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

        protected override void OnPaint(PaintEventArgs e)
        {
            Graphics g = e.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, System.Math.Min(rc.Right, rc.Bottom) - 8, System.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
                    Accord.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
                        Accord.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 * System.Math.PI / 180;
            double angleCos = System.Math.Cos(angleRad);
            double angleSin = System.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 * System.Math.PI / 180;
                angleCos = System.Math.Cos(angleRad);
                angleSin = System.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(e);
        }