Chart::Plotly::Trace::Histogram2dcontour::Contours - This attribute is one of the possible options for the trace histogram2dcontour.


version 0.041


 use HTML::Show;
 use Chart::Plotly;
 use Chart::Plotly::Trace::Histogram2dcontour;
 my $histogram2dcontour =
   Chart::Plotly::Trace::Histogram2dcontour->new( x => [ map { int( 10 * rand() ) } ( 1 .. 500 ) ],
                                                  y => [ map { int( 10 * rand() ) } ( 1 .. 500 ) ] );
 HTML::Show::show( Chart::Plotly::render_full_html( data => [$histogram2dcontour] ) );


This attribute is part of the possible options for the trace histogram2dcontour.

This file has been autogenerated from the official plotly.js source.

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Full reference:


This is an unofficial Plotly Perl module. Currently I'm not affiliated in any way with Plotly. But I think plotly.js is a great library and I want to use it with perl.



Serialize the trace to JSON. This method should be called only by JSON serializer.


  • coloring

    Determines the coloring method showing the contour values. If *fill*, coloring is done evenly between each contour level If *heatmap*, a heatmap gradient coloring is applied between each contour level. If *lines*, coloring is done on the contour lines. If *none*, no coloring is applied on this trace.

  • end

    Sets the end contour level value. Must be more than `contours.start`

  • impliedEdits

  • labelfont

  • labelformat

    Sets the contour label formatting rule using d3 formatting mini-language which is very similar to Python, see:

  • operation

    Sets the constraint operation. *=* keeps regions equal to `value` *<* and *<=* keep regions less than `value` *>* and *>=* keep regions greater than `value` *[]*, *()*, *[)*, and *(]* keep regions inside `value[0]` to `value[1]` *][*, *)(*, *](*, *)[* keep regions outside `value[0]` to value[1]` Open vs. closed intervals make no difference to constraint display, but all versions are allowed for consistency with filter transforms.

  • showlabels

    Determines whether to label the contour lines with their values.

  • showlines

    Determines whether or not the contour lines are drawn. Has an effect only if `contours.coloring` is set to *fill*.

  • size

    Sets the step between each contour level. Must be positive.

  • start

    Sets the starting contour level value. Must be less than `contours.end`

  • value

    Sets the value or values of the constraint boundary. When `operation` is set to one of the comparison values (=,<,>=,>,<=) *value* is expected to be a number. When `operation` is set to one of the interval values ([],(),[),(],][,)(,](,)[) *value* is expected to be an array of two numbers where the first is the lower bound and the second is the upper bound.


Pablo Rodríguez González <>


This software is Copyright (c) 2020 by Pablo Rodríguez González.

This is free software, licensed under:

  The MIT (X11) License