geometr (version 0.2.10)

gt_skew: Skew geometric objects

Description

Skew geometric objects by a shear factor in x and y dimension.

Usage

gt_skew(obj, x = NULL, y = NULL, fid = NULL, update = TRUE)

Arguments

obj

[geometric object(1)] the object to skew.

x

[numeric(1)] the shear factor in x dimension.

y

[numeric(1)] the shear factor in y dimension.

fid

[integerish(.)] in case only a subset of features shall be skewed, specify that here.

update

[logical(1)] whether or not to update the window slot after skewing.

Value

geom of the skewed obj.

See Also

Other geometry tools: gt_filter(), gt_locate(), gt_pull(), gt_reflect(), gt_rotate(), gt_scale(), gt_stretch(), gt_translate()

Examples

# NOT RUN {
# skew several features
visualise(gtGeoms$polygon, linewidth = 3)
newPoly <- gt_skew(obj = gtGeoms$polygon, x = 0.5, update = FALSE)
visualise(geom = newPoly, linecol = "green", new = FALSE)

# skew a single feature
visualise(gtGeoms$polygon, linewidth = 3)
newPoly <- gt_skew(obj = gtGeoms$polygon, x = 0.5, y = .7, fid = 2,
                   update = FALSE)
visualise(newPoly, linecol = "green", new = FALSE)
# }