Re-implement `.default_view()` on `Viz`
Since we don't really need it defined on the "chart widget" move it to a viz method and rework it to hell: - always discard the invalid view l > r case. - use the graphic's UPPX to determine UI-to-scene coordinate scaling for the L1-label collision detection, if there is no L1 just offset by a few (index step scaled) datums; this allows us to drop the 2x x-range calls as was hacked previous. - handle no-data-in-view cases explicitly and error if we get any ostensibly impossible cases. - expect caller to trigger a graphics cycle if needed. Further support this includes a rework a slew of other important details: - add `Viz.index_step`, an idempotent computed, index (presumably uniform) step value which is needed for variable sample rate graphics displayed on an epoch (second) time index. - rework `Viz.datums_range()` to pass view x-endpoints as first and last elements in return `tuple`; tighten up snap-to-data edge case logic using `max()`/`min()` calls and better internal var naming. - adjust all calls to `slice_from_time()` to not expect an "abs" slice. - drop all `.yrange` resetting since we can just have the `Renderer` do it when necessary.epoch_indexing_and_dataviz_layer
Tyler Goodlet
parent
5ab4e5493e
commit
50209752c3
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@ -25,6 +25,7 @@ incremental update.
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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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@ -49,7 +50,6 @@ from ..data._pathops import (
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)
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from ._ohlc import (
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BarItems,
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# bar_from_ohlc_row,
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)
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from ._curve import (
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Curve,
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@ -63,6 +63,11 @@ from .._profile import (
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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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@ -231,11 +236,13 @@ class Viz(msgspec.Struct): # , frozen=True):
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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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@ -244,12 +251,6 @@ class Viz(msgspec.Struct): # , frozen=True):
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tuple[Renderer, pg.GraphicsItem],
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] = (None, None)
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# TODO: hackery to be able to set a shm later
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# but whilst also allowing this type to hashable,
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# likely will require serializable token that is used to attach
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# to the underlying shm ref after startup?
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# _shm: Optional[ShmArray] = None # currently, may be filled in "later"
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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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@ -261,6 +262,17 @@ class Viz(msgspec.Struct): # , frozen=True):
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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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@ -275,23 +287,35 @@ class Viz(msgspec.Struct): # , frozen=True):
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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 = (lbar, rbar)
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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 = 'btc' in self.name
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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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breakpoint()
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return None
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arr = shm.array
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# times = arr['time']
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# step = round(times[-1] - times[-2])
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# if (
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# do_print
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# and step == 60
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# ):
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# breakpoint()
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# get relative slice indexes into array
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if self.index_field == 'time':
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(
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abs_slc,
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read_slc,
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) = slice_from_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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@ -306,11 +330,17 @@ class Viz(msgspec.Struct): # , frozen=True):
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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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# breakpoint()
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return None
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elif self.yrange:
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mxmn = self.yrange
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# print(f'{self.name} M4 maxmin: {mxmn}')
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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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@ -323,7 +353,11 @@ class Viz(msgspec.Struct): # , frozen=True):
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yhigh = np.max(view)
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mxmn = ylow, yhigh
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# print(f'{self.name} MANUAL maxmin: {mxmn}')
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if do_print:
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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}'
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)
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# cache result for input range
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assert mxmn
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@ -333,8 +367,7 @@ class Viz(msgspec.Struct): # , frozen=True):
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def view_range(self) -> tuple[int, int]:
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'''
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Return the indexes in view for the associated
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plot displaying this viz's data.
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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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@ -345,15 +378,18 @@ class Viz(msgspec.Struct): # , frozen=True):
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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 bars present in view.
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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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start, l, datum_start, datum_stop, r, stop = self.datums_range()
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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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@ -362,39 +398,54 @@ class Viz(msgspec.Struct): # , frozen=True):
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Return a range tuple for the datums present in view.
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'''
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l, r = self.view_range()
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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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array = self.shm.array
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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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start = index[0]
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stop = index[-1]
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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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l < 0
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or r < l
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or l < start
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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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datum_start = start
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datum_stop = stop
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leftmost = first
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rightmost = last
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else:
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datum_start = max(l, start)
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datum_stop = r
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if l < stop:
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datum_stop = min(r, stop)
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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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assert datum_start < datum_stop
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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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start,
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l, # left x-in-view
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datum_start,
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datum_stop,
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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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stop,
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)
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def read(
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@ -415,6 +466,7 @@ class Viz(msgspec.Struct): # , frozen=True):
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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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@ -423,13 +475,17 @@ class Viz(msgspec.Struct): # , frozen=True):
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profiler('self.shm.array READ')
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(
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ifirst,
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l,
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ifirst,
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lbar,
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rbar,
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r,
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ilast,
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) = self.datums_range(index_field=index_field)
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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 rbar < lbar:
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# breakpoint()
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@ -440,26 +496,22 @@ class Viz(msgspec.Struct): # , frozen=True):
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# TODO: support time slicing
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if index_field == 'time':
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(
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abs_slc,
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read_slc,
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) = slice_from_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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in_view = array[read_slc]
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# diff = rbar - lbar
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# if (
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# 'btc' in self.name
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# and 'hist' not in self.shm.token
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# ):
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# print(
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# f'{self.name}: len(iv) = {len(in_view)}\n'
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# f'start/stop: {lbar},{rbar}\n',
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# f'diff: {diff}\n',
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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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@ -635,8 +687,6 @@ class Viz(msgspec.Struct): # , frozen=True):
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should_redraw = True
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showing_src_data = True
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# reset yrange to be computed from source data
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self.yrange = None
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# MAIN RENDER LOGIC:
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# - determine in view data and redraw on range change
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@ -662,10 +712,6 @@ class Viz(msgspec.Struct): # , frozen=True):
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**rkwargs,
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)
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if showing_src_data:
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# print(f"{self.name} SHOWING SOURCE")
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# reset yrange to be computed from source data
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self.yrange = None
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if not out:
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log.warning(f'{self.name} failed to render!?')
