Rotation Limiter?

[abbott567]

hey-
i am using the code

a1 = eye._y-_ymouse;
b1 = eye._x-_xmouse;
angleA1 = Math.atan2(a1, b1);
degrees1 = angleA1/(Math.PI/180);
setProperty ("eye", _rotation, degrees1);

and this makes my eye follow the mouse through 360 degrees and works fine.

however - on a different page unrelated to this one...
is there a way i can set a limiter on the angle so that it will only rotate through maybe 90

i want to have my character point to a board when u scroll down each menu button on the board - i literally want his hand to point from the top of the board to the bottom as you move down it but i dont want his hand to follow the cursor unless the pointer is actually over the menu selections on the board - if you get me...

i can only get his arm to do complete rotations which looks stupid when you have the mouse behind him

thanks in advance

 

[kennethkawamoto]

setProperty" is Flash 4 - what version of Flash are you using?

Anyway, you can use "if" statement:
[tt]
if(angleA1 > Math.PI*5/8 && angleA1 < Math.PI*7/8){
eye._rotation = angleA1*180/Math.PI;
}
[/tt]

Kenneth Kawamoto

http://www.materiaprima.co.uk

 

[abbott567]

im using flash 8 lol
im not very fluent in flash coding!

that if function works - however as ive never seen it done i am unsure exactly how to set my angles

what is the 5/8 and the 7/8 - ive sussed if i play around with these i can change the angle it moves through - however i want it to go from about 2oclock to about 4 oclock and i cant seem to figure it out

thanks for any help!

 

[kennethkawamoto]

Sorry Math.PI*5/8 and Math.PI*7/8 were just examples - I didn't know exactly what angles you were talking about

Try Math.PI/4 and -Math.PI/4 - these are more like angles you want.

Kenneth Kawamoto

http://www.materiaprima.co.uk

 

[abbott567]

Still cant get 2 and 4 oclock lol
it dont actually understand what is going on - im just punching in numbers and hoping it will work - but to no avail

i can get from 12 oclock to 3oclock (which is as close as i can get) using

a1 = eye._y-_ymouse;
b1 = eye._x-_xmouse;
angleA1 = Math.atan2(a1, b1);
degrees1 = angleA1/(Math.PI/180);
if(angleA1 > Math.PI/2 && angleA1 < Math.PI/1){
eye._rotation = angleA1*180/Math.PI;
}

 

[kennethkawamoto]

If those are 12 o'clock and 3 o'clock, what you want would be:
[tt]if(angleA1 > Math.PI*3/4 || angleA1 < -Math.PI*3/4)[/tt]

Kenneth Kawamoto

http://www.materiaprima.co.uk

 

[abbott567]

your a legend mate!
thank you so much!

i wish i could understand WHY that code works
however right now im not that bothered so long as it does haha

many many thanks!