poly_apex_base_angle {pliman}

Calculate the apex and base angles of an object

Description

This function calculates the apex and base angles of an object. It takes as input a matrix of coordinates and returns the apex angle, base angle, and the coordinates of the apex and base as a list. The angles are computed after the object is aligned in the vertical axis with poly_align().

Usage

poly_apex_base_angle(
  x,
  percentiles = c(0.25, 0.75),
  invert = FALSE,
  plot = TRUE
)

Arguments

x

A matrix of coordinates representing the contour of the object, often obtained with object_contour().

percentiles

A numeric vector of two percentiles between 0 and 1 indicating the height of the points from the top to the bottom. The function calculates the apex angle between the two percentiles and the base angle between the lowest point and the highest point.

invert

If TRUE, aligns the object along the horizontal axis.

plot

Plots the polygon with the points? Defaults to TRUE.

Value

A list containing the apex angle, base angle, apex coordinates, and base coordinates.

Examples

library(pliman)
# a matrix of coordinates
angls <- poly_apex_base_angle(contours[[2]])
angls

# or a list of coordinates
poly_apex_base_angle(contours)