RasterScan

class QPolargraph.patterns.RasterScan.RasterScan(*args, width=0.6, height=0.6, dx=0.0, dy=0.1, step=5, polargraph, **kwargs)

Bases: QScanPattern

Row-by-row raster scan pattern.

Overrides QScanPattern.vertices() to produce a zigzag path across the scan rectangle: odd columns scan top-to-bottom, even columns scan bottom-to-top.

vertices()

Return zigzag raster waypoints across the scan rectangle.

Return type:

ndarray

Returns:

numpy.ndarray – (nvertices, 2) array of (x, y) waypoints [m].

trajectory()

Return the actual raster path as a (2, npts) array for plotting.

Because the polargraph geometry is nonlinear, moving between two Cartesian waypoints traces a curve rather than a straight line. This method samples each segment at _TRAJECTORY_PTS points in step-index space and converts them back to Cartesian coordinates, giving an accurate picture of the true scan path.

Return type:

ndarray

Returns:

numpy.ndarray – (2, npts) array of (x, y) coordinates [m].