Description

A description of a raster image.

Slots

x:

Object of class "numeric". A vector of length one representing the x-location of the top-left corner of the image.

y:

Object of class "numeric". A vector of length one representing the y-location of the top-left corner of the image.

width:

Object of class "numeric". A vector of length one representing the width of the image.

height:

Object of class "numeric". A vector of length one representing the height of the image.

image:

Object of class "nativeRaster". A description of the raster image as an array of integers representing pixel colours. Not intended to be created directly, but as a result of calling the jpeg and png packages read*() functions.

angle:

Object of class "numeric". A vector of length one representing the angle applied to the image. Corresponds to grid's viewport angles.

maskRef:

Object of class "ANY". A character reference to an object that will mask this image. Not intended to be used directly (so can be NULL.

bbox:

Object of class "numeric". Represented as [xmin, xmax, ymin, ymax]. The bounding box of the image. Used for features such as clipping.

Extends

Class PictureContent, directly.

Methods

applyTransform

signature(object = "PictureImage", tm = "matrix"): transforms each location described by the image by a 3x3 transformation matrix and returns a new "PictureImage" object with the newly transformed locations.

grobify

signature(object = "PictureImage"): converts the image description into a grid raster grob that represents the image. Typically used in conjunction with a pattern.

While not intended to be used directly, this function contains a single optional argument, ext, which is a character vector. See grid.picture for more information on what this extension selection parameter means, in addition to the valid values this argument takes.

Author(s)

Simon Potter

See Also

PictureRect.