Change how rounding on Y ticks happens - now it relies on shown Y range

graphs/gui/canvasPanel.py

@@ -188,6 +188,7 @@ class GraphCanvasPanel(wx.Panel):
             if minX is not None and maxX is not None:
                 minY = min(allYs, default=None)
                 maxY = max(allYs, default=None)
+                yDiff = (maxY or 0) - (minY or 0)
                 xMark = max(min(self.xMark, maxX), minX)
                 # If in top 10% of X coordinates, align labels differently
                 if xMark > canvasMinX + 0.9 * (canvasMaxX - canvasMinX):
@@ -214,7 +215,12 @@ class GraphCanvasPanel(wx.Panel):
                 def addYMark(val):
                     if val is None:
                         return
-                    rounded = roundToPrec(val, 4)
+                    # Round according to shown Y range - the bigger the range,
+                    # the rougher the rounding
+                    if yDiff != 0:
+                        rounded = roundToPrec(val, 4, nsValue=yDiff)
+                    else:
+                        rounded = val
                     # If due to some bug or insufficient plot density we're
                     # out of bounds, do not add anything
                     if minY <= val <= maxY or minY <= rounded <= maxY:

gui/utils/numberFormatter.py

@@ -99,12 +99,15 @@ def formatAmount(val, prec=3, lowest=0, highest=0, currency=False, forceSign=Fal
     return result
 
 
-def roundToPrec(val, prec):
+def roundToPrec(val, prec, nsValue=None):
+    """
+    nsValue: custom value which should be used to determine normalization shift
+    """
     # We're not rounding integers anyway
     # Also make sure that we do not ask to calculate logarithm of zero
     if int(val) == val:
         return int(val)
-    roundFactor = int(prec - getNormalizationShift(val) - 1)
+    roundFactor = int(prec - math.floor(math.log10(abs(val if nsValue is None else nsValue))) - 1)
     # But we don't want to round integers
     if roundFactor < 0:
         roundFactor = 0
@@ -116,16 +119,6 @@ def roundToPrec(val, prec):
     return val
 
 
-def getNormalizationShift(val):
-    """
-    Given a value, return how many positions to the left we should shift
-    decimal separator to get number in range of [1, 10)
-    """
-    if val == 0:
-        return None
-    return math.floor(math.log10(abs(val)))
-
-
 def roundDec(val, prec):
     if int(val) == val:
         return int(val)