Support hover_cols with rasterize #1206
Comments
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@ahuang11 I created the issue here |
ahuang11
changed the title
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Hi @balshersingh10, @Hoxbro kindly worked out a solution you can find below. It leverages the new In general it's important to think about the displayed data when rasterizing a dataset. For color mapping, each pixel is an aggregation of the data points it contains, the default is a count, in your example as you set import datashader as ds
import holoviews as hv
import hvplot.pandas
import numpy as np
import pandas as pd
import panel as pn
from bokeh.models import HoverTool, CustomJSHover
from holoviews.operation.datashader import rasterize
# Create a dummy DataFrame
np.random.seed(0)
n = 10000 # number of points
df = pd.DataFrame(
{
"Longitude": np.random.uniform(-180, 180, n),
"Latitude": np.random.uniform(-90, 90, n),
"Timestamp": pd.date_range(start="2023-01-01", periods=n, freq="D"),
"Value": np.random.rand(n) * 100, # This will represent 'selected_col'
}
)
selected_col = "Value"
tile = hv.element.tiles.EsriNatGeo().opts(width=1000, height=650)
_hover_code = """
const projections = Bokeh.require("core/util/projections");
const {snap_x, snap_y} = special_vars
const coords = projections.wgs84_mercator.invert(snap_x, snap_y)
return "" + (coords[%d]).toFixed(4)
"""
_date_hover_code = """
let d = new Date(0)
d.setUTCSeconds(Math.floor(value / 1e9))
return d.toDateString()
"""
hover = HoverTool(
tooltips=[
("Timestamp", "@Timestamp{custom}"),
("(Longitude,Latitude)", "$x{custom}, $y{custom}"),
(selected_col, f"@image{{0.0}}"),
],
formatters={
"$x": CustomJSHover(code=_hover_code % 0),
"$y": CustomJSHover(code=_hover_code % 1),
"@Timestamp": CustomJSHover(code=_date_hover_code),
},
)
plot = df.hvplot.points("Longitude", "Latitude", hover_cols=['Value'], geo=True)
rplot = rasterize(plot, aggregator=ds.mean('Value'), selector=ds.max("Value"), dynamic=False).opts(
tools=[hover], cmap="Reds", colorbar=True
)
tile * rplot
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maximlt
changed the title
ALL software version info
Details
Description of expected behavior and the observed behavior
When hover tooltip is enabled, Timestamp not working. I discussed this issue in discourse, Andrew helped me to fix some things, still Timestamp is not working.
https://discourse.holoviz.org/t/how-to-set-up-hovertool-for-multiple-columns-with-hvplot/4294/16?u=balsher.singh
Complete, minimal, self-contained example code that reproduces the issue
Stack traceback and/or browser JavaScript console output
Screenshots or screencasts of the bug in action
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