devNew
Opens a new device
Opens a new device.
Usage
devNew(type=getOption("device"), ..., scale=1, aspectRatio=1, par=NULL, label=NULL)Arguments
- type
- A
characterstring specifying the type of device to be opened. This string should match the name of an existing devicefunction. - ...
- Additional arguments passed to the device
function, e.g.widthandheight. If not given, the are inferred fromdevOptions - scale
- A
numericscalar factor specifying how much the width and the height should be rescaled. - aspectRatio
- A
numericratio specifying the aspect ratio of the image. See below. - par
- An optional named
listof graphical settings applied, that is, passed topar, immediately after opening the device. - label
- An optional
characterstring specifying the label of the opened device.
Value
- Returns what the device
functionreturns.
Width and heights
The default width and height of the generated image is specific to
the type of device used. There is not straightforward programatical
way to infer these defaults; here we use devOptions(), which
in most cases returns the correct defaults.
Aspect ratio
The aspect ratio of an image is the height relative to the width.
If argument height is not given (or NULL), it is
calculated as aspectRatio*width as long as they are given.
Likewise, if argument width is not given (or NULL), it is
calculated as width/aspectRatio as long as they are given.
If neither width nor height is given, then width
defaults to devOptions(type)$width.
If both width and height are given, then
aspectRatio is ignored.
See Also
devDone() and devOff().
For simplified generation of image files, see devEval().