Draws an arc.
pdf_document
The document handle, returned by cpdf_open().
x
The x-coordinate of the center
y
The y-coordinate of the center
radius
The arc radius
start
The starting angle, in degrees
end
The ending angle, in degrees
mode
The optional parameter mode
determines the unit length. If it is 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.