WTS/game/scripts/interface/wheelmenu.rpy

init python in wheelmenu:
    import math

    def pos(num_buttons):
        reference_num_buttons = 32
        reference_radius = 0.5
        radius = reference_radius * (num_buttons / reference_num_buttons) ** 0.5
        angle_step = 2 * math.pi / num_buttons
        start_angle = angle_step / 2 if num_buttons % 2 else 0
        positions = [(min(max(0.5 + math.cos(start_angle + i * angle_step) * radius, 0.0), 1.0),
                    min(max(0.5 + math.sin(start_angle + i * angle_step) * radius, 0.0), 1.0))
                    for i in range(num_buttons)]
        return positions

    def button(displayable, action, condition, state=None, **kwargs):
        """
            displayable - Ren'Py displayable
            action - Ren'Py screen action
            condition - Boolean
            state -
                None - No change
                "hidden" - Hidden if condition==False
                "disabled" - Disabled if condition==False
        """

        if state == "hidden":
            return None
        elif state == "disabled":
            return renpy.store.Button(displayable, action=action, style="wheelmenu_disabled_button", **kwargs)

        if condition:
            return renpy.store.Button(displayable, action=action, style="wheelmenu_button", **kwargs)
        else:
            return None

init python:
    def create_wheelmenu(elements):
        # Proxy function; We cannot evaluate in a named store without side effects.

        buttons = []
        for name, (displayable, action, condition) in elements.items():
            condition = eval(condition)

            buttons.append(wheelmenu.button(displayable, action, condition, tooltip=name))

        positions = wheelmenu.pos(len(buttons))

        return tuple(zip(buttons, positions)) # Nonhashable types cannot be used in a screen, so we use a tuple instead.

    config.per_frame_screens.append("wheelmenu")

label wheelmenu(btns, ret, pos=None):
    call screen wheelmenu(btns, pos)

    jump expression ret

screen wheelmenu(btns, pos):
    layer "interface"
    tag wheelmenu
    zorder 4
    style_prefix "wheelmenu"

    $ mpos = renpy.get_mouse_pos()
    default start_pos = pos or mpos

    use close_button_background(keysym="game_menu")

    window at wheelmenu_anim:
        id "wheelmenu"
        pos start_pos

        for btn, pos in btns:
            add btn pos pos

        add "wheelmenu_genie" align (0.5, 0.5) at transform:
            subpixel True
            xysize (48, 48)
            yzoom (-1 if mpos[0] > start_pos[0] else 1)
            rotate (math.degrees(math.atan2(mpos[1] - start_pos[1], mpos[0] - start_pos[0])) + 360) % 360 - 180

style wheelmenu_window is empty:
    background Transform("wheelmenu_gradient", align=(0.5, 0.5), xysize=(200, 200))
    maximum (400, 400)
    anchor (0.5, 0.5)

style wheelmenu_button is empty:
    background Transform("wheelmenu_button", xysize=(48,48))
    hover_background At(Transform("wheelmenu_button_opaque", xysize=(48,48)), wheelmenu_hover_anim)
    xysize (48, 48)
    anchor (0.5, 0.5)

style wheelmenu_disabled_button is wheelmenu_button:
    background "#ffffff80"
    xysize (48, 48)
    anchor (0.5, 0.5)

style wheelmenu_window_text is default:
    anchor (0.5, 0.5)
    color "#fff"
    size 10
    outlines [(1, "#00000080", 1, 0)]

style wheelmenu_button_text is wheelmenu_text

transform wheelmenu_anim:
    on show:
        zoom 0.0
        easein 0.15 zoom 1.0
    on hide:
        easeout 0.15 zoom 0.0

transform wheelmenu_hover_anim(t=2.0, strength=0.2, pause=0.0):
    matrixcolor BrightnessMatrix(value=0.0)
    linear t/2 matrixcolor BrightnessMatrix(value=strength)
    linear t/2 matrixcolor BrightnessMatrix(value=0.0)
    pause pause
    repeat

# transform tooltip_follow:
#     events False
#     function tooltip_func

# init python:

    # def tooltip_func(trans, st, at):
    #     x, y = renpy.get_mouse_pos()

    #     if trans.pos is not (x, y):
    #         cw, ch = trans.child.window_size

    #         xanchor = 1.0 if (x + int(cw)) > (config.screen_width) else 0.0
    #         yanchor = 1.0 if (y + int(ch)) > (config.screen_height) else 0.0

    #         xoffset = 18 if xanchor else 0
    #         yoffset = 24 if yanchor else 0
    #         trans.pos = (x, y)
    #         trans.anchor = (xanchor, yanchor)
    #         trans.offset = (xoffset, yoffset)

    #         return 0

    # if not renpy.android:

    #     config.always_shown_screens.append("tooltip")
    #     config.per_frame_screens.append("tooltip")