when 'up'
style.top = 21 - connector_radius - connector_slant
when 'down'
style.top = 21 - connector_radius + connector_slant
when 'bot'
when 'up'
style.top = 21 - connector_radius - connector_slant
when 'down'
style.top = 21 - connector_radius + connector_slant
when 'bot'