Adapt heatmap layer to be used with a colormap control #1036
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HaudinFlorence
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Looks like you should rebase (79e7d94 is already in master).
ipyleaflet/leaflet.py
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| colors = ['blue', 'cyan', 'lime', 'yellow', 'red'] | ||
| values = [0.4, 0.6, 0.7, 0.8, 1.0] |
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You might want to use traits for these, otherwise they are not configurable.
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Thanks a lot for the review @davidbrochart. Logics of the attributes has been changed a little bit in 93fa3c4, but the choice of the values and colors are configurable using gradient, as shown in the the example notebook Heatmap_with_colormap.
ipyleaflet/leaflet.py
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| dict = {} | ||
| for i in range(len(values)): | ||
| dict[values[i]] = colors[i] | ||
| vmin = values[0] | ||
| vmax = values[len(values) - 1] | ||
| gradient = Dict(dict).tag(sync=True, o=True) | ||
| colormap = LinearColormap(colors, vmin=vmin, vmax=vmax) |
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vmin, vmax, gradient and colormap should be computed when values or colors change.
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This has been tried in commit 93fa3c4.
…vmax and colormap from gradient data (values and colors).
HaudinFlorence
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This has been fixed. |
ipyleaflet/leaflet.py
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| colors = list(self.gradient.values()) | ||
| self.vmin = values[0] | ||
| self.vmax = values[len(values) - 1] | ||
| self.colormap = LinearColormap(colors, vmin=self.vmin, vmax=self.vmax) |
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With the way gradient is defined, is it really a linear color map?
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Thanks for this question. There was an argument missing to properly set a piecewise linear colormap as shown on this picture for a gradient set to {0.1 :'orange', 0.2: 'red', 1.0: 'black'}
Update docstrings Co-authored-by: David Brochart <david.brochart@gmail.com>
Co-authored-by: David Brochart <david.brochart@gmail.com>
…ar colormap with custom boundary colors and values.
ipyleaflet/leaflet.py
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| self.vmin = values[0] | ||
| self.vmax = values[-1] |
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I think we need to sort the gradient by value first.
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Sorry. I am not sure to understand.
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gradient is a dict of "value:color" entries. I don't think we can expect the first entry to have the minimum value and the last entry to have the maximum value.
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Thanks for pointing this out. The name values was indeed not a good choice, since it actually refers to the key of the gradient dict. New naming colormap_labels is proposed in 27acdac
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I meant that we need to sort the colormap_labels. What happens to vmin and vmax if gradient = {1.0: 'red', 0.6: 'cyan', 0.7: 'lime', 0.8: 'yellow', 0.4: 'blue'}?
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I meant that we need to sort the
colormap_labels. What happens tovminandvmaxifgradient = {1.0: 'red', 0.6: 'cyan', 0.7: 'lime', 0.8: 'yellow', 0.4: 'blue'}?
You're right. Branca colormap requires that the colormaps_labels are sorted. This point has been solved in commit 373f5d9
The example notebook has also been modified for a case where the gradient is initially not sorted.
Co-authored-by: David Brochart <david.brochart@gmail.com>
Adapt heatmap layer for an easier use with a colormap control. The colormap is defined from the color gradient defined in Heatmap class
.