Ring of range? (For spells)

You know in some games when you are going to cast spells you get like a ring that shows the maximum range of the spell. Is their like an easy way without importing models to do this?

Can't you use JASS to draw a circle around the unit (radius = range of spell) when the ability is clicked? If there is a graphics package available, I might add...

OR

Use a trigger that creates a small special effect / floating text at 30 degree intervals around the caster, at radius = range of selected spell. This should then trigger every time the ability button is clicked.

There is no event "going to cast spell".

You are right DioD thought it were an event like that.