graphic output on a PC

""Frank J. Manion"" manion at AQUILA.RM.FCCC.EDU
Fri Feb 16 12:44:58 EST 1996

(Dave Mitchell) writes:
>|> Although some GCG graphic programs create HPGL files that can be transferred 
>|> to the PC and loaded into CorelDraw, others don't seem to work so well.  In 
>|> particular, dotplots of data generated by COMPARE end up with all of the 
>|> individual points connected by lines when imported into Corel.  Does anyone 
>|> know of a way around this?
>It looks like the problem is in the way DOTPLOT creates the HPGL file.  If you 
look at
>the file, you'll see that the instructions force the plotter (or Corel) to 
>draw lines.  Perhaps someone at GCG will take a look at this and comment.
>Ellis Golub                            Phone: (215) 898-4629
>Biochemistry Department                FAX:   (215) 898-3695
>University of Pennsylvania             ellis at biochem.dental.upenn.edu
>School of Dental Medicine             
>4001 Spruce Street
>Philadelphia, PA 19104-6003

Just fyi...

Graphics programs which output data as single "points" on devices often
implement some method to insure the point is actually visible to the human eye.
Dots of radius .0004 inches are not horribly visible with the naked eye.
Consequently you will see points rendered by some graphics programs
as either lines or filled boxes of small size. Quite often this type of
function is actually implemented in the graphics "driver".
This may be why the program functions in this way. I would hesitate to call
this a "problem". Reading the HPGL into CorelDraw is simply using the output in
a way the original authors never envisioned.

-- Frank

Frank J. Manion
Director, Research Computing Services
The Fox Chase Cancer Center                              Phone: 215-728-3660
7701 Burholme Avenue                                     FAX:   215-728-2513
Philadelphia, PA  19111                         internet: FJ_Manion at fccc.edu

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