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Add basic optional polyline support, draft out downsampling routine

big_data_lines
Tyler Goodlet 2022-03-09 11:07:53 -05:00
parent 7e853fe345
commit 7811508307
1 changed files with 125 additions and 37 deletions
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162
piker/ui/_curve.py
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@ -23,6 +23,7 @@ from typing import Optional
import numpy as np
import pyqtgraph as pg
from PyQt5 import QtGui, QtWidgets
from PyQt5.QtWidgets import QGraphicsItem
from PyQt5.QtCore import (
Qt,
QLineF,
@ -94,6 +95,38 @@ _line_styles: dict[str, int] = {
}
def downsample(
x: np.ndarray,
y: np.ndarray,
bins: int,
method: str = 'peak',
) -> tuple[np.ndarray, np.ndarray]:
'''
Downsample x/y data for lesser curve graphics gen.
The "peak" method is originally copied verbatim from
``pyqtgraph.PlotDataItem.getDisplayDataset()``.
'''
match method:
case 'peak':
ds = bins
n = len(x) // ds
x1 = np.empty((n, 2))
# start of x-values; try to select a somewhat centered point
stx = ds//2
x1[:] = x[stx:stx+n*ds:ds, np.newaxis]
x = x1.reshape(n*2)
y1 = np.empty((n, 2))
y2 = y[:n*ds].reshape((n, ds))
y1[:, 0] = y2.max(axis=1)
y1[:, 1] = y2.min(axis=1)
y = y1.reshape(n*2)
return x, y
# TODO: got a feeling that dropping this inheritance gets us even more speedups
class FastAppendCurve(pg.PlotCurveItem):
'''
@ -116,17 +149,23 @@ class FastAppendCurve(pg.PlotCurveItem):
fill_color: Optional[str] = None,
style: str = 'solid',
name: Optional[str] = None,
use_polyline: bool = False,
**kwargs
) -> None:
self._name = name
# TODO: we can probably just dispense with the parent since
# we're basically only using the pen setting now...
super().__init__(*args, **kwargs)
self._name = name
self._xrange: tuple[int, int] = self.dataBounds(ax=0)
# self._last_draw = time.time()
self._use_poly = use_polyline
self.poly = None
# all history of curve is drawn in single px thickness
pen = pg.mkPen(hcolor(color))
pen.setStyle(_line_styles[style])
@ -153,12 +192,14 @@ class FastAppendCurve(pg.PlotCurveItem):
# interactions slower (such as zooming) and if so maybe if/when
# we implement a "history" mode for the view we disable this in
# that mode?
if step_mode:
if step_mode or self._use_poly:
# don't enable caching by default for the case where the
# only thing drawn is the "last" line segment which can
# have a weird artifact where it won't be fully drawn to its
# endpoint (something we saw on trade rate curves)
self.setCacheMode(QtWidgets.QGraphicsItem.DeviceCoordinateCache)
self.setCacheMode(
QGraphicsItem.DeviceCoordinateCache
)
def update_from_array(
self,
@ -195,12 +236,20 @@ class FastAppendCurve(pg.PlotCurveItem):
x_out, y_out = x[:-1], y[:-1]
if self.path is None or prepend_length > 0:
self.path = pg.functions.arrayToQPath(
x_out,
y_out,
connect='all',
finiteCheck=False,
)
if self._use_poly:
self.poly = pg.functions.arrayToQPolygonF(
x_out,
y_out,
)
else:
self.path = pg.functions.arrayToQPath(
x_out,
y_out,
connect='all',
finiteCheck=False,
)
profiler('generate fresh path')
# if self._step_mode:
@ -242,18 +291,27 @@ class FastAppendCurve(pg.PlotCurveItem):
new_y = y[-append_length - 2:-1]
# print((new_x, new_y))
append_path = pg.functions.arrayToQPath(
new_x,
new_y,
connect='all',
# finiteCheck=False,
)
if self._use_poly:
union_poly = pg.functions.arrayToQPolygonF(
new_x,
new_y,
)
else:
append_path = pg.functions.arrayToQPath(
new_x,
new_y,
connect='all',
finiteCheck=False,
)
path = self.path
# other merging ideas:
# https://stackoverflow.com/questions/8936225/how-to-merge-qpainterpaths
if self._step_mode:
assert not self._use_poly, 'Dunno howw this worx yet'
# path.addPath(append_path)
self.path.connectPath(append_path)
@ -269,19 +327,26 @@ class FastAppendCurve(pg.PlotCurveItem):
# # path.closeSubpath()
else:
# print(f"append_path br: {append_path.boundingRect()}")
# self.path.moveTo(new_x[0], new_y[0])
# self.path.connectPath(append_path)
path.connectPath(append_path)
if self._use_poly:
self.poly = self.poly.united(union_poly)
else:
# print(f"append_path br: {append_path.boundingRect()}")
# self.path.moveTo(new_x[0], new_y[0])
self.path.connectPath(append_path)
