Add new landmarks based on angular positions

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