圖形類（八）

//*************************************************************************************************
//完成日期： 2004-11-5
//作者：     何利民
//程序功能： 生成水印圖片
//             注：如是利用圖片作為水印，則調用時最後都多加一數字參數
//*************************************************************************************************
using System;
using System.Drawing;
using System.Drawing.Text;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

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 WaterTitle _waterTitle = ImagesSpaceName.WaterTitle.none;//水印標題

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

        private Image _waterPic = null;                            //要附加到圖片中去的水印圖片對象

        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;
            }
        }

        public WaterTitle WaterTitle
        {
            set
            {
                _waterTitle = 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 saveName, string font)
        {
            if(this.ExistsFile(formName))
            {
                if(this.GetFile_Ext(formName)=="jpg")
                {
                    _waterImage = Image.FromFile(formName);
                    _waterName = font;
                    _fileName = saveName;
                    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 saveName, string font)
        {
            _waterImage = Image.FromStream(fileStream);
            _waterName = font;
            _fileName = saveName;
            this.WaterMain();
        }

        /**//// <param name="fileStream">要生成水印圖片的緩沖塊</param>
        /// <param name="waterStream">水印圖片緩沖塊</param>
        /// <param name="iLog">只要是數字就行（圖片作為水印）</param>
        public void WaterPicture(System.IO.Stream fileStream,System.IO.Stream waterStream,int iLog)
        {
            _waterImage = Image.FromStream(fileStream);
            _waterPic = Image.FromStream(waterStream);
            this.WaterMain();
        }

        /**//// <param name="fileStream">要生成水印圖片的緩沖塊</param>
        /// <param name="waterFile">水印圖片文件名</param>
        /// <param name="iLog">只要是數字就行（圖片作為水印）</param>
        public void WaterPicture(System.IO.Stream fileStream,string waterFile,int iLog)
        {
            _waterImage = Image.FromStream(fileStream);
            _waterPic = Image.FromFile(waterFile);
            this.WaterMain();
        }
            
        /**//// <param name="fileStream">要生成水印圖片的緩沖塊</param>
        /// <param name="waterStream">水印圖片緩沖塊</param>
        /// <param name="fileName">最終圖片保存為</param>
        /// <param name="iLog">只要是數字就行（圖片作為水印）</param>
        public void WaterPicture(System.IO.Stream fileStream,System.IO.Stream waterStream,string saveName,int iLog)
        {
            _waterImage = Image.FromStream(fileStream);
            _waterPic = Image.FromStream(waterStream);
            _fileName = saveName;
            this.WaterMain();
        }

        /**//// <param name="fileStream">要生成水印圖片的緩沖塊</param>
        /// <param name="waterFile">水印圖片文件名</param>
        /// <param name="fileName">最終圖片保存為</param>
        /// <param name="iLog">只要是數字就行（圖片作為水印）</param>
        public void WaterPicture(System.IO.Stream fileStream,string waterFile,string saveName,int iLog)
        {
            _waterImage = Image.FromStream(fileStream);
            _waterPic = Image.FromFile(waterFile);
            _fileName = saveName;
            this.WaterMain();
        }

        /**//// <param name="fileName">要生成水印的圖片名</param>
        /// <param name="waterStream">水印圖片緩沖塊</param>
        /// <param name="iLog">只要是數字就行（圖片作為水印）</param>
        public void WaterPicture(string fileName,System.IO.Stream waterStream,int iLog)
        {
            _waterImage = Image.FromFile(fileName);
            _waterPic = Image.FromStream(waterStream);
            this.WaterMain();
        }

        /**//// <param name="fileName">要生成水印的圖片名</param>
        /// <param name="waterName">水印圖片文件名</param>
        /// <param name="iLog">只要是數字就行（圖片作為水印）</param>
        public void WaterPicture(string fileName,string waterName,int iLog)
        {
            _waterImage = Image.FromFile(fileName);
            _waterPic = Image.FromFile(waterName);
            this.WaterMain();
        }

        /**//// <param name="fileName">要生成水印的圖片名</param>
        /// <param name="waterStream">水印圖片緩沖塊</param>
        /// <param name="saveName">最終圖片保存為</param>
        /// <param name="iLog">只要是數字就行（圖片作為水印）</param>
        public void WaterPicture(string fileName,System.IO.Stream waterStream,string saveName,int iLog)
        {
            _waterImage = Image.FromFile(fileName);
            _waterPic = Image.FromStream(waterStream);
            _fileName = saveName;
            this.WaterMain();
        }

