AForge.Controls.HuePicker.OnPaint C# (CSharp) Метод

        protected override void OnPaint( PaintEventArgs pe )
        {
            Graphics g = pe.Graphics;
            Rectangle rc = this.ClientRectangle;
            Rectangle rcPie;
            Brush brush;
            RGB rgb = new RGB( );
            HSL hsl = new HSL( );

            // get pie rectangle
            rcPie = new Rectangle( 4, 4, Math.Min( rc.Right, rc.Bottom ) - 8, Math.Min( rc.Right, rc.Bottom ) - 8 );

            // init HSL value
            hsl.Luminance  = 0.5f;
            hsl.Saturation = 1.0f;

            if ( type == HuePickerType.Value )
            {
                // draw HSL pie
                for ( int i = 0; i < 360; i++ )
                {
                    hsl.Hue = i;
                    // convert from HSL to RGB
                    AForge.Imaging.HSL.ToRGB( hsl, rgb );
                    // create brush
                    brush = new SolidBrush( rgb.Color );
                    // draw one hue value
                    g.FillPie( brush, rcPie, -i, -1 );

                    brush.Dispose( );
                }
            }
            else
            {
                // draw HSL pie
                for ( int i = 0; i < 360; i++ )
                {
                    if (
                        ( ( min < max ) && ( i >= min ) && ( i <= max ) ) ||
                        ( ( min > max ) && ( ( i >= min ) || ( i <= max ) ) ) )
                    {
                        hsl.Hue = i;
                        // convert from HSL to RGB
                        AForge.Imaging.HSL.ToRGB( hsl, rgb );
                        // create brush
                        brush = new SolidBrush( rgb.Color );
                    }
                    else
                    {
                        brush = new SolidBrush( Color.FromArgb( 128, 128, 128 ) );
                    }

                    // draw one hue value
                    g.FillPie( brush, rcPie, -i, -1 );

                    brush.Dispose( );
                }
            }

            //
            double halfWidth = (double) rcPie.Width / 2;
            double angleRad = -min * Math.PI / 180;
            double angleCos = Math.Cos( angleRad );
            double angleSin = Math.Sin( angleRad );

            double x = halfWidth * angleCos;
            double y = halfWidth * angleSin;

            ptCenter.X = rcPie.Left + (int) ( halfWidth );
            ptCenter.Y = rcPie.Top  + (int) ( halfWidth );
            ptMin.X   = rcPie.Left  + (int) ( halfWidth + x );
            ptMin.Y   = rcPie.Top   + (int) ( halfWidth + y );

            // draw MIN pointer
            g.FillEllipse( blackBrush,
                rcPie.Left + (int) ( halfWidth + x ) - 4,
                rcPie.Top +  (int) ( halfWidth + y ) - 4,
                8, 8 );
            g.DrawLine( blackPen, ptCenter, ptMin );

            // check picker type
            if ( type == HuePickerType.Range )
            {
                angleRad = -max * Math.PI / 180;
                angleCos = Math.Cos( angleRad );
                angleSin = Math.Sin( angleRad );

                x = halfWidth * angleCos;
                y = halfWidth * angleSin;

                ptMax.X = rcPie.Left + (int) ( halfWidth + x );
                ptMax.Y = rcPie.Top  + (int) ( halfWidth + y );

                // draw MAX pointer
                g.FillEllipse( whiteBrush,
                    rcPie.Left + (int) ( halfWidth + x ) - 4,
                    rcPie.Top +  (int) ( halfWidth + y ) - 4,
                    8, 8 );
                g.DrawLine( whitePen, ptCenter, ptMax );
            }

            base.OnPaint( pe );
        }