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@ -678,7 +724,6 @@ class Viz(msgspec.Struct): # , frozen=True):
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# XXX: SUPER UGGGHHH... without this we get stale cache
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# graphics that don't update until you downsampler again..
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# reset = False
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# if reset:
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# with graphics.reset_cache():
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# # assign output paths to graphicis obj
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@ -798,6 +843,129 @@ class Viz(msgspec.Struct): # , frozen=True):
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)
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).length()
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def default_view(
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self,
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bars_from_y: int = int(616 * 3/8),
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y_offset: int = 0,
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do_ds: bool = True,
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) -> None:
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'''
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Set the plot's viewbox to a "default" startup setting where
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we try to show the underlying data range sanely.
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'''
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shm: ShmArray = self.shm
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array: np.ndarray = shm.array
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view: ChartView = self.plot.vb
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(
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vl,
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first_datum,
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datum_start,
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datum_stop,
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last_datum,
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vr,
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) = self.datums_range(array=array)
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# invalid case: view is not ordered correctly
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# return and expect caller to sort it out.
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if (
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vl > vr
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):
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log.warning(
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'Skipping `.default_view()` viewbox not initialized..\n'
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f'l -> r: {vl} -> {vr}\n'
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f'datum_start -> datum_stop: {datum_start} -> {datum_stop}\n'
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)
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return
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chartw: ChartPlotWidget = self.plot.getViewWidget()
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index_field = self.index_field
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step = self.index_step()
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if index_field == 'time':
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# transform l -> r view range values into
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# data index domain to determine how view
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# should be reset to better match data.
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read_slc = slice_from_time(
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array,
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start_t=vl,
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stop_t=vr,
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step=step,
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)
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index_iv = array[index_field][read_slc]
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uppx: float = self.graphics.x_uppx() or 1
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# l->r distance in scene units, no larger then data span
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data_diff = last_datum - first_datum
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rl_diff = min(vr - vl, data_diff)
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# orient by offset from the y-axis including
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# space to compensate for the L1 labels.
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if not y_offset:
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# we get the L1 spread label "length" in view coords and
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# make sure it doesn't colide with the right-most datum in
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# view.
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_, l1_len = chartw.pre_l1_xs()
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offset = l1_len/(uppx*step)
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# if no L1 label is present just offset by a few datums
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# from the y-axis.
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if chartw._max_l1_line_len == 0:
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offset += 3*step
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else:
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offset = (y_offset * step) + uppx*step
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# align right side of view to the rightmost datum + the selected
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# offset from above.
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r_reset = last_datum + offset
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# no data is in view so check for the only 2 sane cases:
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# - entire view is LEFT of data
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# - entire view is RIGHT of data
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if index_iv.size == 0:
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log.warning(f'No data in view for {vl} -> {vr}')
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# 2 cases either the view is to the left or right of the
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# data set.
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if (
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vl <= first_datum
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and vr <= first_datum
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):
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l_reset = first_datum
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elif (
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vl >= last_datum
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and vr >= last_datum
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):
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l_reset = r_reset - rl_diff
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else:
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raise RuntimeError(f'Unknown view state {vl} -> {vr}')
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else:
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# maintain the l->r view distance
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l_reset = r_reset - rl_diff
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# remove any custom user yrange setttings
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if chartw._static_yrange == 'axis':
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chartw._static_yrange = None
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view.setXRange(
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min=l_reset,
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max=r_reset,
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padding=0,
|
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)
|
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|
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if do_ds:
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view.maybe_downsample_graphics()
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view._set_yrange()
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# caller should do this!
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# self.linked.graphics_cycle()
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class Renderer(msgspec.Struct):
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|
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|
|
@ -959,6 +1127,8 @@ class Renderer(msgspec.Struct):
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fast_path = self.fast_path
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reset = False
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|
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self.viz.yrange = None
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|
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# redraw the entire source data if we have either of:
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# - no prior path graphic rendered or,
|
||||
# - we always intend to re-render the data only in view
|
||||
|
|
|
|||
Loading…
Reference in New Issue