def computeSlop(self, step, divisor):
        """Compute the slop that would result from step and divisor.

        Return the slop, or None if this combination can't cover the full
        range. See chooseStep() for the definition of "slop".

        """
        bottom = step * math.floor(self.minValue / float(step) + EPSILON)
        top = bottom + step * divisor

        if top >= self.maxValue - EPSILON * step:
            return max(top - self.maxValue, self.minValue - bottom)
        else:
            return None
Compute the slop that would result from step and divisor.

        Return the slop, or None if this combination can't cover the full
        range. See chooseStep() for the definition of "slop".

        
graphite_api/render/glyph.py