While a PLOT is up, it is possible to interact with individual layers
to change their attributes.
The layers are accessible via reg.<plot_id>.layers.<layer_name>.
Some people like to do this every time:
set reg.<plot_id>.layers.<layer_name>.color "red"
Others like to pre-define a handle for the set of layers (usually just after
PLOT is started) and then use that:
set mylayers reg.<plot_id>.layers
...
set mylayers.<layer_name>.color "red"
PLOT has a significant number of messages that it sends out. Inside a
macro it is usually useful to filter them out by FID (the from ID) and
then by name.
procedure processMessage m:msg
say "Got message name=^msg.name info=msg^info data=^msg.data"
if msg.fid eqs "MYPLOT" then
if msg.name eqs "MARK" then
...
See the PLOT explain file and the API for nxm.sys.libg.MPlot
for more details.
See the %test_plot macro in the test area of SYS for
examples.