abcjs/src/write/creation/add-chord.js

Renderer for abc music notation

var RelativeElement = require('./elements/relative-element');
var spacing = require('../helpers/spacing');
const translateChord = require("./translate-chord");

var addChord = function (getTextSize, abselem, elem, roomTaken, roomTakenRight, noteheadWidth, jazzchords, germanAlphabet) {
	for (var i = 0; i < elem.chord.length; i++) {
		var pos = elem.chord[i].position;
		var rel_position = elem.chord[i].rel_position;
		var isAnnotation = pos === "left" || pos === "right" || pos === "below" || pos === "above" || !!rel_position
		var font;
		var klass;
		if (isAnnotation) {
			font = 'annotationfont';
			klass = "abcjs-annotation";
		} else {
			font = 'gchordfont';
			klass = "abcjs-chord";
		}
		var attr = getTextSize.attr(font, klass);

		var name = elem.chord[i].name
		var ret;
		//console.log("chord",name)
		if (typeof name === "string") {
			ret = chordString(name, pos, rel_position, isAnnotation, font, klass, attr, getTextSize, abselem, elem, roomTaken, roomTakenRight, noteheadWidth, jazzchords, germanAlphabet)
			roomTaken = ret.roomTaken
			roomTakenRight = ret.roomTakenRight
		} else {
			for (var j = 0; j < name.length; j++) {
				ret = chordString(name[j].text, pos, rel_position, isAnnotation, font, klass, attr, getTextSize, abselem, elem, roomTaken, roomTakenRight, noteheadWidth, jazzchords, germanAlphabet)
				roomTaken = ret.roomTaken
				roomTakenRight = ret.roomTakenRight
			}
		}
	}
	return { roomTaken: roomTaken, roomTakenRight: roomTakenRight };
};

function chordString(chordString, pos, rel_position, isAnnotation, font, klass, attr, getTextSize, abselem, elem, roomTaken, roomTakenRight, noteheadWidth, jazzchords, germanAlphabet) {
	var chords = chordString.split("\n");
	for (var j = chords.length - 1; j >= 0; j--) { // parse these in opposite order because we place them from bottom to top.
		var chord = chords[j];
		var x = 0;
		var y;
		if (!isAnnotation)
			chord = translateChord(chord, jazzchords, germanAlphabet);
		var dim = getTextSize.calc(chord, font, klass);
		var chordWidth = dim.width;
		var chordHeight = dim.height / spacing.STEP;
		switch (pos) {
			case "left":
				roomTaken += chordWidth + 7;
				x = -roomTaken;        // TODO-PER: This is just a guess from trial and error
				y = elem.averagepitch;
				abselem.addExtra(new RelativeElement(chord, x, chordWidth + 4, y, {
					type: "text",
					height: chordHeight,
					dim: attr,
					position: "left"
				}));
				break;
			case "right":
				roomTakenRight += 4;
				x = roomTakenRight;// TODO-PER: This is just a guess from trial and error
				y = elem.averagepitch;
				abselem.addRight(new RelativeElement(chord, x, chordWidth + 4, y, {
					type: "text",
					height: chordHeight,
					dim: attr,
					position: "right"
				}));
				break;
			case "below":
				// setting the y-coordinate to undefined for now: it will be overwritten later on, after we figure out what the highest element on the line is.
				abselem.addRight(new RelativeElement(chord, 0, 0, undefined, {
					type: "text",
					position: "below",
					height: chordHeight,
					dim: attr,
					realWidth: chordWidth
				}));
				break;
			case "above":
				// setting the y-coordinate to undefined for now: it will be overwritten later on, after we figure out what the highest element on the line is.
				abselem.addRight(new RelativeElement(chord, 0, 0, undefined, {
					type: "text",
					position: "above",
					height: chordHeight,
					dim: attr,
					realWidth: chordWidth
				}));
				break;
			default:
				if (rel_position) {
					var relPositionY = rel_position.y + 3 * spacing.STEP; // TODO-PER: this is a fudge factor to make it line up with abcm2ps
					abselem.addRight(new RelativeElement(chord, x + rel_position.x, 0, elem.minpitch + relPositionY / spacing.STEP, {
						position: "relative",
						type: "text",
						height: chordHeight,
						dim: attr
					}));
				} else {
					// setting the y-coordinate to undefined for now: it will be overwritten later on, after we figure out what the highest element on the line is.
					var pos2 = 'above';
					if (elem.positioning && elem.positioning.chordPosition)
						pos2 = elem.positioning.chordPosition;

					if (pos2 !== 'hidden') {
						abselem.addCentered(new RelativeElement(chord, noteheadWidth / 2, chordWidth, undefined, {
							type: "chord",
							position: pos2,
							height: chordHeight,
							dim: attr,
							realWidth: chordWidth
						}));
					}
				}
		}
	}
	return { roomTaken: roomTaken, roomTakenRight: roomTakenRight };
}
module.exports = addChord;