How to make units autocast?

[Shadow_Master]

Hii
In some maps (like Legion TD, Warcraft TD) are units which can cast spells automatically

Example:
Legion TD - The King is casting Shockwave
Warcraft TD - Bloodmages is casting Flamestrike

I'd like to know how that does work. Hope u can help me... :]

 

[MortAr]

Detect when a unit is attacked by the specified tower and instead of continue attacking order it to cast a spell.

 

[Fjury]

• Test
  • Events
    • Unit - A unit is attacked
  • Conditions
    • Unit-type of Attacking unit is equal to <TOWER>
  • Actions
    • Unit - Issue unit to cast spell Tauren Cheiftain - Shockwave

I'm at work atm. and have made this by my knowlegde, so I'm not sure if the text looks like my try in the world editor.

It looks wierd, but I hope that you can understand it.

EDIT: Notice that this was a example for this 'King tower'

Example:
Legion TD - The King is casting Shockwave