Consistently moving a unit in a specific direction

I've been doing some map/concept brainstorming, perhaps a bit on the over-idealistic side, and was wondering how one would go about doing the action stated in the thread's topic/title. That's to say, like, I hold the down arrow and my character runs directly south, stopping when they hit a wall.

I took a close look down on Blizzard's scenario map Azeroth Grand Prix to perhaps gain a better understanding of the action (in which your kart can move directly forward with the push/hold of a button and will impact walls, etc.)...but the meat of it is and was all but foreign to me.

Anyone have an idea/clues?

hWell. That'd be a Triggers and Scripts question, and as such I shall move it.

More pertainent to your question, you would need to set up 8 triggers. 2 to detetect when a player presses/releases the up key, 2 for the right key, etc.

Then, you'll have every player's "kart" in a parallel array to its owning player's player number (AKA: "Karts[8]" belongs to Player 8), and when a player triggers an event, you'll add his kart to a unit-group (and remove it when he depresses the key) and then set up forward/back triggers like so:
And turning triggers like so:
Obviously replacing all relevant math numbers with the appropriate ones for each direction.

Thank you very much. :)

But wouldn't a trigger firing off every 0.03 seconds of gametime absolutely destroy the system? @_@

Yes, windows will crash and your computer will catch fire.

For the 50000th time, the actions you do in the period of the trigger are what matters to speed. So, what your question should be is: doesnt moving alot of units around every 0.03 seconds slow down wc3.

Then the answer would be yes. Alot of units will slow it down, because it is using SetUnitPosition. This can be avoided by using SetUnitX / SetUnitY.

Stop. Relax. It was an inquiry posed in earnest.

Thanks for the answer itself, however.