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Custom easing functions in transition.to Started by david.hunt15 Oct 26 2014 06:19 PM

4 replies to this topic

Best Answer Vince_ , 29 October 2014 - 06:59 PM

http://www.webdevils.com/corona-more-easing-types/

Hey David, I'm on my phone so it's hard to go into detail but that's how the easingx.lua library is supposed to work.

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#1

david.hunt15

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david.hunt15
• Contributor

• 143 posts
• Corona SDK

Hi,

transistion.to is great and the out of the box easing function are great also..

However, out of the preset ones i can't quite get the effect I want. After reading the docs here:

http://docs.coronalabs.com/api/library/easing/index.html

it mentions the built in ones are based on Robert Penner's easing functions

I had a play on the function generator and came up with a couple that suit my needs better.

I had a play trying to get a custom one working but im not sure what my function needs to accept and return to get it to work.

This is a function as generated from the link above:

```function(t, b, c, d) {
var ts=(t/=d)*t;
var tc=ts*t;
return b+c*(tc*ts + -5*ts*ts + 10*tc + -10*ts + 5*t);
}
```

so in corona speak I thought I could just do this:

```-- approx conversion
local function myEasing(t, b, c, d)
local ts=(t/d)*t
local tc=ts*t
return b+c*(tc*ts + -5*ts*ts + 10*tc + -10*ts + 5*t)
end

transition.to( target, { transition=myEasing } )
```

Is there some documentation anywhere that i've missed? if not, has anybody got a working example so i can see how custom ones are created?

thanks!

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#2

Vince_

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Vince_
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I haven't played with custom easing myself but I did come across this library a while back. It might give you some insight on how custom easing is achieved.

easingx.lua

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#3

david.hunt15

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david.hunt15
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• Corona SDK

Hi Vince,

I appreciate the reply but I don't think that is what im looking for.

I want to be able to use the built in corona transition.to  but just point the tranisition parameter to my own funciton.

I think this is a question for corona staff as they can see how the method for say "inBounce" looks and the parameters it accepts and returns.

Once i know that, i should be able to put my own formula in

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#4

Vince_

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Vince_
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http://www.webdevils.com/corona-more-easing-types/

Hey David, I'm on my phone so it's hard to go into detail but that's how the easingx.lua library is supposed to work.

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#5

Rob Miracle

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Rob Miracle
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why not put a print inside the easing function and make sure you are getting the values expected passed in.

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