// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Test overlap of two rotated floor rectangles
// Not compiled or tested in-world
// Setup: Use a spare owned prim. Set centers, positive half-extents and yaw degrees. Touch for owner-only calculation output.
// Stop / restore: Remove/disable. Does not sense, collide with, or modify actual objects.
// Notes: Tangency counts as overlap. This is a static test and does not calculate a collision response.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Ideal geometry only.
vector A=ZERO_VECTOR;
vector B=<3.0,1.0,0.0>;
vector HA=<2.0,1.0,0.0>;
vector HB=<1.5,1.0,0.0>;
float ANGLE_A=20.0;
float ANGLE_B=-15.0;
default
{
    touch_start(integer detectedCount)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        if(HA.x<=0.0||HA.y<=0.0||HB.x<=0.0||HB.y<=0.0)
        {
            llOwnerSay("Positive extents required.");
            return;
        }
        float a=ANGLE_A*DEG_TO_RAD;
        float b=ANGLE_B*DEG_TO_RAD;
        vector ax=<llCos(a),llSin(a),0.0>;
        vector ay=<-ax.y,ax.x,0.0>;
        vector bx=<llCos(b),llSin(b),0.0>;
        vector by=<-bx.y,bx.x,0.0>;
        list axes=[ax,ay,bx,by];
        vector delta=B-A;
        integer i;
        for(i=0;i<4;++i)
        {
            vector axis=llList2Vector(axes,i);
            float ra=HA.x*llFabs(ax*axis)+HA.y*llFabs(ay*axis);
            float rb=HB.x*llFabs(bx*axis)+HB.y*llFabs(by*axis);
            if(llFabs(delta*axis)>ra+rb)
            {
                llOwnerSay("Separated on axis "+(string)i);
                return;
            }
        }
        llOwnerSay("Rectangles touch or overlap.");
    }
}