The cpdf_show_xy() function
outputs the string text at
position with coordinates (x-coor,
y-coor).
The optional parameter
mode determines the unit length. If it's 0 or
omitted the default unit as specified for the page is used.
Otherwise the coordinates are measured in postscript points
disregarding the current unit.
注: The function cpdf_show_xy() is identical to cpdf_text() without the optional parameters.
See also cpdf_text().