stop - datum_start + 1)
|
||||
|
||||
index_iv = array[index_field][read_slc]
|
||||
uppx: float = self.graphics.x_uppx() or 1
|
||||
|
||||
# l->r distance in scene units, no larger then data span
|
||||
data_diff = last_datum - first_datum
|
||||
rl_diff = min(vr - vl, data_diff)
|
||||
|
||||
# orient by offset from the y-axis including
|
||||
# space to compensate for the L1 labels.
|
||||
if not y_offset:
|
||||
|
||||
# we get the L1 spread label "length" in view coords and
|
||||
# make sure it doesn't colide with the right-most datum in
|
||||
# view.
|
||||
_, l1_len = chartw.pre_l1_xs()
|
||||
offset = l1_len/(uppx*step)
|
||||
|
||||
# if no L1 label is present just offset by a few datums
|
||||
# from the y-axis.
|
||||
if chartw._max_l1_line_len == 0:
|
||||
offset += 3*step
|
||||
else:
|
||||
offset = (y_offset * step) + uppx*step
|
||||
|
||||
# align right side of view to the rightmost datum + the selected
|
||||
# offset from above.
|
||||
r_reset = last_datum + offset
|
||||
|
||||
# no data is in view so check for the only 2 sane cases:
|
||||
# - entire view is LEFT of data
|
||||
# - entire view is RIGHT of data
|
||||
if index_iv.size == 0:
|
||||
log.warning(f'No data in view for {vl} -> {vr}')
|
||||
|
||||
# 2 cases either the view is to the left or right of the
|
||||
# data set.
|
||||
if (
|
||||
vl <= first_datum
|
||||
and vr <= first_datum
|
||||
):
|
||||
l_reset = first_datum
|
||||
|
||||
elif (
|
||||
vl >= last_datum
|
||||
and vr >= last_datum
|
||||
):
|
||||
l_reset = r_reset - rl_diff
|
||||
|
||||
else:
|
||||
raise RuntimeError(f'Unknown view state {vl} -> {vr}')
|
||||
|
||||
else:
|
||||
# maintain the l->r view distance
|
||||
l_reset = r_reset - rl_diff
|
||||
|
||||
# remove any custom user yrange setttings
|
||||
if chartw._static_yrange == 'axis':
|
||||
chartw._static_yrange = None
|
||||
|
||||
view.setXRange(
|
||||
min=l_reset,
|
||||
max=r_reset,
|
||||
padding=0,
|
||||
)
|
||||
|
||||
if do_ds:
|
||||
view.maybe_downsample_graphics()
|
||||
view._set_yrange()
|
||||
|
||||
# caller should do this!
|
||||
# self.linked.graphics_cycle()
|
||||
|
||||
|
||||
class Renderer(msgspec.Struct):
|
||||
|
||||
viz: Viz
|
||||
|
|
|
|||
Loading…
Reference in New Issue