【WPF 实例】实现文本描边+外发光效果的示例代码

StupidLittle

于 2024-06-09 23:27:34 发布

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文章标签： wpf hadoop 大数据

原文链接：https://www.jb51.net/article/241531.htm

版权

这篇文章主要介绍了如何利用WPF实现文本描边以及外发光的效果，文中的示例代码讲解详细，对我们学习有一定帮助，需要的可以参考一下。

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：