Drop old `pyqtgraph` downsample code

big_data_lines
Tyler Goodlet 2022-04-03 23:35:32 -04:00
parent 62d08eaf85
commit cdc882657a
1 changed files with 0 additions and 47 deletions

View File

@ -106,53 +106,6 @@ def trace_hl(
return out
def downsample(
x: np.ndarray,
y: np.ndarray,
bins: int = 2,
method: str = 'peak',
**kwargs,
) -> 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()`` which gets
all credit, though we will likely drop this in favor of the M4
algo below.
'''
# py3.10 syntax
match method:
case 'peak':
if bins < 2:
log.warning('No downsampling taking place?')
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
case 'm4':
return ds_m4(x, y, kwargs['px_width'])
def ohlc_flatten(
ohlc: np.ndarray,
use_mxmn: bool = True,