def_ldk_angle: Add new landmarks based on angular positions

In vbonhomme/Momocs: Morphometrics using R

Add new landmarks based on angular positions

Description

A wrapper on coo_intersect_angle and coo_intersect_direction for Out and Opn objects.

Usage

def_ldk_angle(coo, angle)

def_ldk_direction(coo, direction = c("down", "left", "up", "right")[4])

## Default S3 method:
def_ldk_direction(coo, direction = c("down", "left", "up", "right")[4])

## S3 method for class 'Out'
def_ldk_direction(coo, direction = c("down", "left", "up", "right")[4])

## S3 method for class 'Opn'
def_ldk_direction(coo, direction = c("down", "left", "up", "right")[4])

Arguments

coo	a Out or Opn object
angle	numeric an angle in radians (0 by default).
direction	character one of "down", "left", "up", "right" ("right" by default)

Value

a Momocs object of same class

Note

any existing ldk will be preserved.

See Also

Typically used before coo_slice and coo_slide. See def_ldk_tips as well.

Examples

# adds a new landmark towards south east
hearts %>%
   slice(1:5) %>% # for speed purpose only
   def_ldk_angle(-pi/6) %>%
stack()

# on Out and towards NW and NE here
olea %>%
   slice(1:5) %>% #for speed purpose only
   def_ldk_angle(3*pi/4) %>%
   def_ldk_angle(pi/4) %>%
   stack

vbonhomme/Momocs documentation built on Nov. 13, 2023, 8:54 p.m.