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Plotly: Enable specified contour values for ranges; warn otherwise

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Plotly does not support arbitrary contour values, but can plot
specific contours if they are an equally-spaced range.  This
commit implements the plotting of contours if the `levels`
keyword argument is passed an `AbstractRange`, or if a set
of arbitrary values are passed.  In the latter case, however,
since this is not supported by Plotly, a range based on the
first and last values of the collection passed in is created
and used to define the contours.  A warning is then issued to
the user.

Otherwise, any other types are assumed to be number-like and
adjusted as previously.  Note that Plotly does not guarantee
the exact number of contours will be used.

This partly addresses #3356.

See https://github.com/plotly/plotly.js/issues/4503 (Plotly issue
tracking the ability to set arbitrary contours).
This commit is contained in:
Andy Nowacki 2021-08-19 15:22:02 +01:00
parent 214663aa4b
commit 79ce34a712
1 changed files with 24 additions and 1 deletions
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25
src/backends/plotly.jl
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@ -617,11 +617,34 @@ function plotly_series(plt::Plot, series::Series)
filled = isfilledcontour(series)
plotattributes_out[:type] = "contour"
plotattributes_out[:x], plotattributes_out[:y], plotattributes_out[:z] = x, y, z
plotattributes_out[:ncontours] = series[:levels] + 2
plotattributes_out[:contours] = KW(
:coloring => filled ? "fill" : "lines",
:showlabels => series[:contour_labels] == true,
)
# Plotly does not support arbitrary sets of contours:
# https://github.com/plotly/plotly.js/issues/4503
let levels = series[:levels]
if levels isa AbstractRange
plotattributes_out[:contours][:start] = first(levels)
plotattributes_out[:contours][:end] = last(levels)
plotattributes_out[:contours][:size] = step(levels)
elseif levels isa AVec
levels_range =
range(first(levels), stop = last(levels), length = length(levels))
plotattributes_out[:contours][:start] = first(levels_range)
plotattributes_out[:contours][:end] = last(levels_range)
plotattributes_out[:contours][:size] = step(levels_range)
@warn(
"setting arbitrary contour levels with Plotly backend is not supported; " *
"use a range to set equally-spaced contours or an integer to set the " *
"approximate number of contours with the keyword `levels`. " *
"Using levels $(levels_range)"
)
elseif isinteger(levels)
# Assume this is a number of levels
plotattributes_out[:ncontours] = levels + 2
end
end
plotattributes_out[:colorscale] =
plotly_colorscale(series[:linecolor], series[:linealpha])
plotattributes_out[:showscale] = hascolorbar(sp) && hascolorbar(series)