Can I implement a pen tool to draw lines or markers on the canvas?

[pikapi12321]

I can do that by writing a callback to mouse move and click events in matplotlib. Don't know if I can do similar things in finplot.

[highfestiva]

Straight lines can be drawn using Ctrl+drag, and then Ctrl+click to add additional poly lines. If you want curves, you'd have to implement them yourself in pyqtgraph (which finplot is based upon). GL!