Rvision (version 0.3.5)

drawArrow: Draw Arrows on an Image

Description

drawArrow draws arrow segments from the first point to the second over an Image object. This operation is destructive: it changes irreversibly the Image object and cannot be undone.

Usage

drawArrow(image, pt1_x, pt1_y, pt2_x, pt2_y, tip_length = 0.1,
  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 arrow.

pt1_y

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

pt2_x

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

pt2_y

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

tip_length

A numeric value or vector representing the length of each arrow's tip as a fraction of each arrow's length (default: 0.1).

color

A value or vector of any kind of R color specification compatible with col2rgb representing the color of each arrow (default: "red").

thickness

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

Value

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

See Also

Image, drawLine

Examples

# NOT RUN {
# TODO
# }