Visual bug in http://www.zefrank.com/showcase/maya/index.html

[pgnj99]

Describe the bug

In the animation linked below, the planets are meant to orbit around the sun. Instead, they seem to all be stuck in the sun's position.
http://www.zefrank.com/showcase/maya/index.html

Ruffle.-.sun4.swf.2022-06-19.17-32-12.mp4

Expected behavior

Adobe.Flash.Player.32.2022-06-19.17-33-39.mp4

Affected platform

Desktop app

Operating system

Windows 10

Browser

No response

Additional information

No response

[Toad06]

Thanks for the report.

It seems like Ruffle has issues accessing some variables.
For instance, in \DefineSprite (16: ball)\frame 1\DoAction:

// Lines added for testing

if(_root.test == undefined) {
   _root.test = 1;
}
if(_root.test < 50) {
   trace(count);
   trace(eval(tar));
   trace(depth);
   trace(r);
   trace("");
   _root.test = _root.test + 1;
}


// Actual code

count = count + speed;
this._x = eval(tar)._x + Math.cos(count) * r;
this._y = eval(tar)._y + Math.sin(count) * 4;
this._xscale = (Math.sin(count) + 3) / 2 * 50;
this._yscale = (Math.sin(count) + 3) / 2 * 50;
prev = Math.cos(count);
depth = Math.round(400 + Math.sin(count) * r) + 5;
if(depth == 400) {
   depth = 401;
}
this.swapDepths(depth);
moon.gotoAndStop(41 - Math.floor((Math.sin(count) + 1) * 20));

Flash Player traces on the first iteration (test == 1):

-6.28318530717959
_level0.instance4700.planet.sun
undefined
101 (random number)

Flash Player traces on the last iteration (test == 49):

-0.997197551196598
_level0.instance4700.planet.sun
141
314

Ruffle traces on the first iteration:

undefined
undefined
undefined
undefined

Ruffle traces on the last iteration:

0
undefined
405
undefined

---

Prefixing these variables with _parent. seems to fix the issue in Ruffle, but Flash Player disagrees:

trace(_parent);
trace(_parent.count);
trace(eval(_parent.tar));
trace(_parent.depth);
trace(_parent.r);

Flash Player traces on the first iteration:

_level0.instance4701.planet
undefined
undefined
undefined
undefined

Ruffle traces on the first iteration:

_level0.instance49.planet
-0.698131700797732
_level0.instance49.planet.sun
undefined
489 (random number)

[Toad06]

Scratch my previous post, in fact the values are not set because the following code in \DefineSprite (19: sun1)\frame 1\DoAction doesn't work as expected:

i = 1;
while(i < numplanets)
{
   attachMovie("ball","ball" + i,i);
   this = eval("ball" + i); // <-- this line
   this.tar = "_parent.sun";
   this.speed = 0.01;
   // (...)
}

• In Ruffle, this is always "_level0.instance49.planet", probably because this is not mutable (as mentioned in [avm1] Better handling of preload/suppress functions flags #7239).

• In Flash Player, the value of this changes every time it is set ("_level0.instance4701.planet.ball1", "_level0.instance4701.planet.ball2", etc.).