This function sets a variety of options for brushing (i.e., highlighting)
multiple plots. These options are primarily designed for linking
multiple plotly graphs, and may not behave as expected when linking
plotly to another htmlwidget package via crosstalk. In some cases,
other htmlwidgets will respect these options, such as persistent selection
in leaflet (see demo("highlight-leaflet", package = "plotly")).
highlight(
p,
on = "plotly_click",
off,
persistent = getOption("persistent", FALSE),
dynamic = FALSE,
color = NULL,
selectize = FALSE,
defaultValues = NULL,
opacityDim = getOption("opacityDim", 0.2),
selected = attrs_selected(),
debounce = 0,
...
)a plotly visualization.
turn on a selection on which event(s)? To disable on events
altogether, use NULL. Currently the following are supported:
'plotly_click'
'plotly_hover'
'plotly_selected': triggered through rectangular
(layout.dragmode = 'select') or lasso (layout.dragmode = 'lasso') brush.
turn off a selection on which event(s)? To disable off
events altogether, use NULL. Currently the following are supported:
'plotly_doubleclick': triggered on a double mouse click while
(layout.dragmode = 'zoom') or (layout.dragmode = 'pan')
'plotly_deselect': triggered on a double mouse click while
(layout.dragmode = 'select') or (layout.dragmode = 'lasso')
'plotly_relayout': triggered whenever axes are rescaled
(i.e., clicking the home button in the modebar) or whenever the height/width
of the plot changes.
should selections persist (i.e., accumulate)? We often
refer to the default (FALSE) as a 'transient' selection mode;
which is recommended, because one may switch from 'transient' to
'persistent' selection by holding the shift key.
should a widget for changing selection colors be included?
character string of color(s) to use for
highlighting selections. See toRGB() for valid color
specifications. If NULL (the default), the color of selected marks
are not altered.
whether or not to render a selectize.js widget for selecting
highlight_key() values. A list of additional selectize.js options may
also be provided. The label used for this widget should be set via the
groupName argument of highlight_key().
a vector of values for setting a "default selection". These values should match the key attribute.
a number between 0 and 1 used to reduce the opacity of non-selected traces (by multiplying with the existing opacity).
attributes of the selection, see attrs_selected().
amount of time to wait before firing an event (in milliseconds).
The default of 0 means do not debounce at all.
Debouncing is mainly useful when on = "plotly_hover" to avoid firing too many events
when users clickly move the mouse over relevant graphical marks.
currently not supported.
if (FALSE) { # interactive()
# These examples are designed to show you how to highlight/brush a *single*
# view. For examples of multiple linked views, see `demo(package = "plotly")`
d <- highlight_key(txhousing, ~city)
p <- ggplot(d, aes(date, median, group = city)) + geom_line()
gg <- ggplotly(p, tooltip = "city")
highlight(gg, dynamic = TRUE)
# supply custom colors to the brush
cols <- toRGB(RColorBrewer::brewer.pal(3, "Dark2"), 0.5)
highlight(gg, on = "plotly_hover", color = cols, dynamic = TRUE)
# Use attrs_selected() for complete control over the selection appearance
# note any relevant colors you specify here should override the color argument
s <- attrs_selected(
showlegend = TRUE,
mode = "lines+markers",
marker = list(symbol = "x")
)
highlight(layout(gg, showlegend = TRUE), selected = s)
}