C# ASP.NET 图片处理的代码 _c# web 图片处理-优快云博客

主要的功能
1. Add Water Mark to Image    加图片水印, 支持自定义透明度
2. Add Characters to Image   加文字水印
3. Add Border to Image         加边框
4. ReSize the Image       改变图片大小, 正在做, doing...
5. Cut the Image        剪切图片, 还没来得及做, Next...
6. Read Exif from Image     读取图片的 Exif 信息, 还没来得及做, Next...

* Create by Alex Bai @ 2005-04-11 23:05

* Description: a Image Dll about Operation to Image

* 1. Add Water Mark to Image

* 2. Add Characters to Image

* 3. Add Border to Image

* 4. ReSize the Image doing

* 5. Cut the Image Next

* 6. Read Exif from Image Next

* 加上了可以选择水印图片透明度的功能，但是这样需要对水印图片进行索引，比较慢

* 所以如果不选择透明度的话，默认用另外一种不索引的方法

* */

using System;

using System.Drawing;

using System.Drawing.Imaging;

namespace Alex.ImageExt

{

#region Public Class

/// <summary>

/// Image Ext.

/// </summary>

public class ImageExt

{

#region 构造函数

public ImageExt()

{

// TODO: 在此处添加构造函数逻辑

}

#endregion

#region Add Water Mark to Image

#region Image X, Y

/// <summary>

/// Draw WaterMark to Src Image

/// </summary>

/// <param name="srcImage">Src Image</param>

/// <param name="waterMark">WaterMark Image</param>

/// <param name="x">WaterMark's Location X</param>

/// <param name="y">WaterMark's Location Y</param>

/// <returns>Image</returns>

public Image DrawWaterMark(Image srcImage, Image waterMark, int x, int y)

{

Graphics g = Graphics.FromImage(srcImage);

g.DrawImage(waterMark, x, y);

g.Dispose();

return srcImage;

}

#endregion

#region Image X, Y + Alpha Rate

/// <summary>

/// Draw WaterMark to Src Image

/// </summary>

/// <param name="srcImage">Src Image</param>

/// <param name="waterMark">WaterMark Image</param>

/// <param name="x">WaterMark's Location X</param>

/// <param name="y">WaterMark's Location Y</param>

/// <param name="alphaRate">WaterMark's alpha rate, 0 to 255, 0 means total transparent, 255 means don't transparent</param>

/// <returns>Image</returns>

public Image DrawWaterMark(Image srcImage, Image waterMark, int x, int y, int alphaRate)

{

Graphics g = Graphics.FromImage(srcImage);

if(alphaRate < 0 || alphaRate > 255)

alphaRate = 255;

//Transfer Image to Bitmap to Get Pixel

Bitmap bmWaterMark = new Bitmap(waterMark);

for(int ix = 0; ix < waterMark.Width; ix ++)

{

for(int iy = 0; iy < waterMark.Height; iy ++)

{

int ir = bmWaterMark.GetPixel(ix, iy).R;

int ig = bmWaterMark.GetPixel(ix, iy).G;

int ib = bmWaterMark.GetPixel(ix, iy).B;

g.DrawEllipse(new Pen(new SolidBrush(Color.FromArgb(alphaRate, ir, ig, ib))), x + ix, y + iy, 1, 1);

}

g.Dispose();

return srcImage;

}

#endregion

#region Image Postion

/// <summary>

/// Draw WaterMark to Src Image

/// </summary>

/// <param name="srcImage">Src Image</param>

/// <param name="waterMark">WaterMark Image</param>

/// <param name="oPosition">WaterMark's position</param>

/// <returns>Image</returns>

public Image DrawWaterMark(Image srcImage, Image waterMark, ImagePostion oPosition)

{

int x = 0;

int y = 0;

#region Switch Postion get X and Y

switch(oPosition)

{

case ImagePostion.TopLeft :

x = 0;

y = 0;

break;

case ImagePostion.TopCenter :

x = (srcImage.Width / 2) - (waterMark.Width / 2);

y = 0;

break;

case ImagePostion.TopRight :

x = srcImage.Width - waterMark.Width;

y = 0;

break;

case ImagePostion.MiddleLeft :

x = 0;

y = (srcImage.Height / 2) - (waterMark.Height / 2);

break;

case ImagePostion.MiddleMost :

x = (srcImage.Width / 2) - (waterMark.Width / 2);

y = (srcImage.Height / 2) - (waterMark.Height / 2);

break;

case ImagePostion.MiddleRight :

x = srcImage.Width - waterMark.Width;

y = (srcImage.Height / 2) - (waterMark.Height / 2);

break;

case ImagePostion.BottomLeft :

x = 0;

y = srcImage.Height - waterMark.Height;

break;

case ImagePostion.BottomCenter :

x = (srcImage.Width / 2) - (waterMark.Width / 2);

y = srcImage.Height - waterMark.Height;

break;

case ImagePostion.BottonRight :

x = srcImage.Width - waterMark.Width;

y = srcImage.Height - waterMark.Height;

break;

default :

break;

