Arrows

 In GLE95 arrows may be added to the start, end or both start 
and end of lines, arcs and Bezier curves. Arrows are treated
as a special class of markers and their characteristics are
set up by a 'Set' command prior to use. Set covers the
arrow style, size and color. There is a preset paramet
'auto' which defines a size relative to the current line 
width. Thus giving a size as auto*2.5 will force an arrow
to be 2.5 times the size deemed appropriate for the current
line width, whereas a size of 2.5 merely sets a fixed arrow
size relative to its base value irrespective of the line 
width.

The parameter autocolor serves a similar function for colors 
by automatically setting the arror color to that of its 
associated line or curve. Arrows are normally drawn in the 
direction of the line or curve, but may be forced to change
by the parameter angle. 