/// <summary>
/// 生成缩略图
/// </summary>
public string ToThumbnailImage()
{
if (this.SourceImagePath.ToString() == System.String.Empty)
{
throw new NullReferenceException("SourceImagePath is null!");
}
string sExt = SourceImagePath.Substring(SourceImagePath.LastIndexOf(".")).ToLower();
if (!ExtensionValidator(sExt, 0))
{
throw new ArgumentException("原图片文件格式不正确,支持的格式有[ " + MimeDict.ExpandAndToString(",") + " ]", "SourceImagePath");
}
//从 原图片 创建 Image 对象
Image image = Image.FromFile(HttpContext.Current.Server.MapPath("~/" + this.SourceImagePath), false);
Bitmap bitmap = new Bitmap(this.ThumbnailImageWidth, this.ThumbnailImageHeight);
Graphics graphics = Graphics.FromImage(bitmap); //创建画板并加载空白图像
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; //设置保真模式为高度保真
graphics.DrawImage(image, new Rectangle(0, 0, this.ThumbnailImageWidth, this.ThumbnailImageHeight), 0, 0, image.Width, image.Height, GraphicsUnit.Pixel); //开始画图
image.Dispose();
try
{
//将此 原图片 以指定格式并用指定的编解码参数保存到指定文件
string savepath = (ThumbnailImagePath == null ? SourceImagePath : ThumbnailImagePath);
Random rd = new Random();
string fileName = DateTime.Now.ToString("yyyyMMddHHmmssfffffff") + sExt; //新文件名
string path = HttpContext.Current.Server.MapPath("~/" + savepath); //保存路径
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
bitmap.Save(string.Concat(path, "\\", fileName));
return(savepath + "/" + fileName);
}
catch (System.Exception e)
{
throw e;
}
finally
{
bitmap.Dispose();
graphics.Dispose();
}
}
/// <summary>
/// 生成水印图片
/// </summary>
/// <returns></returns>
public string ToWaterMark(string FileName, int wm_x, int wm_y)
{
#region 创建Image对象
string savepath = (SaveWaterMarkImagePath == null ? SourceImagePath : SaveWaterMarkImagePath);
string sExt = SourceImagePath.Substring(SourceImagePath.LastIndexOf(".")).ToLower();
if (this.SourceImagePath.ToString() == System.String.Empty)
{
throw new NullReferenceException("SourceImagePath is null!");
}
if (!ExtensionValidator(sExt, 0))
{
throw new ArgumentException("原图片文件格式不正确,支持的格式有[ " + MimeDict.Keys.ExpandAndToString(",") + " ]", "SourceImagePath");
}
//从 原图片 创建 Image 对象
System.IO.FileStream fs = System.IO.File.OpenRead(HttpContext.Current.Server.MapPath("~/" + this.SourceImagePath));
Image s_image = Image.FromStream(fs, true);
fs.Close();
int s_imagewidth = s_image.Width;
int s_imageheight = s_image.Height;
float s_imageHorizontalResolution = s_image.HorizontalResolution;
float s_imageVerticalResolution = s_image.VerticalResolution;
//指定的现有图像并使用指定的大小初始化 Bitmap 类的新实例
Bitmap s_bitmap = new Bitmap(s_image, s_imagewidth, s_imageheight);
s_image.Dispose();
//设置此 Bitmap 的分辨率[水平分辨率,垂直分辨率]
s_bitmap.SetResolution(72f, 72f);
/**/
////从指定的 原图片 创建新 Graphics 对象
Graphics s_textgraphics = Graphics.FromImage(s_bitmap);
try
{
if (this.WaterMarkText != null)
{
if (this.WaterMarkText.Trim().Length > 0)
{
//开始制作水印文字
//设置原图片的 对象呈现质量为消除锯齿的呈现
s_textgraphics.SmoothingMode = SmoothingMode.AntiAlias;
//在指定位置并且按指定大小绘制 原图片 对象的指定部分[要绘制的 Image 对象,所绘制图像的位置和大小将图像进行缩放以适合该矩形,左上角的 x 坐标,左上角的 y 坐标,绘制的源图像部分的宽度,绘制的源图像部分的高度,将设备像素指定为度量单位]
s_textgraphics.DrawImage(s_bitmap, new Rectangle(0, 0, s_imagewidth, s_imageheight), 0, 0, s_imagewidth, s_imageheight, GraphicsUnit.Pixel);
//
int[] fontsizeArray = new int[7] {
16, 14, 12, 10, 8, 6, 4
};
//保存水印文字的字体信息
Font wm_textfont = null;
//保存在 水印文字 参数中指定的、用 font 参数绘制的字符串的大小（以像素为单位）。
SizeF wm_textsize = new SizeF(0, 0);
for (int i = 0; i < fontsizeArray.Length; i++)
{
wm_textfont = new Font("arial", ((float)fontsizeArray[i]), FontStyle.Bold);
//测量用 wm_textfont 对象绘制的指定字符串
wm_textsize = s_textgraphics.MeasureString(this.WaterMarkText, wm_textfont);
//判断水印文字是否大于 原图片 的宽度
if (((ushort)wm_textsize.Width) < ((ushort)s_imagewidth))
{
break;
}
}
fontsizeArray = null;
float y = (((float)(s_imageheight - ((int)(((double)s_imageheight) * 0.05f)))) - (wm_textsize.Height / 2f));
float x = ((float)(s_imagewidth / 2));
//设置 水印文字 在布局矩形中居中对齐
