PGPLOT Module: PGARRO -- draw an arrow


SUBROUTINE PGARRO (X1, Y1, X2, Y2)
REAL X1, Y1, X2, Y2

Draw an arrow from the point with world-coordinates (X1,Y1) to
(X2,Y2). The size of the arrowhead at (X2,Y2) is determined by
the current character size set by routine PGSCH. The default size
is 1/40th of the smaller of the width or height of the view surface.
The appearance of the arrowhead (shape and solid or open) is
controlled by routine PGSAH.


Arguments
X1, Y1 (input) : world coordinates of the tail of the arrow.
X2, Y2 (input) : world coordinates of the head of the arrow.