/
varfonts.ts
53 lines (47 loc) · 1.63 KB
/
varfonts.ts
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import * as opentype from 'opentype.js';
declare var VariableFont;
import * as $ from "jquery";
// from StackOverflow, of course...
function _base64ToArrayBuffer(base64) {
var binary_string = window.atob(base64);
var len = binary_string.length;
var bytes = new Uint8Array(len);
for (var i = 0; i < len; i++) {
bytes[i] = binary_string.charCodeAt(i);
}
return bytes.buffer;
}
function makeSliders(axes) {
for (var axis of axes) {
console.log(axis);
var sliderdiv = $('<div class="axisslider"/>');
var label = $(`<label for="axis_${axis.tag}"/>`).text(axis.name.en);
sliderdiv.append(label);
var input = $(`<input type="range" id="axis_${axis.tag}" min="${axis.minValue}" max="${axis.maxValue}" value="${axis.defaultValue}"/>`)
sliderdiv.append(input);
$("#varfont_axes").append(sliderdiv);
}
}
export function handleNewVariableFont () {
// @ts-ignore: CSS stylesheets are messy.
var fontUrl = document.styleSheets[1].rules[0].style.src;
fontUrl = fontUrl.slice(4, -1) // url( ... )
var fontData = _base64ToArrayBuffer(fontUrl.split(",")[1]);
var font = opentype.parse(fontData);
var varFont = new VariableFont(font);
var axes = varFont.getAxes()
$("#varfont_axes").empty()
if (axes.length > 0) {
makeSliders(axes)
}
}
export function setupAxisSliders() {
$(document).on('input change', '#varfont_axes input', function() {
var varSettings = [];
$("#varfont_axes input").each(function () {
var tag = this.id.substr(5) // "axis_"
varSettings.push(`'${tag}' ${$(this).val()}`);
})
$("#words").css("font-variation-settings", varSettings.join(","));
});
}