Java-Gaming.org Hi !
Featured games (83)
games approved by the League of Dukes
Games in Showcase (539)
Games in Android Showcase (132)
games submitted by our members
Games in WIP (603)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  Simple steering behaviour vector help  (Read 1017 times)
0 Members and 1 Guest are viewing this topic.
Offline javac

Junior Newbie





« Posted 2007-10-12 13:57:58 »

Hi guys,

If i was to have a 2d pitch and wanted to move a player(circle) towards a target on the pitch, how would you program this behaviour?

desired_velocity = normalize (position - target) * max_speed
steering = desired_velocity - velocity

I have vectors for both position and velocity. Basically an object that holds a float for both x and y. How would I then go about writing this? Huh

Any help greatly appreciated,

Thanks
Offline broumbroum

Junior Devvie





« Reply #1 - Posted 2007-10-12 15:32:10 »

HI!
Sorry but I can't figure out your request. What do you mean with steering ? Is that a sort of Pathfinding ?

::::... :..... :::::: ;;;:::™ b23:production 2006 GNU/GPL @ http://b23prodtm.webhop.info
on sf.net: /projects/sf3jswing
Java (1.6u10 plz) Web Start pool
dev' VODcast[/ur
Offline SimonH
« Reply #2 - Posted 2007-10-12 15:39:48 »

Is this what you need: http://workshop.evolutionzone.com/old/2003spring/vector_maths.html?

People make games and games make people
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline dishmoth
« Reply #3 - Posted 2007-10-12 15:46:06 »

Looks like you're pretty close to the answer already!  You should use "normalize(target - position)" though (rather than "position - target") so that the player moves towards the target, not away from it.

The player then accelerates in the direction of your "steering" vector.  For this you'd write something like
velocity = velocity + acceleration * normalize(steering)
where "acceleration" is the amount by which the player's velocity can change in one turn.

Be warned that this approach may have some odd side-effects!  In particular, the player may go into orbit around the target!  With a bit of experimentation (and, possibly, some friction) you should be able to make it do what you want though.

I hope that's some help.  Apologies if I misunderstood your question.

Simon

Offline javac

Junior Newbie





« Reply #4 - Posted 2007-10-12 16:14:21 »

Yes! Thank you!!

I stumbled on through and managed to knock up all of the vector maths for my classes and got the seek behaviour to work. I was so confused as to why it wasn't working as I thought it should. Read your post and realised I was taking away the wrong one lol. Position - target was the problem.

Thanks so much, you just made me a very happy steering behaviour enthusiast  Cool


P.s thanks again Smiley
Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

rwatson462 (35 views)
2014-12-15 09:26:44

Mr.CodeIt (26 views)
2014-12-14 19:50:38

BurntPizza (53 views)
2014-12-09 22:41:13

BurntPizza (86 views)
2014-12-08 04:46:31

JscottyBieshaar (48 views)
2014-12-05 12:39:02

SHC (62 views)
2014-12-03 16:27:13

CopyableCougar4 (64 views)
2014-11-29 21:32:03

toopeicgaming1999 (126 views)
2014-11-26 15:22:04

toopeicgaming1999 (116 views)
2014-11-26 15:20:36

toopeicgaming1999 (34 views)
2014-11-26 15:20:08
Resources for WIP games
by kpars
2014-12-18 10:26:14

Understanding relations between setOrigin, setScale and setPosition in libGdx
by mbabuskov
2014-10-09 22:35:00

Definite guide to supporting multiple device resolutions on Android (2014)
by mbabuskov
2014-10-02 22:36:02

List of Learning Resources
by Longor1996
2014-08-16 10:40:00

List of Learning Resources
by SilverTiger
2014-08-05 19:33:27

Resources for WIP games
by CogWheelz
2014-08-01 16:20:17

Resources for WIP games
by CogWheelz
2014-08-01 16:19:50

List of Learning Resources
by SilverTiger
2014-07-31 16:29:50
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!