Layered image actual size and anchor?

[xavimat]

Ok. I have a weird question. How are total size and anchor position of a layeredimage calculated?
This code:

Code: Select all

transform spining:
    rotate 0
    linear 2 rotate 360
    repeat
layeredimage things:
    always:
        align (0.5, 0.5)
        rotate 12
        "red"
    always:
        align (0.5, 0.5)
        "green"
    always:
        at spining
        align (0.5, 0.5)
        "blue"
label start:
    show things at truecenter
    pause
    return

Gives me this result (it's clearly not at truecenter):

[Imperf3kt]

I believe truecenter aligns to the center of the window, not the sprite.

[xavimat]

Internally, renpy defines truecenter this way:

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    transform truecenter:
        xpos 0.5 xanchor 0.5 ypos 0.5 yanchor 0.5

So both position and anchor are on the center of the screen.
The image I've attached is actually at truecenter. The problem are the calculations of the size of the layeredimage.
Layeredimage creates a fixed with xfit, and yfit.
It calculates sizes of the layers. If there is a transform it wraps that layer, if the transform is a rotation, it needs to calculate a larger space for the rotation to fit.
Tom on discord said that probably xfit, yfit and rotations didn't work ok together.

[Remix]

You could tell the transform to pre-pad the canvas for rotation (making a square of hypotenuse by hypotenuse)

Code: Select all

transform spining:
    rotate_pad True
    rotate 0
    linear 2 rotate 360
    repeat

Maybe with transform__anchor True as well