[SOLVED] Custom Anchor Point for a Rotation?

[Katy133]

How do you change an image's rotation point so that it doesn't rotate from it's centre?

I've used:

Code: Select all

show rocking_horse:
        easeout 0.5 rotate -30
        easein 0.5 rotate -45
        easeout 0.5 rotate 30
        easein 0.5 rotate 45
        easeout 0.5 rotate 15
        easein 0.5 rotate 0

... Which has the image rotate at it's centre. I'm trying to make it rotate from nearer bottom of the image. I've been searching and searching for the right term, but all the experimenting I've done hasn't changed the anchor point.

[xela]

With ATL, you'll have to combine rotation and circle motion for this, it'll require a good grasp on both and a tiny little bit of visualization skills to under what's required to get the desired result.

[Onishion]

There is an easier way to do it, which I stumbled upon. Basically you change where the actual center of the image is. I really wish you could just move the "rotation point" of the image around, but you can't. There is a workaround though. Let's say that you want to make a planet that is in orbit around a sun, right? Let's say that your planet image is a 25x25 pixel image. If you wanted that image to rotate around a fixed point that is 100 pixels away from it, then one easy way to do it is to just edit the image so that instead of just being the planet, it is instead a 25x250 pixel image (25 for the planet, 25 for an imaginary planet on the opposite side, and 100x2 for the distance you want it to rotate), with the planet at the very bottom (or top, whichever), and the rest being transparent space.

This will cause the visible portion of the image to rotate around the invisible center of the image. You can also fake this by making a LiveComposite that just contains the image, and in the image size brackets just give it whatever size you'd need to achieve the desired results. There might be even simpler ways of defining the image to have a "fake" size to it, but I haven't tested them so you can try to figure those out yourself, but that's my basic method, change the size Renpy thinks the image is so that the dead center of that image is where you want the rotational axis to be.

[xela]

There is an easier way to do it

Nice one! It's definitely simpler for anyone who doesn't have a good grasp on atl.