Create an interpolation expression — interpolate • mapgl

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
)

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.

Value

A list representing the interpolation expression.

Examples

interpolate(
    column = "estimate",
    type = "linear",
    values = c(1000, 200000),
    stops = c("#eff3ff", "#08519c")
)
#> [[1]]
#> [1] "interpolate"
#> 
#> [[2]]
#> [[2]][[1]]
#> [1] "linear"
#> 
#> 
#> [[3]]
#> [[3]][[1]]
#> [1] "get"
#> 
#> [[3]][[2]]
#> [1] "estimate"
#> 
#> 
#> [[4]]
#> [1] 1000
#> 
#> [[5]]
#> [1] "#eff3ff"
#> 
#> [[6]]
#> [1] 2e+05
#> 
#> [[7]]
#> [1] "#08519c"
#>