arrowhead-38c.tar.gz
Subject: set arrow ... {nohead|head|heads} {size ...}

I've extended the arrow functionality for 2D graphs. New keyword "heads" 
lets both forward and backward arrow heads to draw. New keyword "size" + 
params controls the length of the arrow head edge and the angle between 
the vector and the arrow edges. (Currently, head edges are automatically 
scaled by the vector length which is not desirable for publications.)

Syntax:
  set arrow from ... to ...
    { nohead | head | heads }
    { size <length>,<angle> }
    ...

Length scales with respect to the x axis of the graph. It accepts usual 
coordinate keywords, like "screen".

Missing features / bugs:
  - routine for drawing arrows in 3D graphs should be updated
  - the main functionality is in term.c:do_arrow. There are some terminals 
    with their own arrow drawing routines, like xfig or latex. These are
    not updated by this patch

Is there somebody who wish to solve the above bugs?


Petr Mikulik, July 1999 + March 2000
