text: class Material {
  
      /**
       * Creates a material
       * @param {*} fill A hex code
       * @param {*} stroke A hex code
       */
      constructor(fill, stroke) {
          this.fill = fill;
          this.stroke = stroke;
      }
  
      getFill() {
          return this.fill;
      }
      setFill(color) {
          this.fill = color;
      }
  
      getStroke() {
          return this.stroke;
      }
      setStroke(color) {
          this.stroke = color;
      }
  }