Name
  annot:SetFreeTextAnnot3PointCalloutLine -- set free text annotation three point callout line
Synopsis

      status = annot:SetFreeTextAnnot3PointCalloutLine(startpoint, kneepoint,
                   endpoint)

Function
  This method is currently undocumented in libHaru. Complain to the libHaru authors.

  The parameters `startpoint`, `kneepoint`, and `endpoint` must be tables that describe a point each. Thus, each of those tables must contain the fields `x` and `y`.

  Returns `#HPDF_OK` on success. Otherwise, returns an error code and the error handler is invoked.

Inputs
  startpoint
    start point
  kneepoint
    knee point
  endpoint
    end point
Results
  status
    status code

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