[daip] buglet in TVLINE

[Eric Greisen]

Claire Chandler writes:
 > It seems that even when values for TVCORN and TVXY are set prior to 
 > running, TVLINE still uses the cursor to set the beginning and ending 
 > pixels.  This behaviour is supposed to be only when TVCORN and TVXY are 
 > set to zero, according to the help, and means that the beginning and 
 > ending points cannot be specified manually before running TVLINE.
 > 

Actually it is pretty fancy and does seem to work.  If you set nboth
end points within the size of the screen (> 0, < max size told to you
as you start up e.g.1270 x 924) then it draws the line.  If you set, 
e.g. TVXY = 800,0 it will ask for the cursor to point at the 2nd
location.  When it does the plot however, it uses the x of 800 and
takes the y from the cursor.  It will do this at each end and for
either x or y.  (I tested this just now.)

Eric Greisen