pin

def get_absolute_point(self, widget_point):
    ''' Returns a point with the view transformations of a point in the
        widget reverted '''
    x, y = self.offset

    px, py = widget_point
    px /= self.get_allocated_width()
    py /= self.get_allocated_height()

    magw = self.get_magnified_width()
    magh = self.get_magnified_height()

    x, y = x + px * magw, y + py * magh

    rotation = self.get_rotation()
    if rotation:
        x, y = spin_point(x, y, rotation / 180 * math.pi * -1)

    hflip, vflip = self.get_flip()
    if hflip:
        x *= -1
    if vflip:
        y *= -1

    return (x, y)

def get_pin(self, widget_point=None):
    ''' Gets a pin for readjusting the view to a point in the widget
        after any transformations '''
    w, h = self.get_allocated_width(), self.get_allocated_height()
    if not widget_point:
        widget_point = w / 2, h / 2

    absolute_point = self.get_absolute_point(widget_point)

    px, py = widget_point
    px /= w; py /= h
    scalar_point = px, py

    return absolute_point, scalar_point

def adjust_to_pin(self, pin):
    ''' Adjusts the view so that the same widget point in the pin can be
        converted to the same absolute point in the pin '''
    (x, y), (px, py) = pin

    hflip, vflip = self.get_flip()
    if hflip:
        x *= -1
    if vflip:
        y *= -1

    rotation = self.get_rotation()
    if rotation:
        x, y = spin_point(x, y, rotation / 180 * math.pi)

    magw = self.get_magnified_width()
    magh = self.get_magnified_height()

    x -= px * magw
    y -= py * magh

    self.adjust_to(x, y)