Draw Rotated Rectangles on an Image

drawRotatedRectangle draws rotated rectangles over an Image object. This operation is destructive: it changes irreversibly the Image object and cannot be undone.

Usage

drawRotatedRectangle(
  image,
  x,
  y,
  axis1,
  axis2,
  angle,
  color = "red",
  thickness = 1
)

Arguments

image

An Image object.

x

A numeric value or vector representing the x coordinates of the center of each rectangle.

y

A numeric value or vector representing the y coordinates of the center of each rectangle.

axis1

A numeric value or vector representing the length of the first axis of each rectangle.

axis2

A numeric value or vector representing the length of the second axis of each rectangle.

angle

A numeric value or vector representing the angle in degrees between axis1 and the horizontal.

color

A value or vector of any kind of R color specification compatible with col2bgr representing the color of each rectangle's outline (default: "red").

thickness

A numeric value or vector representing the thickness in pixels of each rectangle's outline (default: 1). If negative, then a filled rectangle is drawn.

Value

This function does not return anything. It modifies image in place.

See also

Image, drawRectangle, drawEllipse

Author

Simon Garnier, garnier@njit.edu

Examples

balloon <- image(system.file("sample_img/balloon1.png", package = "Rvision"))
drawRotatedRectangle(balloon, 290, 170, 440, 325, 60, thickness = 3)
#> NULL