/// <summary>
///上传图片 （有时候原图太大,存原图的话太浪费空间,这里根据高宽比例生成符合要求的图片）
/// </summary>
/// <param name="PostFile">需要上传的图片</param>
/// <param name="oldimgurl">旧的图片路径，用于删除</param>
/// <param name="path">图片存位置</param>
/// <param name="maxwidth">图片最大的宽度</param>
/// <param name="maxheight">图片最大的高度</param>
/// <param name="thumb_width">缩略图宽(缩略图宽高都为0则不生成缩略图)</param>
/// <param name="thumb_height">缩略图高(缩略图宽高都为0则不生成缩略图)</param>
/// <param name="imagename">图片名称，为空则为guid</param>
/// <returns>缩略图图片的相对路径</returns>
public static string UpImage(HttpPostedFile PostFile, string oldimgurl, string path, int maxwidth, int maxheight, int thumb_width, int thumb_height, string imagename, WaterMark waterMark = null, string mode = "HW")
{
string result = "";
//if (!IOHelper.ValidateImageType(PostFile))
//{
// return result;
//}
string extension = IOHelper.GetExtension(PostFile.FileName);
string ImgFileName;//图片名称
if (string.IsNullOrEmpty(imagename))
{
ImgFileName = Guid.NewGuid().ToString().Replace("-", "");
}
else
{
ImgFileName = imagename;
}
string fileName = ImgFileName + "." + extension; // 文件名称
string fileName_s = ImgFileName + "_s." + extension; // 缩略图文件名称加_s前缀
string JueDuiUrl = HttpContext.Current.Server.MapPath(path);
string xiangduiurl = path + "/" + fileName;
string xiangduiurl_s = path + "/" + fileName_s;
if (!Directory.Exists(JueDuiUrl))
{
Directory.CreateDirectory(JueDuiUrl);//如果不存在，则创建
}
string webFilePath = JueDuiUrl + "\\" + fileName; // 服务器端文件路径
string webFilePath_s = JueDuiUrl + "\\" + fileName_s; // 服务器端缩略图路径
if (!File.Exists(webFilePath))
{
using (System.Drawing.Image original_image = System.Drawing.Image.FromStream(PostFile.InputStream))
{
int width = original_image.Width;
int height = original_image.Height;
int new_width = width, new_height = height;
if (width > maxwidth || height > maxheight) //缩放
{
float target_ratio = (float)maxwidth / (float)maxheight;
float image_ratio = (float)width / (float)height;
if (target_ratio > image_ratio)
{
new_height = maxheight;
new_width = (int)Math.Floor(image_ratio * (float)maxheight);
}
else
{
new_height = (int)Math.Floor((float)maxwidth / image_ratio);
new_width = maxwidth;
}
}
using (System.Drawing.Bitmap final_image = new System.Drawing.Bitmap(new_width, new_height))
{
using (System.Drawing.Graphics graphic = System.Drawing.Graphics.FromImage(final_image))
{
////设置高质量插值法
graphic.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear;
////设置高质量,低速度呈现平滑程度
graphic.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.None;
graphic.DrawImage(original_image, new System.Drawing.Rectangle(0, 0, new_width, new_height),
new System.Drawing.Rectangle(0, 0, original_image.Width, original_image.Height), GraphicsUnit.Pixel);
#region 加水印
if (waterMark != null && waterMark.WaterMarkType_Thumb != 0)
{
ImageCodecInfo ici = null;
//加文字水印
if (waterMark.WaterMarkType_Thumb == 1)
{
Font drawFont = new Font(waterMark.WaterMarkFont, waterMark.WaterMarkFontSize, FontStyle.Regular, GraphicsUnit.Pixel);
SizeF crSize;
crSize = graphic.MeasureString(waterMark.WaterMarkText, drawFont);
float xpos = 0;
float ypos = 0;
switch (waterMark.WaterMarkPosition)
{
case 1:
xpos = (float)final_image.Width * (float).01;
ypos = (float)final_image.Height * (float).01;
break;
case 2:
xpos = ((float)final_image.Width * (float).50) - (crSize.Width / 2);
ypos = (float)final_image.Height * (float).01;
break;
case 3:
xpos = ((float)final_image.Width * (float).99) - crSize.Width;
ypos = (float)final_image.Height * (float).01;
break;
case 4:
xpos = (float)final_image.Width * (float).01;
ypos = ((float)final_image.Height * (float).50) - (crSize.Height / 2);
break;
case 5:
xpos = ((float)final_image.Width * (float).50) - (crSize.Width / 2);
ypos = ((float)final_image.Height * (float).50) - (crSize.Height / 2);
break;
case 6:
xpos = ((float)final_image.Width * (float).99) - crSize.Width;
ypos = ((float)final_image.Height * (float).50) - (crSize.Height / 2);
break;
case 7:
