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图片：如何使用 ASP.NET 和 C# 在图像上写入文本

更新时间: 2023-04-04 13:54:53  作者: 佚名

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介绍

本文介绍了如何使用 Asp.Net 和 C# 在图像上编写文本。在这篇文章中，我使用了一些常见的库函数和方法。

图像类和位图类

  • 图像类是抽象类的示例之一
  • Bitmap 类是 Image 类的实现，它继承自 Abstract Image 类
  • 实现后我们可以在Bitmap Class中得到Image Class的功能。

C#代码

以下代码用于在图像上写文字。我们可以根据我们的要求更改以下功能。 


 //creating a image object
System.Drawing.Image bitmap = (System.Drawing.Image)Bitmap.FromFile(Server.MapPath("onam.jpg")); // set image 
//draw the image object using a Graphics object
Graphics graphicsImage = Graphics.FromImage(bitmap);

//Set the alignment based on the coordinates

StringFormat stringformat = new StringFormat();
stringformat.Alignment = StringAlignment.Far;
stringformat.LineAlignment = StringAlignment.Far;


StringFormat stringformat2 = new StringFormat();
stringformat2.Alignment = StringAlignment.Center;
stringformat2.LineAlignment = StringAlignment.Center;


//Set the font color/format/size etc..

Color StringColor = System.Drawing.ColorTranslator.FromHtml("#933eea");//direct color adding
Color StringColor2 = System.Drawing.ColorTranslator.FromHtml("#e80c88");//customise color adding
string Str_TextOnImage = "Happy";//Your Text On Image
string Str_TextOnImage2 = "Onam";//Your Text On Image


graphicsImage.DrawString(Str_TextOnImage, new Font("arial", 40,
FontStyle.Regular), new SolidBrush(StringColor), new Point(268, 245),
stringformat); Response.ContentType = "image/jpeg";


graphicsImage.DrawString(Str_TextOnImage2, new Font("Edwardian Script ITC", 111,
FontStyle.Bold), new SolidBrush(StringColor2), new Point(145, 255),
stringformat2); Response.ContentType = "image/jpeg";


bitmap.Save(Response.OutputStream, ImageFormat.Jpeg);

图形和位图

Bitmap 是用于处理由像素数据定义的图像的对象，您可以使用 Graphics 对象绘制图像对象。检查下面的代码。 


 //creating a image object
System.Drawing.Image bitmap = (System.Drawing.Image)Bitmap.FromFile(Server.MapPath("onam.jpg")); // set image 
//draw the image object using a Graphics object
Graphics graphicsImage = Graphics.FromImage(bitmap);

//Set the alignment based on the coordinates

StringFormat stringformat = new StringFormat();
stringformat.Alignment = StringAlignment.Far;
stringformat.LineAlignment = StringAlignment.Far;


StringFormat stringformat2 = new StringFormat();
stringformat2.Alignment = StringAlignment.Center;
stringformat2.LineAlignment = StringAlignment.Center;


//Set the font color/format/size etc..

Color StringColor = System.Drawing.ColorTranslator.FromHtml("#933eea");//direct color adding
Color StringColor2 = System.Drawing.ColorTranslator.FromHtml("#e80c88");//customise color adding
string Str_TextOnImage = "Happy";//Your Text On Image
string Str_TextOnImage2 = "Onam";//Your Text On Image


graphicsImage.DrawString(Str_TextOnImage, new Font("arial", 40,
FontStyle.Regular), new SolidBrush(StringColor), new Point(268, 245),
stringformat); Response.ContentType = "image/jpeg";


graphicsImage.DrawString(Str_TextOnImage2, new Font("Edwardian Script ITC", 111,
FontStyle.Bold), new SolidBrush(StringColor2), new Point(145, 255),
stringformat2); Response.ContentType = "image/jpeg";


bitmap.Save(Response.OutputStream, ImageFormat.Jpeg);

格式化字符串

根据坐标更改文本对齐方式。 


 //creating a image object
System.Drawing.Image bitmap = (System.Drawing.Image)Bitmap.FromFile(Server.MapPath("onam.jpg")); // set image 
//draw the image object using a Graphics object
Graphics graphicsImage = Graphics.FromImage(bitmap);

//Set the alignment based on the coordinates

StringFormat stringformat = new StringFormat();
stringformat.Alignment = StringAlignment.Far;
stringformat.LineAlignment = StringAlignment.Far;


StringFormat stringformat2 = new StringFormat();
stringformat2.Alignment = StringAlignment.Center;
stringformat2.LineAlignment = StringAlignment.Center;


//Set the font color/format/size etc..

