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Use filled rect for current step 

A `QRectF` is easier to make and draw (i think?) so use that and fill it
on volume events for decent sleek real-time look. Adjust the step array
generator to allow for an endpoints flag. Comment and/or clean out all
the old path filling calls that gave us perf issues..
fast_step_curve
Tyler Goodlet 2021-09-20 13:38:12 -04:00
parent 0876d2f4fe
commit 5bf8e6a90e
1 changed files with 42 additions and 62 deletions
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106
piker/ui/_curve.py
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@ -18,7 +18,7 @@
Fast, smooth, sexy curves.
"""
from typing import Tuple
from typing import Optional
import numpy as np
import pyqtgraph as pg
@ -37,6 +37,7 @@ from ._style import hcolor
def step_path_arrays_from_1d(
x: np.ndarray,
y: np.ndarray,
include_endpoints: bool = False,
) -> (np.ndarray, np.ndarray):
'''Generate a "step mode" curve aligned with OHLC style bars
@ -63,48 +64,26 @@ def step_path_arrays_from_1d(
# we create a 1d with 2 extra indexes to
# hold the start and (current) end value for the steps
# on either end
y2 = np.empty((len(y), 2), dtype=y.dtype)
y2[:] = y[:, np.newaxis]
y_out = np.empty(
2*len(y) + 2,
dtype=y.dtype
)
y2 = np.empty((len(y), 2), dtype=y.dtype)
y2[:] = y[:, np.newaxis]
# flatten and set 0 endpoints
y_out[1:-1] = y2.reshape(y2.size)
y_out[0] = 0
y_out[-1] = 0
if not include_endpoints:
return x_out[:-1], y_out[:-1]
else:
return x_out, y_out
def step_lines_from_point(
index: float,
level: float,
) -> Tuple[QLineF]:
# TODO: maybe consider using `QGraphicsLineItem` ??
# gives us a ``.boundingRect()`` on the objects which may make
# computing the composite bounding rect of the last bars + the
# history path faster since it's done in C++:
# https://doc.qt.io/qt-5/qgraphicslineitem.html
# index = x[0]
# level = y[0]
# (x0 - 0.5, 0) -> (x0 - 0.5, y0)
left = QLineF(index - 0.5, 0, index - 0.5, level)
# (x0 - 0.5, y0) -> (x1 + 0.5, y1)
top = QLineF(index - 0.5, level, index + 0.5, level)
# (x1 + 0.5, y1 -> (x1 + 0.5, 0)
right = QLineF(index + 0.5, level, index + 0.5, 0)
return [left, top, right]
# TODO: got a feeling that dropping this inheritance gets us even more speedups
class FastAppendCurve(pg.PlotCurveItem):
@ -112,7 +91,11 @@ class FastAppendCurve(pg.PlotCurveItem):
self,
*args,
step_mode: bool = False,
color: str = 'default_lightest',
fill_color: Optional[str] = None,
**kwargs
) -> None:
# TODO: we can probably just dispense with the parent since
@ -120,13 +103,12 @@ class FastAppendCurve(pg.PlotCurveItem):
super().__init__(*args, **kwargs)
self._last_line: QLineF = None
self._xrange: Tuple[int, int] = self.dataBounds(ax=0)
self._xrange: tuple[int, int] = self.dataBounds(ax=0)
self._step_mode: bool = step_mode
self._fill = False
color = hcolor('davies')
self.setBrush(color)
self.setPen(color)
self.setBrush(hcolor(fill_color or color))
self.setPen(hcolor(color))
# TODO: one question still remaining is if this makes trasform
# interactions slower (such as zooming) and if so maybe if/when
@ -168,8 +150,8 @@ class FastAppendCurve(pg.PlotCurveItem):
)
profiler('generate fresh path')
if self._step_mode:
self.path.closeSubpath()
# if self._step_mode:
# self.path.closeSubpath()
# TODO: get this working - right now it's giving heck on vwap...
# if prepend_length:
@ -187,13 +169,14 @@ class FastAppendCurve(pg.PlotCurveItem):
# # self.path.moveTo(new_x[0], new_y[0])
# self.path.connectPath(old_path)
if append_length:
elif append_length:
if self._step_mode:
new_x = x[-append_length - 2:-1]
new_y = y[-append_length - 2:-1]
new_x, new_y = step_path_arrays_from_1d(new_x, new_y)
# new_x = new_x[3:]
# new_y = new_y[3:]
new_x, new_y = step_path_arrays_from_1d(
x[-append_length - 2:-1],
y[-append_length - 2:-1],
)
new_x = new_x[1:]
new_y = new_y[1:]
else:
# print(f"append_length: {append_length}")
@ -205,28 +188,26 @@ class FastAppendCurve(pg.PlotCurveItem):
new_x,
new_y,
connect='all',
finiteCheck=False,
# finiteCheck=False,
)
if self._step_mode:
if self._fill:
path = self.path
# self.path = self.path.united(append_path).simplified()
path.addPath(append_path.simplified())
# path.connectPath(append_path.simplified())
path.closeSubpath()
# path.simplified()
if self._step_mode:
if self._fill:
# XXX: super slow set "union" op
self.path = self.path.united(append_path).simplified()
# path.addPath(append_path)
# path.closeSubpath()
else:
self.path.connectPath(append_path.simplified())
# path.addPath(append_path)
self.path.connectPath(append_path)
else:
# print(f"append_path br: {append_path.boundingRect()}")
# self.path.moveTo(new_x[0], new_y[0])
# self.path.connectPath(append_path)
self.path.connectPath(append_path.simplified())
# if self._step_mode:
# self.path.closeSubpath()
# self.fill_path.connectPath(
path.connectPath(append_path)
# XXX: pretty annoying but, without this there's little
# artefacts on the append updates to the curve...
@ -243,8 +224,7 @@ class FastAppendCurve(pg.PlotCurveItem):
self._xrange = x[0], x[-1]
if self._step_mode:
# TODO: use a ``QRectF`` and ``QPainterPath.addRect()``
self._last_step_lines = step_lines_from_point(x[-1], y[-1])
self._last_step_rect = QRectF(x[-1] - 0.5, 0, x[-1] + 0.5, y[-1])
else:
self._last_line = QLineF(x[-2], y[-2], x[-1], y[-1])
@ -301,16 +281,16 @@ class FastAppendCurve(pg.PlotCurveItem):
if self._step_mode:
p.drawLines(*tuple(filter(bool, self._last_step_lines)))
brush = self.opts['brush']
# p.drawLines(*tuple(filter(bool, self._last_step_lines)))
# p.drawRect(self._last_step_rect)
p.fillRect(self._last_step_rect, brush)
p.drawPath(self.path)
# fill_path = QtGui.QPainterPath(self.path)
# if self._fill:
# self.path.closeSubpath()
if self._fill:
print('FILLED')
p.fillPath(self.path, self.opts['brush'])
p.fillPath(self.path, brush)
profiler('.drawPath()')