constructor(graphics) {
    super(componentNames.LINE, graphics);

    /**
     * Brush width
     * @type {number}
     * @private
     */
    this._width = 12;

    /**
     * fabric.Color instance for brush color
     * @type {fabric.Color}
     * @private
     */
    this._oColor = new fabric.Color('rgba(0, 0, 0, 0.5)');

    /**
     * Listeners
     * @type {object.<string, function>}
     * @private
     */
    this._listeners = {
      mousedown: this._onFabricMouseDown.bind(this),
      mousemove: this._onFabricMouseMove.bind(this),
      mouseup: this._onFabricMouseUp.bind(this),
    };
  }
Line
@class Line
@param {Graphics} graphics - Graphics instance
@extends {Component}
@ignore