lawn_transform_rotate: Rotate a GeoJSON feature

In ropensci/lawn: Client for 'Turfjs' for 'Geospatial' Analysis

Rotate a GeoJSON feature

Description

Rotates any geojson Feature or Geometry of a specified angle, around its centroid or a given pivot point

Usage

lawn_transform_rotate(x, angle, pivot = c(0, 0), mutate = FALSE, lint = FALSE)

Arguments

x	a feature
angle	(integer/numeric) number of rotation (along the vertical axis), from North in decimal degrees, negative clockwise
pivot	(integer/numeric) point around which the rotation will be performed (optional, default centroid)
mutate	(logical) allows GeoJSON input to be mutated (significant performance increase if true) (optional). Default: FALSE
lint	(logical) Lint or not. Uses geojsonhint. Takes up increasing time as the object to get linted increases in size, so probably use by default for small objects, but not for large if you know they are good geojson objects. Default: FALSE

Value

a rotated data-Feature

Note

all rotations follow the right-hand rule

Examples

x <- '{
 "type": "Feature",
 "properties": {},
 "geometry": {
   "type": "Polygon",
   "coordinates": [
    [
      [ 0, 29 ], [ 3.5, 29 ], [ 2.5, 32 ], [ 0, 29 ]
    ]
  ]
 }
}'
lawn_transform_rotate(x, angle = 100, pivot = c(15, 15))

lawn_transform_rotate(x, angle = 100)
lawn_transform_rotate(x, angle = 100, mutate = TRUE)

## Not run: 
view(lawn_featurecollection(x))
view(lawn_featurecollection(lawn_transform_rotate(x, angle = 100)))
view(lawn_featurecollection(
  lawn_transform_rotate(x, angle = 100, pivot = c(15, 15))
))
view(lawn_featurecollection(
  lawn_transform_rotate(x, angle = 150, pivot = c(15, 15))
))
view(lawn_featurecollection(
  lawn_transform_rotate(x, angle = 300, pivot = c(0, 4))
))

## End(Not run)

ropensci/lawn documentation built on May 18, 2022, 9:58 a.m.