zfont

v1.2.8

Published

2 years ago

Text plugin for Zdog

Downloads

626

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jaames

zdog 3d font text truetype ttf

Features

Built on top of Typr.js, which supports a wide range of .ttf and .otf fonts with speed and grace
Less than 14kB minified and gzipped
No need to worry about waiting for fonts to load; text automatically pops into existence once the font is ready
Includes support for multiline text
Update font, text, color, alignment, etc at any time
Bonus utilities for measuring text, waiting for font load & more!

Caveats

You have to provide a .ttf to use yourself; it isn't possible to use system fonts
Character range is limited to whichever glyphs are supported by your chosen font, and font stacks/fallbacks aren't supported yet

Demo

A live demo can be found here, there's also some more in-depth examples on Codepen!

Installation

Install with NPM

$ npm install zfont --save

If you are using a module bundler like Webpack or Rollup, import Zfont into your project:

// Using ES6 module syntax
import Zfont from 'zfont';

// Using CommonJS modules
const Zfont = require('zfont');

Using the jsDelivr CDN

<script src="https://cdn.jsdelivr.net/npm/zfont/dist/zfont.min.js"></script>

When manually including the library like this, it will be globally available on window.Zfont

Download and Host Yourself

Development version Uncompressed at around 75kB, with source comments included

Production version Minified to 45kB

Then add it to the <head> of your page with a <script> tag:

<html>
  <head>
    <!-- ... -->
    <script src="./path/to/zfont.min.js"></script>
  </head>
  <!-- ... -->
</html>

Usage

Register Plugin

After both Zdog and Zfont have been imported/downloaded, we need to initialize the Zfont plugin. Once the it's initialized, the Zdog.Font, Zdog.Text and Zdog.TextGroup classes will be available:

Zfont.init(Zdog);

Hello World

(Pssst! If you prefer to dive in, check out the basic demo over on Codepen)

To draw some text in a Zdog scene, first we need to set up a new Zdog.Font object with the .ttf url for our desired font, then we can create a new Zdog.Text object and add it to the illustration like any other shape:

// Initialize Zfont
Zfont.init(Zdog);


// Create a Zdog illustration
let illo = new Zdog.Illustration({
  element: '.zdog-canvas'
});

// Set up a font to use
let myFont = new Zdog.Font({
  src: './path/to/font.ttf'
});

// Create a text object
// This is just a Zdog.Shape object with a couple of extra parameters!
new Zdog.Text({
  addTo: illo,
  font: myFont,
  value: 'Hey, Zdog!',
  fontSize: 64,
  color: '#fff'
});

// Animation loop
function animate() {
  illo.updateRenderGraph();
  requestAnimationFrame(animate);
}
animate();

Multiline Text

Both Zdog.Text and Zdog.TextGroup support multiline text, by inserting a newline character (\n) wherever you wish to add a line break:

new Zdog.Text({
  ...
  value: 'The quick brown fox\njumps over the\nlazy zdog',
});

For better readability you may prefer to use an array of strings for the value option. In this case, each string in the array will be treated as a seperate line of text:

new Zdog.Text({
  ...
  value: [
    'The quick brown fox'
    'jumps over the',
    'lazy zdog'
  ]
});

Waiting for Fonts to Load

In most cases you don't have to worry about waiting for fonts to load, as text objects will magically pop into existence once their font is ready to use. However, the plugin also provides a Zdog.waitForFonts() utility function if you need to delay anything until all the fonts in your scene have finished loading.

For example, let's modify the animation loop from the previous example so that it doesn't begin until the fonts are ready:

// Animation loop
function animate() {
  illo.updateRenderGraph();
  requestAnimationFrame(animate);
}
// Zdog.waitForFonts() returns a Promise which is resolved once all the fonts added to the scene so far have been loaded
Zdog.waitForFonts().then(() => {
  // Once the fonts are done, start the animation loop
  animate();
})

API

Zdog.Font

Represents a font that can be used by an instance of either Zdog.Text or Zdog.TextGroup.

let font = new Zdog.Font({
  src: './path/to/font.ttf'
})

Options

| Param | Details | Default | |:-----------|:--------|:--------| | src | Font URL path. This can be a .ttf or .otf font, check out the Typr.js repo for more details about font support | '' |

Methods

`measureText(text, fontSize)`

Get the measurements for the specified string text when rendered at fontSize (measured in pixels), similar to CanvasRenderingContext2D.measureText().

Returns an object with width, height, descender, ascender.

`getTextPath(text, fontSize, x=0, y=0, z=0, alignX='left', alignY='bottom')`

Returns an array of Zdog path commands for the specified string text, when rendered at fontSize (measured in pixels).

