MES_Client/TGMES/Core.Mes.Client.Comm/Control/PictureBoxHelper.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.IO;
using System.Linq;
using System.Text;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

namespace Core.Mes.Client.Comm.Control
{
    /// <summary>
    /// PictureBox图片处理类
    /// </summary>
    public class PictureBoxHelper
    {
        /// <summary>
        /// PictureBox显示缩略图
        /// </summary>
        /// <param name="imagebytes">图片二进制数组</param>
        /// <param name="pic">显示图片的PictureBox</param>
        public static void LoadThumbnailImage(byte[] imagebytes, PictureBox pic)
        {
            LoadThumbnailImage(imagebytes, pic, pic.Width, pic.Height);
        }

        /// <summary>
        /// PictureBox显示缩略图
        /// </summary>
        /// <param name="imagebytes">图片二进制数组</param>
        /// <param name="pic">显示图片的PictureBox</param>
        /// <param name="Width">显示宽度</param>
        /// <param name="Height">显示高度</param>
        public static void LoadThumbnailImage(byte[] imagebytes, PictureBox pic, int Width, int Height)
        {
            if (imagebytes != null && imagebytes.Length > 0 && pic != null)
            {
                MemoryStream stream = new MemoryStream(imagebytes, true); // 创建一个内存流，支持写入，用于存放图片二进制数据
                stream.Write(imagebytes, 0, imagebytes.Length);
                Bitmap bitmap = new Bitmap(stream);
                stream.Close();
                Image.GetThumbnailImageAbort myCallback = new Image.GetThumbnailImageAbort(ThumbnailCallback);

                int originalWidth = bitmap.Width;//图片实际宽度
                int originalHeight = bitmap.Height;//图片实际高度

                //图片显示宽度 按宽高比计算
                int showWidth = ((double)Width / originalWidth > (double)Height / originalHeight) ? Convert.ToInt32(Math.Round((double)originalWidth * Height / originalHeight, 0)) : Width;
                //图片显示高度
                int showHeight = ((double)Width / originalWidth > (double)Height / originalHeight) ? Height : Convert.ToInt32(Math.Round((double)originalHeight * Width / originalWidth, 0));

                Image image = bitmap.GetThumbnailImage(showWidth, showHeight, myCallback, IntPtr.Zero);
                //return myImage;
                pic.SizeMode = PictureBoxSizeMode.CenterImage;
                pic.Image = image;
            }
        }

        /// <summary>
        /// PictureBox显示缩略图(如果图片小于PictureBox的大小，则不进行缩放。)
        /// </summary>
        /// <param name="imagebytes">图片二进制数组</param>
        /// <param name="pic">显示图片的PictureBox</param>
        /// <param name="Width">显示宽度</param>
        /// <param name="Height">显示高度</param>
        public static void LoadThumbnailImage(Bitmap srcImg, PictureBox pic)
        {
            try
            {
                if (srcImg == null)
                {
                    if (pic.Image != null)
                    {
                        pic.Image.Dispose();
                    }
                    return;
                }
                //Image.GetThumbnailImageAbort myCallback = new Image.GetThumbnailImageAbort(ThumbnailCallback);

                //int Width = pic.Width;
                //int Height = pic.Height;

                //int originalWidth = bitmap.Width;//图片实际宽度
                //int originalHeight = bitmap.Height;//图片实际高度

                //if (Width >= originalWidth && Height >= originalHeight) return;

                ////图片显示宽度 按宽高比计算
                //int showWidth = ((double)Width / originalWidth > (double)Height / originalHeight) ? Convert.ToInt32(Math.Round((double)originalWidth * Height / originalHeight, 0)) : Width;
                ////图片显示高度
                //int showHeight = ((double)Width / originalWidth > (double)Height / originalHeight) ? Height : Convert.ToInt32(Math.Round((double)originalHeight * Width / originalWidth, 0));

                //Image image = bitmap.GetThumbnailImage(showWidth, showHeight, myCallback, IntPtr.Zero);
                ////return myImage;
                //pic.SizeMode = PictureBoxSizeMode.CenterImage;
                //pic.Image = image;

                int destHeight = pic.Height;
                int destWidth = pic.Width;
                System.Drawing.Image imgSource = srcImg;
                System.Drawing.Imaging.ImageFormat thisFormat = imgSource.RawFormat;
                int sW = 0, sH = 0;
                // 按比例缩放           
                int sWidth = imgSource.Width;
                int sHeight = imgSource.Height;
                if (sHeight > destHeight || sWidth > destWidth)
                {
                    if ((sWidth * destHeight) > (sHeight * destWidth))
                    {
                        sW = destWidth;
                        sH = (destWidth * sHeight) / sWidth;
                    }
                    else
                    {
                        sH = destHeight;
                        sW = (sWidth * destHeight) / sHeight;
                    }
                }
                else
                {
                    sW = sWidth;
                    sH = sHeight;
                }
                Bitmap outBmp = new Bitmap(destWidth, destHeight);
                Graphics g = Graphics.FromImage(outBmp);
                g.Clear(Color.Transparent);
                // 设置画布的描绘质量         
                g.CompositingQuality = CompositingQuality.HighQuality;
                g.SmoothingMode = SmoothingMode.HighQuality;
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.DrawImage(imgSource, new Rectangle((destWidth - sW) / 2, (destHeight - sH) / 2, sW, sH), 0, 0, imgSource.Width, imgSource.Height, GraphicsUnit.Pixel);
                g.Dispose();
                // 以下代码为保存图片时，设置压缩质量     
                EncoderParameters encoderParams = new EncoderParameters();
                long[] quality = new long[1];
                quality[0] = 100;
                EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
                encoderParams.Param[0] = encoderParam;
                //if (pic.Image == outBmp)
                //{
                //    pic.Image.Dispose();
                //}
                if (pic.Image != null)
                {
                    pic.Image.Dispose();
                }
                pic.Image = outBmp;
            }
            catch (Exception ex)
            {

            }
        }

        public static bool ThumbnailCallback()
        {
            return false;
        }

        /// <summary>
        /// PictureBox显示缩略图(如果图片小于PictureBox的大小，则不进行缩放。)
        /// </summary>
        /// <param name="imagebytes">图片二进制数组</param>
        /// <param name="pic">显示图片的PictureBox</param>
        /// <param name="Width">显示宽度</param>
        /// <param name="Height">显示高度</param>
        public static void LoadThumbnailImage(PictureBox pic)
        {
            if (pic.Image == null) return;
            Bitmap bitmap = (Bitmap)pic.Image;
            Image.GetThumbnailImageAbort myCallback = new Image.GetThumbnailImageAbort(ThumbnailCallback);

            int Width = pic.Width;
            int Height = pic.Height;

            int originalWidth = bitmap.Width;//图片实际宽度
            int originalHeight = bitmap.Height;//图片实际高度

            if (Width >= originalWidth && Height >= originalHeight) return;

            //图片显示宽度 按宽高比计算
            int showWidth = ((double)Width / originalWidth > (double)Height / originalHeight) ? Convert.ToInt32(Math.Round((double)originalWidth * Height / originalHeight, 0)) : Width;
            //图片显示高度
            int showHeight = ((double)Width / originalWidth > (double)Height / originalHeight) ? Height : Convert.ToInt32(Math.Round((double)originalHeight * Width / originalWidth, 0));

            Image image = bitmap.GetThumbnailImage(showWidth, showHeight, myCallback, IntPtr.Zero);
            //return myImage;
            pic.SizeMode = PictureBoxSizeMode.CenterImage;
            pic.Image = image;
        }
    }
}