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<!DOCTYPE html>
<html>
<head>
<title>opentype.js – JavaScript parser/writer for OpenType and TrueType fonts.</title>
<meta name="description" content="A JavaScript library to manipulate the letterforms of text from the browser or node.js.">
<meta charset="utf-8">
<!-- Note that the internal development server rewrites the JavaScript URL below to build/opentype.js -->
<script type="text/javascript" src="opentype.js"></script>
<link rel="stylesheet" href="site.css">
</head>
<body>
<div class="header">
<div class="container">
<h1>opentype.js</h1>
<nav>
<a href="index.html">Home</a>
<a href="font-inspector.html">Font Inspector</a>
<a href="glyph-inspector.html">Glyph Inspector</a>
</nav>
<nav class="right">
<a class="github" href="https://github.com/opentypejs/opentype.js">Fork me on GitHub</a>
</nav>
</div>
</div>
<div class="container">
<div class="explain">
opentype.js is an OpenType and TrueType font parser and writer.
It allows you to access the <strong>letterforms</strong> of text from the browser or node.js.
</div>
<input id="file" type="file">
<span class="info" id="font-name">Fira Sans</span>
<canvas id="preview" width="940" height="300" class="text"></canvas>
<div id="message"></div>
<input type="text" class="text-input" onkeyup="renderText()" value="Hello, World!"
autofocus id="textField">
<label>Font Size<input type="range" min="6" max="500" step="2" value="150" id="font-size-range" autocomplete="off"><span id="fontSize">150</span></label>
<label><input type="checkbox" onchange="drawPointsChanged(this)" checked="checked">Draw Points</label>
<label><input type="checkbox" onchange="drawMetricsChanged(this)">Draw Metrics</label>
<label><input type="checkbox" onchange="kerningChanged(this)" checked="checked">Kerning</label>
<label><input type="checkbox" onchange="ligaturesChanged(this)" checked="checked">Ligatures</label>
<label id="hinting-label" class="disabled"><input id="hinting-checkbox" type="checkbox" onchange="hintingChanged(this)" disabled="true">Hinting</label>
<hr>
<div class="explain">
Once you have the shapes, you can modify them, for example by <strong>snapping</strong> them to a virtual grid:
</div>
<canvas id="snap" width="940" height="300" class="text"></canvas>
<label>Strength <input type="range" min="0" max="100" value="80" oninput="snapStrengthChanged(this)"/><span id="snapStrength">80</span></label>
<label>Distance<input type="range" min="1" max="100" value="53" oninput="snapDistanceChanged(this)"/><span id="snapDistance">53</span></label>
<label>X<input type="range" min="-100" max="100" value="0" oninput="snapXChanged(this)"/><span id="snapX">0</span></label>
<label>Y<input type="range" min="-100" max="100" value="0" oninput="snapYChanged(this)"/><span id="snapY">0</span></label>
<hr>
<div class="explain">
<h1>Glyphs</h1>
opentype.js provides you with <strong>raw access</strong> to the glyphs so you can modify them as you please.
</div>
<div id="glyphs">
</div>
<div class="message">Only the first 100 glyphs are shown.</div>
<hr>
<div class="explain">
<h1>Free Software</h1>
<p>opentype.js is available on <a href="https://github.com/opentypejs/opentype.js">GitHub</a> under the <a href="https://raw.github.com/opentypejs/opentype.js/master/LICENSE">MIT License</a>.</p>
<p>Copyright © 2020 Frederik De Bleser.</p>
</div>
<hr>
</div>
<script type="text/javascript">
var font = null;
var fontSize = 150;
var textToRender = "Hello, World!";
var drawPoints = true;
var drawMetrics = false;
var kerning = true;
var ligatures = true;
var hinting = false;
var previewPath = null;
var snapPath = null;
var snapStrength = 80;
var snapDistance = 53;
var snapX = 0;
var snapY = 0;
var fontSizeSlider = document.getElementById("font-size-range");
var hintingCheckbox = document.getElementById("hinting-checkbox");
var hintingLabel = document.getElementById("hinting-label");
function drawPointsChanged(e) {
drawPoints = e.checked;
renderText();
}
function drawMetricsChanged(e) {
drawMetrics = e.checked;
renderText();
}
function kerningChanged(e) {
kerning = e.checked;
renderText();
}
function ligaturesChanged(e) {
ligatures = e.checked;
renderText();
}
function hintingChanged(e) {
hinting = e.checked;
renderText();
}
function fontSizeChanged() {
fontSize = parseInt(fontSizeSlider.value, 10);
document.getElementById('fontSize').innerHTML = '' + fontSize;
renderText();
}
function snapStrengthChanged(e) {
snapStrength = e.value;
document.getElementById('snapStrength').innerHTML = '' + snapStrength;
renderText();
}
function snapDistanceChanged(e) {
snapDistance = e.value;
document.getElementById('snapDistance').innerHTML = '' + snapDistance;
renderText();
}
function snapXChanged(e) {
snapX = e.value * 1.0;
document.getElementById('snapX').innerHTML = '' + snapX;
renderText();
}
function snapYChanged(e) {
snapY = e.value * 1.0;
document.getElementById('snapY').innerHTML = '' + snapY;
renderText();
}
// Round a value to the nearest "step".
