README
¶
✍ Bitmap font loader library for Go.
This library loads font data from an image ("bitmap").
It gets loaded into a Go map which means a Glyph can be retrieved with font[glyph], for example font["A"].
Example
bm := bitmap.New()
font := bm.Load("font.png")
x := 0
y := 0
xx := x
yy := y
ch := font[glyph]
for i := 0; i < ch.Height; i++ {
bin := ch.Data[i] // Gets a line: a glyph is 8x8
binarr := strings.Split(bin, "")
for _, pix := range binarr {
if pix == "1" { draw(xx, yy) }
xx += 1
}
yy += 1
xx = x
}
Used by
This library is used in Pinwheel for its pixel font.
If you also use this for reason, you can make a PR to add your use here.
License
Documentation
¶
Overview ¶
The bitmap package loads a bitmap font from an image using a descriptor file.
A bitmap font is a font with glyphs that is literally bitmapped, with a transparent pixel being `0`, and any opaque pixel being `1`.
A descriptor file describes the size (width, height) of each glyph. It is a JSON file, the same name as the font itself. An example: the font is `fnt.png`, the descriptor will be `fnt.json`, and would look like: ` [
{
"Char": " ",
"Width": 7,
"X": 1,
"Y": 8,
"W": 2,
"H": 0,
"Ox": 0,
"Oy": 0
},
{
"Char": "!",
"Width": 5,
"X": 4,
"Y": 1,
"W": 3,
"H": 7,
"Ox": 0,
"Oy": 7
},
...
`
Index ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type BitmapFont ¶
type BitmapFont struct {
// contains filtered or unexported fields
}
BitmapFont holds a slice of Glyphs.
Source Files