}

#endregion

srcImage = DrawWaterMark(srcImage, waterMark, x, y);

return srcImage;

}

#endregion

#region Image Postion + Alpha Rate

/// <summary>

/// Draw WaterMark to Src Image

/// </summary>

/// <param name="srcImage">Src Image</param>

/// <param name="waterMark">WaterMark Image</param>

/// <param name="oPosition">WaterMark's position</param>

/// <param name="alphaRate">WaterMark's alpha rate, 0 to 255, 0 means total transparent, 255 means don't transparent</param>

/// <returns>Image</returns>

public Image DrawWaterMark(Image srcImage, Image waterMark, ImagePostion oPosition, int alphaRate)

{

int x = 0;

int y = 0;

#region Switch Postion get X and Y

switch(oPosition)

{

case ImagePostion.TopLeft :

x = 0;

y = 0;

break;

case ImagePostion.TopCenter :

x = (srcImage.Width / 2) - (waterMark.Width / 2);

y = 0;

break;

case ImagePostion.TopRight :

x = srcImage.Width - waterMark.Width;

y = 0;

break;

case ImagePostion.MiddleLeft :

x = 0;

y = (srcImage.Height / 2) - (waterMark.Height / 2);

break;

case ImagePostion.MiddleMost :

x = (srcImage.Width / 2) - (waterMark.Width / 2);

y = (srcImage.Height / 2) - (waterMark.Height / 2);

break;

case ImagePostion.MiddleRight :

x = srcImage.Width - waterMark.Width;

y = (srcImage.Height / 2) - (waterMark.Height / 2);

break;

case ImagePostion.BottomLeft :

x = 0;

y = srcImage.Height - waterMark.Height;

break;

case ImagePostion.BottomCenter :

x = (srcImage.Width / 2) - (waterMark.Width / 2);

y = srcImage.Height - waterMark.Height;

break;

case ImagePostion.BottonRight :

x = srcImage.Width - waterMark.Width;

y = srcImage.Height - waterMark.Height;

break;

default :

break;

}

#endregion

srcImage = DrawWaterMark(srcImage, waterMark, x, y, alphaRate);

return srcImage;

}

#endregion

#region Add Characters To Image

#region Text X, Y

/// <summary>

/// Draw Characters to Image

/// </summary>

/// <param name="srcImage">Src Image</param>

/// <param name="text">Text to add</param>

/// <param name="textFont">Font of Text</param>

/// <param name="textSize">Size of Text</param>

/// <param name="textColor">Color of Text</param>

/// <param name="x">Text's Location X</param>

/// <param name="y">Text's Location Y</param>

/// <returns>Image</returns>

public Image DrawCharacter(Image srcImage, string text, string textFont, float textSize, Color textColor, float x, float y)

{

Graphics g = Graphics.FromImage(srcImage);

Font f = new Font(textFont, textSize);

Brush b = new SolidBrush(textColor);

g.DrawString(text, f, b, x, y);

g.Dispose();

return srcImage;

}

#endregion

#region Text Postion

/// <summary>

/// Draw Characters to Image

/// </summary>

/// <param name="srcImage">Src Image</param>

/// <param name="text">Text to add</param>

/// <param name="textFont">Font of Text</param>

/// <param name="textSize">Size of Text</param>

/// <param name="textColor">Color of Text</param>

/// <param name="oPosition">Position of Text</param>

/// <returns>Image</returns>

public Image DrawCharacter(Image srcImage, string text, string textFont, float textSize, Color textColor, ImagePostion oPosition)

{

float x = 0;

float y = 0;

//Get the text's Width and Height

Bitmap bm = new Bitmap(0, 0);

Graphics g = Graphics.FromImage(bm);

Font f = new Font(textFont, textSize);

SizeF size =g.MeasureString(text, f);

//float textLength = text.Length * textSize;

float textWidth = size.Width;

float textHeight = size.Height;

#region Switch Postion get X and Y

switch(oPosition)