function snap(v, distance, strength) {
return (v * (1.0 - strength)) + (strength * Math.round(v / distance) * distance);
}
function doSnap(path) {
var i;
var strength = snapStrength / 100.0;
for (i = 0; i < path.commands.length; i++) {
var cmd = path.commands[i];
if (cmd.type !== 'Z') {
cmd.x = snap(cmd.x + snapX, snapDistance, strength) - snapX;
cmd.y = snap(cmd.y + snapY, snapDistance, strength) - snapY;
}
if (cmd.type === 'Q' || cmd.type === 'C') {
cmd.x1 = snap(cmd.x1 + snapX, snapDistance, strength) - snapX;
cmd.y1 = snap(cmd.y1 + snapY, snapDistance, strength) - snapY;
}
if (cmd.type === 'C') {
cmd.x2 = snap(cmd.x2 + snapX, snapDistance, strength) - snapX;
cmd.y2 = snap(cmd.y2 + snapY, snapDistance, strength) - snapY;
}
}
}
function renderText() {
if (!font) return;
textToRender = document.getElementById('textField').value;
var previewCtx = document.getElementById('preview').getContext('2d');
var options = {
kerning: kerning,
hinting: hinting,
features: {
liga: ligatures,
rlig: ligatures
}
};
previewCtx.clearRect(0, 0, 940, 300);
font.draw(previewCtx, textToRender, 0, 200, fontSize, options);
if (drawPoints) {
font.drawPoints(previewCtx, textToRender, 0, 200, fontSize, options);
}
if (drawMetrics) {
font.drawMetrics(previewCtx, textToRender, 0, 200, fontSize, options);
}
snapPath = font.getPath(textToRender, 0, 200, fontSize, options);
doSnap(snapPath);
var snapCtx = document.getElementById('snap').getContext('2d');
snapCtx.clearRect(0, 0, 940, 300);
snapPath.draw(snapCtx);
}
function enableHighDPICanvas(canvas) {
if (typeof canvas === 'string') {
canvas = document.getElementById(canvas);
}
var pixelRatio = window.devicePixelRatio || 1;
if (pixelRatio === 1) return;
var oldWidth = canvas.width;
var oldHeight = canvas.height;
canvas.width = oldWidth * pixelRatio;
canvas.height = oldHeight * pixelRatio;
canvas.style.width = oldWidth + 'px';
canvas.style.height = oldHeight + 'px';
canvas.getContext('2d').scale(pixelRatio, pixelRatio);
}
// Create a canvas and adds it to the document.
// Returns the 2d drawing context.
function createGlyphCanvas(glyph, size) {
var canvasId, html, glyphsDiv, wrap, canvas, ctx, pixelRatio;
canvasId = 'c' + glyph.index;
html = '<div class="wrapper" style="width:' + size + 'px"><canvas id="' + canvasId + '" width="' + size + '" height="' + size + '"></canvas><span>' + glyph.index + '</span></div>';
glyphsDiv = document.getElementById('glyphs');
wrap = document.createElement('div');
wrap.innerHTML = html;
glyphsDiv.appendChild(wrap);
canvas = document.getElementById(canvasId);
ctx = canvas.getContext('2d');
enableHighDPICanvas(canvas, ctx);
return ctx;
}
function showErrorMessage(message) {
var el = document.getElementById('message');
if (!message || message.trim().length === 0) {
el.style.display = 'none';
} else {
el.style.display = 'block';
}
el.innerHTML = message;
}
function onFontLoaded(font) {
var glyphsDiv, i, x, y, fontSize;
window.font = font;
// Show the first 100 glyphs.
glyphsDiv = document.getElementById('glyphs');
glyphsDiv.innerHTML = '';
amount = Math.min(100, font.glyphs.length);
x = 50;
y = 120;
fontSize = 72;
for (i = 0; i < amount; i++) {
glyph = font.glyphs.get(i);
ctx = createGlyphCanvas(glyph, 150);
glyph.draw(ctx, x, y, fontSize);
glyph.drawPoints(ctx, x, y, fontSize);
glyph.drawMetrics(ctx, x, y, fontSize);
}
if (font.hinting) {
hintingCheckbox.disabled = false;
hintingLabel.className = '';
} else {
hintingCheckbox.disabled = true;
hintingCheckbox.checked = false;
hintingLabel.className = 'disabled';
}
renderText();
}
function onReadFile(e) {
document.getElementById('font-name').innerHTML = '';
var file = e.target.files[0];
var reader = new FileReader();
reader.onload = function(e) {
try {
font = opentype.parse(e.target.result);
onFontLoaded(font);
showErrorMessage('');
} catch (err) {
showErrorMessage(err.toString());
}
};
reader.onerror = function(err) {
showErrorMessage(err.toString());
};
reader.readAsArrayBuffer(file);
}
var fontFileName = 'fonts/FiraSansMedium.woff';
document.getElementById('font-name').innerHTML = fontFileName.split('/')[1];
var fileButton = document.getElementById('file');
fileButton.addEventListener('change', onReadFile, false);
// FireFox & Chrome fire the 'input' event continuously, then the 'change' event on mouse up.
// IE 11 doesn't fire the 'input' event at all, but che 'change' event continuously.
fontSizeSlider.addEventListener('input', fontSizeChanged, false);
fontSizeSlider.addEventListener('change', fontSizeChanged, false);
enableHighDPICanvas('preview');
enableHighDPICanvas('snap');
opentype.load(fontFileName, function(err, font) {
var amount, glyph, ctx, x, y, fontSize;
if (err) {
showErrorMessage(err.toString());
return;
}
onFontLoaded(font);
});
</script>
</body>
</html>