using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
using System.Text.RegularExpressions;
using System.Drawing;
using System.Drawing.Imaging;
using System.Collections;
using System.ComponentModel;
namespace MSCL
{
/// <summary>
/// C#圖片上傳,加水印,自動生成縮略圖的摘要說明
/// </summary>
public class XImage
{
public Color tBackground;
public Color tBorder;
public Color tShadow;
public int tQuality;
public string markPosition;
/// <summary>
/// 圖片參數預定義
/// </summary>
static Hashtable htmimes = new Hashtable();
internal readonly string AllowExt = ".jpe|.jpeg|.jpg|.png|.tif|.tiff|.bmp|.gif";
public XImage()
{
tBackground = Color.Transparent;
tBorder = Color.Transparent;
tShadow = Color.Transparent;
tQuality = 100;
markPosition = "左下角";
#region 圖片類型預定義
htmimes[".jpe"] = "image/jpeg";
htmimes[".jpeg"] = "image/jpeg";
htmimes[".jpg"] = "image/jpeg";
htmimes[".png"] = "image/png";
htmimes[".tif"] = "image/tiff";
htmimes[".tiff"] = "image/tiff";
htmimes[".bmp"] = "image/bmp";
htmimes[".gif"] = "image/gif";
#endregion
}
#region 下載指定URL圖片並保存
/// <summary>
/// 下載指定URL的文件並保存到指定目錄
/// </summary>
/// <param name="strUrl"></param>
public void DownloadImage(string strUrl, string file)
{
System.Net.WebClient wc = new System.Net.WebClient();
wc.DownloadFile(strUrl, file);
}
#endregion
#region C#自動生成縮略圖
/// <summary>
/// 按給定名字確定顏色
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public Color ToColor(string name)
{
if (name == "白色") return Color.White;
if (name == "紅色") return Color.Red;
if (name == "藍色") return Color.Blue;
if (name == "綠色") return Color.Green;
if (name == "黑色") return Color.Black;
if (name == "灰色") return Color.DarkGray;
if (name == "黃色") return Color.Yellow;
if (name == "紫色") return Color.Cyan;
if (name == "無色") return Color.Transparent;
return Color.Transparent;
}
/// <summary>
/// 按名字設置各種顏色，可以自行擴充:)
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public int ToQuality(string name)
{
return Int32.Parse(name.Replace("%", ""));
}
/// <summary>
/// 獲取圖像編碼解碼器的所有相關信息
/// </summary>
/// <param name="mimeType">包含編碼解碼器的多用途網際郵件擴充協議 (MIME) 類型的字符串</param>
/// <returns>返回圖像編碼解碼器的所有相關信息</returns>
private static ImageCodecInfo GetCodecInfo(string mimeType)
{
ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders();
foreach (ImageCodecInfo ici in CodecInfo)
{
if (ici.MimeType == mimeType) return ici;
}
return null;
}
/// <summary>
/// 檢測擴展名的有效性
/// </summary>
/// <param name="sExt">文件名擴展名</param>
/// <returns>如果擴展名有效,返回true,否則返回false.</returns>
private bool CheckValidExt(string sExt)
{
bool flag = false;
string[] aExt = AllowExt.Split('|');
foreach (string filetype in aExt)
{
if (filetype.ToLower() == sExt)
{
flag = true;
break;
}
}
return flag;
}
/// <summary>
/// 保存圖片
/// </summary>
/// <param name="image">Image 對象</param>
/// <param name="savePath">保存路徑</param>
/// <param name="ici">指定格式的編解碼參數</param>
private void SaveImage(System.Drawing.Image image, string savePath, ImageCodecInfo ici)
{
//設置 原圖片 對象的 EncoderParameters 對象
EncoderParameters parameters = new EncoderParameters(1);
parameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, ((long)tQuality));
image.Save(savePath, ici, parameters);
parameters.Dispose();
}
/// <summary>
/// 生成縮略圖
/// </summary>
/// <param name="sourceImagePath">原圖片路徑(相對路徑)</param>
/// <param name="thumbnailImagePath">生成的縮略圖路徑,如果為空則保存為原圖片路徑(相對路徑)</param>
/// <param name="thumbnailImageWidth">縮略圖的寬度（高度與按源圖片比例自動生成）</param>
public void ToThumbnail(string sourceImagePath, string thumbnailImagePath, int thumbnailImageWidth, int thumbnailImageHeight)
{
// 1.先檢查圖片格式等信息
string ThumbnailImagePath = thumbnailImagePath;
string SourceImagePath = sourceImagePath;
string sExt = SourceImagePath.Substring(SourceImagePath.LastIndexOf(".")).ToLower();
if (SourceImagePath.ToString() == System.String.Empty)
{
throw new NullReferenceException("SourceImagePath is null!");
}
if (!CheckValidExt(sExt))
{
throw new ArgumentException("原圖片文件格式不正確,支持的格式有[ " + AllowExt + " ]", "SourceImagePath");
}
// 從原圖片創建 Image 對象
System.Drawing.Image image = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(SourceImagePath));
// 2.計算圖片的位置、尺寸等信息
int tWidth, tHeight, tLeft, tTop;
double fScale = (double)thumbnailImageHeight / (double)thumbnailImageWidth; // 高度寬度比
if (((double)image.Width * fScale) > (double)image.Height) // 如果原圖比較寬
