mapgl (version 0.2.1)

interpolate: Create an interpolation expression

Description

This function generates an interpolation expression that can be used to style your data.

Usage

interpolate(
  column = NULL,
  property = NULL,
  type = "linear",
  values,
  stops,
  na_color = NULL
)

Value

A list representing the interpolation expression.

Arguments

column

The name of the column to use for the interpolation. If specified, property should be NULL.

property

The name of the property to use for the interpolation. If specified, column should be NULL.

type

The interpolation type. Can be one of "linear", list("exponential", base) where base specifies the rate at which the output increases, or list("cubic-bezier", x1, y1, x2, y2) where you define a cubic bezier curve with control points.

values

A numeric vector of values at which stops occur.

stops

A vector of corresponding stops (colors, sizes, etc.) for the interpolation.

na_color

The color to use for missing values. Mapbox GL JS defaults to black if this is not supplied.

Examples

interpolate(
    column = "estimate",
    type = "linear",
    values = c(1000, 200000),
    stops = c("#eff3ff", "#08519c")
)