vispy.geometry.isocurve.
isocurve
Generate isocurve from 2D data using marching squares algorithm.
2D numpy array of scalar values
The level at which to generate an isosurface
If False, return a single long list of point pairs If True, return multiple long lists of connected point locations. (This is slower but better for drawing continuous lines)
If True, extend the curves to reach the exact edges of the data.