bdftools
bdftools provides some tools for reading, manipulating and outputting BDF bitmap fonts.
ToDo
- Todo: print header info when printing font
- Number of characters, width, height, bbox etc
What’s in the box
read_bdf(filename)reads a BDF pixel font file into an R representation i.e. an object of classbdfprint.bdf()prints meta information and a font sample.bdf_create_df(bdf, text)Create a data.frame of points for the given stringbdf_create_mat(bdf, text)Create a matrix representation for the given stringbdfGrob(bdf, text, ...)create a simple grob representation of the given string using squares for pixelsgeom_text_bdf()renders text in a bitmap font - simlar interface toggplot2::geom_text()as.data.frame.bdf(bdf)converts the fullbdffont into a rectangular data.frame of all characters and their (x, y) coordinates.read_bdf_builtin()to read in a font included with this package:
You can install from GitHub with:
# install.package('remotes')
remotes::install_github('coolbutuseless/bdftools')Example: Loading and displaying a BDF bitmap font.
library(grid)
library(ggplot2)
library(bdftools)
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Load a BDF font
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fontfile <- system.file("spleen-5x8.bdf", package = "bdftools", mustWork = TRUE)
myfont <- read_bdf(fontfile)
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# By default, printing a font will print some header info, and a text
# sample rendered in that font in the console
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
myfontsize=8, bbox=5, pixel_size=8, font_descent=0, font_ascent=-1, default_char=8, line_height=1, bitmap=7, size=32, bbox=8, pixel_size=
# #
# # # #
# # ## ### ### ### # ## # # ### ###
#### # # # # # # # # # # # # # # #
# # ### # # # # # # # # # # # #### ##
# # # # # # # # ## # # # ## # #
# # ### # # ### # ## ## ## ### ###
### #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Generate some sample text in the console
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bdf_print_sample(myfont, "Hello RStats", wrap = FALSE) # # # #
# # # # ### ### # #
# # ### # # ## # # # ### ## ### ###
#### # # # # # # # # ## # # # #
# # #### # # # # ### # # ### # ##
# # # # # # # # # # # # # # #
# # ### ## ## ## # # ### ## ### ## ### #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Generate a graphics grob and draw it
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
grob <- bdfGrob(myfont, "Hello\nRStats", size = 10, shrink = 0.8, fill = 'lightblue', col = 'blue')
grid.newpage(); grid.draw(grob)
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# View the entire font as a data.frame of coordiantes
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
as.data.frame(myfont)# A tibble: 2,385 x 10
encoding desc dwidth x y size pixel_size font_ascent font_descent
* <int> <chr> <int> <dbl> <dbl> <int> <int> <int> <int>
1 32 SPACE 5 NA NA 8 8 7 1
2 33 EXCLAM… 5 3 7 8 8 7 1
3 33 EXCLAM… 5 3 6 8 8 7 1
4 33 EXCLAM… 5 3 5 8 8 7 1
5 33 EXCLAM… 5 3 4 8 8 7 1
6 33 EXCLAM… 5 3 3 8 8 7 1
7 33 EXCLAM… 5 3 1 8 8 7 1
8 34 QUOTAT… 5 4 7 8 8 7 1
9 34 QUOTAT… 5 2 7 8 8 7 1
10 34 QUOTAT… 5 4 6 8 8 7 1
# … with 2,375 more rows, and 1 more variable: line_height <int>#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# View the coordinates of a string rendered in this font
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bdf_create_df(myfont, "abc")# A tibble: 34 x 3
x y idx
<dbl> <dbl> <int>
1 3 5 1
2 2 5 1
3 4 4 1
4 4 3 1
5 3 3 1
6 2 3 1
7 4 2 1
8 1 2 1
9 4 1 1
10 3 1 1
