A TypeScript fork of Trianglify without Canvas support. Generates colorful triangle meshes that can be used as SVG images and CSS backgrounds.
npm install trianglify-ts-no-canvas> Note: This is a TypeScript fork of Trianglify with Canvas support removed. Node.js 24 currently does not support Canvas, and for my personal use cases, Canvas functionality was not required. This fork maintains all SVG generation capabilities while providing full TypeScript support.
Trianglify is a library that I wrote to generate nice SVG background images like this one:
You can grab Trianglify with npm/yarn (recommended):
``
npm install --save trianglify
Include it in your application via the unpkg CDN:
`
Or download a .zip from the releases page.
Browsers
`html`
Node
`js
const trianglify = require('trianglify')
const fs = require('fs')
// Note: Canvas support has been removed in this fork
// Use SVG output instead:
const pattern = trianglify({
width: 1920,
height: 1080
})
const svg = pattern.toSVG()
fs.writeFileSync('trianglify.svg', svg.toString())
`
You can see the examples/ folder for more usage examples.
The https://trianglify.io/ GUI is a good place to play around with the various configuration parameters and see their effect on the generated output, live.
The source code of Trianglify is licensed under version 3 of the GNU General Public License (GPLv3). This means that any websites, apps, or other projects that include the Trianglify javascript library need to be released under a compatible open-source license. If you are interested in using Trianglify in a closed-source project, please email qr@qrohlf.com to purchase a commercial license.
However, it's worth noting that you own the copyright to the output image files which you create using Trianglify, just like you own the copyright to an image created using something like GIMP. If you just want to use an image file that was generated using Trianglify in your project, and do not plan to distribute the Trianglify source code or compiled versions of it, you do not need to worry about the license restrictions described above.
Trianglify is primarily used by calling the trianglify function, which returns a trianglify.Pattern object.
`jsimport trianglify from 'trianglify'
// load the library, either via a window global (browsers) or require call (node)
// in es-module environments, you can as well
const trianglify = window.trianglify || require('trianglify')
const options = { height: 400, width: 600 }
const pattern = trianglify(options)
console.log(pattern instanceof trianglify.Pattern) // true
`
This object holds the generated geometry and colors, and exposes a number of methods for rendering this geometry to the DOM or a Canvas.
pattern.opts
Object containing the options used to generate the pattern.
pattern.points
The pseudo-random point grid used for the pattern geometry, in the following format:
`js`
[
[x, y],
[x, y],
[x, y],
// and so on...
]
pattern.polys
The array of colored polygons that make up the pattern, in the following format:
`js
// {x, y} center of the first polygon in the pattern
pattern.polys[0].centroid
// [i, i, i] three indexes into the pattern.points array,
// defining the shape corners
pattern.polys[0].vertexIndices
// Chroma.js color object defining the color of the polygon
pattern.polys[0].color
`
pattern.toSVG(destSVG?, svgOpts?)
Rendering function for SVG. In browser or browser-like (e.g. JSDOM) environments, this will return a SVGElement DOM node. In node environments, this will return a lightweight node tree structure that can be serialized to a valid SVG string using the toString() function.
If an existing svg element is passed as the destSVG, this function will render the pattern to the pre-existing element instead of creating a new one.
The svgOpts option allows for some svg-specific customizations to the output:
`js`
const svgOpts = {
// Include or exclude the xmlns='http://www.w3.org/2000/svg' attribute on
// the root
pattern.toSVGTree(svgOpts?)
Alternate rendering function for SVG. Returns a lightweight node tree structure that can be seralized to a valid SVG string using the toString() function. In node environments, this is an alias forpattern.toSVG().
pattern.toCanvas() - REMOVED
> Note: Canvas support has been removed in this TypeScript fork. Please use pattern.toSVG() for all rendering needs. The SVG output can be converted to other formats using external tools if needed.
Trianglify is configured by an options object passed in as the only argument. The following option keys are supported, see below for a complete description of what each option does.
`js`
const defaultOptions = {
width: 600,
height: 400,
cellSize: 75,
variance: 0.75,
seed: null,
xColors: 'random',
yColors: 'match',
fill: true,
palette: trianglify.colorbrewer,
colorSpace: 'lab',
colorFunction: trianglify.colorFunctions.interpolateLinear(0.5),
strokeWidth: 0,
points: null
}
width
Integer, defaults to 600. Specify the width in pixels of the pattern to generate.
height
Integer, defaults to 400. Specify the height in pixels of the pattern to generate.
cellSize
Integer, defaults to 75. Specify the size in pixels of the mesh used to generate triangles. Larger values will result in coarser patterns, smaller values will result in finer patterns. Note that very small values may dramatically increase the runtime of Trianglify.
variance
Decimal value between 0 and 1 (inclusive), defaults to 0.75. Specify the amount of randomness used when generating triangles. You may set this higher than 1, but doing so may result in patterns that include "gaps" at the edges.
seed
String, defaults to null. Seeds the random number generator to create repeatable patterns. When set to null, the RNG will be seeded with random values from the environment. An example usage would be passing in blog post titles as the seed to generate unique but consistient trianglify patterns for every post on a blog site.
xColors
False, string, or array of CSS-formatted colors, default is 'random'. Specify the color gradient used on the x axis.
Valid string values are 'random', or the name of a colorbrewer palette (i.e. 'YlGnBu' or 'RdBu'). When set to 'random', a gradient will be randomly selected from the colorbrewer library.
Valid array values should specify the color stops in any CSS format (i.e. ['#000000', '#4CAFE8', '#FFFFFF']).
yColors
False, string or array of CSS-formatted colors, default is 'match'. When set to 'match' the x-axis color gradient will be used on both axes. Otherwise, accepts the same options as xColors.
palette
The array of color combinations to pick from when using random for the xColors or yColors. See src/utils/colorbrewer.js for the format of this data.
colorSpace
String, defaults to 'lab'. Set the color space used for generating gradients. Supported values are rgb, hsv, hsl, hsi, lab and hcl. See this blog post for some background on why this matters.
colorFunction
Specify a custom function for coloring triangles, defaults to null. Accepts a function to override the standard gradient coloring, which is passed a variety of data about the pattern and each polygon and must return a Chroma.js color object.
See examples/color-function-example.html and src/utils/colorFunctions.js for more information about the built-in color functions, and how to write custom color functions.
fill
Boolean, defaults to true. Specifies whether the polygons generated by Trianglify should be filled in.
strokeWidth
Number, defaults to 0. Specify the width of the strokes used to outline the polygons. This can be used in conjunction with fill: false to generate weblike patterns.
points
Array of points ([x, y]) to triangulate, defaults to null. When not specified an array randomised points is generated filling the space. Points must be within the coordinate space defined by width and height. See examples/custom-points-example.html` for a demonstration of how this option can be used to generate circular trianglify patterns.