xpos = (float)final_image.Width * (float).01;
ypos = ((float)final_image.Height * (float).99) - crSize.Height;
break;
case 8:
xpos = ((float)final_image.Width * (float).50) - (crSize.Width / 2);
ypos = ((float)final_image.Height * (float).99) - crSize.Height;
break;
case 9:
xpos = ((float)final_image.Width * (float).99) - crSize.Width;
ypos = ((float)final_image.Height * (float).99) - crSize.Height;
break;
}
graphic.DrawString(waterMark.WaterMarkText, drawFont, new SolidBrush(Color.Red), xpos + 1, ypos + 1);
}
//大图加图片水印
else if (waterMark.WaterMarkType_Big == 2)
{
string waterImgUrl = HttpContext.Current.Server.MapPath("/" + waterMark.WaterMarkPic);
if (File.Exists(waterImgUrl)) //存在的话
{
using (Image watermark = new Bitmap(waterImgUrl))
{
if (watermark.Height >= final_image.Height || watermark.Width >= final_image.Width)
{
final_image.Save(webFilePath);
goto thumb;
}
ImageAttributes imageAttributes = new ImageAttributes();
ColorMap colorMap = new ColorMap();
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
float transparency = 0.5F;
if (waterMark.WaterMarkTransparency >= 1 && waterMark.WaterMarkTransparency <= 10)
{
transparency = (waterMark.WaterMarkTransparency / 10.0F);
}
float[][] colorMatrixElements =
{
new float[] { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f },
new float[] { 0.0f, 1.0f, 0.0f, 0.0f, 0.0f },
new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f },
new float[] { 0.0f, 0.0f, 0.0f, transparency, 0.0f },
new float[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }
};
ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
int xpos = 0;
int ypos = 0;
switch (waterMark.WaterMarkPosition)
{
case 1:
xpos = (int)(final_image.Width * (float).01);
ypos = (int)(final_image.Height * (float).01);
break;
case 2:
xpos = (int)((final_image.Width * (float).50) - (watermark.Width / 2));
ypos = (int)(final_image.Height * (float).01);
break;
case 3:
xpos = (int)((final_image.Width * (float).99) - (watermark.Width));
ypos = (int)(final_image.Height * (float).01);
break;
case 4:
xpos = (int)(final_image.Width * (float).01);
ypos = (int)((final_image.Height * (float).50) - (watermark.Height / 2));
break;
case 5:
xpos = (int)((final_image.Width * (float).50) - (watermark.Width / 2));
ypos = (int)((final_image.Height * (float).50) - (watermark.Height / 2));
break;
case 6:
xpos = (int)((final_image.Width * (float).99) - (watermark.Width));
ypos = (int)((final_image.Height * (float).50) - (watermark.Height / 2));
break;
case 7:
xpos = (int)(final_image.Width * (float).01);
ypos = (int)((final_image.Height * (float).99) - watermark.Height);
break;
case 8:
xpos = (int)((final_image.Width * (float).50) - (watermark.Width / 2));
ypos = (int)((final_image.Height * (float).99) - watermark.Height);
break;
case 9:
xpos = (int)((final_image.Width * (float).99) - (watermark.Width));
ypos = (int)((final_image.Height * (float).99) - watermark.Height);
break;
}
graphic.DrawImage(watermark, new Rectangle(xpos, ypos, watermark.Width, watermark.Height), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes);
}
}
else
{
final_image.Save(webFilePath);
goto thumb;
}
}
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
foreach (ImageCodecInfo codec in codecs)
{
if (codec.MimeType.IndexOf("jpeg") > -1)
{
ici = codec;
}
}
EncoderParameters encoderParams = new EncoderParameters();
long[] qualityParam = new long[1];
if (waterMark.WaterMarkImgQuality < 0 || waterMark.WaterMarkImgQuality > 100)
{
waterMark.WaterMarkImgQuality = 80;
}
qualityParam[0] = waterMark.WaterMarkImgQuality;
EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);
encoderParams.Param[0] = encoderParam;
if (ici != null)
{
final_image.Save(webFilePath, ici, encoderParams);
}
else
{
final_image.Save(webFilePath);
}
}
#endregion
else //直接保存
{
final_image.Save(webFilePath);
}
thumb:
//生成缩略图
if (thumb_width != 0 && thumb_height != 0)
{
MakeThumbnail(original_image, webFilePath_s, thumb_width, thumb_height, waterMark, mode);