Color StringColor = System.Drawing.ColorTranslator.FromHtml("#933eea");//direct color adding
Color StringColor2 = System.Drawing.ColorTranslator.FromHtml("#e80c88");//customise color adding
string Str_TextOnImage = "Happy";//Your Text On Image
string Str_TextOnImage2 = "Onam";//Your Text On Image


graphicsImage.DrawString(Str_TextOnImage, new Font("arial", 40,
FontStyle.Regular), new SolidBrush(StringColor), new Point(268, 245),
stringformat); Response.ContentType = "image/jpeg";


graphicsImage.DrawString(Str_TextOnImage2, new Font("Edwardian Script ITC", 111,
FontStyle.Bold), new SolidBrush(StringColor2), new Point(145, 255),
stringformat2); Response.ContentType = "image/jpeg";


bitmap.Save(Response.OutputStream, ImageFormat.Jpeg);

图片上的文字

设置字体颜色、大小、格式。 


 //creating a image object
System.Drawing.Image bitmap = (System.Drawing.Image)Bitmap.FromFile(Server.MapPath("onam.jpg")); // set image 
//draw the image object using a Graphics object
Graphics graphicsImage = Graphics.FromImage(bitmap);

//Set the alignment based on the coordinates

StringFormat stringformat = new StringFormat();
stringformat.Alignment = StringAlignment.Far;
stringformat.LineAlignment = StringAlignment.Far;


StringFormat stringformat2 = new StringFormat();
stringformat2.Alignment = StringAlignment.Center;
stringformat2.LineAlignment = StringAlignment.Center;


//Set the font color/format/size etc..

Color StringColor = System.Drawing.ColorTranslator.FromHtml("#933eea");//direct color adding
Color StringColor2 = System.Drawing.ColorTranslator.FromHtml("#e80c88");//customise color adding
string Str_TextOnImage = "Happy";//Your Text On Image
string Str_TextOnImage2 = "Onam";//Your Text On Image


graphicsImage.DrawString(Str_TextOnImage, new Font("arial", 40,
FontStyle.Regular), new SolidBrush(StringColor), new Point(268, 245),
stringformat); Response.ContentType = "image/jpeg";


graphicsImage.DrawString(Str_TextOnImage2, new Font("Edwardian Script ITC", 111,
FontStyle.Bold), new SolidBrush(StringColor2), new Point(145, 255),
stringformat2); Response.ContentType = "image/jpeg";


bitmap.Save(Response.OutputStream, ImageFormat.Jpeg);

字符串颜色

以两种方式添加字符串颜色... 


 //creating a image object
System.Drawing.Image bitmap = (System.Drawing.Image)Bitmap.FromFile(Server.MapPath("onam.jpg")); // set image 
//draw the image object using a Graphics object
Graphics graphicsImage = Graphics.FromImage(bitmap);

//Set the alignment based on the coordinates

StringFormat stringformat = new StringFormat();
stringformat.Alignment = StringAlignment.Far;
stringformat.LineAlignment = StringAlignment.Far;


StringFormat stringformat2 = new StringFormat();
stringformat2.Alignment = StringAlignment.Center;
stringformat2.LineAlignment = StringAlignment.Center;


//Set the font color/format/size etc..

Color StringColor = System.Drawing.ColorTranslator.FromHtml("#933eea");//direct color adding
Color StringColor2 = System.Drawing.ColorTranslator.FromHtml("#e80c88");//customise color adding
string Str_TextOnImage = "Happy";//Your Text On Image
string Str_TextOnImage2 = "Onam";//Your Text On Image


graphicsImage.DrawString(Str_TextOnImage, new Font("arial", 40,
FontStyle.Regular), new SolidBrush(StringColor), new Point(268, 245),
stringformat); Response.ContentType = "image/jpeg";


graphicsImage.DrawString(Str_TextOnImage2, new Font("Edwardian Script ITC", 111,
FontStyle.Bold), new SolidBrush(StringColor2), new Point(145, 255),
stringformat2); Response.ContentType = "image/jpeg";


bitmap.Save(Response.OutputStream, ImageFormat.Jpeg);

重要部分

命名空间

以下命名空间包含 Graphics、Bitmaps、Image Editing 和 Alignment 等库。 


 //creating a image object
System.Drawing.Image bitmap = (System.Drawing.Image)Bitmap.FromFile(Server.MapPath("onam.jpg")); // set image 
//draw the image object using a Graphics object
Graphics graphicsImage = Graphics.FromImage(bitmap);

//Set the alignment based on the coordinates

StringFormat stringformat = new StringFormat();
stringformat.Alignment = StringAlignment.Far;
stringformat.LineAlignment = StringAlignment.Far;


StringFormat stringformat2 = new StringFormat();
stringformat2.Alignment = StringAlignment.Center;
stringformat2.LineAlignment = StringAlignment.Center;


//Set the font color/format/size etc..

Color StringColor = System.Drawing.ColorTranslator.FromHtml("#933eea");//direct color adding
Color StringColor2 = System.Drawing.ColorTranslator.FromHtml("#e80c88");//customise color adding
string Str_TextOnImage = "Happy";//Your Text On Image
string Str_TextOnImage2 = "Onam";//Your Text On Image


graphicsImage.DrawString(Str_TextOnImage, new Font("arial", 40,
FontStyle.Regular), new SolidBrush(StringColor), new Point(268, 245),
stringformat); Response.ContentType = "image/jpeg";


graphicsImage.DrawString(Str_TextOnImage2, new Font("Edwardian Script ITC", 111,
FontStyle.Bold), new SolidBrush(StringColor2), new Point(145, 255),
stringformat2); Response.ContentType = "image/jpeg";


bitmap.Save(Response.OutputStream, ImageFormat.Jpeg);

输出


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