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Create a new zoom region for the magnifier. The new region is initially 'unmanaged'; that is, it is not associated with a particular sub-region of the "source" display. - Parameters:
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| zx,: | the scale factor in the x direction for the new zoom region |
| zy,: | the scale factor in the y direction for the new zoom region |
| ROI,: | the initial ROI of the zoom region. RectBounds of negative width/height indicates that the zoom region has no initial ROI. |
| viewport,: | the initial bounds of the ZoomRegion's viewport, in the target display coordinate system. |
- Returns:
- the newly created ZoomRegion.
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