Vector to angle question.

The_Gamesalad_Guru

Okay so I'm a wiz at logic but I suck at vector math. I have an actor that rotates 360*. I have a second actor attached to it with an offset. I need the attached object to move with the main object as it rotates. Thanxs in advance to the math wiz!

jonmulcahy

I'm sure someone will post something sooner. But I have code for this at home. Ill post it tonight

Braydon_SFX

The attached actor moves (with offset) and rotates with the first actor?

LumpApps

In the orbitting actor:
constrain selfposition.X to
mainactor position X + (offset * cos(angle.mainactor))

constrain selfposition.Y to
mainactor position Y + (offset * sin(angle.mainactor))

Hope that helps. It came out my head so not sure if I made a mistake

edit: if you want the orbiting actor to rotate too simply constrain its rotation to the rotation of the main actor (add a value like for example +45 if the initial is incorrect)

edit2: Turned around the cos and sin

The_Gamesalad_Guru

@LudwigHeijden Will test it out. At first clance it looks correct.

LumpApps

Else download my helping tool, its all in there: http://forums.gamesalad.com/discussion/38780/free-sin-and-cos-tool-for-cool-movements-free/p1

The_Gamesalad_Guru

Close it works but goes the opposite way...lol Oh I have that already. Totally had a brain fart about that!

LumpApps

LOL

The_Gamesalad_Guru

ahhh still not working right. It's not implimenting the offset. the X offset is 0. it's the Y I have +130 pixels

LumpApps

With offset you mean radius right?

The_Gamesalad_Guru

I think you had the sin and cos right the first time. I switched them back after looking at another formula I had. It works but when the main actor moves clockwise the second one moves counter clockwise.

LumpApps

You will love this one: (see attachment)

The_Gamesalad_Guru

Ah will look but I figured it.. Yaaaa good for the vector math dunce #:-S

Here it is

Actor one X - magnitude (OffsetX,OffsetY)*sin((Actor.one.Rotation)-atan(offsetX/offsetY))

Actor one Y + magnitude (OffsetX,OffsetY)*cos((Actor.one.Rotation)-atan(offsetX/offsetY))

Now on to the next puzzle but I think I have that formula getting it to move in that vector lane up and down.

RThurman

@FryingBaconStudios -- I'd suggest using the equations in @LudwigHeijden's demo instead of the ones you posted. I feel kinda responsible for the equations you posted. I suggested those equations when I was a young pup. But they are not as generalizable as Ludwig's.

I thought I had put something like this in the "Spare Code" discussion. But I can't find it there. Here it is. The 'code' is comparable to Ludwigs. But my graphics are not nearly as nice.

http://www.mediafire.com/download/zpgd9040t34z3be/FerrisWheel.zip