Other [Challenge] Who will be able to simulate a rubber band?

[LucaMs]

I do not need it, but I'm curious and this seems like a good challenge (between you ).

The winner will get... my respect

 

[LucaMs]

It's hard, I knew

 

[LucaMs]

Paint.Net:

If you could realize the same, then you could realize the elastic effect.

 

[LucaMs]

Mumble...mumble...
Canvas has not a DrawArc, which we need.

 

[LucaMs]

Mumble...mumble...
Canvas has not a DrawArc, which we need.

Android Canvas seems to have DrawArc (B4A?)
http://developer.android.com/reference/android/graphics/Canvas.html#drawArc(android.graphics.RectF, float, float, boolean, android.graphics.Paint)

P.S.
... but there are always the excellent @Informatix' libraries .
[Lib] Accelerated surface

 

[LucaMs]

DrawArc is not useful. Maybe you should use Path (CubitTo?)

 

[derez]

The line drawn should be made of sine wave, the length is of int of half cycles (ie: 0.5, 1,1.5 ...).
The selected wave is the result of where the band is pinched, if in the middle it will be one half cycle.

 

[LucaMs]

The line drawn should be made of sine wave, the length is of int of half cycles (ie: 0.5, 1,1.5 ...).
The selected wave is the result of where the band is pinched, if in the middle it will be one half cycle.

???

 

[derez]

Rubber band works like a string. It has a main mode of movement and also secondary (harmonics).
I'm just helping those who may take the challenge.
The amplitude is harmonic (behaves like a sine function) and decays in time.

 

[sorex]

I don't see a match with a rubber band (tyre) and the animation above tho.

 

[Informatix]

Paint.Net:
View attachment 40803

If you could realize the same, then you could realize the elastic effect.

This kind of effect is usually done with Bezier curves for the drawing and an interpolator for the animation. libGDX offers everything needed in its Math package.

 

[LucaMs]

I don't see a match with a rubber band (tyre) and the animation above tho.

I'm not able to draw what I mean

The same effect of a guitar string (but not of metal, of rubber)?

This kind of effect is usually done with Bezier curves for the drawing and an interpolator for the animation. libGDX offers everything needed in its Math package.

Perhaps 2 animations? ("Down"-"Up"-Delay)

Well, this is a challenge for us. I was not able to use Accelerated Surface (perhaps I will post my beautiful attempt in the right thread).


Thank you, guys.

 

[Informatix]

I was not able to use Accelerated Surface

It's something to do with libGDX. With other libraries, it's a complete waste of time. LibGDX has everything needed: elastic interpolator, Box2D for physics simulation, Bezier class...

 

[LucaMs]

It's something to do with libGDX. With other libraries, it's a complete waste of time. LibGDX has everything needed: elastic interpolator, Box2D for physics simulation, Bezier class...

I understand. I wrote:

I was not able to use Accelerated Surface

just to say:
"I am not even been able to..."