Motion Trampoline Function is glitchy? [SOLVED]

[sasquatchii]

I am using this motion function to animate a dog jumping up and down in my game.

However, it seems a bit glitchy, as when you click to get to the screen that the sprite is in, it flashes to the far left for a second before jumping up and down like it's supposed to. (The dog is originally a static sprite at the center of the screen, and it jumps up and down at the center of the screen like it's supposed to, but it flashing at the far left for a second is weird.) Does anyone have any ideas as to what I can do to fix this? Here is the code I'm using:

Code: Select all

init:
    python:
        import math
        def Trampoline(n):
            return (0.5, 1 - math.sin(math.pi * n), 0.5, 0)

play panting "music/laylapant.wav"
    
    show laylajump
    with moveinleft
    with vpunch
        
    n2 ""
    
    hide laylajump
    
    show screen quickmenu
    
    show casey surprised
    
    show laylajump2 at Motion(Trampoline, 3.4, repeat=True, bounce=True)

I should mention that I cut out the label start and any other code I thought was irrelevant.
Any thoughts or ideas would be much appreciated!

EDIT:
After TheChris's suggestion, I went back and changed the code to ATL, and sure enough, it worked without a hitch! Here's what I ended up using:

Code: Select all

transform move_slide:
    xalign 0.5 yalign 0.0
    linear 0.6 yalign 0.6
    linear 0.6 yalign 0.0
    repeat

[TheChris]

I see what you mean. It briefly appears right in the top left hand corner for me too. Why don't you try using ATL like the top of the "motion" page suggest?

[sasquatchii]

I see what you mean. It briefly appears right in the top left hand corner for me too. Why don't you try using ATL like the top of the "motion" page suggest?

Whoa, I didn't even think about ATL (total coding dummy over here, in case you couldn't tell)!

But I tried it, and it totally worked!! Thank you for suggesting it

[Donmai]

Here's what I ended up using:

Code: Select all

transform move_slide:
    xalign 0.5 yalign 0.0
    linear 0.6 yalign 0.6
    linear 0.6 yalign 0.0
    repeat

Just a suggestion: to simulate gravity effect, try using easein and easeout.

Code: Select all

transform move_slide:
    subpixel True
    xalign 0.5 yalign 0.0
    easeout 0.6 yalign 0.6
    easein 0.6 yalign 0.0
    repeat

[sasquatchii]

Here's what I ended up using:

Code: Select all

transform move_slide:
    xalign 0.5 yalign 0.0
    linear 0.6 yalign 0.6
    linear 0.6 yalign 0.0
    repeat

Just a suggestion: to simulate gravity effect, try using easein and easeout.

Code: Select all

transform move_slide:
    subpixel True
    xalign 0.5 yalign 0.0
    easeout 0.6 yalign 0.6
    easein 0.6 yalign 0.0
    repeat

Thank you for this, I put this into the code and am so thrilled with the results This is such a small detail but really makes a HUGE difference!