Accord.Controls.HuePicker.HSLPicker_MouseDown C# (CSharp) Method

        private void HSLPicker_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            // check coordinates of MIN pointer
            if ((e.X >= ptMin.X - 4) && (e.Y >= ptMin.Y - 4) &&
                 (e.X < ptMin.X + 4) && (e.Y < ptMin.Y + 4))
            {
                trackMode = 1;
            }
            if (type == HuePickerType.Range)
            {
                // check coordinates of MAX pointer
                if ((e.X >= ptMax.X - 4) && (e.Y >= ptMax.Y - 4) &&
                     (e.X < ptMax.X + 4) && (e.Y < ptMax.Y + 4))
                {
                    trackMode = 2;
                }
            }

            if (trackMode != 0)
                this.Capture = true;
        }