AForge.Controls.ManipulatorControl.ManipulatorControl_MouseMove C# (CSharp) Метод

        private void ManipulatorControl_MouseMove( object sender, MouseEventArgs e )
        {
            if ( tracking )
            {
                // get mouse point relatively to manipulation area's center
                int cX = e.X - areaMargin - areaRadius;
                int cY = e.Y - areaMargin - areaRadius;

                if ( isSquareLook )
                {
                    cX = Math.Min( areaRadius, Math.Max( -areaRadius, cX ) );
                    cY = Math.Min( areaRadius, Math.Max( -areaRadius, cY ) );
                }
                else
                {
                    // get distance from center
                    int cR = (int) Math.Sqrt( cX * cX + cY * cY );

                    // correct point if it is too far away
                    if ( cR > areaRadius )
                    {
                        double coef = (double) areaRadius / cR;
                        cX = (int) ( coef * cX );
                        cY = (int) ( coef * cY );
                    }
                }

                manipulatatorX = (float)  cX / areaRadius;
                manipulatatorY = (float) -cY / areaRadius;

                Invalidate( );

                // notify user after 5 timer ticks
                ticksBeforeNotificiation = 5;
            }
        }