ECDefense/公共库/EC.Utils/ImageHelpers/ImageHelper_Thum.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;

namespace EC.Utils.ImageHelpers
{
	public enum JoinMode
	{
		Horizontal = 0,
		Vertical = 1
	}

	public partial class ImageHelper
	{
		public static bool IsImage(string fileName)
		{
			string imageType = FileUnit.GetFileExt(fileName);
			switch (imageType.ToLower())
			{
				case ".gif":

				case ".jpg":
				case ".jpeg":

				case ".bmp":

				case ".png":
					return true;

				default:
					return false;
			}
		}

		public static bool MakeThumbnail(string originalImagePath, string thumbnailPath)
		{
			int width = 100;
			int height = 100;
			string mode = "HW";
			string imageType = FileUnit.GetFileExt(thumbnailPath);// "jpg";
			return MakeThumbnail(originalImagePath, thumbnailPath, width, height, mode, imageType);
		}

		/// 生成缩略图
		/// </summary>
		/// <param name="originalImagePath">源图路径</param>
		/// <param name="thumbnailPath">缩略图路径</param>
		/// <param name="width">缩略图宽度</param>
		/// <param name="height">缩略图高度</param>
		/// <param name="mode">生成缩略图的方式:HW指定高宽缩放(可能变形);W指定宽，高按比例 H指定高，宽按比例 Cut指定高宽裁减(不变形)</param>　　
		/// <param name="mode">要缩略图保存的格式(gif,jpg,bmp,png) 为空或未知类型都视为jpg</param>　　
		public static bool MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode, string imageType)
		{
			bool result = true;

			Image originalImage = Image.FromFile(originalImagePath);
			int towidth = width;
			int toheight = height;
			int x = 0;
			int y = 0;
			int ow = originalImage.Width;
			int oh = originalImage.Height;
			switch (mode)
			{
				case "HW"://指定高宽缩放（可能变形）　　　　　　　　
					break;

				case "W"://指定宽，高按比例　　　　　　　　　　
					toheight = originalImage.Height * width / originalImage.Width;
					break;

				case "H"://指定高，宽按比例
					towidth = originalImage.Width * height / originalImage.Height;
					break;

				case "Cut"://指定高宽裁减（不变形）　　　　　　　　
					if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
					{
						oh = originalImage.Height;
						ow = originalImage.Height * towidth / toheight;
						y = 0;
						x = (originalImage.Width - ow) / 2;
					}
					else
					{
						ow = originalImage.Width;
						oh = originalImage.Width * height / towidth;
						x = 0;
						y = (originalImage.Height - oh) / 2;
					}
					break;

				default:
					break;
			}
			//新建一个bmp图片
			Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
			//新建一个画板
			Graphics g = System.Drawing.Graphics.FromImage(bitmap);
			//设置高质量插值法
			g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
			//设置高质量,低速度呈现平滑程度
			g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
			//清空画布并以透明背景色填充
			g.Clear(Color.Transparent);
			//在指定位置并且按指定大小绘制原图片的指定部分
			g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
			   new Rectangle(x, y, ow, oh),
			   GraphicsUnit.Pixel);
			try
			{
				// 以jpg格式保存缩略图
				switch (imageType.ToLower())
				{
					case ".gif":
						bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Gif);
						break;

					case ".jpg":
					case ".jpeg":
						bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
						break;

					case ".bmp":
						bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Bmp);
						break;

					case ".png":
						bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Png);
						break;

					default:
						bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
						break;
				}
			}
			catch (System.Exception e)
			{
				throw e;
			}
			finally
			{
				originalImage.Dispose();
				bitmap.Dispose();
				g.Dispose();
			}

			return result;
		}

		public static Image MakeThumbnail(Bitmap originalImage, int width)
		{
			int towidth = width;
			int toheight = 0;
			int x = 0;
			int y = 0;
			int ow = originalImage.Width;
			int oh = originalImage.Height;
			if (ow <= width)
			{
				return originalImage;
			}
			toheight = (int)(width * 0.64);// oh * width / ow;

