how to control the lines size when add Own Technical and add legend?

[cvJie]

hi,Daniel:

       I use the mpf.make_addplot add my own Technical(MA55,MA200,....)，but the line too large， I need to shrink it .

At the moment,I need add the legend based on different color to different lines.

can you give my some advices?

thanks

[DanielGoldfarb]

• First, please make sure you have the latest version of mplfinance (pip install --upgrade mplfinance) as the algorithm for adjusting widths has changed a couple of times.
• Second, please note that mpf.make_addplot() has a width= kwarg that can be used to adjust line widths (or bar widths for bar charts). There is also a linestyle= kwarg to make_addplot() which may be useful for you (see https://matplotlib.org/3.1.0/gallery/lines_bars_and_markers/linestyles.html).
• If the width is still an issue after the above, read carefully through this entire tutorial. In particular, for what you described, you may need to adjust Item: 'lines', Keyword: 'line_width', however I recommend first trying some of the simpler approaches suggested in that notebook.

Please let me know how that works out for you. Thank you. --Daniel

[cvJie]

• First, please make sure you have the latest version of mplfinance (pip install --upgrade mplfinance) as the algorithm for adjusting widths has changed a couple of times.
• Second, please note that mpf.make_addplot() has a width= kwarg that can be used to adjust line widths (or bar widths for bar charts). There is also a linestyle= kwarg to make_addplot() which may be useful for you (see https://matplotlib.org/3.1.0/gallery/lines_bars_and_markers/linestyles.html).
• If the width is still an issue after the above, read carefully through this entire tutorial. In particular, for what you described, you may need to adjust Item: 'lines', Keyword: 'line_width', however I recommend first trying some of the simpler approaches suggested in that notebook.

Please let me know how that works out for you. Thank you. --Daniel

thanks ,Daniel
I used the width solve my trouble,code as:mpf.make_addplot(tech_index_dataframe,type='line',width=0.01);
but I don't know how to add legend ?
and I find the url:#181 answer:Legends are not yet available in mplfinance;

Can it be solved now？
thanks

[DanielGoldfarb]

@cvJie
At this point in time, the only way I can think to do legends is to use mpf.plot(...,returnfig=True,...) to get back the Figure and Axes, and then somehow use https://matplotlib.org/api/_as_gen/matplotlib.axes.Axes.legend.html to create a legend and the call plt.show(). (You need to call plt.show() because when returnfig=True then mpf.plot() will not call show().)

I've never done this creating legends myself, so I don't know if I can be more help other than suggesting this approach.

At some point mplfinance will support legends more directly, but unless someone else wants to work on it, I myself am probably not going to have time to work on it for a while.