rotating NOT from the center of an actor

digitalzero

basically i have a robot that shoots lasers from his eyes... i would like to have the laser rotate not from the center but from the right of the laser because it would show that the laser is going from a 250 degree angle to a 180 degree angle... i have no idea how to do this and im just looking for a little help...

ORBZ

math:

laser.x = eye.x + cos(eye.angle) * laser.length / 2
laser.y = eye.y + sin(eye.angle) * laser.length / 2

digitalzero

what the hell is that LOL!! lol thanks so much though... im going to try to decipher this foreign language lol

digitalzero

yeah @ORBZ i dont get that at all... im trying to make sense of it but yeah i dont understand

The_Gamesalad_Guru

I think what your looking for is an offset formula so it rotates on the end of the laser actor. I think @Orbz is assuming you're rotating the eye too. If you are his formula will work.

ORBZ

http://orbz.com/gamesalad-demos/Trig 101.zip

ORBZ

Constrain the xy position of the laser to those formulas.

RThurman

Maybe something like this?
http://www.mediafire.com/download/dhu529yp886s4c3/LaserEye.zip

DeadlySeriousMedia

I love how casual this opening sentence is:

basically i have a robot that shoots lasers from his eyes...

Naturally. )

digitalzero

@FryingBaconStudios THATS EXACTLY WHAT IM NEEDING... you know how in photoshop you can move the middle thing so that when you rotate it it rotates around the moving thing... wow that sounded horrible explaining wise... lol but ok basically picture yourself holding a spoon by the end of the handle and the angle is 270 degrees... now picture yourself moving the scoopy part up 180 degrees without moving your other hand... thats pretty much what im trying to do LOL yeah i know i have horrible examples lol. but thats pretty much it @RThurman and @ORBZ lol and @DeadlySeriousMedia... sometimes it be like that LOL

The_Gamesalad_Guru

Yeah do a forum search with rotation offset and rthurman he has a great formula. If I was on my Mac. I would post it..

DeadlySeriousMedia

@digitalzero Not sure what your game is about but it is reminding me of an idea I had to revamp my Zombie Unicorn game: OMGMFE! (Oh My God! My F#%@king Eyes!) A tale of a kid whose wish for laser vision goes horribly wrong.

tenrdrmer

http://forums.gamesalad.com/discussion/29037/free-yourselves-from-the-tyranny-of-center-only-rotations

@codewizard should add offset rotations to his list of behavior improvements. [-O<

digitalzero

@tenrdrmer that posting really helped me a lot... i suck sometimes because i dont know how to word most of this !@#$% so i usually just put in something like how my title is named lool

digitalzero

GOT IT THANKS TO @RThurman http://i1192.photobucket.com/albums/aa340/RAThurman/OffCenterRotation.png THANKS SO MUCH!!!

RThurman

@digitalzero -- if you are gonna use trig to rotate and place the laser beam -- I think you should use the following example. The equations you reference in the above post are a little old and can be done better by using the following example:
http://forums.gamesalad.com/discussion/comment/370605/#Comment_370605

digitalzero

@RThurman thanks so much i really appreicate it!

RThurman

@digitalzero -- you are welcome!

But before you use a bunch of trig, I'd suggest trying the method I mentioned earlier in this discussion. GameSalad is perfectly capable of doing the laser shooting stuff without you needing to use any sines and cosines. Here is the link for a demo of a trig-less laser shooter again:

http://www.mediafire.com/download/dhu529yp886s4c3/LaserEye.zip