生成水印(繼承自圖片類)

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

namespace ImagesSpaceName
{


    public class WaterImage : ImagesClass
    {

        定義類變量#region  定義類變量

        private string _waterName = "冷風.net制作";                //水印文字
        private Image _waterImage = null;                        //圖片
        private string _fileName = null;                        //水印圖片要保存的文件名
        private Align _align = ImagesSpaceName.Align.right;        //水印圖片的水平對齊方式
        private Valign _valign = ImagesSpaceName.Valign.bottom;    //水印圖片的垂直對齊方式
        private int _fontSize =14;                                //水印字體大小
        private string _fontColor = "#EBEBEB";                    //前景水印字體顏色
        private string _bgfontColor = "#000000";                //水印字體陰影顏色
        private string _fontFamily = "新細明體";                //水印字體名稱
        private int _imgWidth = 120;                            //最終圖片的寬度
        private int _imgHeight = 120;                            //最終圖片的高度

        private bool _scanleImg = false;                        //是否壓縮圖片

        public string ErrorInfo = null;                            //錯誤信息

        #endregion

        定義屬性#region 定義屬性
            
        /**//// <summary>
        /// 字體水平對齊
        /// </summary>
        public Align Align
        {
            set
            {
                _align = value;
            }
        }

        /**//// <summary>
        /// 字體垂直對齊
        /// </summary>
        public Valign Valign
        {
            set
            {
                _valign = value;
            }
        }

        /**//// <summary>
        /// 水印字體大小
        /// </summary>
        public int FontSize
        {
            set
            {
                _fontSize = value;
            }
        }

        /**//// <summary>
        /// 前景水印字體顏色
        /// </summary>
        public string FontColor
        {
            set
            {
                _fontColor = value;
            }
        }

        /**//// <summary>
        /// 水印字體名稱
        /// </summary>
        public string FontFamily
        {
            set
            {
                _fontFamily = value;
            }
        }

        /**//// <summary>
        /// 水印字體陰影顏色
        /// </summary>
        public string BgFontColor
        {
            set
            {
                _bgfontColor = value;
            }
        }

        /**//// <summary>
        /// 圖片寬度
        /// </summary>
        public int ImgWidth
        {
            get
            {
                return _imgWidth;
            }
            set
            {
                _imgWidth = value;
            }
        }

        /**//// <summary>
        /// 圖片高度
        /// </summary>
        public int ImgHeight
        {
            get
            {
                return _imgHeight;
            }
            set
            {
                _imgHeight = value;
            }
        }

        /**//// <summary>
        /// 是否壓縮圖片
        /// </summary>
        public bool ScanleImg
        {
            set
            {
                _scanleImg = value;
            }
        }


        #endregion

        初使化購選函數#region 初使化購選函數
        public WaterImage()
        {
        }
        #endregion

        給JPG圖片加水印  void WaterPicture(string,string, int)#region 給JPG圖片加水印  void WaterPicture(string,string, int)

        /**//// <summary>
        /// 生成水印圖片主流程
        /// </summary>
        private void WaterMain()
        {
            if(_scanleImg)
            {
                ScanleImage objScanle = new ScanleImage();
                _waterImage = objScanle.ScanleImg(_waterImage,_imgWidth,_imgHeight);
            }
            else
            {
                _imgWidth = _waterImage.Width;
                _imgHeight = _waterImage.Height;
            }

            MakeWater();
            
            if(_fileName==null)
            {
                SaveImage(_waterImage,ImageFormat.Jpeg);
            }
            else
            {
                SaveImage(_waterImage,ImageFormat.Jpeg,_fileName);
            }
    
