- Simple pointer example
- A linked streams example demonstrating how us a PointerXY stream to reveal more information about coordinate.
- streams, linked, pointer, interactive
import numpy as np import holoviews as hv from holoviews import streams hv.extension('bokeh')
Y,X=(np.mgrid[0:100, 0:100]-50.)/20. img = hv.Image(np.sin(X**2+Y**2)) # Declare pointer stream initializing at (0, 0) and linking to Image pointer = streams.PointerXY(x=0, y=0, source=img) # Define function to draw cross-hair and report value of image at location as text def cross_hair_info(x, y): text = hv.Text(x+0.05, y, '%.3f'% img[x,y], halign='left', valign='bottom') return hv.HLine(y) * hv.VLine(x) * text # Overlay image and cross_hair_info img * hv.DynamicMap(cross_hair_info, streams=[pointer])
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