result = xiangduiurl_s;
}
else
{
result = xiangduiurl;
}
}
}
}
}
if (!string.IsNullOrEmpty(oldimgurl))
{
IOHelper.DeleteImg(oldimgurl);
}
return(result);
}
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="original_image"></param>
/// <param name="thumbnailPath"></param>
/// <param name="thumb_width"></param>
/// <param name="thumb_height"></param>
public static void MakeThumbnail(System.Drawing.Image original_image, string thumbnailPath, int thumb_width, int thumb_height, WaterMark waterMark = null, string mode = "HW")
{
// Calculate the new width and height
int width = original_image.Width;
int height = original_image.Height;
int new_width = thumb_width, new_height = thumb_height;
int x = 0, y = 0, m = 0, n = 0;
switch (mode)
{
case "HW": //指定高宽缩放（可能变形）
break;
case "W": //指定宽，高按比例
new_height = original_image.Height * width / original_image.Width;
break;
case "H": //指定高，宽按比例
new_width = original_image.Width * height / original_image.Height;
break;
case "Cut": //指定高宽裁减（不变形）
if (original_image.Height > thumb_height || original_image.Width > thumb_width)
{
if ((double)original_image.Width / (double)original_image.Height > (double)thumb_width / (double)thumb_height)
{
height = original_image.Height;
width = original_image.Height * thumb_width / thumb_height;
}
else
{
width = original_image.Width;
height = original_image.Width * height / thumb_width;
}
}
break;
case "Fill":
if (original_image.Height > thumb_height || original_image.Width > thumb_width)
{
float target_ratio = (float)thumb_width / (float)thumb_height;
float image_ratio = (float)width / (float)height;
if (target_ratio > image_ratio)
{
new_height = thumb_height;
new_width = (int)Math.Floor(image_ratio * (float)thumb_height);
}
else
{
new_height = (int)Math.Floor((float)thumb_width / image_ratio);
new_width = thumb_width;
}
new_width = new_width > thumb_width ? thumb_width : new_width;
new_height = new_height > thumb_height ? thumb_height : new_height;
m = (thumb_width - new_width) / 2;
n = (thumb_height - new_height) / 2;
}
break;
}
using (System.Drawing.Bitmap final_image = new System.Drawing.Bitmap(thumb_width, thumb_height))
{
using (System.Drawing.Graphics graphic = System.Drawing.Graphics.FromImage(final_image))
{
graphic.FillRectangle(new System.Drawing.SolidBrush(System.Drawing.Color.Transparent), new System.Drawing.Rectangle(0, 0, thumb_width, thumb_height));
graphic.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear;
//graphic.DrawImage(original_image, paste_x, paste_y, original_image.Width, original_image.Height);
graphic.DrawImage(original_image, new System.Drawing.Rectangle(m, n, new_width, new_height),
new System.Drawing.Rectangle(x, y, original_image.Width, original_image.Height),
System.Drawing.GraphicsUnit.Pixel);
#region 加水印
if (waterMark != null && waterMark.WaterMarkType_Thumb != 0)
{
ImageCodecInfo ici = null;
//加文字水印
if (waterMark.WaterMarkType_Thumb == 1)
{
Font drawFont = new Font(waterMark.WaterMarkFont, waterMark.WaterMarkFontSize, FontStyle.Regular, GraphicsUnit.Pixel);
SizeF crSize;
crSize = graphic.MeasureString(waterMark.WaterMarkText, drawFont);
float xpos = 0;
float ypos = 0;
switch (waterMark.WaterMarkPosition)
{
case 1:
xpos = (float)final_image.Width * (float).01;
ypos = (float)final_image.Height * (float).01;
break;
case 2:
xpos = ((float)final_image.Width * (float).50) - (crSize.Width / 2);
ypos = (float)final_image.Height * (float).01;
break;
case 3:
xpos = ((float)final_image.Width * (float).99) - crSize.Width;
ypos = (float)final_image.Height * (float).01;
break;
case 4:
xpos = (float)final_image.Width * (float).01;
ypos = ((float)final_image.Height * (float).50) - (crSize.Height / 2);
break;
case 5:
xpos = ((float)final_image.Width * (float).50) - (crSize.Width / 2);
ypos = ((float)final_image.Height * (float).50) - (crSize.Height / 2);
break;
case 6:
xpos = ((float)final_image.Width * (float).99) - crSize.Width;
ypos = ((float)final_image.Height * (float).50) - (crSize.Height / 2);
