def auto_bind(self, expression, mark):
type = expressions.typeof(expression)
position = as_position(expression)
size = expressions.typeof(position).size
for i in range(size):
item = position[i]
type = md.typeof(item)
index = self.create_axis(type)
if index is not None:
mark["position"][index].bind(item)
self.binding_changed(mark)
def as_position(expression):
type = expressions.typeof(expression)
if md.is_position_type(type):
result = expression
elif md.is_location_type(type):
result = md.Position[3](expression.longitude, expression.latitude, expression.altitude)
elif type in [md.Integer, md.Decimal, md.Interval]:
result = md.Position[1](expression)
else:
result = md.layout_grid[2](expression)
return result