{

case ImagePostion.TopLeft :

x = 0;

y = 0;

break;

case ImagePostion.TopCenter :

x = (srcImage.Width / 2) - (textWidth / 2);

y = 0;

break;

case ImagePostion.TopRight :

x = srcImage.Width - textWidth;

y = 0;

break;

case ImagePostion.MiddleLeft :

x = 0;

y = (srcImage.Height / 2) - (textHeight / 2);

break;

case ImagePostion.MiddleMost :

x = (srcImage.Width / 2) - (textWidth / 2);

y = (srcImage.Height / 2) - (textHeight / 2);

break;

case ImagePostion.MiddleRight :

x = srcImage.Width - textWidth;

y = (srcImage.Height / 2) - (textHeight / 2);

break;

case ImagePostion.BottomLeft :

x = 0;

y = srcImage.Height - textSize;

break;

case ImagePostion.BottomCenter :

x = (srcImage.Width / 2) - (textWidth / 2);

y = srcImage.Height - textHeight;

break;

case ImagePostion.BottonRight :

x = srcImage.Width - textWidth;

y = srcImage.Height - textHeight;

break;

default :

break;

}

#endregion

srcImage = DrawCharacter(srcImage, text, textFont, textSize, textColor, x, y);

return srcImage;

}

#endregion

#region Add Border to Image

#region BorderStyle

/// <summary>

/// Add Border to Image

/// </summary>

/// <param name="srcImage">Src Image</param>

/// <param name="borderColor">Border Color</param>

/// <param name="borderSize">Border Size</param>

/// <param name="borderStyle">Border Style, Default All</param>

/// <returns>Image</returns>

public Image AddBorder(Image srcImage, Color borderColor, int borderWidth, BorderStyle borderStyle)

{

Graphics g = Graphics.FromImage(srcImage);

Pen oPen = new Pen(borderColor, borderWidth);

int x = 0;

int y = 0;

int width = 0;

int height = 0;

switch(borderStyle)

{

case BorderStyle.All:

AddBorder(srcImage, borderColor, borderWidth);

return srcImage;

case BorderStyle.Top:

width = srcImage.Width;

height = borderWidth;

break;

case BorderStyle.Left:

width = borderWidth;

height = srcImage.Height;

break;

case BorderStyle.Right:

x = srcImage.Width - borderWidth;

width = borderWidth;

height = srcImage.Height;

break;

case BorderStyle.Bottom:

y = srcImage.Height - borderWidth;

width = srcImage.Width;

height = borderWidth;

break;

}

g.DrawRectangle(oPen, x, y, width, height);

return srcImage;

}

#endregion

#region Border Style Default All

/// <summary>

/// Add Border to Image

/// </summary>

/// <param name="srcImage">Src Image</param>

/// <param name="borderColor">Border Color</param>

/// <param name="borderSize">Border Size</param>

/// <returns></returns>

public Image AddBorder(Image srcImage, Color borderColor, int borderWidth)

{

Graphics g = Graphics.FromImage(srcImage);

Pen oPen = new Pen(borderColor, borderWidth);

int x = 0;

int y = 0;

int width = 0;

int height = 0;

//依次按照上左右下的顺序开始绘制边框

//Top

width = srcImage.Width;

height = borderWidth;

g.DrawRectangle(oPen, x, y, width, height);

//Left

width = borderWidth;

height = srcImage.Height;

g.DrawRectangle(oPen, x, y, width, height);

//Right

x = srcImage.Width - borderWidth;

width = borderWidth;

height = srcImage.Height;

g.DrawRectangle(oPen, x, y, width, height);

//Bottom

x = 0;

y = srcImage.Height - borderWidth;

width = srcImage.Width;

height = borderWidth;

g.DrawRectangle(oPen, x, y, width, height);

return srcImage;

}

#endregion

#region ReSize the Image

public Image ReSizeImage(Image srcImage)

{

return srcImage;

}

#endregion

}

#endregion

#region Public Enum

#region Positon Enum

/// <summary>

/// Water Mark Positon Enum, Total 9 positions

/// </summary>

public enum ImagePostion

{

TopLeft,

TopCenter,

TopRight,

MiddleLeft,

MiddleMost,

MiddleRight,

BottomLeft,

BottomCenter,

BottonRight

}

#endregion

#region Border Style Enum

/// <summary>

/// Border Style

/// </summary>

public enum BorderStyle

{

All,

Top,

Left,

Right,

Bottom

}

#endregion

}