{
tWidth = thumbnailImageWidth;
tHeight = (int)((double)image.Height * (double)tWidth / (double)image.Width);
tLeft = 0;
tTop = (thumbnailImageHeight - tHeight) / 2;
}
else
{
tHeight = thumbnailImageHeight;
tWidth = (int)((double)image.Width * (double)tHeight / (double)image.Height);
tLeft = (thumbnailImageWidth - tWidth) / 2;
tTop = 0;
}
if (tLeft < 0) tLeft = 0;
if (tTop < 0) tTop = 0;
if (tBorder != Color.Transparent)
{
tWidth -= 2;
tHeight -= 2;
tLeft++;
tTop++;
}
if (tShadow != Color.Transparent)
{
tWidth -= 1;
tHeight -= 1;
}
//用指定的大小和格式初始化 Bitmap 類的新實例
//Bitmap bitmap = new Bitmap(ThumbnailImageWidth, num, PixelFormat.Format32bppArgb);
Bitmap bitmap = new Bitmap(thumbnailImageWidth, thumbnailImageHeight, PixelFormat.Format32bppArgb);
//從指定的 Image 對象創建新 Graphics 對象
Graphics graphics = Graphics.FromImage(bitmap);
//清除整個繪圖面並以透明背景色填充
if (tBackground != Color.Transparent)
{
graphics.Clear(tBackground);
}
else
{
graphics.Clear(Color.Transparent);
}
// 添加陰影
if (tShadow != Color.Transparent)
{
Pen shPen = new Pen(tShadow);
graphics.DrawLine(shPen, new Point(1, thumbnailImageHeight - 1), new Point(thumbnailImageWidth - 1, thumbnailImageHeight - 1));
graphics.DrawLine(shPen, new Point(thumbnailImageWidth - 1, 1), new Point(thumbnailImageWidth - 1, thumbnailImageHeight - 1));
}
// 添加邊框
if (tBorder != Color.Transparent)
{
Pen bdPen = new Pen(tBorder);
if (tShadow != Color.Transparent)
{
graphics.DrawRectangle(bdPen, new Rectangle(0, 0, thumbnailImageWidth - 2, thumbnailImageHeight - 2));
}
else
{
graphics.DrawRectangle(bdPen, new Rectangle(0, 0, thumbnailImageWidth - 1, thumbnailImageHeight - 1));
}
}
//在指定位置並且按指定大小繪制 原圖片 對象
graphics.DrawImage(image, new Rectangle(tLeft, tTop, tWidth, tHeight));
image.Dispose();
try
{
//將此 原圖片 以指定格式並用指定的編解碼參數保存到指定文件
string savepath = (ThumbnailImagePath == null ? SourceImagePath : ThumbnailImagePath);
SaveImage(bitmap, HttpContext.Current.Server.MapPath(savepath), GetCodecInfo((string)htmimes[sExt]));
}
catch (System.Exception e)
{
throw e;
}
finally
{
bitmap.Dispose();
graphics.Dispose();
}
}
#endregion
#region C#給圖片添加水印
public void Mark(string sourceImagePath, string markString)
{
// 1.先檢查圖片格式等信息
string markImagePath = sourceImagePath;
string SourceImagePath = sourceImagePath;
string sExt = SourceImagePath.Substring(SourceImagePath.LastIndexOf(".")).ToLower();
if (SourceImagePath.ToString() == System.String.Empty)
{
throw new NullReferenceException("SourceImagePath is null!");
}
if (!CheckValidExt(sExt))
{
throw new ArgumentException("原圖片文件格式不正確,支持的格式有[ " + AllowExt + " ]", "SourceImagePath");
}
// 從原圖片創建 Image 對象
System.Drawing.Image image = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(SourceImagePath));
//用指定的大小和格式初始化 Bitmap 類的新實例
Bitmap bitmap = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppArgb);
//從指定的 Image 對象創建新 Graphics 對象
Graphics graphics = Graphics.FromImage(bitmap);
//在指定位置並且按指定大小繪制 原圖片 對象
graphics.DrawImage(image, new Rectangle(0, 0, image.Width, image.Height));
#region 繪制水印
// 設置水印字體
int fHeight = image.Height / 5;
if (fHeight > 16) fHeight = 16;
Font drawFont = new Font("Arial", fHeight);
// 設置水印文字位置，默認為左下角
float x = 4;
float y = image.Height - drawFont.Height - 4;
if (markPosition == "左上角")
{
y = 4;
}
if (markPosition == "右上角")
{
x = image.Width - markString.Length * fHeight / 2 - fHeight;
y = 4;
}
if (markPosition == "右下角")
{
x = image.Width - markString.Length * fHeight / 2 - fHeight;
}
if (markPosition == "圖片中間")
{
x = image.Width / 2 - markString.Length * fHeight / 2;
y = image.Height / 2 - fHeight / 2;
}
StringFormat drawFormat = new StringFormat();
drawFormat.FormatFlags = StringFormatFlags.NoWrap;
// 設置水印文字顏色，先繪制一個黑色字作為陰影，再繪制白色字，這樣比較顯眼；
SolidBrush drawBrush = new SolidBrush(Color.Black);
graphics.DrawString(markString, drawFont, drawBrush, x, y, drawFormat);
drawBrush.Color = Color.White;
graphics.DrawString(markString, drawFont, drawBrush, x - 1, y - 1, drawFormat);
#endregion
image.Dispose();
try
{
//將此 原圖片 以指定格式並用指定的編解碼參數保存到指定文件
string savepath = SourceImagePath;
SaveImage(bitmap, HttpContext.Current.Server.MapPath(savepath), GetCodecInfo((string)htmimes[sExt]));
}
catch (System.Exception e)
{
throw e;
}
finally
{
bitmap.Dispose();
graphics.Dispose();
}
}
#endregion
}
}
