     },
            drawCustomSymbol: function ({ ctx, coordinate, isActive }) {
              var color
              var size
              if (isActive) {
                color = '#6767dd'
                size = 6
              } else {
                color = '#dd22fc'
                size = 4
              }
              ctx.fillStyle = color
              ctx.beginPath()
              ctx.moveTo(coordinate.x - size, coordinate.y - size)
              ctx.lineTo(coordinate.x + size, coordinate.y - siz