##
21.5 Setting canvas properties

A `canvas.T` object provides the following methods to define the information about the output file.

    can = canvas.init("foo.pdf")
    ar = area.T(...)
    can.set_author("Charles Dickens")
    can.set_title("A tale of two cities")
    ar.draw(can)

`set_title`( | str)

  Define the string to be shown in EPS/PDF "Title" field. The default value is the name of the script that creates the EPS/PDF file.

`set_author`( | str)

  Set the author string. Unless this method is called, the Author field is not output in EPS or PDF.

`set_creator`( | str)

  Define the string to be shown in EPS %%Creator or PDF Producer field. The default value is "pychart".

`set_creation_date`( | str)

  Define the string to be shown in EPS/PDF "CreationDate" field. Defalt value of this field is the current time.