        }

        /**//// <param name="FileName">圖片文件名</param>
        /// <param name="font">水印文字</param>
        public void WaterPicture(string fileName,string font)
        {
            if(this.ExistsFile(fileName))
            {
                if(this.GetFile_Ext(fileName)=="jpg")
                {
                    _waterImage = Image.FromFile(fileName);
                    _waterName = font;
                    this.WaterMain();
                }
                else
                {
                    this.ErrorInfo = "只能給圖片加水印";
                    throw new Exception("只能給圖片加水印");
                }
            }
            else
            {
                this.ErrorInfo = "不存在此文件";
                throw new Exception("不存在此文件");
            }
        }

        /**//// <param name="formName">要生成水印的圖片名</param>
        /// <param name="toName">生成水印後的圖片名</param>
        /// <param name="font">水印文字</param>
        public void WaterPicture(string formName,string toName, string font)
        {
            if(this.ExistsFile(formName))
            {
                if(this.GetFile_Ext(formName)=="jpg")
                {
                    _waterImage = Image.FromFile(formName);
                    _waterName = font;
                    _fileName = toName;
                    this.WaterMain();
                }
                else
                {
                    this.ErrorInfo = "只能給圖片加水印";
                    throw new Exception("只能給圖片加水印");
                }
            }
            else
            {
                this.ErrorInfo = "不存在此文件";
                throw new Exception("不存在此文件");
            }
        }

        /**//// <param name="fileStream">文件緩沖塊</param>
        /// <param name="font">水印文字</param>
        public void WaterPicture(System.IO.Stream fileStream,string font)
        {
            _waterImage = Image.FromStream(fileStream);
            _waterName = font;
            this.WaterMain();
        }

        /**//// <param name="fileStream">文件緩沖塊</param>
        /// <param name="fileName">要保存的文件名</param>
        /// <param name="font">水印文字</param>
        public void WaterPicture(System.IO.Stream fileStream,string fileName, string font)
        {
            _waterImage = Image.FromStream(fileStream);
            _waterName = font;
            _fileName = fileName;
            this.WaterMain();
        }

        /**//// <summary>
        /// 在圖片上制作水印
        /// </summary>
        private void MakeWater()
        {
            float iTop = 5;                        //顯示字體y坐標
            float iLeft = 5;                    //顯示字體X坐標
            System.Drawing.SizeF objFontSize;    //字體在繪圖區中所占的長寬
            System.Drawing.Brush objBrush;        //字體畫筆顏色

            Font waterFont = new Font(_fontFamily,_fontSize);

            try
            {
                System.Drawing.Graphics objGraphics = Graphics.FromImage(_waterImage);

                objGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;
                objFontSize = objGraphics.MeasureString(_waterName,waterFont);
                switch(_align)
                {
                    case ImagesSpaceName.Align.left:
                        iLeft = 0;
                        break;
                    case ImagesSpaceName.Align.center:
                        iLeft = (_waterImage.Width - objFontSize.Width)/2;
                        break;
                    case ImagesSpaceName.Align.right:
                        iLeft = _waterImage.Width - objFontSize.Width;
                        break;
                    default:
                        iLeft = 5;
                        break;
                }
                switch(_valign)
                {
                    case ImagesSpaceName.Valign.top:
                        iTop = 0;
                        break;
                    case ImagesSpaceName.Valign.middle:
                        iTop = (_waterImage.Height - objFontSize.Height)/2;
                        break;
                    case ImagesSpaceName.Valign.bottom:
                        iTop = _waterImage.Height - objFontSize.Height;
                        break;
                    default:
                        iTop = 5;
                        break;
                }
                objBrush = new SolidBrush(ColorTranslator.FromHtml(_bgfontColor));
                objGraphics.DrawString(_waterName,waterFont,objBrush,iLeft+1,iTop+1);
                objBrush = new SolidBrush(ColorTranslator.FromHtml(_fontColor));
                objGraphics.DrawString(_waterName,waterFont,objBrush,iLeft,iTop);
            }
            catch
            {
                this.ErrorInfo = "只有JPG圖片才能加水印";
                throw new Exception("只有JPG圖片才能加水印");
            }
        }

        #endregion

    }
}