299 lines
11 KiB
C#
299 lines
11 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Text;
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using System.Threading.Tasks;
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namespace Work.BLL.Tools
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{
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public class Base64ChangeImgUrl
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{
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/// <summary>
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/// 将Base64字符串转换为图片
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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public Bitmap ToImage(string imgBase64)
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{
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imgBase64 = imgBase64.Substring("data:image/jpeg;base64,".Length);
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byte[] bytes = Convert.FromBase64String(imgBase64);
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MemoryStream ms = new MemoryStream(bytes);
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Image mImage = Image.FromStream(ms);
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Bitmap bmpt = new Bitmap(ms);
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return bmpt;
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}
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/// <summary>
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/// 图片转Base64
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/// </summary>
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/// <param name="ImageFileName">图片的完整路径</param>
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/// <returns></returns>
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public static string ImgToBase64(Bitmap bmp)
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{
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try
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{
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MemoryStream ms = new MemoryStream();
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bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
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byte[] arr = new byte[ms.Length];
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ms.Position = 0;
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ms.Read(arr, 0, (int)ms.Length);
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ms.Close();
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return Convert.ToBase64String(arr);
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}
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catch (Exception)
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{
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return null;
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}
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}
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public string CutZoom(string Base64pic)
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{
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byte[] arr2 = Convert.FromBase64String(Base64pic);
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Bitmap bmp3 = null;
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using (MemoryStream ms2 = new MemoryStream(arr2))
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{
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Bitmap bmp2 = new System.Drawing.Bitmap(ms2);
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bmp3 = GetThumbnail(bmp2, 130, 270);
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}
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return ImgToBase64(bmp3);
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}
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/// <summary>
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/// 图片转为二进制
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/// </summary>
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/// <param name="Bitmap"></param>
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/// <returns></returns>
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public byte[] GetPictureData(Bitmap Bitmap)
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{
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MemoryStream ms = null;
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try
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{
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ms = new MemoryStream();
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Bitmap.Save(ms, Bitmap.RawFormat);
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byte[] byteImage = new Byte[ms.Length];
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byteImage = ms.ToArray();
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return byteImage;
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}
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catch (ArgumentNullException ex)
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{
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throw ex;
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}
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finally
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{
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ms.Close();
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}
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}
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public byte[] Base64ChangeBuffer(String imgBase64)
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{
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try
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{
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if (!string.IsNullOrEmpty(imgBase64))
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{
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return GetPictureData(ToImage(imgBase64));
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}
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return null;
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}
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catch
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{
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return null;
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}
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}
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public static Bitmap GetThumbnail(Bitmap b, int destHeight, int destWidth)
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{
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System.Drawing.Image imgSource = b;
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System.Drawing.Imaging.ImageFormat thisFormat = imgSource.RawFormat;
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int sW = 0, sH = 0;
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// 按比例缩放
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int sWidth = imgSource.Width;
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int sHeight = imgSource.Height;
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if (sHeight > destHeight || sWidth > destWidth)
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{
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if ((sWidth * destHeight) > (sHeight * destWidth))
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{
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sW = destWidth;
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sH = (destWidth * sHeight) / sWidth;
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}
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else
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{
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sH = destHeight;
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sW = (sWidth * destHeight) / sHeight;
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}
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}
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else
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{
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sW = sWidth;
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sH = sHeight;
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}
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Bitmap outBmp = new Bitmap(destWidth, destHeight);
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Graphics g = Graphics.FromImage(outBmp);
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g.Clear(Color.Transparent);
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// 设置画布的描绘质量
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g.CompositingQuality = CompositingQuality.HighQuality;
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g.SmoothingMode = SmoothingMode.HighQuality;
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g.InterpolationMode = InterpolationMode.HighQualityBicubic;
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g.DrawImage(imgSource, new Rectangle((destWidth - sW) / 2, (destHeight - sH) / 2, sW, sH), 0, 0, imgSource.Width, imgSource.Height, GraphicsUnit.Pixel);
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g.Dispose();
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// 以下代码为保存图片时，设置压缩质量
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EncoderParameters encoderParams = new EncoderParameters();
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long[] quality = new long[1];
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quality[0] = 100;
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EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
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encoderParams.Param[0] = encoderParam;
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imgSource.Dispose();
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return outBmp;
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}
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public int CalculateNick(Bitmap bitmap, int v)
