draw vertical crosshair when mouse cursor is on a level canvas

IPS-LMU / EMU-webApp

The EMU-webApp is an online and offline web application for labeling, visualizing and correcting speech and derived speech data.

http://ips-lmu.github.io/EMU-webApp/

MIT License

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draw vertical crosshair when mouse cursor is on a level canvas #238

Closed MJochim closed 6 years ago

MJochim commented 6 years ago

I tried to make sure this change does not break anything. I did not find any problems grepping through the code, but I am not very familiar with how the drawing components play together. And PhantomJS currently crashes on my machine (due itself having a problem, not due to a bad test).