Possible to rotate images without changing anchor values?

[Graph]

Asking this because I've been using custom anchor points for each sprite to figure out where the center of mass is (for example the torso of a body, so not necessarily "0.5, 0.5"). It's used for projectile and weapon targeting. For example:

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image fairy par neutral:
        "fairy_par_neutral.png"
        anchor (239/569.0, 243/424.0)

So, whenever I try to rotate one of these, like with

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rotate -30.0

It jerks a little bit up and left because the anchor resets to (0.5, 0.5). Is there a way to prevent that? (Other than padding all the images with more empty space, because that'll make the load times intolerable in many cases)

[Levrex]

rotate_pad True
(add it before rotating)

[Graph]

Hmm, I don't seem to see much of a difference whether or not I use the rotate_pad. I tried these:

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transform enemy1_fall:
        easeout 3.5 pos (1000, 900) rotate_pad True rotate -30

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transform enemy1_fall:
        easeout 3.5 pos (1000, 900) rotate_pad False rotate -30

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transform enemy1_fall:
        easeout 3.5 pos (1000, 900) rotate -30 rotate_pad True

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transform enemy1_fall:
        easeout 3.5 pos (1000, 900) rotate -30 rotate_pad False

I still see the sprite jump up a little before it starts to rotate. I'd also be fine with being able to rotate around the custom anchor point if that's an option (one that's not (0.5, 0.5)).

[Levrex]

Yeah, i get your point now...
Well, i tried pretty much everything, including RotoZoom and etcetera, but none seems to fix nor the "jerking" neither "anchor" part.
Search shows there were some posts about this problem, which are left unanswered.

But, if you're interested, the test sprite was jumping in one of the many directions with each change - when i'd set "xanchor" together with "rotate" part. Maybe you would figure out how to make the "jump" non-visible by setting instant xpos before rotating the sprite or whatever. I tried that, had no effect whatsoever.

I wonder, when the next chapter of Touhou Mecha is out...

[Graph]

But, if you're interested, the test sprite was jumping in one of the many directions with each change - when i'd set "xanchor" together with "rotate" part. Maybe you would figure out how to make the "jump" non-visible by setting instant xpos before rotating the sprite or whatever.

It should be possible, but it's more trouble than I'd like since the pos adjustment will be different for each sprite. I should be able to get something that looks good without it though, so that's fine.

I'm curious now though. Is there a way to adjust the value of pos relative to the current value? Like say you want to move something horizontally 200 pixels:

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linear (current_xpos + 200)

[Alex]

I'm curious now though. Is there a way to adjust the value of pos relative to the current value? Like say you want to move something horizontally 200 pixels:

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linear (current_xpos + 200)

You need xoffset(http://www.renpy.org/doc/html/style.htm ... properties)

[Graph]

So fast! Thank you both for your replies.

[PyTom]

I'll also note xaround and yaround, which define the point rotation occurs around.

[Levrex]

^ I actually tried setting them, but with no effect...
I.e. it still rotates the sprite around its center, and still changes the position of the sprite.

[Graph]

Also tried xaround and yaround. I didn't notice a change, but interestingly there was no error message when I launched my project either.

I didn't see it in the documentation. Does it go like this?

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show something at somewhere:
        rotate 0
        linear 5 rotate 360 xaround 0.25 yaround 0.25

[Levrex]

Yeah, like so.
It's the same as "around", but divided by axis, so no need for brackets.

[Graph]

So 9 months later, I noticed that Ren'py 6.15 has added something called transform_anchor, which seems to be for the very purpose I've described here. Looks nice, but I'm not sure when and where to set the value? I tried setting it in the image definition, but I get an error when I try to display it:

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image lowerleft anchored line:
        "line.png"
        anchor (0.01, 1.0) transform_anchor 1

[PyTom]

What's the error?

[Graph]

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I'm sorry, but an uncaught exception occurred.

While running game code:
  File "game/story/Chapter-2-6.rpy", line 93, in script
AttributeError: 'ATLTransform' object has no attribute 'child_size'

-- Full Traceback ------------------------------------------------------------

Full traceback:
  File "C:\Users\Danny\Documents\Dan's Art\renpy-6.14.1-sdk\renpy\execution.py", line 288, in run
    node.execute()
  File "C:\Users\Danny\Documents\Dan's Art\renpy-6.14.1-sdk\renpy\ast.py", line 963, in execute
    show_imspec(self.imspec, atl=getattr(self, "atl", None))
  File "C:\Users\Danny\Documents\Dan's Art\renpy-6.14.1-sdk\renpy\ast.py", line 937, in show_imspec
    atl=atl)
  File "C:\Users\Danny\Documents\Dan's Art\renpy-6.14.1-sdk\renpy\exports.py", line 325, in show
    sls.add(layer, img, key, zorder, behind, at_list=at_list, name=name, atl=atl, default_transform=renpy.config.default_transform, transient=transient)
  File "C:\Users\Danny\Documents\Dan's Art\renpy-6.14.1-sdk\renpy\display\core.py", line 725, in add
    thing._show()
  File "C:\Users\Danny\Documents\Dan's Art\renpy-6.14.1-sdk\renpy\display\motion.py", line 846, in _show
    super(ATLTransform, self)._show()
  File "C:\Users\Danny\Documents\Dan's Art\renpy-6.14.1-sdk\renpy\display\motion.py", line 833, in _show
    self.update_state()
  File "C:\Users\Danny\Documents\Dan's Art\renpy-6.14.1-sdk\renpy\display\motion.py", line 710, in update_state
    pos = child.get_placement()
  File "C:\Users\Danny\Documents\Dan's Art\renpy-6.14.1-sdk\renpy\display\image.py", line 171, in get_placement
    return self.target.get_placement()
  File "C:\Users\Danny\Documents\Dan's Art\renpy-6.14.1-sdk\renpy\display\motion.py", line 775, in get_placement
    self.update_state()
  File "C:\Users\Danny\Documents\Dan's Art\renpy-6.14.1-sdk\renpy\display\motion.py", line 710, in update_state
    pos = child.get_placement()
  File "C:\Users\Danny\Documents\Dan's Art\renpy-6.14.1-sdk\renpy\display\image.py", line 171, in get_placement
    return self.target.get_placement()
  File "C:\Users\Danny\Documents\Dan's Art\renpy-6.14.1-sdk\renpy\display\motion.py", line 793, in get_placement
    cw, ch = self.child_size
AttributeError: 'ATLTransform' object has no attribute 'child_size'

Windows-7-6.1.7601-SP1
Ren'Py 6.15.5.354
Touhou Mecha 1.5

(The folder name is 6.14, but you can see at the bottom that the version is up to date.)

I used the image in an animation like this:

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image antiair fire long:
        block:
            "lowerleft anchored line"
            pause 0.1
            "lowerleft anchored line2"
            pause 0.1
            repeat 20

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show antiair fire long as aa1:
        pos(0.0, 1.0)

[Graph]

Most likely, I just have no idea how to properly use the bool value. I've tried putting

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$transform_anchor = True

Both in main.rpy under an init block, and also in the script right before the ATL I posted previously. But in both cases there's no change, and rotation happens around the center of the image as usual. Did I miss something?