Display a lineplot that lets user's draw data: Server version

Upon completion of line draw, returns a reactive variable that contains a vector of the y coordinates of what the user has drawn. This also includes the start point specified with `draw_start` This is the server component of shinydrawr. You never directly use this function but instead call it through the shiny function `callModule()`. See the example for how to do this.

shinydrawr(input, output, session, data, x_col, y_col = NULL,
  free_draw = FALSE, draw_start = NULL, title = NULL,
  pin_start = TRUE, x_range = NULL, y_range = NULL, x_lab = NULL,
  y_lab = NULL, line_style = NULL, drawn_line_color = "orangered",
  data_line_color = "steelblue", x_axis_buffer = 0.02,
  y_axis_buffer = 0.1)

Arguments

input

you can ignore these as it is taken care of by shiny::callModule()
output

you can ignore these as it is taken care of by shiny::callModule()
session

you can ignore these as it is taken care of by shiny::callModule()
data

Tibble to draw
x_col

Name of column for x axis
y_col

Name of column for y axis
free_draw

Do you just want the user to draw data on a supplied x-range? I.e. no revealed line?
draw_start

Where on the x axis to start obscuring data for drawing? Defaults to very start of data.
title

Text for title, if desired.
pin_start

Pin start of drawn line to end of shown data? Defaults to TRUE.
x_range

Two element array of min and max of x range. Otherwise defaults to min and max of data.
y_range

Two element array of min and max of y range. Otherwise defaults to min and max of data.
x_lab

Text to label x axis, defaults to name of column used for x-axis
y_lab

Text to label y axis, defaults to name of column, or in free-draw case, to just 'y'.
line_style

List containing any styling that is desired for the default line. For options see MDN: SVG line. Make sure to camelCase all attributes.
drawn_line_color

CSS valid color for user-drawn line. Defaults to "orangered".
data_line_color

CSS valid color for data line. Defaults to "steelblue".
x_axis_buffer

Scaler for how much to pad ends of x axis if not specifying range directly. Defaults to 2% (0.02).
y_axis_buffer

Scaler for how much to pad ends of y axis if not specifying range directly. Defaults to 10% (0.1).

See also

shinydrawr_UI, drawr

Examples

if (FALSE) {
callModule(
  shinydrawr,
  'drawr_widget',
  data,
  x_col = time,
  y_col = metric,
  draw_start = 20
)
}