Variable springs

[maxovitsj]

Hello,

I am new to Algodoo.
I've been playing around for a while and was wondering if its possible to make a spring thats variable.
With that i mean that for example when i press the up arrow on my keyboard the spring increases in length.
And when i press down arrow it decreases.

Thanks in advance

Max

[Sonic]

No sorry. I think it's impossible.

[RicH]

It's possible. Get a motor and attach to it 2 boxes with different on-collide codes(one to increase and one to decrease the variable). Now, just set it up so when you press up, only one box would hit and change the variable. Just that concept.

[maxovitsj]

link to pic: http://i41.tinypic.com/s6re45.jpg

Ok so i made that "wheel" that collides with the boxes and then it does what it supposed to
only thing is that i have to keep pressing enter in the "Length" box for the spring otherwise it doesnt move.
I checked the console for Scene.My.Var and that changes.

Thanks in advance.

Max

[RicH]

Type {scene.my.var} instead of scene.my.var.
I found it had a difference.

[Mystery]

No sorry. I think it's impossible.

Shut up.

Rich is correct, you need to add some braces ( { } ) around the variable

Also note you can also change the oncollide code to

Code: Select all

scene.my.var = scene.my.var + 0.5

And every time it is hit the spring will increase in length 0.5

Or you can have fun with thing like

Code: Select all

scene.my.var = sim.time *0.1

Which will make the spring longer at the rate of time but such code if better used with a laser.

[RicH]

I think he wants it just to be set to predefined lengths. If not then:
http://i39.tinypic.com/10n7y91.png
You could also use gears.

[Mystery]

i press the up arrow on my keyboard the spring increases in length.
And when i press down arrow it decreases.

I would say a set up more like this would be better- http://i43.tinypic.com/10wtft3.jpg

[RicH]

Oh right, we have lasers nao.

[KarateBrot]

Type {scene.my.var} instead of scene.my.var.
I found it had a difference.

the reason is that { } brackets tell algodoo it's a variable and not only a constant.

[RicH]

Ah, okay.

[maxovitsj]

Adding the { } to the spring's Length box works perfectly =D
thanks

@Mystery, how do you get the laser box to look like that o.0

[Mystery]

I was testing the latest beta.
Its an open beta so feel free to download it.
viewtopic.php?f=24&t=1701