// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Interpolate a three-point calibration
// Not compiled or tested in-world
// Setup: Place in a spare owned prim. Set X0/Y0, X1/Y1, X2/Y2 and INPUT. Touch to run; output is private to the owner.
// Stop / restore: Disable/remove. No scene changes or external calls.
// Notes: Distinct input coordinates are required. Extrapolation outside the calibration range may be unreliable.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT.
float X0=0.0;
float Y0=1.0;
float X1=2.0;
float Y1=4.0;
float X2=5.0;
float Y2=16.0;
float INPUT=3.0;
default
{
    touch_start(integer detectedCount)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        if(llFabs(X0-X1)<0.000001||llFabs(X0-X2)<0.000001||llFabs(X1-X2)<0.000001)
        {
            llOwnerSay("Calibration inputs must differ.");
            return;
        }
        float result=Y0*(INPUT-X1)*(INPUT-X2)/((X0-X1)*(X0-X2))+Y1*(INPUT-X0)*(INPUT-X2)/((X1-X0)*(X1-X2))+Y2*(INPUT-X0)*(INPUT-X1)/((X2-X0)*(X2-X1));
        llOwnerSay("Interpolated output="+(string)result);
    }
}