Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
can BT plot muti-colors for a line as in the below chart?
No. Although it has been said many times, backtrader is not a charting platform. Charting is only a visual aid. Algotrading should rely on numbers.
If you create several lines of different colors, than this might help you.