FlxSpine doesn't handle scaling correctly

[bendmorris]

It seems that scaling is distorted when an image is rotated. This works correctly with renderMeshes = true, and incorrectly when renderMeshes = false. For example, here's a slime which does a "squishing" animation (where it gets smaller vertically, then goes back to normal.)

Normal slime:

With renderMeshes (this is also what it looks like in the Spine editor):

Without renderMeshes, he's getting smaller along the horizontal axis instead:

For this specific animation, swapping worldScaleX and worldScaleY:

wrapper.scale.x *= worldScaleY * flipX;
wrapper.scale.y *= worldScaleX * flipY;

...gives the right appearance, but doesn't seem like a general solution.

I'm looking into this, but leaving this here in case anyone else has seen the issue or has an idea.

[bendmorris]

It seems like the problem is that "x" and "y" in scale timelines represent bone-local axes so are being applied incorrectly. In my case the bone is oriented at about 90 degrees, so the scaling at runtime is 90 degrees off.

[bendmorris]

In case anyone else runs into this, I'm using the following workaround:

    _matrix.rotate(wrapper.angle * Math.PI / 180);
    _matrix.scale(wrapper.scale.x, wrapper.scale.y);
    _matrix.translate(wrapper.origin.x, wrapper.origin.y);
    _matrix.scale(bone.worldScaleX * flipX, bone.worldScaleY * flipY);
    _matrix.rotate(flip * -bone.worldRotation * Math.PI / 180);
    _matrix.translate(
        skeleton.x + bone.worldX,
        skeleton.y + bone.worldY
    );

...then using a very hacky method with @:access to render the wrapper image with this transformation matrix instead of calling draw directly. This isn't quite perfect yet - it's off by 180 degrees if you negatively scale an image which was rotated in the atlas - but good enough for me right now.