// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Ellipse position and tangent heading
// Not compiled or tested in-world
// Setup: Place in a spare prim. Set semi-axes and parameter degrees. Owner touch prints results without altering the scene.
// Stop / restore: Disable or remove. No prim properties are changed.
// Notes: Parameter angle is not the same as the point’s polar bearing except on a circle.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Owner-only calculation.
float A=5.0;
float B=2.0;
float ANGLE=40.0;
default
{
    touch_start(integer detectedCount)
    {
        if (llDetectedKey(0)!=llGetOwner()) return;
        if(A<=0.0||B<=0.0)
        {
            llOwnerSay("Positive semi-axes required.");
            return;
        }
        float t=ANGLE*DEG_TO_RAD;
        vector point=<A*llCos(t),B*llSin(t),0.0>;
        vector direction=<-A*llSin(t),B*llCos(t),0.0>;
        llOwnerSay("Point="+(string)point+"; tangent heading="+(string)(llAtan2(direction.y,direction.x)*RAD_TO_DEG));
    }
}