Draw Lines on an Image

drawLine draws lines over an Image object. This operation is destructive: it changes irreversibly the Image object and cannot be undone.

Usage

drawLine(image, pt1_x, pt1_y, pt2_x, pt2_y, color = "red", thickness = 1)

Arguments

image

An Image object.

pt1_x

A numeric value or vector representing the x coordinates of the first end of each line.

pt1_y

A numeric value or vector representing the y coordinates of the first end of each line.

pt2_x

A numeric value or vector representing the x coordinates of the second end of each line.

pt2_y

A numeric value or vector representing the y coordinates of the second end of each line.

color

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

thickness

A numeric value or vector representing the thickness in pixels of each line (default: 1).

Value

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

See also

Image, drawArrow

Author

Simon Garnier, garnier@njit.edu

Examples

balloon <- image(system.file("sample_img/balloon1.png", package = "Rvision"))
drawLine(balloon, 1, 1, ncol(balloon), nrow(balloon), thickness = 3)