Question

我正在尝试编写一个简单的属性网格，以允许用户修改图表的颜色。默认情况下，Chart具有“Palette”属性，该属性的枚举类型为“ChartColorPalette”。如果作为我的属性网格的对象也具有相同类型的“Palette”属性，我会得到可能值的下拉列表。然而，我没有得到的是值名称左侧的小条纹图像。

现在，我可以编写一个UITypeEditor派生类，并让“PaintValue”绘制一些资源位图，我已经使用“Paint”或某些东西从屏幕中剔除了这些位图，但这看起来相当繁琐。

有没有人知道是否已有“ChartColorPalette”枚举的类型编辑器，我可以使用它来获取小位图？

Answer 1

碰巧，编写UITypeEditor并不是那么棘手，也没有那么多代码。首先，我创建了一个类似于以下内容的类型编辑器：

private class ChartColorPaletteEditor : UITypeEditor
{
    public override bool GetPaintValueSupported(ITypeDescriptorContext context)
    {
        return true;
    }

    public override void PaintValue(PaintValueEventArgs e)
    {
        String paletteName = e.Value.ToString();
        String baseName = this.GetType().Namespace + ".MyChart";
        ResourceManager mgr = new ResourceManager(baseName, this.GetType().Assembly);
        Bitmap bmp = mgr.GetObject(paletteName) as Bitmap;
        if (bmp != null)
        {
            e.Graphics.DrawImage(bmp, e.Bounds);
            bmp.Dispose();
        }
    }
}

我以通常的方式将它附加到我的控制属性：

[DefaultValue(typeof(ChartColorPalette), "BrightPastel")]
[Editor(typeof(ChartColorPaletteEditor), typeof(System.Drawing.Design.UITypeEditor))]
[Category("Appearance")]
[Description("The named palette to use when choosing the colour scheme for the chart series lines.")]
public ChartColorPalette Palette { get; set; }

然后我为每个小调色板图像添加了一个小的PNG资源。我有一个从“图表”继承的派生控件“MyChart”，我将图像添加到资源中（确保将“Persistance”属性设置为“Embedded in .resx”以保存必须保留PNG文件）。 PNG文件的名称与ChartColorPalette枚举中的名称匹配。

唯一的问题是从哪里获取20 x 14小图像。我最初只是使用Paint.exe来剔除它们但不喜欢它，所以我写了一些代码来为我生成它们。一旦我找到了Charting控件使用的颜色值，这就相当简单了。一个微妙之处在于，调色板中有超过12种颜色，小位图使用其他所有颜色。该代码看起来像这样：

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Reflection;
using System.Windows.Forms.DataVisualization.Charting;

namespace ConsoleApplication10
{
class Program
{
  static void Main(string[] args)
  {
     Enum.GetValues(typeof(ChartColorPalette)).OfType<ChartColorPalette>().ToList().ForEach(GeneratePNG);
  }

  static void GeneratePNG(ChartColorPalette palette)
  {
     if (palette == ChartColorPalette.None) return;

     Color[] colours = palette.GetColors();

     if (colours.Length >= 12)
     {
        colours = new Color[] { colours[0], colours[2], colours[4], colours[6], colours[8], colours[10] };
     }
     else
     {
        colours = new Color[] { colours[0], colours[1], colours[2], colours[3], colours[4], colours[5] };
     }

     using (Bitmap bmp = new Bitmap(20, 14))
     {
        using (Graphics gr = Graphics.FromImage(bmp))
        {
           using (SolidBrush b1 = new SolidBrush(colours[0]),
                             b2 = new SolidBrush(colours[1]),
                             b3 = new SolidBrush(colours[2]),
                             b4 = new SolidBrush(colours[3]),
                             b5 = new SolidBrush(colours[4]),
                             b6 = new SolidBrush(colours[5]))
           {
              int height = bmp.Height - 2;
              gr.DrawRectangle(Pens.Black, 0, 0, bmp.Width - 1, bmp.Height - 1);
              gr.FillRectangle(b1, new Rectangle(1, 1, 3, height));
              gr.FillRectangle(b2, new Rectangle(4, 1, 3, height));
              gr.FillRectangle(b3, new Rectangle(7, 1, 3, height));
              gr.FillRectangle(b4, new Rectangle(10, 1, 3, height));
              gr.FillRectangle(b5, new Rectangle(13, 1, 3, height));
              gr.FillRectangle(b6, new Rectangle(16, 1, 3, height));
           }
        }

        String path = System.Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
        path = Path.Combine(path, @"Visual Studio 2010\Projects\DataVisualization.Charting\Palette Bitmaps");

