code: function (x0, y0, radius, start, end, color, c)
      {
          _c = c || _c
          if (color)
          {
              _c.fillStyle = color
          }
          x0 *= _scale
          y0 *= _scale
          radius *= _scale
          const interval = Math.PI / radius / 4
          for (let i = start; i <= end; i += interval)
          {
              put(x0 + Math.cos(i) * radius, y0 + Math.sin(i) * radius)
          }
      }
docs: draw arc
  @param {number} x0 - x-start
  @param {number} y0 - y-start
  @param {number} radius - radius
  @param {number} start angle (radians)
  @param {number} end angle (radians)
  @param {string} color
  @param {CanvasRenderingContext2D} [c]