perl : time vs Yvalue line graph

I need a simple(?) perl module to take data and draw a simple (?) graph 
like line  chart in excel.
I think I can get the data into the module however it wants it.
Simplest would be :
(Well simpler would be DATA without color and symbol, without HLINE )
given:

# I just made this input format up
DATA BLACK @ 01:00,1
DATA BLACK @ 01:30,2
DATA BLACK @ 02:00,3
DATA BLACK @ 02:30,6
DATA RED   * 03:00,9

HLINE RED 00:00,8    04:00,8    "upper threshold = 8.00"
HLINE RED 00:00 1.25 04:00,1.25 "lower threshold = 1.25"
SIZE 75 x 16 # columns wide by lines high
QUARDANT I

X-ORG 00:00
Y-ORG 1.00
TITLE  Patient 01249;  23 Jul 09
END

module would produce something like:


   12. |    |         |         |
       |    |         |         |  
   10. |    +    -    +    -    +   -
       |    |         |         *
    8. |------------------------------ upper threshold = 8.00
       |    |         |         |
    6. |    |         |    @    |
       |    +    -    +    -    +    -
    4. |    |         |         |
       |    |         @         |
    2. |    |    @    |         |
       |----@------------------------- lower threshold = 1.25
    0. +----+----+----+----+----+----
           01:00     02:00    03:00   ... 12:00  13:00 ... 23:00 ... 
00:00  01;00...

           Patient 01249;  23 Jul 09

Of course something slicker would be nice too.



Since there four bazillion books on perl,
not to mention the number of existing modules and web sites

I though there might be someone out that could point me in the right 
direction.

Thanks for any pointers that you can give me
.

• perl : time vs Yvalue line graph by Dennis German
• Re: perl : time vs Yvalue line graph by Shawn H. Corey