(x, y, z) is the origin point of the path
alignX is the horizontal text alignment (equivalent to the CSS text-align property); either "left", "center" or "right".
alignY is the vertical text alignment; either "top", "middle" or "bottom".

`waitForLoad()`

Returns a Promise which resolves once this font has finished loading.

Zdog.Text

An object used for rendering text. It inherits everything from the Zdog.Shape class.

new Zdog.Text({
  addTo: illo,
  font: font,
  value: 'Hey, Zdog!',
  textAlign: 'center',
  textBaseline: 'middle',
  color: '#5222ee',
  stroke: 1,
})

Options

Zdog.Text inherits all the options from the Zdog.Shape class, plus a couple of extras:

| Param | Details | Default | |:-----------|:--------|:--------| | font | Zdog.Font to use for this text. This is required. | null | | value | Text string | '' | | fontSize | Text size, measured in pixels | 64 | | textAlign| Horizontal text alignment, equivalent to the CSS text-align property. This can be either 'left', 'center' or 'right' | 'left' | | textBaseline| Vertical text alignment, equivalent to the HTML5 canvas' textBaseline property. This can be either 'top', 'middle' or 'bottom' | 'bottom' |

Properties

Zdog.Text inherits all the properties from the Zdog.Shape class, as well as some extras. All of these properties can be updated at any time and the rendered text will update automatically.

`font`

The Zdog.Font instance being used for this text.

`value`

Text value as a string.

`fontSize`

Font size, measured in pixels.

`textAlign`

Horizontal text alignment, equivalent to the CSS text-align property. This can be either 'left', 'center' or 'right'

`textBaseline`

Vertical text alignment, equivalent to the HTML5 canvas' textBaseline property. This can be either 'top', 'middle' or 'bottom'

Zdog.TextGroup

This class is very similar to Zdog.Text, except it acts as a Zdog.Group instead, and each text glyph is rendered as its own shape. This is helpful for more advanced use-cases where you need control over each character.

new Zdog.TextGroup({
  addTo: illo,
  font: font,
  value: 'Hey, Zdog!',
  textAlign: 'center',
  color: '#5222ee',
  stroke: 2,
})

Options

Zdog.TextGroup inherits all the options from the Zdog.Group class, plus a few extras:

Properties

Zdog.TextGroup inherits all the properties from the Zdog.Group class, as well as some extras. All of these properties can be updated at any time and the rendered text will update automatically.

`font`

The Zdog.Font instance being used for this text.

`value`

Text value as a string.

`fontSize`

Font size, measured in pixels.

`textAlign`

Horizontal text alignment, equivalent to the CSS text-align property. This can be either 'left', 'center' or 'right'

`textBaseline`

Vertical text alignment, equivalent to the HTML5 canvas' textBaseline property. This can be either 'top', 'middle' or 'bottom'

`color`

Text color, equivalent to Shape.color. Setting this will update the color for all of the group's children.

`fill`

Text fill, equivalent to Shape.fill. Setting this will update the fill for all of the group's children.

`stroke`

Text stroke, equivalent to Shape.stroke. Setting this will update the stroke for all of the group's children.

Zdog.waitForFonts

Returns a Promise which resolves as soon as all the fonts currently added to the scene are loaded and ready for use.

Zdog.waitForFonts().then(function() {
  // Do something once the font is ready
}

Todo

Google Fonts & Typekit integration?
Support for different text directions, e.g. right-to-left
Support for fallback fonts
Support for color (SVG) fonts

Building

Install Dependencies with NPM

$ npm install

Run Devserver

$ npm start

Build production files

$ npm run build

2019 James Daniel

Published

Vulnerabilities

Links

Maintainers

Keywords

Readme

Features

Caveats

Demo

Installation

Install with NPM

Using the jsDelivr CDN

Download and Host Yourself

Usage

Register Plugin

Hello World

Multiline Text

Waiting for Fonts to Load

API

Zdog.Font

Options

Methods

measureText(text, fontSize)

getTextPath(text, fontSize, x=0, y=0, z=0, alignX='left', alignY='bottom')

waitForLoad()

Zdog.Text

Options

Properties

font

value

fontSize

textAlign

textBaseline

Zdog.TextGroup

Options

Properties

font

value

fontSize

textAlign

textBaseline

color

fill

stroke

Zdog.waitForFonts

Todo

Building

Install Dependencies with NPM

Run Devserver

Build production files

`measureText(text, fontSize)`

`getTextPath(text, fontSize, x=0, y=0, z=0, alignX='left', alignY='bottom')`

`waitForLoad()`

`font`

`value`

`fontSize`

`textAlign`

`textBaseline`

`font`

`value`

`fontSize`

`textAlign`

`textBaseline`

`color`

`fill`

`stroke`