
plptex: Write text inside the viewport 

DESCRIPTION:

    This function is used in example 2-4,10,12-14,20,23,24,26. 

SYNOPSIS:

plptex(x, y, dx, dy, just, text)

ARGUMENTS:

    x (PLFLT, input) :      x coordinate of reference point of string. 

    y (PLFLT, input) :      y coordinate of reference point of string. 

    dx (PLFLT, input) :    Together with dy, this specifies the
    inclination of the string.  The baseline of the string is parallel
    to a line joining (
    x, 
    y) to (
    x+
    dx, 
    y+
    dy). 

    dy (PLFLT, input) :    Together with dx, this specifies the
    inclination of the string. 

    just (PLFLT, input) :    Specifies the position of the string relative
    to its reference point.  If just=0., the reference point is at the
    left and if just=1., it is at the right of the string.    Other
    values of just give intermediate justifications. 

    text (const char *, input) :    The string to be written out. 
