It doesn't do much yet, but I'm planning on XML import/export. I keep the export functionality separated from the rest of my code, so you can easily add CSV support yourself.
You can now drag a "handle" to the side of the screen and it will start scrolling in that direction. Very handy when working on large splines with loads of detail.
Update: Just made the entire view menu functional. You can switch between XY, YX and XZ view-planes, zoom in/out, show/hide the tangents and reset the camera of the viewport. If I can keep going at this rate, I will be done next weekend.
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