# … with 24 more rows#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# View the coordinates of a string rendered in this font
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bdf_create_mat(myfont, "abc") [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13] [,14]
[1,] 0 0 0 0 0 1 0 0 0 0 0 0 0 0
[2,] 0 0 0 0 0 1 0 0 0 0 0 0 0 0
[3,] 0 1 1 0 0 1 1 1 0 0 0 1 1 1
[4,] 0 0 0 1 0 1 0 0 1 0 1 0 0 0
[5,] 0 1 1 1 0 1 0 0 1 0 1 0 0 0
[6,] 1 0 0 1 0 1 0 0 1 0 1 0 0 0
[7,] 0 1 1 1 0 1 1 1 0 0 0 1 1 1An example of a larger font
myfont <- bdftools::read_bdf_builtin("spleen-16x32.bdf")
bdf_print_sample(myfont, "Frak") ########## ##
########### ##
### ##
## ##
## ##
## ##
## ########## ######### ## ##
## ########### ########## ## ###
## ### ## ### ## ###
######### ## ## ## ## ###
######### ## ## ## ###
## ## ########## #####
## ## ########### #####
## ## ### ## ## ###
## ## ## ## ## ###
## ## ## ## ## ###
## ## ## ## ## ###
## ## ### ## ## ###
## ## ########### ## ###
## ## ########## ## ##ggplot2 example with geom_text_bdf()
geom_text_bdf() works very similar to geom_text() but text is rendered from
a bitmap font as a collection of large square pixels. Key things to note:
- Can set both an outline
colourand afill shrinkargument determines the size of the square pixel.shrink = 1is the default.shrink = 0.9will make the square pixels smaller and not touching each other.
library(ggplot2)
library(bdftools)
fontfile <- system.file("spleen-5x8.bdf", package = "bdftools", mustWork = TRUE)
plot_df <- head(mtcars)
plot_df$car <- rownames(plot_df)
plot_df$cyl <- as.factor(plot_df$cyl)
ggplot(plot_df, aes(mpg, wt)) +
geom_point(col = 'red') +
geom_text_bdf(
aes(mpg, wt, label=car, fill = cyl),
col = NA,
linewidth = 0.5,
bdf_filename = fontfile,
shrink = 1,
size = 9,
hjust = -0.1
) +
theme_bw() +
scale_fill_brewer(palette = 'Dark2') +
labs(title = "geom_text_bdf() - bitmap font rendering in ggplot2")
Font sample sheet
An example of how the data.frame representation of the font can be plotted
in ggplot2.
library(ggplot2)
library(bdftools)
myfont <- read_bdf_builtin("cozette.bdf")
plot_df <- as.data.frame(myfont)
plot_df <- plot_df[plot_df$encoding >= 65 & plot_df$encoding <= 124,]
ggplot(plot_df) +
geom_tile(aes(x, y), width=0.9, height = 0.9, na.rm = TRUE) +
facet_wrap(~encoding + desc, ncol = 12)+
theme_void(10) +
coord_equal()
Package Header
How the header for this page was created.
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Choose some fonts
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
font1 <- bdftools::read_bdf_builtin("spleen-16x32.bdf")
font2 <- bdftools::read_bdf_builtin("spleen-5x8.bdf")
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Main header
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
txt1 <- bdfGrob(
font1, "bdftools",
lwd = 0.5,
fill = '#3D428B',
col = 'darkblue',
size = 8,
shrink = 0.8
)
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Subtitle
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
txt2 <- bdfGrob(
font2, "bitmap fonts in R",
lwd = 0.5,
col = 'darkblue',
size = 11,
shrink = 0.8,
fill = viridisLite::inferno(151),
y = unit(0.5, 'npc') - unit(50, 'mm')
)
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Plot it
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
grid.newpage();
grid.draw(txt1)
grid.draw(txt2)
BDF Bitmap Font Resources
- Fonts
- Tom Thumb tiny font (License: Dual licensed CC0 or CC-BY 3.0 license.)
- github repo of lots of fonts (License: Various/unknown)
- unifont a BDF font with glyphs
for every printable codepoint from
U+0000toU+FFFF. (License: Dual licensed SIL Open Font License (OFL) version 1.1 and the GNU GPL 2+ with the GNU font embedding exception) - X11 fonts (License: Public Domain)
- BDF Font Specification