Add `Flow.ds_graphics': a downsample curve ref

Allows for optionally updating a "downsampled" graphics type which is
currently necessary in the `BarItems` -> `FlattenedOHLC` curve switching
case; we don't want to be needlessly redrawing the `Flow.graphics`
object (which will be an OHLC curve) when in flattened curve mode.
Further add a `only_last_uppx: bool` flag to `.draw_last()` to allow
forcing a "last uppx's worth of data max/min" style interpolating line
as needed.
update_last_datums_in_view
Tyler Goodlet 2022-06-09 17:07:31 -04:00
parent 633fa7cc3a
commit 4099b53ea2
1 changed files with 53 additions and 17 deletions

View File

@ -175,6 +175,7 @@ def render_baritems(
name=f'{flow.name}_ds_ohlc',
color=bars._color,
)
flow.ds_graphics = curve
curve.hide()
self.plot.addItem(curve)
@ -192,18 +193,20 @@ def render_baritems(
uppx = curve.x_uppx()
in_line = should_line = curve.isVisible()
if (
should_line
in_line
and uppx < x_gt
):
# print('FLIPPING TO BARS')
should_line = False
flow._in_ds = False
elif (
not should_line
not in_line
and uppx >= x_gt
):
# print('FLIPPING TO LINE')
should_line = True
flow._in_ds = True
profiler(f'ds logic complete line={should_line}')
@ -333,7 +336,13 @@ class Flow(msgspec.Struct): # , frozen=True):
'''
name: str
plot: pg.PlotItem
graphics: Curve
graphics: Union[Curve, BarItems]
# in some cases a flow may want to change its
# graphical "type" or, "form" when downsampling,
# normally this is just a plain line.
ds_graphics: Optional[Curve] = None
_shm: ShmArray
is_ohlc: bool = False
@ -540,6 +549,7 @@ class Flow(msgspec.Struct): # , frozen=True):
should_redraw: bool = False
rkwargs = {}
should_line = False
if isinstance(graphics, BarItems):
# XXX: special case where we change out graphics
# to a line after a certain uppx threshold.
@ -556,8 +566,8 @@ class Flow(msgspec.Struct): # , frozen=True):
profiler,
**kwargs,
)
# bars = True
should_redraw = changed_to_line or not should_line
self._in_ds = should_line
else:
r = self._src_r
@ -661,6 +671,17 @@ class Flow(msgspec.Struct): # , frozen=True):
# 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,
# data,
# reset,
# array_key,
# )
# graphics.update()
# profiler('.update()')
else:
# assign output paths to graphicis obj
graphics.path = r.path
@ -673,16 +694,15 @@ class Flow(msgspec.Struct): # , frozen=True):
reset,
array_key,
)
# TODO: is this ever better?
# graphics.prepareGeometryChange()
# profiler('.prepareGeometryChange()')
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?
graphics.update()
profiler('.update()')
# TODO: is this ever better?
# graphics.prepareGeometryChange()
# profiler('.prepareGeometryChange()')
# track downsampled state
self._in_ds = r._in_ds
@ -692,6 +712,7 @@ class Flow(msgspec.Struct): # , frozen=True):
def draw_last(
self,
array_key: Optional[str] = None,
only_last_uppx: bool = False,
) -> None:
@ -711,19 +732,34 @@ class Flow(msgspec.Struct): # , frozen=True):
array_key,
)
if self._in_ds:
# 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.
# the renderer is downsampling we choose
# to always try and updadte a single (interpolating)
# line segment that spans and tries to display
# the las 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}')
g._last_line = QLineF(
x[-2], ymn,
dsg._last_line = QLineF(
x[-uppx], 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 by_index_and_key(