void panel1_Paint(object sender, PaintEventArgs e)
        {
            // Doc PCT Data
            PCTFeature_RGB data = PCTReadingFeature.ReadingFeatureFromFile_RGB(currentPctFilePath);

            _bitmap = ImageHelper.GetBitmapFromFile(currentImgFilePath);


            // Load data
            panel1.Width    = data.Width * 2 + 30;
            panel1.Height   = data.Height * 2 + 15;
            panel2.Location = new Point(5, panel1.Location.Y + panel1.Height + 25);
            Graphics g = e.Graphics;

            g.DrawImage(_bitmap, new Point(0, 0));
            g.DrawImage(_bitmap, new Point(15 + data.Width, 15 + data.Height));
            g.DrawImage(_bitmap, new Point(0, 15 + data.Height));


            foreach (Dot_RGB dot in data.ListColorPoint)
            {
                // draw pct dots
                DrawDotWithBorder(g, new Dot_RGB(new Point(dot.location.X, dot.location.Y + data.Height + 15), dot.radius, dot.color));

                // draw visual dots
                Color c = listVisualWords[DistanceHelper.ColorKNN(dot.color, listVisualWords, currentColorSpaceForFormula, currentDistanceFormulaRGB, currentDistanceFormulaLab)];
                if (dot.radius >= 10)
                {
                    DrawDotWithBorder(g, new Dot_RGB(new Point(dot.location.X + data.Width + 15, dot.location.Y + data.Height + 15), dot.radius, c));
                }
            }
        }