# path.connectPath(append_path)
# XXX: lol this causes a hang..
# self.path = self.path.simplified()
self.disable_cache()
flip_cache = True
if (
self._step_mode
):
self.disable_cache()
flip_cache = True
# XXX: do we need this any more?
# if (
# self._step_mode
# ):
# self.disable_cache()
# flip_cache = True
# print(f"update br: {self.path.boundingRect()}")
@ -318,7 +383,7 @@ class FastAppendCurve(pg.PlotCurveItem):
if flip_cache:
# XXX: seems to be needed to avoid artifacts (see above).
self.setCacheMode(QtWidgets.QGraphicsItem.DeviceCoordinateCache)
self.setCacheMode(QGraphicsItem.DeviceCoordinateCache)
def disable_cache(self) -> None:
'''
@ -334,15 +399,22 @@ class FastAppendCurve(pg.PlotCurveItem):
'''
Compute and then cache our rect.
'''
if self.path is None:
return QtGui.QPainterPath().boundingRect()
if self._use_poly:
if self.poly is None:
return QtGui.QPolygonF().boundingRect()
else:
br = self.boundingRect = self.poly.boundingRect
return br()
else:
# dynamically override this method after initial
# path is created to avoid requiring the above None check
self.boundingRect = self._br
return self._br()
if self.path is None:
return QtGui.QPainterPath().boundingRect()
else:
# dynamically override this method after initial
# path is created to avoid requiring the above None check
self.boundingRect = self._path_br
return self._path_br()
def _br(self):
def _path_br(self):
'''
Post init ``.boundingRect()```.
@ -373,7 +445,9 @@ class FastAppendCurve(pg.PlotCurveItem):
) -> None:
profiler = pg.debug.Profiler(disabled=not pg_profile_enabled())
profiler = pg.debug.Profiler(
# disabled=False, #not pg_profile_enabled(),
)
# p.setRenderHint(p.Antialiasing, True)
if (
@ -395,12 +469,26 @@ class FastAppendCurve(pg.PlotCurveItem):
p.setPen(self.opts['pen'])
# else:
p.drawPath(self.path)
profiler('.drawPath()')
if self._use_poly:
assert self.poly
p.drawPolyline(self.poly)
profiler('.drawPolyline()')
else:
p.drawPath(self.path)
profiler('.drawPath()')
# TODO: try out new work from `pyqtgraph` main which
# should repair horrid perf:
# TODO: try out new work from `pyqtgraph` main which should
# repair horrid perf (pretty sure i did and it was still
# horrible?):
# https://github.com/pyqtgraph/pyqtgraph/pull/2032
# if self._fill:
# brush = self.opts['brush']
# p.fillPath(self.path, brush)
# now = time.time()
# print(f'DRAW RATE {1/(now - self._last_draw)}')
# self._last_draw = now
# import time
# _last_draw: float = time.time()