用于客户端的 http://jcrop.org/
http://jcrop.org/demos/basic
public static class ImageHelper
{
public static byte[] CropImage(byte[] content, int x, int y, int width, int height)
{
using (MemoryStream stream = new MemoryStream(content))
{
return CropImage(stream, x, y, width, height);
}
}
public static byte[] CropImage(Stream content, int x, int y, int width, int height)
{
using (Bitmap sourceBitmap = new Bitmap(content))
{
double sourceWidth = Convert.ToDouble(sourceBitmap.Size.Width);
double sourceHeight = Convert.ToDouble(sourceBitmap.Size.Height);
Rectangle cropRect = new Rectangle(x, y, width, height);
using (Bitmap newBitMap = new Bitmap(cropRect.Width, cropRect.Height))
{
using (Graphics g = Graphics.FromImage(newBitMap))
{
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.SmoothingMode = SmoothingMode.HighQuality;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.CompositingQuality = CompositingQuality.HighQuality;
g.DrawImage(sourceBitmap, new Rectangle(0, 0, newBitMap.Width, newBitMap.Height), cropRect, GraphicsUnit.Pixel);
return GetBitmapBytes(newBitMap);
}
}
}
}
public static byte[] GetBitmapBytes(Bitmap source)
{
ImageCodecInfo codec = ImageCodecInfo.GetImageEncoders()[4];
EncoderParameters parameters = new EncoderParameters(1);
parameters.Param[0] = new EncoderParameter(Encoder.Quality, 100L);
using (MemoryStream tmpStream = new MemoryStream())
{
source.Save(tmpStream, codec, parameters);
byte[] result = new byte[tmpStream.Length];
tmpStream.Seek(0, SeekOrigin.Begin);
tmpStream.Read(result, 0, (int)tmpStream.Length);
return result;
}
}
public static Image Resize(Image current, int maxWidth, int maxHeight)
{
int width, height;
#region reckon size
if (current.Width > current.Height)
{
width = maxWidth;
height = Convert.ToInt32(current.Height * maxHeight / (double)current.Width);
}
else
{
width = Convert.ToInt32(current.Width * maxWidth / (double)current.Height);
height = maxHeight;
}
#endregion
#region get resized bitmap
var canvas = new Bitmap(width, height);
using (var graphics = Graphics.FromImage(canvas))
{
graphics.CompositingQuality = CompositingQuality.HighSpeed;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.CompositingMode = CompositingMode.SourceCopy;
graphics.DrawImage(current, 0, 0, width, height);
}
return canvas;
#endregion
}
public static Image byteArrayToImage(byte[] byteArrayIn)
{
MemoryStream ms = new MemoryStream(byteArrayIn);
Image returnImage = Image.FromStream(ms);
return returnImage;
}
public static byte[] imageToByteArray(Image image)
{
using (var ms = new MemoryStream())
{
image.Save(ms, image.RawFormat);
return ms.ToArray();
}
}
}
在控制器中可以这样使用
int cropPointX = Convert.ToInt32(model.imgX1);
int cropPointY = Convert.ToInt32(model.imgY1);
int imageCropWidth = Convert.ToInt32(model.imgWidth);
int imageCropHeight = Convert.ToInt32(model.imgHeight);
byte[] imageBytes = ConvertToBytes(model.ProductImage);
byte[] croppedImage;
if (cropPointX > 0 || cropPointY > 0 || imageCropWidth > 0 || imageCropHeight > 0)
{
croppedImage = CropImage(imageBytes, cropPointX, cropPointY, imageCropWidth, imageCropHeight);
}
else
{
croppedImage = imageBytes;
}
Stream stream = new MemoryStream(croppedImage);
Image img = Image.FromStream(stream, true, true);
if (img.Height > 522 || img.Width > 522)
{
img = Resize(img, 522, 522);
}
byte[] imageBytes = (byte[])(new ImageConverter()).ConvertTo(img, typeof(byte[]));
在 imageBytes 中，您将获得裁剪和调整大小后的图像。您可以将图像存储在数据库或文件夹中的任何位置。