        String filename = palette.ToString() + ".png";
        bmp.Save(Path.Combine(path, filename), ImageFormat.Png);
     }
  }
}

public static class Extensions
{
  public static Color[] GetColors(this ChartColorPalette value)
  {
     switch (value)
     {
        case ChartColorPalette.Berry:
           return GetColors(0x8a2be2, 0xba55d3, 0x4169e1, 0xc71585, 0x0000ff, 0x8a2be2, 0xda70d6, 0x7b68ee, 0xc000c0, 0x0000cd, 0x800080);
        case ChartColorPalette.Bright:
           return GetColors(0x008000, 0x0000ff, 0x800080, 0x00ff00, 0xff00ff, 0x008080, 0xffff00, 0x808080, 0x00ffff, 0x000080, 0x800000, 0xff0000, 0x808000, 0xc0c0c0, 0xff6347, 0xffe4b5);
        case ChartColorPalette.BrightPastel:
           return GetColors(0x418cf0, 0xfcb441, 0xe0400a, 0x056492, 0xbfbfbf, 0x1a3b69, 0xffe382, 0x129cdd, 0xca6b4b, 0x005cdb, 0xf3d288, 0x506381, 0xf1b9a8, 0xe0830a, 0x7893be);
        case ChartColorPalette.Chocolate:
           return GetColors(0xa0522d, 0xd2691e, 0x8b0000, 0xcd853f, 0xa52a2a, 0xf4a460, 0x8b4513, 0xc04000, 0xb22222, 0xb65c3a);
        case ChartColorPalette.EarthTones:
           return GetColors(0xff8000, 0xb8860b, 0xc04000, 0x6b8e23, 0xcd853f, 0xc0c000, 0x228b22, 0xd2691e, 0x808000, 0x20b2aa, 0xf4a460, 0x00c000, 0x8fbc8b, 0xb22222, 0x8b4513, 0xc00000);
        case ChartColorPalette.Excel:
           return GetColors(0x9999ff, 0x993366, 0xffffcc, 0xccffff, 0x660066, 0xff8080, 0x0066cc, 0xccccff, 0x000080, 0xff00ff, 0xffff00, 0x00ffff, 0x800080, 0x800000, 0x008080, 0x0000ff);
        case ChartColorPalette.Fire:
           return GetColors(0xffd700, 0xff0000, 0xff1493, 0xdc143c, 0xff8c00, 0xff00ff, 0xffff00, 0xff4500, 0xc71585, 0xdde221);
        case ChartColorPalette.Grayscale:
           return GetColors(0xc8c8c8, 0xbdbdbd, 0xb2b2b2, 0xa7a7a7, 0x9c9c9c, 0x919191, 0x868686, 0x7b7b7b, 0x707070, 0x656565, 0x5a5a5a, 0x4f4f4f, 0x444444, 0x393939, 0x2e2e2e, 0x232323);
        case ChartColorPalette.Light:
           return GetColors(0xe6e6fa, 0xfff0f5, 0xffdab9, 0xfffacd, 0xffe4e1, 0xf0fff0, 0xf0f8ff, 0xf5f5f5, 0xfaebd7, 0xe0ffff);
        case ChartColorPalette.Pastel:
           return GetColors(0x87ceeb, 0x32cd32, 0xba55d3, 0xf08080, 0x4682b4, 0x9acd32, 0x40e0d0, 0xff69b4, 0xf0e68c, 0xd2b48c, 0x8fbc8b, 0x6495ed, 0xdda0dd, 0x5f9ea0, 0xffdab9, 0xffa07a);
        case ChartColorPalette.SeaGreen:
           return GetColors(0x2e8b57, 0x66cdaa, 0x4682b4, 0x008b8b, 0x5f9ea0, 0x3cb371, 0x48d1cc, 0xb0c4de, 0xffffff, 0x87ceeb);
        case ChartColorPalette.SemiTransparent:
           return GetColors(0xff6969, 0x69ff69, 0x6969ff, 0xffff69, 0x69ffff, 0xff69ff, 0xcdb075, 0xffafaf, 0xafffaf, 0xafafff, 0xffffaf, 0xafffff, 0xffafff, 0xe4d5b5, 0xa4b086, 0x819ec1);
        case ChartColorPalette.None:
        default:
           return GetColors(0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000);
     }
  }

  private static Color[] GetColors(params Int32[] values)
  {
     return values.Select(value => Color.FromArgb(255, Color.FromArgb(value))).ToArray(); // alpha channel of 255 for fully opaque
  }
 }
}

希望这对那里的人有用......

是否存在类型为“ChartColorPalette”的PropertyGrid UITypeEditor？

1 个答案: