解决思路：
（1）描边效果可以将文本字符串用GDI+生成Bitmap，然后转成BitmapImage，再用WPF的Image控件显示。
（2）外发光效果用WPF自带的Effect实现
代码：
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.IO;
namespace TextHighLighthDemo
{
public class FancyText
{
private static System.Windows.Media.Imaging.BitmapImage BitmapToBitmapImage(System.Drawing.Bitmap bitmap)
{
using (MemoryStream stream = new MemoryStream())
{
bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Png); // 坑点：格式选Bmp时，不带透明度
stream.Position = 0;
System.Windows.Media.Imaging.BitmapImage result = new System.Windows.Media.Imaging.BitmapImage();
result.BeginInit();
result.CacheOption = System.Windows.Media.Imaging.BitmapCacheOption.OnLoad;
result.StreamSource = stream;
result.EndInit();
result.Freeze();
return result;
}
}
private static Bitmap ImageFromText(string strText, Font fnt, Color clrFore, Color clrBack, int blurAmount = 5)
{
Bitmap bmpOut = null;
int sunNum = 255; //光晕的值
using (Graphics g = Graphics.FromHwnd(IntPtr.Zero))
{
SizeF sz = g.MeasureString(strText, fnt);
using (Bitmap bmp = new Bitmap((int)sz.Width, (int)sz.Height))
using (Graphics gBmp = Graphics.FromImage(bmp))
using (SolidBrush brBack = new SolidBrush(Color.FromArgb(sunNum, clrBack.R, clrBack.G, clrBack.B)))
using (SolidBrush brFore = new SolidBrush(clrFore))
{
gBmp.SmoothingMode = SmoothingMode.HighQuality;
gBmp.InterpolationMode = InterpolationMode.HighQualityBilinear;
gBmp.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
gBmp.DrawString(strText, fnt, brBack, 0, 0);
bmpOut = new Bitmap(bmp.Width + blurAmount, bmp.Height + blurAmount);
using (Graphics gBmpOut = Graphics.FromImage(bmpOut))
{
gBmpOut.SmoothingMode = SmoothingMode.HighQuality;
gBmpOut.InterpolationMode = InterpolationMode.HighQualityBilinear;
gBmpOut.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
//阴影光晕
for (int x = 0; x <= blurAmount; x++)
{
for (int y = 0; y <= blurAmount; y++)
{
gBmpOut.DrawImageUnscaled(bmp, x, y);
}
}
gBmpOut.DrawString(strText, fnt, brFore, blurAmount / 2, blurAmount / 2);
}
}
}
return bmpOut;
}
/// <summary>
/// 文本转图片
/// </summary>
/// <param name="strText"></param>
/// <param name="fnt"></param>
/// <param name="clrFore"></param>
/// <param name="clrBack"></param>
/// <param name="blurAmount"></param>
/// <returns></returns>
public static System.Windows.Media.Imaging.BitmapImage BitmapImageFromText(string strText, Font fnt, Color clrFore, Color clrBack, int blurAmount = 5)
{
return BitmapToBitmapImage(ImageFromText(strText, fnt, clrFore, clrBack, blurAmount));
}
}
}应用：
（1）XMAL代码
<Grid Background="Gray">
<StackPanel Height="300">
<Image x:Name="img" Height="70" VerticalAlignment="Top" >
<Image.Effect>
<DropShadowEffect Color="#00ffff" ShadowDepth="0" BlurRadius="15"/>
</Image.Effect>
</Image>
<Image x:Name="img1" Height="35" VerticalAlignment="Top" Margin="0 10 0 0">
<Image.Effect>
<DropShadowEffect Color="#00ffff" ShadowDepth="0" BlurRadius="5"/>
</Image.Effect>
</Image>
</StackPanel>
</Grid>（2）code behind
var backColor = System.Drawing.ColorTranslator.FromHtml("#037be2");
var forColor= System.Drawing.ColorTranslator.FromHtml("#ffffff");
img.Source = FancyText.BitmapImageFromText("测试字体，微软雅黑", new System.Drawing.Font("Microsoft YaHei", 60, System.Drawing.FontStyle.Bold), forColor, backColor, 6);
img1.Source = FancyText.BitmapImageFromText("外发光+描边", new System.Drawing.Font("Microsoft YaHei", 30, System.Drawing.FontStyle.Bold), forColor, backColor, 3);效果：
优化点：可以将FancyText封装成自定义控件，定义描边大小，颜色值等依赖属性，直接为WPF使用。
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