plot an arrow

dx,dyfloatmmdisplacement of the arrow
dptrfloatmmlength of the pointer
angsfloatdegrsmall angle of the pointer
anglfloatdegrlarge angle or the pointer
bothint--if TRUE, both ends will have a pointer
openint--if TRUE, the pointer is open
filledint--if TRUE, the pointer is filled
perpint--if TRUE, text in the shaft is perpendicular to it
textchar*--text in the middle of the shaft


plarrowm plots an arrow, starting at the current position, extending to dx,dy, in mm If dptr=0, the current symbol height will be used. Filling of the pointer is performed inside the polygon 12341 (see the example below). An open pointer misses lines 1--2 and 4--1.