SNMPFS(4) SNMPFS(4)
NAME
drawvars - Tool to draw positive functions into image files
SYNOPSIS
drawvars [ -T ] [ -t title ] [ -s x start ] [ -e x end ] [
-m y max ] [ -v var1,var2,var3 ]
DESCRIPTION
Drawvars is a little cousin of gview(1). It has been created
to be able to write representation of positive functions to
files. It writes to stdout an image(6) data to be piped to
external programs such as page(1) or topng(1).
USAGE
-T interprets x axis as a time value to use with time
series values
-t specify a title to the image
-s specify the minimun x value
-e specify the maximun x value
-m specify the maximun y value (y minimun is always 0)
-v specify the captions to identify each function values
To see the format drawvars can read values, take a look at
the samples.
EXAMPLES
This command writes the rand() and rand()^2 distribution:
awk 'BEGIN{
for(x=0;x<100;x++) {
print x " " 100*rand() " " 100*(rand()*rand())
}
}' | 8.out -t 'awk rand() distribution' -s 0 -e 100 -m 120 -v x,'rand()','rand()^2' | topng > sample.png
saving the result as a png image in sample.png
This sample draws the positive values of the sin of (x)
scaled to fit the window (like the sample of gview(1)):
awk 'BEGIN{
for(x=.1;x<500;x+=.1)
print x,sin(x)*100/x
}' | 8.out -t sin -s 0 -e 500 -m 100 -v x,sin | page
and uses page to display it on the screen
SNMPFS(4) SNMPFS(4)
FILES
/$objtype/bin/aux/drawvars
/sys/man/4/drawvars
/lib/ndb/snmp
SOURCE
/n/sources/contrib/gabidiaz/drawvars.tgz
BUGS
A complete implementation of gview features should be done,
at least, autoscale and support for negative functions.
gabidiaz@gmail.com.