Convert an extracted glyph raster to a grob — glyph_raster

This is a convenience function that helps in creating rasterGrob with the correct settings for the glyph. It takes inot account the sizing and offset returned by glyph_raster() and allows you to only consider the baseline position of the glyph.

Usage

glyph_raster_grob(glyph, x, y, ..., default.units = "bigpts")

Arguments

glyph

The nativeRaster object returned as one of the elements by glyph_raster()

x, y

The baseline location of the glyph

...

Arguments passed on to grid::rasterGrob

image: Any R object that can be coerced to a raster object.
width: A numeric vector or unit object specifying width.
height: A numeric vector or unit object specifying height.
just: The justification of the rectangle relative to its (x, y) location. If there are two values, the first value specifies horizontal justification and the second value specifies vertical justification. Possible string values are: "left", "right", "centre", "center", "bottom", and "top". For numeric values, 0 means left alignment and 1 means right alignment.
hjust: A numeric vector specifying horizontal justification. If specified, overrides the just setting.
vjust: A numeric vector specifying vertical justification. If specified, overrides the just setting.
name: A character identifier.
gp: An object of class "gpar", typically the output from a call to the function gpar. This is basically a list of graphical parameter settings.
vp: A Grid viewport object (or NULL).
interpolate: A logical value indicating whether to linearly interpolate the image (the alternative is to use nearest-neighbour interpolation, which gives a more blocky result).

default.units

A string indicating the default units to use if x, y, width, or height are only given as numeric vectors.

Value

A rasterGrob object

Examples

font <- font_info()
glyph <- glyph_info("R", path = font$path, index = font$index)

R <- glyph_raster(glyph$index, font$path, font$index, size = 150)

grob <- glyph_raster_grob(R[[1]], 50, 50)

grid::grid.newpage()
# Mark the baseline location
grid::grid.points(50, 50, default.units = "bigpts")
# Draw the glyph
grid::grid.draw(grob)