coo_scale: Scales coordinates

In Momocs: Morphometrics using R

Scales coordinates

Description

coo_scale scales the coordinates by a 'scale' factor. If not provided, assumed to be the centroid size. It involves three steps: centering from current position, dividing coordinates by 'scale', pushing back to the original position. coo_scalex applies a scaling (or shrinking) parallel to the x-axis, coo_scaley does the same for the y axis.

Usage

coo_scale(coo, scale)

## Default S3 method:
coo_scale(coo, scale = coo_centsize(coo))

## S3 method for class 'Coo'
coo_scale(coo, scale)

coo_scalex(coo, scale = 1)

## Default S3 method:
coo_scalex(coo, scale = 1)

## S3 method for class 'Coo'
coo_scalex(coo, scale = 1)

coo_scaley(coo, scale = 1)

## Default S3 method:
coo_scaley(coo, scale = 1)

## S3 method for class 'Coo'
coo_scaley(coo, scale = 1)

Arguments

coo	matrix of ⁠(x; y)⁠ coordinates or any Coo object.
scale	the scaling factor, by default, the centroid size for coo_scale; 1 for scalex and scaley.

Value

a single shape or a Coo object

See Also

Other coo_ utilities: coo_aligncalliper(), coo_alignminradius(), coo_alignxax(), coo_align(), coo_baseline(), coo_bookstein(), coo_boundingbox(), coo_calliper(), coo_centdist(), coo_center(), coo_centpos(), coo_close(), coo_down(), coo_dxy(), coo_extract(), coo_flipx(), coo_force2close(), coo_interpolate(), coo_is_closed(), coo_jitter(), coo_left(), coo_likely_clockwise(), coo_nb(), coo_perim(), coo_range(), coo_rev(), coo_right(), coo_rotatecenter(), coo_rotate(), coo_sample_prop(), coo_samplerr(), coo_sample(), coo_shearx(), coo_slice(), coo_slidedirection(), coo_slidegap(), coo_slide(), coo_smoothcurve(), coo_smooth(), coo_template(), coo_trans(), coo_trimbottom(), coo_trimtop(), coo_trim(), coo_untiltx(), coo_up(), is_equallyspacedradii()

Other scaling functions: coo_template()

Examples

# on a single shape
b <- bot[1] %>% coo_center %>% coo_scale
coo_plot(b, lwd=2)
coo_draw(coo_scalex(b, 1.5), bor="blue")
coo_draw(coo_scaley(b, 0.5), bor="red")

# this also works on Coo objects:
b <- slice(bot, 5) # for speed sake
stack(b)
b %>% coo_center %>% coo_scale %>% stack
b %>% coo_center %>% coo_scaley(0.5) %>% stack
#equivalent to:
#b %>% coo_center %>% coo_scalex(2) %>% stack

Momocs documentation built on Nov. 13, 2023, 5:07 p.m.