// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Linked prim distance ruler
// Not compiled or tested in-world
// Setup: Put in the root of a rezzed linked build. Child prims must pass touches to the root, usually by having no touch-handling script. Owner-touch one prim, then another.
// Stop / restore: Remove or disable. No object settings are changed.
// Notes: Measures prim center positions, not touched surface points or mesh bounds. Move or relink only between completed measurement pairs.
// License: see LICENSE in this distribution.
// Original Incoprea example. MIT. Not compiled or tested in-world.
integer pending;
integer firstLink;
vector first;
default
{
    touch_start(integer count)
    {
        if (llDetectedKey(0) != llGetOwner() || llGetLinkNumber() > 1) return;
        integer link = llDetectedLinkNumber(0);
        vector position = llList2Vector(llGetLinkPrimitiveParams(link, [PRIM_POSITION]), 0);
        if (!pending)
        {
            pending = TRUE;
            first = position;
            firstLink = link;
            llOwnerSay("First prim selected. Touch the second prim.");
        }
        else
        {
            pending = FALSE;
            llOwnerSay("Center distance " + (string)firstLink + " to " + (string)link + ": " + (string)llVecDist(first, position) + " meters.");
        }
    }
    changed(integer change)
    {
        if (change & CHANGED_LINK) pending = FALSE;
    }
}