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Cartogram htmlwidget for visualizing geographical data by distorting a TopoJson topology

topogRam.Rd

Continuous area cartograms with d3.js and cartogram-chart.

Usage

topogram(
  sfobj,
  value,
  label = "{value}",
  palette = "viridis",
  rescale_to = c(1, 1000),
  n_iteration = 10,
  projection = "geoMercator",
  layerId = NULL,
  width = NULL,
  height = NULL,
  elementId = NULL
)

Arguments

sfobj

An sf object. For the time being, shape must be projected in Mercator (CRS 4326).

value

Variable name to use to distort topology.

label

glue string to be used in tooltip, you can use HTML tags in it.

palette

Name of a color palette, such as "viridis", "Blues", ... Or a function to map data values to colors, see scales::col_numeric().

rescale_to

Rescale value to distort topology to a specified range, use NULL to use values as is.

n_iteration

Number of iterations to run the algorithm for. Higher numbers distorts the areas closer to their associated value, at the cost of performance.

projection

Name of a projection, see available ones here: https://github.com/d3/d3-geo-projection.

layerId

A formula, the layer id to specify value returned by input$<ID>_click in 'shiny' application.

width

A numeric input in pixels.

height

A numeric input in pixels.

elementId

Use an explicit element ID for the widget.

Value

A topogram()htmlwidget object.