Change plot color

[geirak]

Hi
I have an indicator where I would like to change plot color based on certain criteria indicating a bullish or bearish scenario. Is it possible to specify colors per bar with the mpf.make_addplot color parameter, or can only one color be passed in?
Regards
Geir

[DanielGoldfarb]

The color kwarg in mpf.make_addplot() is only for plot types line, scatter and bar. Ohlc bars and candles are colored by "marketcolors", which are part of the mpf "style" that you pass in.

That said, I belive what you are looking for will be handled by the following enhancement: #205 (comment)

Let me know if that is what you are looking for.

[DanielGoldfarb]

@geirak ... I just realized that you already commented on the above mentioned enhancement. However you bring up an interesting point. Until that enhancement is implemented, it may be possible to use mpf.make_addplot() as a work-around. It's a little bit klunky but it may work: Use mpf.make_addplot(type='scatter',color=?) with sparse data (set all data to nan except for where you want the scatter mark to appear) and choose a rectangle or square as a scatter mark and place it right on top of the candle.

[geirak]

@DanielGoldfarb
Right :-)

The workaround you mention sounds like something I am looking (I saw it in one of your examples files) into for another thing I need.

Here is an example of what I am looking for:

Is it is possible to control the color of a line plot on a bar by bar basis. See attached screen shot (Ninja Trader), where you can see that the slow line changes color when the fast yellow line crosses the slow line. I can deal with all the logic, I just need to pass in the colors on a bar by bar basis

(sorry about all the edits...)

[DanielGoldfarb]

@geirak
Interesting. You may be able to do that with two mpf.make_addplot() type=line plots, using two different colors, and where you place nan values in each line where you want to see the other line's color.

[geirak]

@DanielGoldfarb
right - that would work for me. I'll give it a shot.

Thank you Daniel for your excellent help!!!

[geirak]

@DanielGoldfarb Daniel - I just wanted to give feedback to show that your proposal works.

Assuming that there are already columns for the plot value ("D") and a column for the plot color ("dcolor") I created two new columns "dbull" and "dbear", which were filled with values only for the corresponding color.

I noticed that there would always be a gap in the plot when the color changed, so I had to ensure that there was an overlap at the color change.

Below a couple of excerpts from how I solved it. I am very new to Python and pandas, so I am sure there are better ways to accomplish this

Here is how I am plotting:

And here is the first plot

Axis etc. still need some more work...

[DanielGoldfarb]

@geirak
Awesome! Thank you so much for sharing. I love to see the creative things people are doing with mplfinance (both the code and the output). I had done a little playing around and also came to the conclusion that a small overlap is needed to avoid a gap at the point of color change. Looks great!
Thanks again. All the best. --Daniel