three.js/examples/js/loaders/FontLoader.js

( function () {

	class FontLoader extends THREE.Loader {

		constructor( manager ) {

			super( manager );

		}
		load( url, onLoad, onProgress, onError ) {

			const scope = this;
			const loader = new THREE.FileLoader( this.manager );
			loader.setPath( this.path );
			loader.setRequestHeader( this.requestHeader );
			loader.setWithCredentials( this.withCredentials );
			loader.load( url, function ( text ) {

				const font = scope.parse( JSON.parse( text ) );
				if ( onLoad ) onLoad( font );

			}, onProgress, onError );

		}
		parse( json ) {

			return new Font( json );

		}

	}

	//

	class Font {

		constructor( data ) {

			this.isFont = true;
			this.type = 'Font';
			this.data = data;

		}
		generateShapes( text, size = 100 ) {

			const shapes = [];
			const paths = createPaths( text, size, this.data );
			for ( let p = 0, pl = paths.length; p < pl; p ++ ) {

				shapes.push( ...paths[ p ].toShapes() );

			}

			return shapes;

		}

	}
	function createPaths( text, size, data ) {

		const chars = Array.from( text );
		const scale = size / data.resolution;
		const line_height = ( data.boundingBox.yMax - data.boundingBox.yMin + data.underlineThickness ) * scale;
		const paths = [];
		let offsetX = 0,
			offsetY = 0;
		for ( let i = 0; i < chars.length; i ++ ) {

			const char = chars[ i ];
			if ( char === '\n' ) {

				offsetX = 0;
				offsetY -= line_height;

			} else {

				const ret = createPath( char, scale, offsetX, offsetY, data );
				offsetX += ret.offsetX;
				paths.push( ret.path );

			}

		}

		return paths;

	}

	function createPath( char, scale, offsetX, offsetY, data ) {

		const glyph = data.glyphs[ char ] || data.glyphs[ '?' ];
		if ( ! glyph ) {

			console.error( 'THREE.Font: character "' + char + '" does not exists in font family ' + data.familyName + '.' );
			return;

		}

		const path = new THREE.ShapePath();
		let x, y, cpx, cpy, cpx1, cpy1, cpx2, cpy2;
		if ( glyph.o ) {

			const outline = glyph._cachedOutline || ( glyph._cachedOutline = glyph.o.split( ' ' ) );
			for ( let i = 0, l = outline.length; i < l; ) {

				const action = outline[ i ++ ];
				switch ( action ) {

					case 'm':
						// moveTo

						x = outline[ i ++ ] * scale + offsetX;
						y = outline[ i ++ ] * scale + offsetY;
						path.moveTo( x, y );
						break;
					case 'l':
						// lineTo

						x = outline[ i ++ ] * scale + offsetX;
						y = outline[ i ++ ] * scale + offsetY;
						path.lineTo( x, y );
						break;
					case 'q':
						// quadraticCurveTo

						cpx = outline[ i ++ ] * scale + offsetX;
						cpy = outline[ i ++ ] * scale + offsetY;
						cpx1 = outline[ i ++ ] * scale + offsetX;
						cpy1 = outline[ i ++ ] * scale + offsetY;
						path.quadraticCurveTo( cpx1, cpy1, cpx, cpy );
						break;
					case 'b':
						// bezierCurveTo

						cpx = outline[ i ++ ] * scale + offsetX;
						cpy = outline[ i ++ ] * scale + offsetY;
						cpx1 = outline[ i ++ ] * scale + offsetX;
						cpy1 = outline[ i ++ ] * scale + offsetY;
						cpx2 = outline[ i ++ ] * scale + offsetX;
						cpy2 = outline[ i ++ ] * scale + offsetY;
						path.bezierCurveTo( cpx1, cpy1, cpx2, cpy2, cpx, cpy );
						break;

				}

			}

		}

		return {
			offsetX: glyph.ha * scale,
			path: path
		};

	}

	THREE.Font = Font;
	THREE.FontLoader = FontLoader;

} )();