Populate a <canvas> element with a font texture atlas – can be used to quickly generate SDF (Signed Distance Field) fonts. SDF is the most efficient way to draw text in WebGL, see article. For bitmap fonts see font-atlas.
Populates and returns a <canvas> element with a font texture atlas. Takes
the following options:
| Property | Default | Meaning |
|---|---|---|
canvas |
New canvas | use an existing <canvas> element. |
font |
16px sans-serif |
the font family to use when drawing the text. Can be a css font string or an object with font properties: size, family, style, weight, variant, stretch. |
shape |
[512, 512] |
an array containing the [width, height] for the canvas in pixels. |
step |
[32, 32] |
an array containing the [width, height] for each cell in pixels. |
chars |
[32, 126] |
may be one of either: a string containing all of the characters to use; an array of all the characters to use; an array specifying the [start, end] character codes to use. |
radius |
size × 1.5 | affects the "slope" of distance-transform. |
align |
'optical' |
align symbol vertically by bounding box rather than font baseline. Available values: 'optical' for center of mass alignment (see optical-properties), 'bounds' for bounding box alignment or false to use font alignment. |
fit |
0.5 |
normalize glyph sizes to cover same part of size. Can be a number or bool, eg. 0.5 covers half of size, 1 fits to the full size and false disables fit. |
- font-atlas − bitmap font atlas.
- tiny-sdf − fast glyph signed distance field generation.
- optical-properties − glyph optical center and bounding box calculation