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Add `Viz.view_state: ViewState` 

Adds a small struct which is used to track the most recently viewed
data's x/y ranges as well as the last `Viz.read()` "in view" array data
for fast access by chart related graphics processing code, namely view
mode overlay handling.

Also adds new `Viz` interfaces:
- `Viz.ds_yrange: tuple[float, float]' which replaces the previous
  `.yrange` (now set by `.datums_range()` on manual y-range calcs) so
  that the m4 downsampler can set this field specifically and then it
  get used (when available) by `Viz.maxmin()`.
- `Viz.scalars_from_index()` a new returns-scalar generator which can be
  used to calc the up and down returns values (used for scaling overlay
  y-ranges) from an input `xref` x-domain index which maps to some
  `Ci(xref) = yref`.
log_linearized_curve_overlays
Tyler Goodlet 2023-02-24 13:38:45 -05:00
parent 26690b061b
commit 62e0889bf5
1 changed files with 127 additions and 42 deletions
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169
piker/ui/_dataviz.py
View File

@ -29,7 +29,10 @@ from typing import (
TYPE_CHECKING,
)
import msgspec
from msgspec import (
Struct,
field,
)
import numpy as np
import pyqtgraph as pg
from PyQt5.QtCore import QLineF
@ -225,15 +228,49 @@ def render_baritems(
_sample_rates: set[float] = {1, 60}
class Viz(msgspec.Struct): # , frozen=True):
class ViewState(Struct):
'''
Indexing objects representing the current view x-range -> y-range.
'''
# (xl, xr) "input" view range in x-domain
xrange: tuple[
float | int,
float | int
] | None = None
# (ymn, ymx) "output" min and max in viewed y-codomain
yrange: tuple[
float | int,
float | int
] | None = None
# last in view ``ShmArray.array[read_slc]`` data
in_view: np.ndarray | None = None
class Viz(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.
update, oriented around the idea of a "view state".
The intention is for this type to eventually be capable of shm-passing
of incrementally updated graphics stream data between actors.
The (backend) intention is for this interface and type is to
eventually be capable of shm-passing of incrementally updated
graphics stream data, thus providing a cross-actor solution to
sharing UI-related update state potentionally in a (compressed)
binary-interchange format.
Further, from an interaction-triggers-view-in-UI perspective, this type
operates as a transform:
(x_left, x_right) -> output metrics {ymn, ymx, uppx, ...}
wherein each x-domain range maps to some output set of (graphics
related) vizualization metrics. In further documentation we often
refer to this abstraction as a vizualization curve: Ci. Each Ci is
considered a function which maps an x-range (input view range) to
a multi-variate (metrics) output.
'''
name: str
@ -242,8 +279,12 @@ class Viz(msgspec.Struct): # , frozen=True):
flume: Flume
graphics: Curve | BarItems
# for tracking y-mn/mx for y-axis auto-ranging
yrange: tuple[float, float] = None
view_state: ViewState = field(default_factory=ViewState)
# last calculated y-mn/mx from m4 downsample code, this
# is updated in the body of `Renderer.render()`.
ds_yrange: tuple[float, float] | None = None
yrange: tuple[float, float] | None = None
# in some cases a viz may want to change its
# graphical "type" or, "form" when downsampling, to
@ -264,7 +305,7 @@ class Viz(msgspec.Struct): # , frozen=True):
] = 'time'
# downsampling state
# TODO: maybe compound this into a downsampling state type?
_last_uppx: float = 0
_in_ds: bool = False
_index_step: float | None = None
@ -303,14 +344,23 @@ class Viz(msgspec.Struct): # , frozen=True):
@property
def index_field(self) -> str:
'''
The column name as ``str`` in the underlying ``._shm: ShmArray``
which will deliver the "index" array.
'''
return self._index_field
def index_step(
self,
reset: bool = False,
) -> float:
'''
Return the size between sample steps in the units of the
x-domain, normally either an ``int`` array index size or an
epoch time in seconds.
'''
# attempt to dectect the best step size by scanning a sample of
# the source data.
if self._index_step is None:
