Best approach for "shaking" my display group?

Getting Started Newbie Questions
#21

Heh, that’s cool! Didn’t follow this thread but I’m going to be writing my shake as easing from now on as well.

#22

Antheor, this doesn’t work for more than one direction, you have to start each direction separately.

You could start one transistion for both x and y, but that’s probably not what you want. It will shake diagonally.

But it works for alpha and scaling.

#23

I do 

oscillate( f, a, 'x', time ) (obj) oscillate( f, a, 'y', time ) (obj) 

I have indeed diagonally shake … but it’s cool enough :slight_smile:

What do you mean by ‘it works for alpha and scaling’ ?

#24

Try this, it’s supereasy and works like a charm:

local square = display.newRect(768,1024,100,100) local shakeEasing = function(currentTime, duration, startValue, targetDelta) local shakeAmplitude = 100 -- maximum shake in pixels, at start of shake local timeFactor = (duration-currentTime)/duration -- goes from 1 to 0 during the transition local scaledShake =( timeFactor\*shakeAmplitude)+1 -- adding 1 prevents scaledShake from being less then 1 which would throw an error in the random code in the next line local randomShake = math.random(scaledShake) return startValue + randomShake - scaledShake\*0.5 -- the last part detracts half the possible max shake value so the shake is "symmetrical" instead of always being added at the same side end -- shakeEasing transition.to(square, {time = 1000, x = square.x, y = square.y, transition = shakeEasing})
#25

Johannes, your solution is quite elegant. I tried to shake both ‘x’ and ‘y’ but passing ‘xy’ or ‘x,y’ does not work…

#26

Heh, that’s cool! Didn’t follow this thread but I’m going to be writing my shake as easing from now on as well.

#27

Antheor, this doesn’t work for more than one direction, you have to start each direction separately.

You could start one transistion for both x and y, but that’s probably not what you want. It will shake diagonally.

But it works for alpha and scaling.

#28

I do 

oscillate( f, a, 'x', time ) (obj) oscillate( f, a, 'y', time ) (obj) 

I have indeed diagonally shake … but it’s cool enough :slight_smile:

What do you mean by ‘it works for alpha and scaling’ ?

#29

Try this, it’s supereasy and works like a charm:

local square = display.newRect(768,1024,100,100) local shakeEasing = function(currentTime, duration, startValue, targetDelta) local shakeAmplitude = 100 -- maximum shake in pixels, at start of shake local timeFactor = (duration-currentTime)/duration -- goes from 1 to 0 during the transition local scaledShake =( timeFactor\*shakeAmplitude)+1 -- adding 1 prevents scaledShake from being less then 1 which would throw an error in the random code in the next line local randomShake = math.random(scaledShake) return startValue + randomShake - scaledShake\*0.5 -- the last part detracts half the possible max shake value so the shake is "symmetrical" instead of always being added at the same side end -- shakeEasing transition.to(square, {time = 1000, x = square.x, y = square.y, transition = shakeEasing})
#30

@johannes_lalala

Thanks for sharing, it works great!

#31

@johannes_lalala

Thanks for sharing, it works great!

#32

I have a question regarding tweaking the existing Easing Functions, but it would have taken this thread off-topic so, I have asked it here:

http://forums.coronalabs.com/topic/56204-custom-easing-and-tweaking-existing-easing-functions/

#33

@johannes_lalala

Thanks for sharing, it works great!

#34

@johannes_lalala

Thanks for sharing, it works great!

#35

I have a question regarding tweaking the existing Easing Functions, but it would have taken this thread off-topic so, I have asked it here:

http://forums.coronalabs.com/topic/56204-custom-easing-and-tweaking-existing-easing-functions/