docs: function () {
              if (!this.coords.w_rs) {
                  this.coords.p_pointer = 0;
                  return;
              }
  
              if (this.coords.x_pointer < 0 || isNaN(this.coords.x_pointer)  ) {
                  this.coords.x_pointer = 0;
              } else if (this.coords.x_pointer > this.coords.w_rs) {
                  this.coords.x_pointer = this.coords.w_rs;
              }
  
              this.coords.p_pointer = this.toFixed(this.coords.x_pointer / this.coords.w_rs * 100);
          }