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{
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int iNickX = 0;
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int iDis = 5; //差异值
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List<int> lstiNickX = new List<int>();
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for (int y = 0; y < bitmap.Height; y++)
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{
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for (int x = 0; x < bitmap.Width - v; x++)
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{
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Color color1 = bitmap.GetPixel(x, y);
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Color color2 = bitmap.GetPixel(x + 1, y);
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int icolor1 = GetRGBFromColor(color1);
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int icolor2 = GetRGBFromColor(color2);
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double dDistance = GetDistance(color2, color1);
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if (dDistance > iDis && icolor2 < icolor1)
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{
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for (int i = 0; i < v + v / 2; i++)
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{
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iNickX = x + i;
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if (iNickX >= bitmap.Width - 1)
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{
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continue;
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}
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Color colorNickPre = bitmap.GetPixel(iNickX, y);
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Color colorNickAft = bitmap.GetPixel(iNickX + 1, y);
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int icolorNickPre = GetRGBFromColor(colorNickPre);
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int icolorNickAft = GetRGBFromColor(colorNickAft);
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double dNickDistance = GetDistance(colorNickAft, colorNickPre);
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if (dNickDistance > dDistance && icolorNickAft > icolorNickPre)
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{
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int iGap = Math.Abs(iNickX - x - v);
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if (iGap <= 2)
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{
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lstiNickX.Add(x);
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}
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break;
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}
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}
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}
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}
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}
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if (lstiNickX.Count > 0)
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{
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iNickX = GetRight(lstiNickX);
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//label1.Text = iNickX.ToString();
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}
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return iNickX;
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}
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/// <summary>
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/// 滑块的宽度
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/// </summary>
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/// <param name="bitmap"></param>
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/// <param name="v"></param>
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/// <returns></returns>
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public int CalculateNickNew(Bitmap bitmap, int v = 39)
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{
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int iNickX = 0;
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decimal idif = 0.50m; // 差异比例
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List<int> lstiNickX = new List<int>();
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for (int y = 0; y < bitmap.Height; y++)
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{
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for (int x = 0; x < bitmap.Width - v - 1; x++)
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{
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Color color1 = bitmap.GetPixel(x, y);
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Color color2 = bitmap.GetPixel(x + 1, y);
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int icolor1 = color1.R + color1.G + color1.B;
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int icolor2 = color2.R + color2.G + color2.B;
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if (color2.R < color1.R * (1 - idif) && color2.G < color1.G * (1 - idif) && color2.G < color1.G * (1 - idif))
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{
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for (int i = 1; i < v + v / 2; i++)
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{
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iNickX = x + i;
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if (iNickX >= bitmap.Width - 1)
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{
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continue;
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}
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Color color3 = bitmap.GetPixel(iNickX, y);
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Color color4 = bitmap.GetPixel(iNickX + 1, y);
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int icolor3 = GetRGBFromColor(color3);
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int icolor4 = GetRGBFromColor(color4);
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if (color3.R < color4.R * (1 - idif) && color3.G < color4.G * (1 - idif) && color3.G < color4.G * (1 - idif))
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{
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int iGap = Math.Abs(iNickX - x - v);
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if (iGap <= 2)
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{
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lstiNickX.Add(x);
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break;
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}
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}
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}
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}
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}
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}
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if (lstiNickX.Count > 0)
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{
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iNickX = GetRight(lstiNickX);
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//label1.Text = iNickX.ToString();
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}
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return iNickX + 1;
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}
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public int GetRGBFromColor(Color color)
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{
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return (int)(((int)color.B << 16) | (ushort)(((ushort)color.G << 8) | color.R));
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byte r = color.R;
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byte g = color.G;
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byte b = color.B;
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//转化为32bit RGB值:
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int rgb = r + g * 256 + b * 256 * 256;
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return rgb;
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}
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private double GetDistance(Color color1, Color color2)
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{
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double y1, u1, v1, y2, u2, v2;
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y1 = 0.299 * color1.R + 0.587 * color1.G + 0.114 * color1.B;
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u1 = -0.14713 * color1.R - 0.28886 * color1.G + 0.436 * color1.B;
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v1 = 0.615 * color1.R - 0.51498 * color1.G - 0.10001 * color1.B;
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y2 = 0.299 * color2.R + 0.587 * color2.G + 0.114 * color2.B;
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u2 = -0.14713 * color2.R - 0.28886 * color2.G + 0.436 * color2.B;
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v2 = 0.615 * color2.R - 0.51498 * color2.G - 0.10001 * color2.B;
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return Math.Sqrt((y1 - y2) * (y1 - y2) + (u1 - u2) * (u1 - u2) + (v1 - v2) * (v1 - v2));
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}
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private int GetRight(List<int> lstiNickX)
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{
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var res = from n in lstiNickX
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group n by n into g
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orderby g.Count() descending
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select g;
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var gr = res.First();
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return gr.Key;
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}
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}
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}
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