使用GDI+生成KnownColor列表

Posted 2021-01-15 lonelyxmas

原文:使用GDI+生成KnownColor列表

在写这篇“GDI+与WPF中的颜色简析”之前，我试着使用GDI+生成KnownColor列表。现将关键代码贴出来吧。

最终效果图：

现将关键代码：
?????????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();
??????? }