abcjs/src/write/helpers/get-text-size.js

Renderer for abc music notation

var GetTextSize = function GetTextSize(getFontAndAttr, svg) {
	this.getFontAndAttr = getFontAndAttr;
	this.svg = svg;
};

GetTextSize.prototype.updateFonts = function (fontOverrides) {
	this.getFontAndAttr.updateFonts(fontOverrides);
};

GetTextSize.prototype.attr = function (type, klass) {
	return this.getFontAndAttr.calc(type, klass);
};

GetTextSize.prototype.calc = function (text, type, klass, el) {
	var hash;
	// This can be passed in either a string or a font. If it is a string it names one of the standard fonts.
	if (typeof type === 'string')
		hash = this.attr(type, klass);
	else {
		hash = {
			font: {
				face: type.face,
				size: type.size,
				decoration: type.decoration,
				style: type.style,
				weight: type.weight
			},
			attr: {
				"font-size": type.size,
				"font-style": type.style,
				"font-family": type.face,
				"font-weight": type.weight,
				"text-decoration": type.decoration,
				"class": this.getFontAndAttr.classes.generate(klass)
			}
		}
	}
	var size = this.svg.getTextSize(text, hash.attr, el);
	if (hash.font.box) {
		// Add padding and an equal margin to each side.
		return { height: size.height + hash.font.padding * 4, width: size.width + hash.font.padding * 4 };
	}
	return size;
};

GetTextSize.prototype.baselineToCenter = function (text, type, klass, index, total) {
	// This is for the case where SVG wants to use the baseline of the first line as the Y coordinate.
	// If there are multiple lines of text or there is an array of text then that will not be centered so this adjusts it.
	var height = this.calc(text, type, klass).height;
	var fontHeight = this.attr(type, klass).font.size;

	return height * 0.5 + (total - index - 2) * fontHeight;
};


module.exports = GetTextSize;