x, y, angle, justif, text
Plot text at a given position and angle in a graph.

PARAMETERS
----------

x      -  The X-coordinate at which to place the hot-spot of the
          text string.

y      -  The Y-coordinate at which to place the hot-spot of the
          text string.

angle  -  The angle of the baseline of the text, measured
          anti-clockwise from the horizontal.

justif -  The position of the hot-spot within the string. A value
          of 0 places the hot-spot at the first character of the
          string, 0.5 places the hot-spot at the center of the
          string and 1 places the hot-spot at the end of the string.

text   -  The text string to be rendered.
