font-atlas-sdf

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.

Demo

Usage

canvas = fontAtlas(options?)

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.

Related

• font-atlas − bitmap font atlas.
• tiny-sdf − fast glyph signed distance field generation.
• optical-properties − glyph optical center and bounding box calculation