圖形類（一）

//*************************************************************************************************
//完成日期： 2004-11-5
//作者：     何利民
//程序功能： 圖片功能類
//*************************************************************************************************
using System;
using System.Drawing;
using System.Drawing.Text;
using System.Drawing.Imaging;

namespace ImagesSpaceName
{

    定義結構對象#region  定義結構對象

    /**//// <summary>
    /// 錯誤信息
    /// </summary>
    public struct ErrorStruct
    {
        public string source;                        //來源
        public string sourcename;                    //來源名稱
        public string content;                        //錯誤內容
        public string text;                            //錯誤信息
    }

    #endregion

    定義對齊枚舉對象#region 定義對齊枚舉對象

    /**//// <summary>
    /// 水平對齊
    /// </summary>
    public enum Align
    {
        left = 1,
        center = 2,
        right = 3
    }

    /**//// <summary>
    /// 垂直對齊
    /// </summary>
    public enum Valign
    {
        top = 1,
        middle = 2,
        bottom =3
    }

    /**//// <summary>
    /// 標題對齊
    /// </summary>
    public enum WaterTitle
    {
        top,
        bottom,
        left,
        right,
        none
    }

    #endregion

    public class ImagesClass
    {
        定義變量#region 定義變量

        protected static string[] ERRORSOURCE = new string[2];    //錯誤來源
        protected static string[] ERRORINFO = new string[10];    //錯誤信息
        
        public ErrorStruct ErrorRecord;                            //記錄錯誤信息

        #endregion
        
        初使化構造函數 ImagesClass()#region 初使化構造函數 ImagesClass()
        public ImagesClass()
        {
            ERRORSOURCE[0] = "來源屬性";
            ERRORSOURCE[1] = "來源方法";
            ERRORINFO[0] = "值應為數字";
            ERRORINFO[1] = "顏色值應為#FFFFFF的形式";
            ERRORINFO[2] = "透明度的值應在0-100之間";
            ERRORINFO[3] = "看缺少繪圖區";
        }
        #endregion

        保存圖片#region 保存圖片

        /**//// <param name="image">要保存的圖片緩沖塊</param>
        /// <param name="imgFormat">圖片格式</param>
        public void SaveImage(Image image, ImageFormat imgFormat)
        {
            try
            {
                System.Web.HttpContext content = System.Web.HttpContext.Current;
                image.Save(content.Response.OutputStream,imgFormat);
            }
            catch
            {
                throw new Exception("請引入System.Web命名空間");
            }
        }

        /**//// <param name="image">要保存的圖片緩沖塊</param>
        /// <param name="imgFormat">圖片格式</param>
        /// <param name="fileName">要保存的圖片文件名</param>
        public void SaveImage(Image image, ImageFormat imgFormat, string fileName)
        {
            try
            {
                image.Save(fileName,imgFormat);
            }
            catch
            {
                throw new Exception("目標文件已經存在!");
            }
        }

        #endregion

        設定圖片的透明度#region 設定圖片的透明度

        /**//// <summary>
        /// 設定圖片的透明度
        /// </summary>
        /// <param name="image">要設定透明度的圖片</param>
        /// <param name="bgColor">底色</param>
        /// <param name="alpha">透明度(0-255)</param>
        public System.Drawing.Bitmap ImageAlpha(System.Drawing.Bitmap image, Color bgColor, int alpha)
        {
            int iH = image.Height;
            int iW = image.Width;
            System.Drawing.Bitmap img = new Bitmap(iW,iH);
            System.Drawing.Graphics grap = Graphics.FromImage(img);
            grap.Clear(bgColor);
            for(int y=0; y<iH; y++)
            {
                for(int x=0; x<iW; x++)
                {
                    int r = image.GetPixel(x,y).R;
                    int g = image.GetPixel(x,y).G;
                    int b = image.GetPixel(x,y).B;
                    grap.DrawEllipse(new Pen(new SolidBrush(Color.FromArgb(alpha,r,g,b))),x,y,1,1);
                }
            }
            return img;
        }

        #endregion

        跟踞數字獲得顏色#region 跟踞數字獲得顏色

        public Color GetColor(int itemIndex) 
        { 
            Color objColor; 
            if (itemIndex == 0) 
            { 
                objColor = Color.Blue; 
            } 
            else if (itemIndex == 1) 
            { 
                objColor = Color.Red; 
            } 
            else if (itemIndex == 2) 
            { 
                objColor = Color.Yellow; 
            } 
            else if (itemIndex == 3) 
            { 
                objColor = Color.Purple; 
            } 
            else if (itemIndex == 4) 
            { 
                objColor = Color.Orange; 
            } 
            else if (itemIndex == 5) 
            { 
                objColor = Color.Brown; 
            } 
            else if (itemIndex == 6) 
            { 
                objColor = Color.Gray; 
            } 
            else if (itemIndex == 7) 
            { 
                objColor = Color.Maroon; 
            } 
            else if (itemIndex == 8) 
            { 
                objColor = Color.Maroon; 
            } 
            else if (itemIndex==9)
            {
                objColor = Color.SlateBlue;
            }
            else if (itemIndex==10)
            {
                objColor = Color.Gainsboro;
            }
            else if (itemIndex==11)
            {
                objColor = Color.Khaki;
            }
            else if (itemIndex==12)
            {
                objColor = Color.LightGoldenrodYellow;
            }
            else if (itemIndex==13)
            {
                objColor = Color.MidnightBlue;
            }
            else if (itemIndex==14)
            {
                objColor = Color.AntiqueWhite;
            }
            else if (itemIndex==15)
            {
                objColor = Color.Wheat;
            }
            else
            { 
                objColor = Color.Blue; 
            } 
            return objColor; 
        } 


        #endregion

        設置錯誤信息 void SetErrorInfo(string,string,string,string)#region 設置錯誤信息 void SetErrorInfo(string,string,string,string)
        /**//// <summary>
        /// 設置錯誤信息
        /// </summary>
        /// <param name="s">來源[1:設置屬性]</param>
        /// <param name="n">來源名稱</param>
        /// <param name="c">錯誤內容</param>
        /// <param name="t">錯誤信息</param>
        protected void SetErrorInfo(string s, string n, string c, string t)
        {
            
            this.ErrorRecord.source = s;
            this.ErrorRecord.sourcename = n;
            this.ErrorRecord.content = c;
            this.ErrorRecord.text = t;
        }
        #endregion

        刪除指定的文件 void DelFile(string)#region 刪除指定的文件 void DelFile(string)
        protected void DelFile(string filename)
        {
            System.IO.File.Delete(filename);
        }
        #endregion

        判斷文件是否存在 bool ExistsFile(string)#region 判斷文件是否存在 bool ExistsFile(string)
        protected bool ExistsFile(string filename)
        {
            if(System.IO.File.Exists(filename))
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        #endregion

        獲得文件的擴展名的小寫形式 string GetFile_Ext(string)#region  獲得文件的擴展名的小寫形式 string GetFile_Ext(string)
        protected string GetFile_Ext(string filename)
        {
            return filename.Substring(filename.LastIndexOf(".")+1).ToLower();
        }
        #endregion

        獲得文件格式 ImageFormat GetFileFromat(string)#region 獲得文件格式 ImageFormat GetFileFromat(string)
        /**//// <param name="fileExt">文件擴展名</param>
        protected ImageFormat GetFileFromat(string fileExt)
        {
            if(fileExt.ToLower()=="jpg")
                return ImageFormat.Jpeg;
            else if(fileExt.ToLower()=="gif")
                return ImageFormat.Gif;
            else
                return ImageFormat.Jpeg;
        }

        #endregion
    }
}