p5.variableFont/p5.variableFont.js at main · arthurcloche/p5.variableFont · GitHub

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p5.Font.prototype.getVariations = function (logTables = false) {
	const axes = this.font.tables.fvar.axes;
	if (axes !== undefined || axes.length === 0) {
		let data = {};
		for (let axe of axes) {
			data[axe.tag] = {
				default: axe.defaultValue,
				min: axe.minValue,
				max: axe.maxValue,
			};
		}
		if (logTables) {
			console.log(data);
		}
		return data;
	} else {
		console.log("No valid font tables found, make sure to load a variable font");
	}
};

p5.Font.prototype.getStyles = function (logTables = false) {
	const styles = this.font.tables.fvar.instances;
	if (styles !== undefined && styles.length !== 0) {
		let data = {};
		for (let style of styles) {
			const { name, coordinates } = style;
			data[name.en] = coordinates;
		}
		if (logTables) {
			console.log(data);
		}
		return data;
	} else {
		console.log("No valid font tables found, make sure to load a variable font");
	}
};

p5.prototype.textWeight = function (theWeight) {
	return this._renderer._setProperty("_textWeight", theWeight);
};

p5.prototype.measureText = function (text) {
	const ctx = this._renderer.drawingContext;
	const bounds = ctx.measureText(text);
	const vertical = {
		ascent: bounds.actualBoundingBoxAscent,
		descent: bounds.actualBoundingBoxDescent,
	};
	const horizontal = {
		left: bounds.actualBoundingBoxLeft,
		right: bounds.actualBoundingBoxRight,
	};
	const height = bounds.actualBoundingBoxAscent + bounds.actualBoundingBoxDescent;
    const _width = bounds.actualBoundingBoxLeft + bounds.actualBoundingBoxRight;
	const verticalOffset = (vertical.ascent - vertical.descent) * 0.5;
    const horizontalOffset = (horizontal.left - horizontal.right) * 12

	return {
		offset: -verticalOffset,
		width: bounds.width,
		height: height,
	};
};

p5.prototype.textVariations = function (theVariations) {
	if (theVariations) {
		if (typeof theVariations === "number") {
			this._renderer._setProperty("_textWeight", theVariations);
		} else {
			let fontVariationsSettings = "";
			for (const variation in theVariations) {
				const name = variation;
				const value = theVariations[name];
				fontVariationsSettings += `'${variation}'${value},`;
			}
			let formatedfontVariationsSettings = fontVariationsSettings.slice(0, -1);
			this._renderer._setProperty(
				"_fontVariations",
				formatedfontVariationsSettings
			);
		}
	}
};

p5.prototype.loadFont = function (path, onSuccess, onError, CSSname = "") {
	//p5._validateParameters('loadFont', arguments);
	const p5Font = new p5.Font(this);
	let fontName;

	const self = this;
	/* to be used in the p5 editors or modules to ensure to import opentype.js if not there already*/
	if (typeof opentype === "undefined") {
		console.log(
			"It does seems that you are trying to load a font without opentype.js, add : '<script src='https://unpkg.com/opentype.js@1.3.4/dist/opentype.js'></script>' to you html <head>"
		);
		return;
	}
	opentype.load(path, (err, font) => {
		if (err) {
			p5._friendlyFileLoadError(4, path);
			if (typeof onError !== "undefined") {
				return onError(err);
			}
			console.error(err, path);
			return;
		}
		p5Font.font = font;

		if (typeof onSuccess !== "undefined") {
			onSuccess(p5Font);
		}
		self._decrementPreload();

		// check that we have an acceptable font type
		const validFontTypes = ["ttf", "otf", "woff", "woff2"];

		const fileNoPath = path.split("\\").pop().split("/").pop();

		const lastDotIdx = fileNoPath.lastIndexOf(".");
		let fontFamily;
		let newStyle;
		const fileExt = lastDotIdx < 1 ? null : fileNoPath.slice(lastDotIdx + 1);

