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# [VB] Simple AI System (Follow Player)?

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2 replies to this topic

### #1mholmes  Members

Posted 01 November 2012 - 11:38 AM

Im going to make a side scroller very soon and Ive never made one before. Ive also never had to make a AI system before but I have ideas. Anyway, would I set the AI to follow the player based in their location via x,y location? Basicly make a timer to increate by 1 until x.location = player.x.location and y.location = player.y.location or somethig like that in vb .Net? Basicly I would need to store the players x,y in a class right?

### #2Tournicoti  Prime Members

Posted 03 November 2012 - 03:09 AM

To make the enemy follow the player you can do something like that :

1) Compute the direction the enemy must follow :
direction = normalize ( player - enemy )

2) Compute the new enemy position, according to some velocity :
enemy = enemy + direction * velocity

where :
direction, enemy, player are 2D vectors
velocity is a scalar

Hope it helps

Edited by Tournicoti, 03 November 2012 - 03:11 AM.

### #3wodinoneeye  Members

Posted 03 November 2012 - 10:24 PM

They stil have the sgn() function in BASIC dont they?

I remember using that function to move an object towards anothers coordinates ages ago (pre PC days)

sign of Target minus Initial - gives you a single step towards the target

dx = sgn( target.x - Self.x) ........... gets the 1 0 -1 value from the difference of the coordinate values
dy = sgn( target.y - Self.y)

Self.x = Self.x + dx ........... moves one step in direction towards target
Self.y = Self.y + dy

of course in those days there were no object/classe constructs (records ...aack!)

if the way is blocked, you would test that first and would need something else to figure how to go around

as long as the target stays on the map you dont have to test for x y map boundry -- but if you have a case where target exits (like levels) that will have to be handled specially

if you want it to 'follow' but not overlap the target you need to test if the result of the move will be the same coordinates as the target and stop the move

Edited by wodinoneeye, 03 November 2012 - 10:35 PM.

--------------------------------------------Ratings are Opinion, not Fact

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