Method calcAngleFromXAxis

geometry.js:79–83

( org, pt )

    }

    static calcAngleFromXAxis( org, pt ){
        const x = pt.x - org.x;
        const y = pt.y - org.y;
        return ( x>0 ) ? Math.atan( y/x ) : Math.atan( y/x ) - Math.PI;
    }
}