private void OnUpload(UploadEventArgs args)
{
UploadEvent handler = MUpload;
if (handler != null)
{
handler(this, args);
}
}
/// <summary>
/// 图片等比缩放
/// </summary>
/// <param name="postedFile">原图HttpPostedFile对象</param>
/// <param name="targetWidth">指定的最大宽度</param>
/// <param name="targetHeight">指定的最大高度</param>
/// <param name="watermarkText">水印文字(为""表示不使用水印)</param>
/// <param name="watermarkImage">水印图片路径(为""表示不使用水印)</param>
public void ZoomAuto(byte[] postedFile, int targetWidth, int targetHeight, string watermarkText, string watermarkImage)
{
if (postedFile == null)
{
return;
}
//原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）
var stream = new MemoryStream(postedFile);
Image initImage = Image.FromStream(stream, true);
//原图宽高均小于模版，不作处理，直接保存
if (initImage.Width <= targetWidth && initImage.Height <= targetHeight)
{
////生成新图
////新建一个bmp图片
//initImage = new Bitmap(initImage.Width, initImage.Height);
////新建一个画板
//Graphics newG = Graphics.FromImage(initImage);
////设置质量
//newG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
//newG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
////置背景色
//newG.Clear(Color.White);
////画图
//newG.DrawImage(initImage, new Rectangle(0, 0, initImage.Width, initImage.Height), new Rectangle(0, 0, initImage.Width, initImage.Height), GraphicsUnit.Pixel);
//生成新图
//新建一个bmp图片
Image newImage = new Bitmap(initImage.Width, initImage.Height);
//新建一个画板
Graphics newG = Graphics.FromImage(newImage);
//设置质量
newG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
newG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//置背景色
newG.Clear(Color.White);
//画图
newG.DrawImage(initImage, new Rectangle(0, 0, initImage.Width, initImage.Height),
new Rectangle(0, 0, initImage.Width, initImage.Height), GraphicsUnit.Pixel);
//文字水印
if (watermarkText != "")
{
using (Graphics gWater = Graphics.FromImage(initImage))
{
var fontWater = new Font("黑体", 10);
Brush brushWater = new SolidBrush(Color.White);
gWater.DrawString(watermarkText, fontWater, brushWater, 10, 10);
gWater.Dispose();
}
}
//透明图片水印
if (watermarkImage != "")
{
if (File.Exists(watermarkImage))
{
//获取水印图片
using (Image wrImage = GetWatermark(initImage.Width, initImage.Height))
{
//水印绘制条件：原始图片宽高均大于或等于水印图片
if (initImage.Width >= wrImage.Width && initImage.Height >= wrImage.Height)
{
Graphics gWater = Graphics.FromImage(initImage);
//透明属性
var imgAttributes = new ImageAttributes();
//var colorMap = new ColorMap
// {
// OldColor = Color.FromArgb(0, 0, 0, 0),
// NewColor = Color.FromArgb(0, 0, 0, 0)
// };
//ColorMap[] remapTable = { colorMap };
//imgAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
float[][] colorMatrixElements =
{
new[] { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f },
new[] { 0.0f, 1.0f, 0.0f, 0.0f, 0.0f },
new[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f },
new[] { 0.0f, 0.0f, 0.0f, 0.1f, 0.0f },
new[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }
};
var wmColorMatrix = new ColorMatrix(colorMatrixElements);
imgAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
gWater.DrawImage(wrImage, new Rectangle(initImage.Width - wrImage.Width, initImage.Height - wrImage.Height, wrImage.Width, wrImage.Height), 0, 0, wrImage.Width, wrImage.Height, GraphicsUnit.Pixel, imgAttributes);
gWater.Dispose();
}
wrImage.Dispose();
}
}
}
var args = new UploadEventArgs {
UploadImage = initImage, FileName = FileName, MidFilepath = MidFilepath
};
OnUpload(args);
//保存
SavePath = args.SaveFileName;
if (!string.IsNullOrWhiteSpace(SavePath))
{
if (File.Exists(SavePath))
{
File.Delete(SavePath);
}
initImage.Save(SavePath, ImageFormat.Jpeg);
}
}
else
{
//缩略图宽、高计算
int newWidth = initImage.Width;
int newHeight = initImage.Height;
//宽大于高或宽等于高（横图或正方）
if (initImage.Width > initImage.Height || initImage.Width == initImage.Height)
{
//如果宽大于模版
if (initImage.Width > targetWidth)
{
//宽按模版，高按比例缩放
newWidth = targetWidth;
var height = initImage.Height * (targetWidth / Convert.ToDouble(initImage.Width));
newHeight = (int)height;
}
}
//高大于宽（竖图）
else
{
//如果高大于模版
if (initImage.Height > targetHeight)
{
//高按模版，宽按比例缩放
newHeight = targetHeight;
var width = initImage.Width * (targetHeight / initImage.Height);
newWidth = width;
}
}
//生成新图
//新建一个bmp图片
Image newImage = new Bitmap(newWidth, newHeight);
//新建一个画板
Graphics newG = Graphics.FromImage(newImage);
//设置质量
newG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
newG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//置背景色
newG.Clear(Color.White);
//画图
newG.DrawImage(initImage, new Rectangle(0, 0, newImage.Width, newImage.Height), new Rectangle(0, 0, initImage.Width, initImage.Height), GraphicsUnit.Pixel);
//文字水印
if (watermarkText != "")
{
using (var gWater = Graphics.FromImage(newImage))
{
var fontWater = new Font("宋体", 10);
var brushWater = new SolidBrush(Color.White);
gWater.DrawString(watermarkText, fontWater, brushWater, 10, 10);
gWater.Dispose();
}
}
//透明图片水印
if (watermarkImage != "")
{
if (File.Exists(watermarkImage))
{
//获取水印图片
using (Image wrImage = GetWatermark(newWidth, newHeight))
{
//水印绘制条件：原始图片宽高均大于或等于水印图片
if (newImage.Width >= wrImage.Width && newImage.Height >= wrImage.Height)
{
Graphics gWater = Graphics.FromImage(newImage);
//透明属性
var imgAttributes = new ImageAttributes();
//ColorMap colorMap = new ColorMap();
//colorMap.OldColor = Color.FromArgb(0, 0, 0, 0);
//colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
//ColorMap[] remapTable = { colorMap };
//imgAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
float[][] colorMatrixElements =
{
new[] { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f },
new[] { 0.0f, 1.0f, 0.0f, 0.0f, 0.0f },
new[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f },
new[] { 0.0f, 0.0f, 0.0f, 0.1f, 0.0f },
new[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }
};
var wmColorMatrix = new ColorMatrix(colorMatrixElements);
imgAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
gWater.DrawImage(wrImage, new Rectangle(newImage.Width - wrImage.Width, newImage.Height - wrImage.Height, wrImage.Width, wrImage.Height), 0, 0, wrImage.Width, wrImage.Height, GraphicsUnit.Pixel, imgAttributes);
gWater.Dispose();
}
wrImage.Dispose();
}
}
}
stream.Close();
//保存缩略图
var args = new UploadEventArgs {
UploadImage = newImage, FileName = FileName, MidFilepath = MidFilepath
};
OnUpload(args);
SavePath = args.SaveFileName;
if (!string.IsNullOrWhiteSpace(SavePath))
{
if (File.Exists(SavePath))
{
File.Delete(SavePath);
}
newImage.Save(SavePath, ImageFormat.Jpeg);
}
//释放资源
newG.Dispose();
newImage.Dispose();
initImage.Dispose();
}
}