dev.capabilities {grDevices}R Documentation

Query Capabilities of the Current Graphics Device

Description

Query the capabilities of the current graphics device.

Usage

dev.capabilities(what = NULL)

Arguments

what

a character vector partially matching the names of the components listed in section ‘Value’, or NULL which lists all available capabilities.

Details

The capabilities have to be specified by the author of the graphics device, unless they can be deduced from missing hooks. Thus they will often by returned as NA, and may reflect the maximal capabilities of the underlying device where several output formats are supported by one device.

Most recent devices support semi-transparent colours provided the graphics format does (which PostScript does not). On the other hand, relatively few graphics formats support (fully or semi-) transparent backgrounds: generally the latter is found only in PDF and PNG plots.

Value

A named list with some or all of the following components, any of which may take value NA:

semiTransparency

logical: Does the device support semi-transparent colours?

transparentBackground

character: Does the device support (semi)-transparent backgrounds? Possible values are "no", "fully" (only full transparency) and "semi" (semi-transparent background colours are supported).

rasterImage

character: To what extent does the device support raster images as used by rasterImage and grid.raster? Possible values "no", "yes" and "non-missing" (support only for arrays without any missing values).

capture

logical: Does the current device support raster capture as used by grid.cap?

locator

logical: Does the current device support locator and identify?

events

character: Which events can be generated on this device? Currently this will be a subset of c("MouseDown", "MouseMove", "MouseUp", "Keybd", "Idle"), but other events may be supported in the future.

patterns

character: Does the device support pattern fills? One or more of c("LinearGradient", "RadialGradient", "TilingPattern") May also be FALSE.

clippingPaths

logical: Does the device support clipping paths?

masks

character: Does the device support masks? One or more of c("alpha", "luminance") May also be FALSE.

compositing

character: Does the device support compositing operators? There are many possible operators and devices may support any subset. For example the pdf device supports a set of “blend modes” whereas Cairo-based devices support Porter-Duff operators as well. May also be FALSE.

transformations

logical: Does the devices support affine transformations ?

paths

logical: Does the device support stroking and filling paths?

glyphs

logical: Does the device support rendering glyphs?

See Also

See getGraphicsEvent for details on interactive events.

Examples

dev.capabilities()
[Package grDevices version 4.6.0 Index]