使用GDI+生成KnownColor清單

在寫這篇“GDI+與WPF中的顔色簡析”之前，我試着使用GDI+生成KnownColor清單。現将關鍵代碼貼出來吧。

最終效果圖：

現将關鍵代碼：

         Bitmap m_Bitmap = null;

        protected override void OnPaint(PaintEventArgs e)

        {

            base.OnPaint(e);

            if (m_Bitmap != null)

            {

                Graphics g = e.Graphics;

                g.DrawImage(m_Bitmap, new Point(0, 0));

            }

        }

        private void btnTestColor_Click(object sender, EventArgs e)

        {

            int count = 0;

            foreach (string s in Enum.GetNames(typeof(KnownColor)))

            {

                count++;

            }

            int cols = 4;

            int rows = count / cols;

            if (count % rows > 0) rows++;

            int rectWidth = 100;

            int rectHeight = 30;

            int wordSpaceFromRect = 10;

            int rowSpace = 10;

            int marginTop = 20;

            int marginBottom = 20;

            int width = 300 * cols + 50;

            int height = (rectHeight + rowSpace) * rows + marginTop + marginBottom ;

            m_Bitmap = new Bitmap(width, height);

            Graphics g = Graphics.FromImage(m_Bitmap);

            g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;

            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;

            g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;

            g.Clear(Color.White);

            Color someColor = Color.FromArgb(0);

            Color redShade = Color.FromArgb(255, 200, 0, 100);

            SolidBrush myBrush1;

            Font myFont = new Font("Arial", 12);

            int x = 20;

            int y = marginTop;

            for (int i = 0; i < count; i++ )

            {

                someColor = Color.FromKnownColor((KnownColor)i);

                myBrush1.Color = someColor;

                g.FillRectangle(myBrush1, x, y, rectWidth, rectHeight);

                g.DrawRectangle(Pens.Black, x, y, rectWidth, rectHeight);

                g.DrawString(someColor.ToString().Replace("Color [","").Replace("]",""), myFont, Brushes.Black, x + rectWidth + wordSpaceFromRect, y);

                if (i % cols == cols - 1)

                {

                    y += rectHeight + rowSpace;

                    x -= 300 * (cols - 1);

                }

                if (i % cols < cols - 1)

                {

                    x += 300;

                }

            }

            g.Dispose();

            this.Invalidate();

        }