Package Exports

@mapbox/tiny-sdf

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Readme

TinySDF

TinySDF is a tiny and fast JavaScript library for generating SDF (signed distance field) from system fonts on the browser using Canvas 2D and Felzenszwalb/Huttenlocher distance transform. This is very useful for rendering text with WebGL.

Demo: http://mapbox.github.io/tiny-sdf/

Usage

Create a TinySDF for drawing SDFs based on font parameters:

var fontsize = 24; // Pixel font size
var buffer = 3;    // Pixel whitespace buffer around glyph
var radius = 8;    // Lower = "sharper", higher = "fuzzier"
var cutoff = 0.25  // Across the board alpha channel reduction
                   // Reduces low-alpha pixels to zero, "thins" SDF overall

var fontFamily = 'sans-serif'; // css font-family
var fontWeight = 'normal';     // css font-weight
var tinySDFGenerator = new TinySDF(fontsize,
                                   buffer,
                                   radius,
                                   cutoff,
                                   fontFamily,
                                   fontWeight);

var oneSDF = tinySDFGenerator.draw('泽');