// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Touch-sampled alternating arc tiles
// Not compiled or tested in-world
// Setup: Put in a spare ordinary cube you own. Touch different places on one face to sample the procedural pattern at live surface coordinates. Edit the constants to design a pattern.
// Stop / restore: Disable/remove. Only private owner messages are produced; no texture or tint is applied.
// Notes: The tile orientation alternates by parity. It demonstrates linked arc motifs, not random tile placement. Surface coordinates depend on the viewer and mesh; ordinary prim faces are the clearest test surface.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Live surface-coordinate sampler.
float REPEATS=4.0;
float LINE_WIDTH=0.06;
default
{
    touch_start(integer detectedCount)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        vector uv=llDetectedTouchST(0);
        if(llDetectedTouchFace(0)<0||uv==TOUCH_INVALID_TEXCOORD)
        {
            llOwnerSay("Surface coordinates unavailable.");
            return;
        }
        vector p=2.0*uv-<1.0,1.0,0.0>;
        if(REPEATS<=0.0||LINE_WIDTH<=0.0)
        {
            llOwnerSay("Invalid tile settings.");
            return;
        }
        float x=uv.x*REPEATS;
        float y=uv.y*REPEATS;
        integer parity=(llFloor(x)+llFloor(y))&1;
        x-=llFloor(x);
        y-=llFloor(y);
        if(parity)x=1.0-x;
        float a=llFabs(llSqrt(x*x+y*y)-0.5);
        float b=llFabs(llSqrt((1.0-x)*(1.0-x)+(1.0-y)*(1.0-y))-0.5);
        float distance=a;
        if(b<distance)distance=b;
        llOwnerSay("Tile orientation="+(string)parity+" on arc="+(string)(distance<LINE_WIDTH));
    }
}