SANAS/Base/CommTool/DrawRulerHelper.cs

using SmartCoalApplication.Base.Enum;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace SmartCoalApplication.Base.CommTool
{
    /// <summary>
    /// 绘制标尺
    /// </summary>
    public class DrawRulerHelper
    {
        /// <summary>
        /// 缩放图像
        /// </summary>
        /// <param name="originalImage"></param>
        /// <param name="width"></param>
        /// <param name="height"></param>
        /// <param name="mode"></param>
        /// <returns></returns>
        public static Image ResizeImage(Image originalImage, int width, int height, ThumbnailMode mode)
        {
            int towidth = width;
            int toheight = height;

            int x = 0;
            int y = 0;
            int initWidth = originalImage.Width;
            int initHeight = originalImage.Height;


            switch (mode)
            {
                case ThumbnailMode.UsrHeightWidth: //指定高宽缩放(可能变形)
                    break;
                case ThumbnailMode.UsrHeightWidthBound: //指定高宽缩放(可能变形)(过小则不变)
                    if (originalImage.Width <= width && originalImage.Height <= height)
                    {
                        return originalImage;
                    }
                    if (originalImage.Width < width)
                    {
                        towidth = originalImage.Width;
                    }
                    if (originalImage.Height < height)
                    {
                        toheight = originalImage.Height;
                    }
                    break;
                case ThumbnailMode.UsrWidth: //指定宽，高按比例
                    toheight = originalImage.Height * width / originalImage.Width;
                    break;
                case ThumbnailMode.UsrWidthBound: //指定宽(过小则不变)，高按比例
                    if (originalImage.Width <= width)
                    {
                        return originalImage;
                    }
                    else
                    {
                        toheight = originalImage.Height * width / originalImage.Width;
                    }
                    break;
                case ThumbnailMode.UsrHeight: //指定高，宽按比例
                    towidth = originalImage.Width * height / originalImage.Height;
                    break;
                case ThumbnailMode.UsrHeightBound: //指定高(过小则不变)，宽按比例
                    if (originalImage.Height <= height)
                    {
                        return originalImage;
                    }
                    else
                    {
                        towidth = originalImage.Width * height / originalImage.Height;
                    }
                    break;
                case ThumbnailMode.Cut: //指定高宽裁减(不变形)
                    //计算宽高比
                    double srcScale = (double)originalImage.Width / (double)originalImage.Height;
                    double destScale = (double)towidth / (double)toheight;
                    //宽高比相同
                    if (srcScale - destScale >= 0 && srcScale - destScale <= 0.001)
                    {
                        x = 0;
                        y = 0;
                        initWidth = originalImage.Width;
                        initHeight = originalImage.Height;
                    }
                    //源宽高比大于目标宽高比
                    //(源的宽比目标的宽大)
                    else if (srcScale > destScale)
                    {
                        initWidth = originalImage.Height * towidth / toheight;
                        initHeight = originalImage.Height;
                        x = (originalImage.Width - initWidth) / 2;
                        y = 0;
                    }
                    //源宽高比小于目标宽高小，源的高度大于目标的高度
                    else
                    {
                        initWidth = originalImage.Width;
                        initHeight = originalImage.Width * height / towidth;
                        x = 0;
                        y = (originalImage.Height - initHeight) / 2;
                    }
                    break;
                default:
                    break;
            }
            Image bitmap = new Bitmap(towidth, toheight);
            //新建一个画板
            using (Graphics g = Graphics.FromImage(bitmap))
            {
                //设置高质量插值法
                g.CompositingQuality = CompositingQuality.HighQuality;
                //设置高质量,低速段呈现的平滑程度
                g.SmoothingMode = SmoothingMode.HighQuality;

                //在指定的位置上,并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, initWidth, initHeight), GraphicsUnit.Pixel);
            }
            return bitmap;
        }

        /// <summary>
        /// 深拷贝,反射
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static T DeepCopyByReflect<T>(T obj)
        {
            //如果是字符串或值类型则直接返回
            if (obj == null || obj is string || obj.GetType().IsValueType) return obj;
            object retval = Activator.CreateInstance(obj.GetType());
            FieldInfo[] fields = obj.GetType().GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);
            foreach (FieldInfo field in fields)
            {
                try { field.SetValue(retval, DeepCopyByReflect(field.GetValue(obj))); }
                catch { }
            }
            return (T)retval;
        }

        public static List<T> DeepCopyListByReflect<T>(List<T> objs)
        {
            List<T> list = new List<T>();
            if (objs != null && objs.Count > 0)
            {
                foreach (T t in objs)
                {
                    list.Add(DeepCopyByReflect(t));
                }
            }
            return list;
        }

        /// <summary>
        /// base64转bitmap
        /// </summary>
        /// <param name="strbase64"></param>
        /// <returns></returns>
        public static Bitmap Base64StringToImage(string strbase64)
        {
            try
            {
                byte[] arr = Convert.FromBase64String(strbase64);
                MemoryStream ms = new MemoryStream(arr);
                Bitmap bmp = new Bitmap(ms);
                ms.Close();
                return bmp;
            }
            catch (Exception)
            {
                return null;
            }
        }

        /// <summary>
        /// bitmap转base64
        /// </summary>
        /// <param name="bmp"></param>
        /// <returns></returns>
        public static string ImgToBase64String(Bitmap source)
        {
            OpenCvSharp.Mat mat = OpenCvSharp.Extensions.BitmapConverter.ToMat(source);
            Bitmap bitmap = OpenCvSharp.Extensions.BitmapConverter.ToBitmap(mat);
            string base64 = "";
            using (MemoryStream ms = new MemoryStream())
            {
                bitmap.Save(ms, ImageFormat.Jpeg);
                base64 = Convert.ToBase64String(ms.ToArray());
                ms.Close();
                bitmap.Dispose();
            }
            return base64;
        }

    }
}