Skew geometries in x and y

Shears each geometry by degrees_x along the x dimension and degrees_y along the y dimension, about the geometry's own centroid. The geometry type of the output matches the geometry type of the input.

Usage

ga_skew_xy(geometry, degrees_x, degrees_y)

Arguments

geometry

a GeoArrow point, linestring, multilinestring, polygon, or multipolygon array

degrees_x

shear angle along the x dimension; length 1 or the same length as geometry

degrees_y

shear angle along the y dimension; length 1 or the same length as geometry

Value

a GeoArrow array of the same geometry type as the input

References

Skew

See also

Other affine: ga_affine_transform(), ga_rotate_around_center(), ga_rotate_around_centroid(), ga_scale_xy(), ga_skew(), ga_translate()

Examples

sq <- geoarrow::as_geoarrow_array(sf::st_sfc(
  sf::st_polygon(list(rbind(c(0, 0), c(2, 0), c(2, 2), c(0, 2), c(0, 0))))
))

# shear along x only, leaving y untouched
geoarrow::as_geoarrow_vctr(ga_skew_xy(sq, 30, 0))
#> <geoarrow_vctr geoarrow.polygon{list}[1]>
#> [1] <POLYGON ((-0.5773503 0, 1.4226497 0, 2.5773503 2, 0.5773503 2, -0.5773>