Name
  extgs:SetAlphaFill -- set filling transparency
Synopsis

      status = extgs:SetAlphaFill(value)

Function
  `extgs:SetAlphaFill()` defines the transparency for filling.

  When `extgs:SetAlphaFill()` succeeds, it returns `#HPDF_OK`. Otherwise, it returns an error code and the error handler is invoked.

Inputs
  value
    the alpha value for filling; it must be between 0 and 1
Results
  status
    status code
Errors
  `#HPDF_INVALID_OBJECT` - An invalid ExtGState handle was set.

  `#HPDF_EXT_GSTATE_READ_ONLY` - The ExtGState object is read only.

  `#HPDF_EXT_GSTATE_OUT_OF_RANGE` - An invalid value was set at value parameter.

  `#HPDF_FAILED_TO_ALLOC_MEM` - Memory allocation failed.

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