[R-SIG-Finance] How to add net lines to quantmod charts

[Samo Pahor]

Hi,

Is it possible to produce attached chart with so called "net lines" (short
line with number on top in different colors) using quantmod?

The Idea is that there would be a data frame with datetime, value, type
(each row represents one "net line" with its numeric value and whether it is
a sell (color in red) or buy(color in green)). And this lines with data in
dataframe would then be overlayed on quantmod chart.

Is something like this possible with quantmod? I would appreciate any
ideas/examples of code...

Best regards,
Samo.
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