Rvision (version 0.3.5)

drawEllipse: Draw Ellipses on an Image

Description

drawEllipse draws ellipses (or part of) over an Image object. This operation is destructive: it changes irreversibly the Image object and cannot be undone.

Usage

drawEllipse(image, x, y, axis1, axis2, angle, start_angle = 0,
  end_angle = 360, color = "red", thickness = 1)

Arguments

image

An Image object.

x

A numeric value or vector representing the x coordinates of the centers of each ellipse

y

A numeric value or vector representing the y coordinates of the centers of each ellipse

axis1

A numeric value or vector representing the half-length of the first axis of each ellipse.

axis2

A numeric value or vector representing the half-length of the second axis of each ellipse.

angle

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

start_angle

A numeric value or vector representing the start angle in degrees of each elliptic arc (default: 0).

end_angle

A numeric value or vector representing the end angle in degrees of each elliptic arc (default: 360).

color

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

thickness

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

Value

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

See Also

Image, drawCircle

Examples

# NOT RUN {
# TODO
# }