add_contour_layer {deckgl}R Documentation

Add a contour layer to the deckgl widget

Description

The ContourLayer renders contour lines for a given threshold and cell size. Internally it implements Marching Squares algorithm to generate contour line segments and feeds them into LineLayer to render lines.

Usage

add_contour_layer(deckgl, id = "contour-layer", data = NULL,
  properties = list(), ...)

Arguments

deckgl

A deckgl widget object.

id

The unique id of the layer.

data

The url to fetch data from or a data object.

properties

A named list of properties with names corresponding to the properties defined in the deckgl-api-reference for the given layer class.

...

More properties that will be added to the properties object. This can be useful if you want to use a properties object for more than one layer.

See Also

https://deck.gl/#/documentation/deckgl-api-reference/layers/contour-layer

Examples

## @knitr contour-layer
data("sf_bike_parking")

contours <- list(
  use_contour_definition(
    threshold = 1,
    color = c(255, 0, 0),
    stroke_width = 2
  ),
  use_contour_definition(
    threshold = 5,
    color = c(0, 255, 0),
    stroke_width = 3
  ),
  use_contour_definition(
    threshold = 15,
    color = c(0, 0, 255),
    stroke_width = 5
  )
)

properties <- list(
  contours = contours,
  cellSize = 200,
  elevationScale = 4,
  getPosition = ~lng + lat
)

deck <- deckgl(zoom = 10.5, pitch = 30) %>%
  add_contour_layer(data = sf_bike_parking, properties = properties) %>%
  add_control("Contour Layer") %>%
  add_basemap()

if (interactive()) deck

[Package deckgl version 0.2.7 Index]