Real coordinates of rotated image? images in chain?

How-to
1

Hi everyone. i have problem with object rotation coordinates
as i see object coords x1-x2-y1-y2 are not changing during rotation process.
how can i get real coordinates of image edges that i am rotating?

my goal is to connect several images one by one and keep connection when i am rotating them (up to 80 degree)

so it might look like a snake or whip or train where wagons are images with connections.

now i am trying to use cos and sin to get new coordinates of edge if each image after rotation.

is there any way to make it easyer?

2

still trying to find solution.

ive found method in docs that has description that i think do the trick.
void _lv_img_buf_get_transformed_area(lv_area_t *res, lv_coord_t w, lv_coord_t h, int16_t angle, uint16_t zoom, const lv_point_t *pivot)
Get the area of a rectangle if its rotated and scaled

but there is no object input… any help?

so i need real coordinates of rotated object