Some tweening questions by a tween noob

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n00bstar

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Location: Montreal, Canada.

Posted: 28th Aug 2021 20:42

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I've never really played with tweens befoer and got around to noodling around with them this week and I can definitely see a million fun applications for them. I've toyed with them a bit, read the documentation and I think I got most of it. I've got two questions that I didn't find a hint for in the help file:

1) Are tween coordinates always absolute or is there a way to make them dynamic? For example: SetTweenSpriteX(tweenID, 0,200,0), 0 and 200 are absolute values. This would move my sprite from 0 to 200. But if my sprite was at 150, it wouldn't move it 150 > 350, it would still move it 0 > 200. I haven't found any way to make tweens dynamic. Well I mean.. I can just create a tween on the fly when I need it I guess, then all my Get commands would return current data.. but any way to pre-define such tweens?

2) Is there a way to loop a tween? or a chain? Seems to me it would be useful.

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PartTimeCoder

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Posted: 28th Aug 2021 21:08

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1. I am pretty sure Tween coords are world coords, you can make them dynamic or local with :

function spriteToWorldX(spr,x#,y#)

rem get sprite data

a# = getSpriteAngle(spr)

ox# = getSpriteXbyOffset(spr)

rem get display data

dw# = getVirtualWidth()

dh# = getVirtualHeight()

aspect# = (dw# / dh#)

if aspect# = 1.0

scaleX# = getSpriteWidth(spr)/100.0

aspect# = getDisplayAspect()

scaleY# = scaleX# * aspect#

else

aspect# = 1.0

i = getSpriteImageID(spr)

scaleX# = getSpriteWidth(spr)/getImageWidth(i)

scaleY# = getSpriteHeight(spr)/getImageHeight(i)

endif

rem calculate value

dx# = cos(a#) * (x# * scaleX#) - sin(a#) * (y# * scaleY#)

wx# = ox# + dx#

endfunction wx#
function spriteToWorldY(spr,x#,y#)

rem get sprite data

a# = getSpriteAngle(spr)

oy# = getSpriteYbyOffset(spr)

rem get display data

dw# = getVirtualWidth()

dh# = getVirtualHeight()

aspect# = (dw# / dh#)

if aspect# = 1.0

scaleX# = getSpriteWidth(spr)/100.0

aspect# = getDisplayAspect()

scaleY# = scaleX# * aspect#

else

aspect# = 1.0

i = getSpriteImageID(spr)

scaleX# = getSpriteWidth(spr)/getImageWidth(i)

scaleY# = getSpriteHeight(spr)/getImageHeight(i)

endif

rem calculate value

dy# = sin(a#) * (x# * scaleX#) + cos(a#) * (y# * scaleY#)

wy# = oy# + dy# * aspect#

endfunction wy#

+ Code Snippet

function spriteToWorldX(spr,x#,y#)

       rem get sprite data

       a# = getSpriteAngle(spr)

       ox# = getSpriteXbyOffset(spr)

       

       rem get display data

       dw# = getVirtualWidth()

       dh# = getVirtualHeight()

       aspect# = (dw# / dh#)

       if aspect# = 1.0

               scaleX# = getSpriteWidth(spr)/100.0

               aspect# = getDisplayAspect()

               scaleY# = scaleX# * aspect#

       else

               aspect# = 1.0

               i = getSpriteImageID(spr)

               scaleX# = getSpriteWidth(spr)/getImageWidth(i)

               scaleY# = getSpriteHeight(spr)/getImageHeight(i)

       endif

       

       rem calculate value

       dx# = cos(a#) * (x# * scaleX#) - sin(a#) * (y# * scaleY#)

       wx# = ox# + dx#

endfunction wx#
function spriteToWorldY(spr,x#,y#)

       rem get sprite data

       a# = getSpriteAngle(spr)

       oy# = getSpriteYbyOffset(spr)

       

       rem get display data

       dw# = getVirtualWidth()

       dh# = getVirtualHeight()

       aspect# = (dw# / dh#)

       if aspect# = 1.0

               scaleX# = getSpriteWidth(spr)/100.0

               aspect# = getDisplayAspect()

               scaleY# = scaleX# * aspect#

       else

               aspect# = 1.0

               i = getSpriteImageID(spr)

               scaleX# = getSpriteWidth(spr)/getImageWidth(i)

               scaleY# = getSpriteHeight(spr)/getImageHeight(i)

       endif

   

       rem calculate value

       dy# = sin(a#) * (x# * scaleX#) + cos(a#) * (y# * scaleY#)

       wy# = oy# + dy# * aspect#

endfunction wy#

^^ from UCF project: https://forum.thegamecreators.com/outbound?url=https%3A%2F%2Fforumfiles.thegamecreators.com%2Fdownload%2F2334782

2. not sure, I will be looking at soon, I think it might be a case of checking if the tween has finished and play it again

Am going to use this in my CodeJam project but knee deep in GIMP at mo... and being a man I cant multitask...LOL

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Scraggle

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Posted: 29th Aug 2021 14:07

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1. Tweens are absolute you would have to make it on the fly. You could create a function that would do it for you based on the current values though.
2. There's no auto loop (shame really - it would be useful) but you can check to see if a tween has stopped playing and restart it if it has.

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n00bstar

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Posted: 2nd Sep 2021 23:41

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Aye that's what I ended up doing, I just gather all the info I need for my tween and create it right before using it. Feels a bit counter intuitive to me, but it's easy to work around it at least. Still though, it seems to me that dynamic tweens could be super useful.

Quote: "Am going to use this in my CodeJam project but knee deep in GIMP at mo... and being a man I cant multitask...LOL"

Sure you can. You can multitask, just....one task at a time, that's all. I call it sequential multitasking.

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