StringFormat wm_textformat = new StringFormat();
wm_textformat.Alignment = StringAlignment.Center;
//绘制 水印文字 的阴影
s_textgraphics.DrawString(this.WaterMarkText, wm_textfont, new SolidBrush(Color.FromArgb(153, 0, 0, 0)), new PointF((x + 1f), (y + 1f)), wm_textformat);
//绘制 水印文字
s_textgraphics.DrawString(this.WaterMarkText, wm_textfont, new SolidBrush(Color.FromArgb(this.TextDiaphaneity, 255, 255, 255)), new PointF(x, y), wm_textformat);
wm_textformat.Dispose();
}
}
}
catch (System.Exception e)
{
throw e;
}
finally
{
s_textgraphics.Dispose();
}
#endregion
if (this.WaterMarkImagePath == null)
{
Random rd = new Random();
string fileName = FileName; //新文件名
string path = HttpContext.Current.Server.MapPath("~/" + savepath); //保存路径
s_bitmap.Save(string.Concat(path, "\\", fileName));
//删除原始图片
//IOHelper.DeleteFile(HttpContext.Current.Server.MapPath("~/" + this.SourceImagePath));
return(savepath + "/" + fileName);
}
if (this.WaterMarkImagePath.Trim() == System.String.Empty)
{
Random rd = new Random();
string fileName = FileName; //新文件名
string path = HttpContext.Current.Server.MapPath("~/" + savepath); //保存路径
s_bitmap.Save(string.Concat(path, "\\", fileName));
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
//删除原始图片
//IOHelper.DeleteFile(HttpContext.Current.Server.MapPath("~/" + this.SourceImagePath));
return(savepath + "/" + fileName);
}
//从 水印图片 创建 Image 对象
Image wm_image = Image.FromFile(HttpContext.Current.Server.MapPath("~/" + this.WaterMarkImagePath));
int wm_imagewidth = wm_image.Width; //num3
int wm_imageheight = wm_image.Height; //num4
if (s_imagewidth < wm_imagewidth || s_imageheight < (wm_imageheight * 2))
{
Random rd = new Random();
string fileName = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + "_" + rd.Next().ToString() + sExt; //新文件名
string path = HttpContext.Current.Server.MapPath("~/" + savepath); //保存路径
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
s_bitmap.Save(string.Concat(path, "\\", fileName));
//删除原始图片
//IOHelper.DeleteFile(HttpContext.Current.Server.MapPath("~/" + this.SourceImagePath));
return(savepath + "/" + fileName);
}
Bitmap s_bitmap2 = new Bitmap(s_bitmap);
s_bitmap.Dispose();
//设置分辨率
s_bitmap2.SetResolution(s_imageHorizontalResolution, s_imageVerticalResolution);
Graphics wm_imagegraphics = Graphics.FromImage(s_bitmap2);
ImageAttributes wm_imageattributes = new ImageAttributes();
/**/
////使用颜色重新映射表来调整图像颜色
ColorMap map = new ColorMap();
map.OldColor = Color.FromArgb(255, 0, 255, 0);
map.NewColor = Color.FromArgb(0, 0, 0, 0);
//为 水印图片 设置颜色重新映射表
wm_imageattributes.SetRemapTable(new ColorMap[] { map }, ColorAdjustType.Bitmap);
//为 水印图片 设置颜色调整矩阵
wm_imageattributes.SetColorMatrix(new ColorMatrix(new float[][] { new float[] { 1f, 0, 0, 0, 0 }, new float[] { 0, 1f, 0, 0, 0 }, new float[] { 0, 0, 1f, 0, 0 }, new float[] { 0, 0, 0, this.ImageDeaphaneity, 0 }, new float[] { 0, 0, 0, 0, 1f } }), ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
//int wm_x;
//int wm_y;
//GetWaterMarkPosition(ImageAlign.RightBottom, out wm_x, out wm_y, s_imagewidth, s_imageheight, wm_imagewidth, wm_imageheight);
//在 原图片 上按指定大小绘制 水印图片 对象的指定部分
wm_imagegraphics.DrawImage(wm_image, new Rectangle(wm_x, wm_y, wm_imagewidth, wm_imageheight), 0, 0, wm_imagewidth, wm_imageheight, GraphicsUnit.Pixel, wm_imageattributes);
wm_imageattributes.ClearColorMatrix();
wm_imageattributes.ClearRemapTable();
wm_image.Dispose();
wm_imagegraphics.Dispose();
try
{
//将 绘制水印图片后的图片 以指定格式并用指定的编解码参数保存到指定文件
Random rd = new Random();
string fileName = FileName; //新文件名
string path = HttpContext.Current.Server.MapPath("~/" + savepath); //保存路径
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
s_bitmap2.Save(string.Concat(path, "\\", fileName));
//删除原始图片
//IOHelper.DeleteFile(HttpContext.Current.Server.MapPath("~/" + this.SourceImagePath));
return(savepath + "/" + fileName);
}
catch (System.Exception e)
{
throw e;
}
finally
{
s_bitmap2.Dispose();
}
}