        /**//// <param name="fileName">要生成水印的圖片名</param>
        /// <param name="waterName">水印圖片文件名</param>
        /// <param name="saveName">最終圖片保存為</param>
        /// <param name="iLog">只要是數字就行（圖片作為水印）</param>
        public void WaterPicture(string fileName,string waterName,string saveName,int iLog)
        {
            _waterImage = Image.FromFile(fileName);
            _waterPic = Image.FromFile(waterName);
            _fileName = saveName;
            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 = this.GetDrawing();

                if(_waterPic==null)
                {
                    objGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;
                    objFontSize = objGraphics.MeasureString(_waterName,waterFont);
                    iLeft = this.GetWaterX((int)objFontSize.Width);
                    iTop = this.GetWaterY((int)objFontSize.Height);
                    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);
                }
                else
                {
                    iLeft = this.GetWaterX(_waterPic.Width);
                    iTop = this.GetWaterY(_waterPic.Height);
                    System.Drawing.Rectangle rectangle = new Rectangle((int)iLeft,(int)iTop,_waterPic.Width,_waterPic.Height);
                    objGraphics.DrawImage(_waterPic,rectangle,0,0,_waterPic.Width,_waterPic.Height,GraphicsUnit.Pixel);
                }

            }
            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");
            }
        }

        /**//// <summary>
        /// 獲得繪圖區
        /// </summary>
        private System.Drawing.Graphics GetDrawing()
        {
            try
            {
                int iHeight = 20;
                if(_waterPic!=null)  iHeight = _waterPic.Height;
                System.Drawing.Bitmap bitmap = new Bitmap(_waterImage.Width,_waterImage.Height+iHeight);
                Graphics objGraphics = Graphics.FromImage(bitmap);
                System.Drawing.Rectangle rectangle;
                switch(_waterTitle)
                {
                    case ImagesSpaceName.WaterTitle.bottom:
                        rectangle = new Rectangle(0,0,_waterImage.Width,_waterImage.Height);
                        objGraphics.DrawImage(_waterImage,rectangle,0,0,_waterImage.Width,_waterImage.Height,GraphicsUnit.Pixel);
                        _waterImage = bitmap;
                        break;
                    case ImagesSpaceName.WaterTitle.top:
                        rectangle = new Rectangle(0,iHeight,_waterImage.Width,_waterImage.Height);
                        objGraphics.DrawImage(_waterImage,rectangle,0,0,_waterImage.Width,_waterImage.Height,GraphicsUnit.Pixel);
                        _waterImage = bitmap;
                        break;
                    default:
                        objGraphics = Graphics.FromImage(_waterImage);
                        break;
                }
                return objGraphics;

            }
            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");
            }
        }

        /**//// <summary>
        /// 取得顯示水印左上解點的X座標
        /// </summary>
        /// <param name="objFontSize">字體在繪圖區中所占的長寬</param>
        private float GetWaterX(int iWidth)
        {
            float iLeft = 0;
            switch(_align)
            {
                case ImagesSpaceName.Align.left:
                    iLeft = 0;
                    break;
                case ImagesSpaceName.Align.center:
                    iLeft = (_waterImage.Width - iWidth)/2;
                    break;
                case ImagesSpaceName.Align.right:
                    iLeft = _waterImage.Width - iWidth;
                    break;
                default:
                    iLeft = 5;
                    break;
            }
            return iLeft;
        }


        /**//// <summary>
        /// 取得顯示水印左上解點的Y座標
        /// </summary>
        /// <param name="objFontSize">字體在繪圖區中所占的長寬</param>
        private float GetWaterY(int iHeight)
        {
            float iTop = 0;
            if(_waterTitle==ImagesSpaceName.WaterTitle.top)
            {
                iTop = 0;
            }
            else if(_waterTitle==ImagesSpaceName.WaterTitle.bottom)
            {
                iTop = _waterImage.Height - iHeight;
            }
            else
            {
                switch(_valign)
                {
                    case ImagesSpaceName.Valign.top:
                        iTop = 0;
                        break;
                    case ImagesSpaceName.Valign.middle:
                        iTop = (_waterImage.Height - iHeight)/2;
                        break;
                    case ImagesSpaceName.Valign.bottom:
                        iTop = _waterImage.Height - iHeight;
                        break;
                    default:
                        iTop = 5;
                        break;
                }
            }
            return iTop;
        }

        #endregion



    }
}