satie/src/implChord_ledgerLineView.ts

A sheet music renderer for the web

/**
 * This file is part of Satie music engraver <https://github.com/jnetterf/satie>.
 * Copyright (C) Joshua Netterfield <joshua.ca> 2015 - present.
 * 
 * Satie is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * Satie is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with Satie.  If not, see <http://www.gnu.org/licenses/>.
 */

import {PrintStyle} from "musicxml-interfaces";
import {createFactory, Component, PropTypes} from "react";

import Line from "./private_views_line";
import {bboxes} from "./private_smufl";

const $Line = createFactory(Line);

export interface IProps {
    key?: string | number;
    spec: PrintStyle;
    notehead: string;
}

/**
 * Renders a ledger line at (x, y + line).
 */
export default class LedgerLine extends Component<IProps, void> {
    static contextTypes = {
        originY: PropTypes.number.isRequired
    } as any;

    context: {
        originY: number;
    };

    render(): any {
        const spec = this.props.spec;
        const west = bboxes[this.props.notehead][3];
        const east = bboxes[this.props.notehead][0];
        const xOffset = (east - west) * 10;
        return $Line({
            stroke: spec.color,
            strokeWidth: 2.2,
                // Ledger lines should be thicker than regular lines.
            x1: spec.defaultX + (spec.relativeX || 0) - 3.2,
            x2: spec.defaultX + (spec.relativeX || 0) + xOffset - 0.2,
            y1: this.context.originY - spec.defaultY - (spec.relativeX || 0),
            y2: this.context.originY - spec.defaultY - (spec.relativeX || 0)
        });
    }
}