获得发光效果的最佳方式 Windows Phone 7

我正在摆弄 Windows Phone 7 sdk，并试图让屏幕看起来像老式数字显示屏。现在我正在尝试弄清楚如何使文本像那些很酷的数字时钟之一一样“发光”。我假设您会考虑使用着色器来实现这种目的，但似乎在 Windows Phone 7 操作系统上禁用了着色器。有任何想法吗？更具体地说，我希望文本看起来就像是一个光源，并且颜色从实际字体中稍微“渗出”。

我想说它是使用图像作为字体还是使用 WriteableBitmap 进行模糊的选择。

使用预制字体图像可以使字母变得复杂，并且应该表现良好。雪碧字体2很方便，因为它可以生成具有发光、描边、阴影等效果的 SpriteSheet，并导出包含字母位置的 xml 文件。 将生成的 png 和 xml 文件添加到您的解决方案中，并将“生成操作”更改为内容，同时检查您是否引用了 System.Xml.Linq。

然后就可以使用下面的类了。

public static class BitmapFont
{
    private class FontInfo
    {
        public FontInfo(WriteableBitmap image, Dictionary<char, Rect> metrics)
        {
            this.Image = image;
            this.Metrics = metrics;
        }
        public WriteableBitmap Image { get; private set; }
        public Dictionary<char, Rect> Metrics { get; private set; }
    }

    private static Dictionary<string, FontInfo> fonts = new Dictionary<string, FontInfo>();
    public static void RegisterFont(string fontFile, string fontMetricsFile)
    {
        string name = System.IO.Path.GetFileNameWithoutExtension(fontFile);
        BitmapImage image = new BitmapImage();

        image.SetSource(App.GetResourceStream(new Uri(fontFile,UriKind.Relative)).Stream);
        var metrics = XDocument.Load(fontMetricsFile);
        var dict = (from c in metrics.Root.Elements()
                    let key = (char)((int)c.Attribute("key"))
                    let rect = new Rect((int)c.Element("x"), (int)c.Element("y"), (int)c.Element("width"), (int)c.Element("height"))
                    select new { Char = key, Metrics = rect }).ToDictionary(x => x.Char, x => x.Metrics);

        fonts.Add(name,new FontInfo(new WriteableBitmap(image),dict));
    }

    public static WriteableBitmap DrawFont(string text, string fontName)
    {
        var font = fonts[fontName];

        var letters = text.Select(x => font.Metrics[x]).ToArray();
        var height = (int)letters.Max(x => x.Height);
        var width = (int)letters.Sum(x => x.Width);

        WriteableBitmap bmp = new WriteableBitmap(width, height);

        int[] source = font.Image.Pixels, dest = bmp.Pixels;
        int sourceWidth = font.Image.PixelWidth;
        int destX = 0;
        foreach (var letter in letters)
        {
            for (int sourceY = (int)letter.Y, destY = 0; destY < letter.Height; sourceY++, destY++)
            {
                Array.Copy(source, (sourceY * sourceWidth) + (int)letter.X, dest, (destY * width) + destX, (int)letter.Width);
            }
            destX += (int)letter.Width;
        }

        return bmp;
    }

    public static Rectangle[] GetElements(string text, string fontName)
    {
        var font = fonts[fontName];

        return (from c in text
                let r = font.Metrics[c]
                select new Rectangle
                {
                    Width = r.Width,
                    Height = r.Height,

                    Fill = new ImageBrush { 
                        ImageSource = font.Image, 
                        AlignmentX=AlignmentX.Left,
                        AlignmentY=AlignmentY.Top,
                        Transform = new TranslateTransform { X = -r.X, Y = -r.Y },
                        Stretch=Stretch.None                        
                    },
                }).ToArray();
    }
}

Usage

//Register the font once.
BitmapFont.RegisterFont("Font.png", "Metrics.xml");

//Draws the text to a new bitmap, font name is image name without extension.
image.Source = BitmapFont.DrawFont(DateTime.Now.ToLongTimeString(), "Font");

//Alternatively put these elements in a horizontal StackPanel, or ItemsControl
//This doesn't create any new bitmaps and should be more efficient.
//You could alter the method to transform each letter too.
BitmapFont.GetElements(DateTime.Now.ToLongTimeString(), "Font");

如果你想模糊，请参阅 BoxBlur 实现here or use WriteableBitmapEx.Convolute.