图片裁剪PhotoCropper

作者佚名技术来源 NET编程浏览发布时间 2012-04-12

; protected void Page_Load(object sender, System.EventArgs e) { if (!Page.IsPostBack) { loadPhoto(ORIG_SAMPLE_PHOTO_URL); } else { loadPhoto(CROPPED_SAMPLE_PHOTO_URL); btnCrop.Visible = !btnCrop.Visible; btnReset.Visible = !btnReset.Visible; } } protected void loadPhoto(string url) { imgSample.ImageUrl = url; } protected void btnCrop_Click(object sender, EventArgs e) { int iWidth = Convert.ToInt16(width.Value); int iHeight = Convert.ToInt16(height.Value); int iX = Convert.ToInt16(x1.Value); int iY = Convert.ToInt16(y1.Value); //用字节流读取 byte[] rawData = File.ReadAllBytes(Context.Server.MapPath(""+ORIG_SAMPLE_PHOTO_URL+"")); byte[] newImage = CropImageFile(rawData, iWidth, iHeight, iX, iY); writeByteArrayToFile(newImage); } //重置 protected void btnReset_Click(object sender, EventArgs e) { Response.Redirect("PhotoCropper.aspx", true); } //字节数组换成图片文件

    protected void writeByteArrayToFile(byte[] byteImage) {
        using (BinaryWriter binWriter =
        new BinaryWriter(File.Open(Context.Server.MapPath("" + CROPPED_SAMPLE_PHOTO_URL + ""), FileMode.Create)))
        {
            binWriter.Write(byteImage);
        }
    }

    //裁剪
    protected byte[] CropImageFile(byte[] imageFile, int targetW, int targetH, int targetX, int targetY)
    {
        MemoryStream imgMemoryStream = new MemoryStream();
        System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(new MemoryStream(imageFile));

        Bitmap bmPhoto = new Bitmap(targetW, targetH, PixelFormat.Format24bppRgb);
        bmPhoto.SetResolution(72, 72);
   
        Graphics grPhoto = Graphics.FromImage(bmPhoto);
        grPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
        grPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
        grPhoto.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;

        try
        {
            grPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, targetW, targetH), targetX, targetY, targetW, targetH, GraphicsUnit.Pixel);
            bmPhoto.Save(imgMemoryStream, System.Drawing.Imaging.ImageFormat.Jpeg);
        }
        catch (Exception e)
        {
            throw e;
        }
        finally
        {
            imgPhoto.Dispose();
            bmPhoto.Dispose();
            grPhoto.Dispose();
        }
        return imgMemoryStream.GetBuffer();
    }

    //转换图片成子节流

    protected byte[] ConvertImageToByteArray(System.Drawing.Image imageToConvert )  
    {
        byte[] imgByteArray;
        try
        {
            using (MemoryStream imgMemoryStream = new MemoryStream())
            {               
                imageToConvert.Save(imgMemoryStream, Im

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