abcjs/src/write/draw/staff.js

Renderer for abc music notation

var printStaffLine = require('./staff-line');

function printStaff(renderer, startx, endx, numLines, linePitch, dy) {
	var klass = "abcjs-top-line";
	var pitch = 2;
	if (linePitch) {
		pitch = linePitch;
	}
	renderer.paper.openGroup({ prepend: true, klass: renderer.controller.classes.generate("abcjs-staff") });
	// If there is one line, it is the B line. Otherwise, the bottom line is the E line.
	var firstYLine = 0;
	var lastYLine = 0;
	if (numLines === 1) {
		printStaffLine(renderer, startx, endx, 6, klass, null, dy + renderer.lineThickness);
		firstYLine = renderer.calcY(10);
		lastYLine = renderer.calcY(2);
	} else {

		for (var i = numLines - 1; i >= 0; i--) {
			var curpitch = (i + 1) * pitch;
			lastYLine = renderer.calcY(curpitch);
			if (firstYLine === 0) {
				firstYLine = lastYLine;
			}
			printStaffLine(renderer, startx, endx, curpitch, klass, null, dy + renderer.lineThickness);
			klass = undefined;
		}
	}
	renderer.paper.closeGroup();
	return [firstYLine, lastYLine];
}

module.exports = printStaff;