			//新建一个bmp图片
			Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
			//新建一个画板
			Graphics g = System.Drawing.Graphics.FromImage(bitmap);
			//设置高质量插值法
			g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
			//设置高质量,低速度呈现平滑程度
			g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
			//清空画布并以透明背景色填充
			g.Clear(Color.Transparent);
			//在指定位置并且按指定大小绘制原图片的指定部分
			g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
			   new Rectangle(x, y, ow, oh),
			   GraphicsUnit.Pixel);
			try
			{
				// 以jpg格式保存缩略图
				//switch (imageType.ToLower())
				//{
				//    case ".gif":
				//        bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Gif);
				//        break;
				//    case ".jpg":
				//    case ".jpeg":
				//        bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
				//        break;
				//    case ".bmp":
				//        bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Bmp);
				//        break;
				//    case ".png":
				//        bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Png);
				//        break;
				//    default:
				//        bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
				//        break;
				//}
				return bitmap;
			}
			catch (System.Exception e)
			{
				throw e;
			}
			finally
			{
				originalImage.Dispose();
				bitmap.Dispose();
				g.Dispose();
			}

			return null;
		}

		/// <summary>
		/// 生成 扫描条码 与扫描指示 图
		/// </summary>
		/// <param name="QrCodefullfilename">条码路径</param>
		/// <param name="rightfullfilename">指示图路径</param>
		public static void JoinQrCodeImage(string QrCodefullfilename, string rightfullfilename)
		{
			List<Image> imageList = new List<Image>();
			Image qrCodeImage = Image.FromFile(QrCodefullfilename);
			imageList.Add(qrCodeImage);
			Image rightImage = Image.FromFile(rightfullfilename);
			imageList.Add(rightImage);
			Image newImage = JoinImage(imageList, JoinMode.Horizontal, 80);
			string saveCodefullfilename = QrCodefullfilename.Replace(".png", ".jpg");
			newImage.Save(saveCodefullfilename, System.Drawing.Imaging.ImageFormat.Jpeg);
		}

		/// <summary>
		/// 拼接图片
		/// </summary>
		/// <param name="imageList"></param>
		/// <param name="jm"></param>
		/// <returns></returns>
		private static Image JoinImage(List<Image> imageList, JoinMode jm, int zoom)
		{
			//图片列表
			if (imageList.Count <= 0)
				return null;
			if (jm == JoinMode.Horizontal)
			{
				//横向拼接
				int width = 0;
				//计算总长度
				foreach (Image i in imageList)
				{
					width += i.Width;
				}
				//高度不变
				int height = imageList.Max(x => x.Height);

				width = width * zoom / 100;
				height = height * zoom / 100;
				//构造最终的图片白板
				Bitmap tableChartImage = new Bitmap(width, height);
				Graphics graph = Graphics.FromImage(tableChartImage);
				//初始化这个大图
				graph.DrawImage(tableChartImage, width, height);
				//初始化当前宽
				int left = 0;
				foreach (Image i in imageList)
				{
					int curWidth = i.Width * zoom / 100;
					int curHeight = i.Height * zoom / 100;
					//拼图
					graph.DrawImage(i, left, 0, curWidth, curHeight);
					//拼接改图后，当前宽度
					left += curWidth;
				}
				return tableChartImage;
			}
			else if (jm == JoinMode.Vertical)
			{
				//纵向拼接
				int height = 0;
				//计算总长度
				foreach (Image i in imageList)
				{
					height += i.Height;
				}
				//宽度不变
				int width = imageList.Max(x => x.Width);
				//构造最终的图片白板
				Bitmap tableChartImage = new Bitmap(width, height);
				Graphics graph = Graphics.FromImage(tableChartImage);
				//初始化这个大图
				graph.DrawImage(tableChartImage, width, height);
				//初始化当前宽
				int currentHeight = 0;
				foreach (Image i in imageList)
				{
					//拼图
					graph.DrawImage(i, 0, currentHeight);
					//拼接改图后，当前宽度
					currentHeight += i.Height;
				}
				return tableChartImage;
			}
			else
			{
				return null;
			}
		}
	}
}