created a file with pyqtgraph subclasses

pyqtgraph_sublasses.py

+from pyqtgraph import ROI
+
+
+
+class CustomRectangularROI(ROI):
+    """
+    Rectangular ROI subclass with a single scale handle at the top-right corner.
+    
+    ============== =============================================================
+    **Arguments**
+    pos            (length-2 sequence) The position of the ROI origin.
+                   See ROI().
+    size           (length-2 sequence) The size of the ROI. See ROI().
+    centered       (bool) If True, scale handles affect the ROI relative to its
+                   center, rather than its origin.
+    sideScalers    (bool) If True, extra scale handles are added at the top and 
+                   right edges.
+    \**args        All extra keyword arguments are passed to ROI()
+    ============== =============================================================
+    
+    """
+    def __init__(self, pos, size = [8, 8], centered=False, sideScalers=False):
+
+        #ROI.__init__(self, pos, size, **args)
+        super().__init__(pos, size, centered, sideScalers)          
+        ## handles scaling horizontally around center
+        self.addScaleHandle([1, 0.5], [0.5, 0.5])
+        self.addScaleHandle([0, 0.5], [0.5, 0.5])
+
+        ## handles scaling vertically from opposite edge
+        self.addScaleHandle([0.5, 0], [0.5, 1])
+        self.addScaleHandle([0.5, 1], [0.5, 0])
+
+        ## handles scaling both vertically and horizontally
+        self.addScaleHandle([1, 1], [0, 0])
+        self.addScaleHandle([0, 0], [1, 1])
+
+
+        self.sigRegionChangeFinished.connect(self.correct_scaling)
+
+    def correct_scaling(self):
+        x, y = self.pos()[0], self.pos()[1]
+        print(x, y)
+        if x%8 != 0 or y%8 != 0:
+            self.setPos((x//8)*8, (y//8)*8)
+        
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