break;
case 7:
xpos = (float)final_image.Width * (float).01;
ypos = ((float)final_image.Height * (float).99) - crSize.Height;
break;
case 8:
xpos = ((float)final_image.Width * (float).50) - (crSize.Width / 2);
ypos = ((float)final_image.Height * (float).99) - crSize.Height;
break;
case 9:
xpos = ((float)final_image.Width * (float).99) - crSize.Width;
ypos = ((float)final_image.Height * (float).99) - crSize.Height;
break;
}
graphic.DrawString(waterMark.WaterMarkText, drawFont, new SolidBrush(Color.White), xpos + 1, ypos + 1);
graphic.DrawString(waterMark.WaterMarkText, drawFont, new SolidBrush(Color.Black), xpos, ypos);
}
//大图加图片水印
else if (waterMark.WaterMarkType_Thumb == 2)
{
string waterImgUrl = HttpContext.Current.Server.MapPath("/" + waterMark.WaterMarkPic);
if (File.Exists(waterImgUrl)) //存在的话
{
using (Image watermark = new Bitmap(waterImgUrl))
{
if (watermark.Height >= final_image.Height || watermark.Width >= final_image.Width)
{
final_image.Save(thumbnailPath);
return;
}
ImageAttributes imageAttributes = new ImageAttributes();
ColorMap colorMap = new ColorMap();
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
float transparency = 0.5F;
if (waterMark.WaterMarkTransparency >= 1 && waterMark.WaterMarkTransparency <= 10)
{
transparency = (waterMark.WaterMarkTransparency / 10.0F);
}
float[][] colorMatrixElements =
{
new float[] { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f },
new float[] { 0.0f, 1.0f, 0.0f, 0.0f, 0.0f },
new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f },
new float[] { 0.0f, 0.0f, 0.0f, transparency, 0.0f },
new float[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }
};
ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
int xpos = 0;
int ypos = 0;
switch (waterMark.WaterMarkPosition)
{
case 1:
xpos = (int)(final_image.Width * (float).01);
ypos = (int)(final_image.Height * (float).01);
break;
case 2:
xpos = (int)((final_image.Width * (float).50) - (watermark.Width / 2));
ypos = (int)(final_image.Height * (float).01);
break;
case 3:
xpos = (int)((final_image.Width * (float).99) - (watermark.Width));
ypos = (int)(final_image.Height * (float).01);
break;
case 4:
xpos = (int)(final_image.Width * (float).01);
ypos = (int)((final_image.Height * (float).50) - (watermark.Height / 2));
break;
case 5:
xpos = (int)((final_image.Width * (float).50) - (watermark.Width / 2));
ypos = (int)((final_image.Height * (float).50) - (watermark.Height / 2));
break;
case 6:
xpos = (int)((final_image.Width * (float).99) - (watermark.Width));
ypos = (int)((final_image.Height * (float).50) - (watermark.Height / 2));
break;
case 7:
xpos = (int)(final_image.Width * (float).01);
ypos = (int)((final_image.Height * (float).99) - watermark.Height);
break;
case 8:
xpos = (int)((final_image.Width * (float).50) - (watermark.Width / 2));
ypos = (int)((final_image.Height * (float).99) - watermark.Height);
break;
case 9:
xpos = (int)((final_image.Width * (float).99) - (watermark.Width));
ypos = (int)((final_image.Height * (float).99) - watermark.Height);
break;
}
graphic.DrawImage(watermark, new Rectangle(xpos, ypos, watermark.Width, watermark.Height), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes);
}
}
else
{
final_image.Save(thumbnailPath);
return;
}
}
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
foreach (ImageCodecInfo codec in codecs)
{
if (codec.MimeType.IndexOf("jpeg") > -1)
{
ici = codec;
}
}
EncoderParameters encoderParams = new EncoderParameters();
long[] qualityParam = new long[1];
if (waterMark.WaterMarkImgQuality < 0 || waterMark.WaterMarkImgQuality > 100)
{
waterMark.WaterMarkImgQuality = 80;
}
qualityParam[0] = waterMark.WaterMarkImgQuality;
EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);
encoderParams.Param[0] = encoderParam;
if (ici != null)
{
final_image.Save(thumbnailPath, ici, encoderParams);
}
else
{
final_image.Save(thumbnailPath);
}
}
#endregion
else
{
final_image.Save(thumbnailPath);
}
}
}
}
