Fonts
lbutils.graphics.fonts
Fonts for the LED and OLED displays; especially the those using the 'pmod'
packages. These fonts are based on open-source font files, and converted with
the fontconvert
utility
written by Daniel Perron.S.
Most of the work of this library consists of rebuilding the font representation as
described below. This reconstruction is undertaken by the BaseFont
class, and abstract class which must
be sub-classed for a specific font. Currently the fonts (and subclasses) exposed
in this library are
Font06
. 6x6 pixel sans-serif font.Font08
. 8x8 pixel sans-serif font.Org01
. A tiny, stylized font with all characters within a 6 pixel height. Created by fontconvert, from the Org_v01 by Orgdot.
All fonts are provided in a single package,
lbutils.graphics.fonts
, with most of the functionality
implemented by the the BaseFont
class. Together the
BaseFont
class and
the classes above providing specific fonts are organised as follows
Rebuilding the Fonts
Rebuilding the fonts requires the fontconvert
utility to be built in C with [the FreeType library] (https://freetype.org).
Once built the fonts can be converted using fontconvert
as
./fontconvert ~/Library/Fonts/FreeSans.ttf 18 > FreeSans18pt7b.py
Currently the fontconvert
utility only extracts the printable 7-bit ASCII
characters of a font: for the exact character set extracted see the resulting
Python file.
Tested Implementations
- Raspberry Pi Pico W (MicroPython 3.4)
- CPython (3.10)
lbutils.graphics.fonts.BaseFont
A Base Class which implements the access methods required to use the
individual font representations of the sub-classes. Those sub-classes
provide only the bitmap representation of the font: the reconstruction of
that bitmap is handled here by BaseFont
.
Methods
-
get_bit()
. Returns the state ('0' or '1') of the bit specified by the current cursorposition
within the current glyph bitmap. -
get_next()
. Return the state of the current bit within the bitmap being displayed, and then advance the internal cursor to the next position: ready for the next call. -
set_position()
. Set the internal state to draw the glyph of the character in the next natural position.
Source code in lbutils/graphics/fonts/base_font.py
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__init__
__init__(
bitmap: bytes, index: dict[str, int], glyph: list
) -> None
Take the byte array of bitmap
s with the index
of font characters
and use these together with the glyph
list to reconstruct the required
font. This method is typically called by a sub-class in the constructor
of the sub-class as in.
def __init__(self):
super().__init__(self.bitmap, self.index, self.glyph)
Parameters:
-
bitmap
(
bytes
) –Calculated bit representations of glyph fragments. Used in reconstructing the specified glyphs.
-
index
(
dict[str, int]
) –Cross-references the UTF-8 characters to the list of glyphs specified in
glyph
. This provides the main mapping for character values to glyphs. -
glyph
(
list
) –Specifies the bitmap sequence used to reconstruct a specific glyph. This provides the main definition of the core glphys from the original font definition.
Source code in lbutils/graphics/fonts/base_font.py
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get_bit
get_bit(position: int) -> int
Return the state ('0' or '1') of the bit specified by the current
cursor position
within the current glyph bitmap.
Parameters:
-
position
(
int
) –The position within the glyph bitmap to test for state
Returns:
-
int
–Either '
0
' or '1
' depending on the bitmap value of the current cursor position within the glyph.
Source code in lbutils/graphics/fonts/base_font.py
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get_next
get_next() -> int
Return the state of the current bit within the bitmap being displayed, and then advance the internal cursor to the next position: ready for the next call.
Returns:
-
int
–Either '
0
' or '1
' depending on the bitmap value of the current cursor position within the glyph.
Source code in lbutils/graphics/fonts/base_font.py
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set_position
set_position(utf8_char: str) -> None
Set the internal state to draw the glyph of the character given in
utf8_char
. This internal state is not exposed to the calling method or
function: but will be used in subsequent calls to
get_bit
or
get_next
.
Parameters:
-
utf8_char
(
str
) –A single character string holding the character that will be drawn next from the internal glyph representation.
Source code in lbutils/graphics/fonts/base_font.py
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lbutils.graphics.fonts.font06
Font06
Bases: BaseFont
6x6 pixel sans-serif font, created by
fontconvert
.
Source code in lbutils/graphics/fonts/font06.py
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lbutils.graphics.fonts.font08
Font08
Bases: BaseFont
8x8 pixel sans-serif font, created by
fontconvert
.
Source code in lbutils/graphics/fonts/font08.py
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lbutils.graphics.fonts.org_01
Org01
Bases: BaseFont
A tiny, stylized font with all characters within a 6 pixel height.
Created by fontconvert
, from the Org_v01
by Orgdot.
Source code in lbutils/graphics/fonts/org_01.py
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