In this example we demonstrate how to mask certain areas on the detector image to exclude their influence on the fitting procedure. This can be done by invoking the method addMask on a simulation object.
simulation = ScatteringSimulation()
simulation.addMask(Rectangle(x1, y1, x2, y2), mask_value)
where Rectangle is related to the shape of the mask in detector coordinates, mask_value can be either True (area is excluded from the simulation and fit) or False (area will stay in the simulation and will be taken into account in $\chi^2$ calculations during the fit). There can be an arbitrary number of masks of various shapes added to the simulation one after another. Each subsequent mask overrides the previously defined mask_value in the given area.
Fit window
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