PictureImage-class: Class '"PictureImage"'

In grImport2: Importing 'SVG' Graphics

Class "PictureImage"

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.

grImport2 documentation built on Sept. 11, 2024, 5:19 p.m.