abcjs/src/write/creation/create-time-signature.js

Renderer for abc music notation

//    abc_create_time_signature.js

var AbsoluteElement = require('./elements/absolute-element');
var glyphs = require('./glyphs');
var RelativeElement = require('./elements/relative-element');

var createTimeSignature = function (elem, tuneNumber) {
	elem.el_type = "timeSignature";
	var abselem = new AbsoluteElement(elem, 0, 10, 'staff-extra time-signature', tuneNumber);
	if (elem.type === "specified") {
		var x = 0;
		for (var i = 0; i < elem.value.length; i++) {
			if (i !== 0) {
				abselem.addRight(new RelativeElement('+', x + 1, glyphs.getSymbolWidth("+"), 6, { thickness: glyphs.symbolHeightInPitches("+") }));
				x += glyphs.getSymbolWidth("+") + 2;
			}
			if (elem.value[i].den) {
				var numWidth = 0;
				for (var i2 = 0; i2 < elem.value[i].num.length; i2++)
					numWidth += glyphs.getSymbolWidth(elem.value[i].num[i2]);
				var denWidth = 0;
				for (i2 = 0; i2 < elem.value[i].num.length; i2++)
					denWidth += glyphs.getSymbolWidth(elem.value[i].den[i2]);
				var maxWidth = Math.max(numWidth, denWidth);
				abselem.addRight(new RelativeElement(elem.value[i].num, x + (maxWidth - numWidth) / 2, numWidth, 8, { thickness: glyphs.symbolHeightInPitches(elem.value[i].num[0]) }));
				abselem.addRight(new RelativeElement(elem.value[i].den, x + (maxWidth - denWidth) / 2, denWidth, 4, { thickness: glyphs.symbolHeightInPitches(elem.value[i].den[0]) }));
				x += maxWidth
			} else {
				var thisWidth = 0;
				for (var i3 = 0; i3 < elem.value[i].num.length; i3++)
					thisWidth += glyphs.getSymbolWidth(elem.value[i].num[i3]);
				abselem.addRight(new RelativeElement(elem.value[i].num, x, thisWidth, 6, { thickness: glyphs.symbolHeightInPitches(elem.value[i].num[0]) }));
				x += thisWidth;
			}
		}
	} else if (elem.type === "common_time") {
		abselem.addRight(new RelativeElement("timesig.common", 0, glyphs.getSymbolWidth("timesig.common"), 6, { thickness: glyphs.symbolHeightInPitches("timesig.common") }));

	} else if (elem.type === "cut_time") {
		abselem.addRight(new RelativeElement("timesig.cut", 0, glyphs.getSymbolWidth("timesig.cut"), 6, { thickness: glyphs.symbolHeightInPitches("timesig.cut") }));
	} else if (elem.type === "tempus_imperfectum") {
		abselem.addRight(new RelativeElement("timesig.imperfectum", 0, glyphs.getSymbolWidth("timesig.imperfectum"), 6, { thickness: glyphs.symbolHeightInPitches("timesig.imperfectum") }));
	} else if (elem.type === "tempus_imperfectum_prolatio") {
		abselem.addRight(new RelativeElement("timesig.imperfectum2", 0, glyphs.getSymbolWidth("timesig.imperfectum2"), 6, { thickness: glyphs.symbolHeightInPitches("timesig.imperfectum2") }));
	} else if (elem.type === "tempus_perfectum") {
		abselem.addRight(new RelativeElement("timesig.perfectum", 0, glyphs.getSymbolWidth("timesig.perfectum"), 6, { thickness: glyphs.symbolHeightInPitches("timesig.perfectum") }));
	} else if (elem.type === "tempus_perfectum_prolatio") {
		abselem.addRight(new RelativeElement("timesig.perfectum2", 0, glyphs.getSymbolWidth("timesig.perfectum2"), 6, { thickness: glyphs.symbolHeightInPitches("timesig.perfectum2") }));
	} else {
		console.log("time signature:", elem);
	}
	return abselem;
};

module.exports = createTimeSignature;