		// if so, add it to the DOM (name-only) for use with DOM module
		if (validFontTypes.includes(fileExt)) {
			fontFamily = CSSname
				? CSSname
				: fileNoPath.slice(0, lastDotIdx !== -1 ? lastDotIdx : 0);
			newStyle = document.createElement("style");
			newStyle.appendChild(
				document.createTextNode(
					`\n@font-face {\nfont-family: ${fontFamily};\nsrc: url(${path});\n}\n`
				)
			);
			document.head.appendChild(newStyle);
		}
	});
	return p5Font;
};

p5.prototype.textFont = function (theFont, theSize, theVariations) {
	// p5._validateParameters('textFont', arguments);
	if (arguments.length) {
		if (!theFont) {
			throw new Error("null font passed to textFont");
		}
		this._renderer._applyTextProperties = function () {
			let font;
			const p = this._pInst;
			this._setProperty("_textAscent", null);
			this._setProperty("_textDescent", null);
			font = this._textFont;
			if (this._isOpenType()) {
				font = this._textFont.font.familyName;
				this._setProperty("_textStyle", this._textFont.font.styleName);
			}
			this.canvas.style.fontVariationSettings = this._fontVariations;
			this.drawingContext.font = `${this._textWeight || "normal"} ${
				this._textStyle || "normal"
			} ${this._textSize || 12}px ${font || "sans-serif"}`;

			this.drawingContext.textAlign = this._textAlign;
			if (this._textBaseline === CENTER) {
				this.drawingContext.textBaseline = _CTX_MIDDLE;
			} else {
				this.drawingContext.textBaseline = this._textBaseline;
			}
			return p;
		};

		if (theVariations) {
			if (typeof theVariations === "number") {
				this._renderer._setProperty("_textWeight", theVariations);
			} else {
				let fontVariationsSettings = "";
				for (const variation in theVariations) {
					const name = variation;
					const value = theVariations[name];
					fontVariationsSettings += `'${variation}'${value},`;
					if (name === "wght") {
						this._renderer._setProperty("_textWeight", value);
					}
				}
				let formatedfontVariationsSettings = fontVariationsSettings.slice(0, -1);
				this._renderer._setProperty(
					"_fontVariations",
					formatedfontVariationsSettings
				);
			}
		}else{
            this._renderer._setProperty(
                "_fontVariations",
                ""
            );
            this._renderer._setProperty(
                "_textWeight",
                ""
            );
        }

		this._renderer._setProperty("_textFont", theFont);
		if (theSize) {
			this._renderer._setProperty("_textSize", theSize);
			if (!this._renderer._leadingSet) {
				// only use a default value if not previously set (#5181)
				this._renderer._setProperty("_textLeading", theSize * _DEFAULT_LEADMULT);
			}
		}

		return this._renderer._applyTextProperties();
	}

	return this._renderer._textFont;
};

p5.prototype.loadGoogleFont = function (name, theVariations) {
	const collapsedName = name.split(" ").join("+");
	let variations = "";
	if (theVariations) {
		// if a single number is passed, we can assume that we want to load the weight
		if (typeof theVariations === "number") {
			variations = `:wght@${theVariations}`;
		}
		// if an array is passed, we want to load all the weights between the two values
		else if (Array.isArray(theVariations)) {
			variations += `:wght@${theVariations[0]}..${theVariations[1]}`;
		} else {
			const sortedVariations = Object.keys(theVariations)
				.sort()
				.reduce((result, key) => {
					result[key] = theVariations[key];
					return result;
				}, {});

			// if an obect is passed, we want to load all the axis
			let axis = ":";
			let values = "";
			for (const variation in sortedVariations) {
				axis += variation + ",";
				if (Array.isArray(sortedVariations[variation])) {
					values += `${sortedVariations[variation][0]}..${sortedVariations[variation][1]},`;
				} else {
					values += sortedVariations[variation] + ",";
				}
			}
			axis = axis.slice(0, -1);
			values = values.slice(0, -1);
			variations += axis.concat("@", values);
		}
	}
	const link = document.createElement("link");
	link.id = "font";
	link.href = `https://fonts.googleapis.com/css2?family=${collapsedName}${variations}&display=swap`;
	link.rel = "stylesheet";
	document.head.appendChild(link);
};