theme_legend: Override theme parameters for legend attributes
In rbokeh: R Interface for Bokeh

Override theme parameters for legend attributes

theme_legend(
  fig,
  background_fill_alpha = 0.95,
  background_fill_color = "#fff",
  border_line_alpha = 0.5,
  border_line_cap = "butt",
  border_line_color = "black",
  border_line_dash = NULL,
  border_line_dash_offset = 0,
  border_line_join = "miter",
  border_line_width = 1,
  glyph_height = 20,
  glyph_width = 20,
  label_height = 20,
  label_standoff = 15,
  label_text_align = "left",
  label_text_alpha = 1,
  label_text_baseline = "bottom",
  label_text_color = "#444444",
  label_text_font = "Helvetica",
  label_text_font_size = "12pt",
  label_text_font_style = "normal",
  label_width = 50,
  legend_padding = 10,
  legend_spacing = 3,
  pars = NULL
)

`fig`	figure to modify
`background_fill_alpha`	(numeric) background color alpha of plot
`background_fill_color`	(color) background color of plot
`border_line_alpha`	The line alpha for the legend border outline.
`border_line_cap`	('butt', 'round', 'square') The line cap for the legend border outline.
`border_line_color`	The line color for the legend border outline.
`border_line_dash`	The line dash for the legend border outline.
`border_line_dash_offset`	The line dash offset for the legend border outline.
`border_line_join`	('miter', 'round', 'bevel') The line join for the legend border outline.
`border_line_width`	The line width for the legend border outline.
`glyph_height`	The height (in pixels) that the rendered legend glyph should occupy.
`glyph_width`	The width (in pixels) that the rendered legend glyph should occupy.
`label_height`	The height (in pixels) of the area that legend labels should occupy.
`label_standoff`	The distance (in pixels) to separate the label from its associated glyph.
`label_text_align`	('left', 'right', 'center') The text align for the legend labels.
`label_text_alpha`	The text alpha for the legend labels.
`label_text_baseline`	('top', 'middle', 'bottom', 'alphabetic', 'hanging') The text baseline for the legend labels.
`label_text_color`	The text color for the legend labels.
`label_text_font`	The text font for the legend labels.
`label_text_font_size`	The text font size for the legend labels.
`label_text_font_style`	('normal', 'italic', 'bold') The text font style for the legend labels.
`label_width`	The width (in pixels) of the area that legend labels should occupy.
`legend_padding`	Amount of padding around the legend.
`legend_spacing`	Amount of spacing between legend entries.
`pars`	optionally specify a named list of all parameters - useful when dealing with theme lists

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figure(legend_location = "top_left") %>%
  ly_points(1:10, legend = "a") %>%
  theme_legend(border_line_width = 2)

Warning messages:
1: In structure(x, class = unique(c("AsIs", oldClass(x)))) :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
2: In structure(x, class = unique(c("AsIs", oldClass(x)))) :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
3: In structure(x, class = unique(c("AsIs", oldClass(x)))) :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
4: In structure(x, class = unique(c("AsIs", oldClass(x)))) :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
5: In structure(x, class = unique(c("AsIs", oldClass(x)))) :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
6: In structure(x, class = unique(c("AsIs", oldClass(x)))) :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
7: In structure(x, class = unique(c("AsIs", oldClass(x)))) :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
8: In structure(x, class = unique(c("AsIs", oldClass(x)))) :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.