【asp】asp.net 添加水印的代码(已测试)-net-添加水印

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asp.net 添加水印的代码(已测试)

/// <summary>
/// 图片修改类,主要是用来保护图片版权的，版权归原作者所有
/// </summary>
public class picmark
{
#region "member fields"
private string modifyImagePath=null;
private string drawedImagePath=null;
private int rightSpace;
private int bottoamSpace;
private int lucencyPercent=70;
private string outPath=null;
#endregion
public picmark()
{
}
#region "propertys"
/// <summary>
/// 获取或设置要修改的图像路径
/// </summary>
public string ModifyImagePath
{
get { return this.modifyImagePath; }
set { this.modifyImagePath=value; }
}
/// <summary>
/// 获取或设置在画的图片路径(水印图片)
/// </summary>
public string DrawedImagePath
{
get { return this.drawedImagePath; }
set { this.drawedImagePath=value; }
}
/// <summary>
/// 获取或设置水印在修改图片中的右边距
/// </summary>
public int RightSpace
{
get { return this.rightSpace; }
set { this.rightSpace=value; }
}
//获取或设置水印在修改图片中距底部的高度
public int BottoamSpace
{
get { return this.bottoamSpace; }
set { this.bottoamSpace=value; }
}
/// <summary>
/// 获取或设置要绘制水印的透明度,注意是原来图片透明度的百分比
/// </summary>
public int LucencyPercent
{
get { return this.lucencyPercent; }
set
{
if (value >=0 && value <=100)
this.lucencyPercent=value;
}
}
/// <summary>
/// 获取或设置要输出图像的路径
/// </summary>
public string OutPath
{
get { return this.outPath; }
set { this.outPath=value; }
}
#endregion
#region "methods"
/// <summary>
/// 开始绘制水印
/// </summary>
public void DrawImage()
{
Image modifyImage=null;
Image drawedImage=null;
Graphics g=null;
try
{
//建立图形对象
modifyImage=Image.FromFile(this.ModifyImagePath);
drawedImage=Image.FromFile(this.DrawedImagePath);
g=Graphics.FromImage(modifyImage);
//获取要绘制图形坐标
int x=modifyImage.Width - this.rightSpace;
int y=modifyImage.Height - this.BottoamSpace;
//设置颜色矩阵
float[][] matrixItems={
new float[] {1, 0, 0, 0, 0},
new float[] {0, 1, 0, 0, 0},
new float[] {0, 0, 1, 0, 0},
new float[] {0, 0, 0, (float)this.LucencyPercent/100f, 0},
new float[] {0, 0, 0, 0, 1}};
ColorMatrix colorMatrix=new ColorMatrix(matrixItems);
ImageAttributes imgAttr=new ImageAttributes();
imgAttr.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
//绘制阴影图像
g.DrawImage(
drawedImage,
new Rectangle(x, y, drawedImage.Width, drawedImage.Height),
0, 0, drawedImage.Width, drawedImage.Height,
GraphicsUnit.Pixel, imgAttr);
//保存文件
string[] allowImageType={ ".jpg", ".gif", ".png", ".bmp", ".tiff", ".wmf", ".ico" };
FileInfo file=new FileInfo(this.ModifyImagePath);
ImageFormat imageType=ImageFormat.Gif;
switch (file.Extension.ToLower())
{
case ".jpg":
imageType=ImageFormat.Jpeg;
break;
case ".gif":
imageType=ImageFormat.Gif;
break;
case ".png":
imageType=ImageFormat.Png;
break;
case ".bmp":
imageType=ImageFormat.Bmp;
break;
case ".tif":
imageType=ImageFormat.Tiff;
break;
case ".wmf":
imageType=ImageFormat.Wmf;
break;
case ".ico":
imageType=ImageFormat.Icon;
break;
default:
break;
}
MemoryStream ms=new MemoryStream();
modifyImage.Save(ms, imageType);
byte[] imgData=ms.ToArray();
modifyImage.Dispose();
drawedImage.Dispose();
g.Dispose();
FileStream fs=null;
if (this.OutPath==null || this.OutPath=="")
{
File.Delete(this.ModifyImagePath);
fs=new FileStream(this.ModifyImagePath, FileMode.Create, FileAccess.Write);
}
else
{
fs=new FileStream(this.OutPath, FileMode.Create, FileAccess.Write);
}
if (fs !=null)
{
fs.Write(imgData, 0, imgData.Length);
fs.Close();
}
}
finally
{
try
{
drawedImage.Dispose();
modifyImage.Dispose();
g.Dispose();
}
catch { ;}
}
}
#endregion
}

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