@ -393,7 +443,7 @@ class Viz(msgspec.Struct): # , frozen=True):
# TODO: hash the slice instead maybe?
# https://stackoverflow.com/a/29980872
lbar, rbar = ixrng = round(x_range[0]), round(x_range[1])
ixrng = lbar, rbar = round(x_range[0]), round(x_range[1])
if use_caching:
cached_result = self._mxmns.get(ixrng)
@ -436,8 +486,8 @@ class Viz(msgspec.Struct): # , frozen=True):
)
return None
elif self.yrange:
mxmn = self.yrange
elif self.ds_yrange:
mxmn = self.ds_yrange
if do_print:
print(
f'{self.name} M4 maxmin:\n'
@ -477,19 +527,6 @@ class Viz(msgspec.Struct): # , frozen=True):
mxmn,
)
@lru_cache(maxsize=6116)
def median_from_range(
self,
start: int,
stop: int,
) -> float:
in_view = self.shm.array[start:stop]
if self.is_ohlc:
return np.median(in_view['close'])
else:
return np.median(in_view[self.name])
def view_range(self) -> tuple[int, int]:
'''
Return the start and stop x-indexes for the managed ``ViewBox``.
@ -514,7 +551,7 @@ class Viz(msgspec.Struct): # , frozen=True):
self,
view_range: None | tuple[float, float] = None,
index_field: str | None = None,
array: None | np.ndarray = None,
array: np.ndarray | None = None,
) -> tuple[
int, int, int, int, int, int
@ -527,29 +564,34 @@ class Viz(msgspec.Struct): # , frozen=True):
index_field: str = index_field or self.index_field
if index_field == 'index':
l, r = round(l), round(r)
l: int = round(l)
r: int = round(r)
if array is None:
array = self.shm.array
index = array[index_field]
first = floor(index[0])
last = ceil(index[-1])
first: int = floor(index[0])
last: int = ceil(index[-1])
# first and last datums in view determined by
# l / r view range.
leftmost = floor(l)
rightmost = ceil(r)
# l -> r view range.
leftmost: int = floor(l)
rightmost: int = ceil(r)
# invalid view state
if (
r < l
or l < 0
or r < 0
or (l > last and r > last)
or (
l > last
and r > last
)
):
leftmost = first
rightmost = last
leftmost: int = first
rightmost: int = last
else:
rightmost = max(
min(last, rightmost),
@ -562,7 +604,10 @@ class Viz(msgspec.Struct): # , frozen=True):
rightmost - 1,
)
assert leftmost < rightmost
# sanity
# assert leftmost < rightmost
self.view_state.xrange = leftmost, rightmost
return (
l, # left x-in-view
@ -591,11 +636,9 @@ class Viz(msgspec.Struct): # , frozen=True):
'''
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')
@ -607,7 +650,6 @@ class Viz(msgspec.Struct): # , frozen=True):
ilast,
r,
) = self.datums_range(
view_range=vr,
index_field=index_field,
array=array,
)
@ -629,11 +671,14 @@ class Viz(msgspec.Struct): # , frozen=True):
# above?
in_view = array[read_slc]
if in_view.size:
self.view_state.in_view = in_view
abs_indx = in_view['index']
abs_slc = slice(
int(abs_indx[0]),
int(abs_indx[-1]),
)
else:
self.view_state.in_view = None
if profiler:
profiler(
@ -654,10 +699,11 @@ class Viz(msgspec.Struct): # , frozen=True):
# BUT the ``in_view`` slice DOES..
read_slc = slice(lbar_i, rbar_i)
in_view = array[lbar_i: rbar_i + 1]
self.view_state.in_view = in_view
# in_view = array[lbar_i-1: rbar_i+1]
# XXX: same as ^
# to_draw = array[lbar - ifirst:(rbar - ifirst) + 1]
if profiler:
profiler('index arithmetic for slicing')
@ -692,8 +738,8 @@ class Viz(msgspec.Struct): # , frozen=True):
pg.GraphicsObject,
]:
'''
Read latest datums from shm and render to (incrementally)
render to graphics.
Read latest datums from shm and (incrementally) render to
graphics.
'''
profiler = Profiler(
@ -1262,3 +1308,42 @@ class Viz(msgspec.Struct): # , frozen=True):
vr, 0,
)
).length()
@lru_cache(maxsize=6116)
def median_from_range(
self,
start: int,
stop: int,
) -> float:
in_view = self.shm.array[start:stop]
if self.is_ohlc:
return np.median(in_view['close'])
else:
return np.median(in_view[self.name])
@lru_cache(maxsize=6116)
def dispersion(
start: int,
stop: int,
) -> float:
pass
def scalars_from_index(
self,
xref: float,
) -> tuple[float, float]:
arr = self.view_state.in_view
slc = slice_from_time(
arr=self.view_state.in_view,
start_t=xref,
stop_t=xref,
)
yref = arr[slc.start]
ymn, ymx = self.view_state.yrange
return (
(ymn - yref) / yref,
(ymx - yref) / yref,
)