fsimage.cs

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//======================================================
//==     (c)2008 aspxcms inc by NeTCMS v1.0              ==
//==          Forum:bbs.aspxcms.com                   ==
//==         Website:www.aspxcms.com                  ==
//======================================================
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Web;
using System.Drawing;
using System.Drawing.Imaging;

namespace NetCMS.Content.Common
{
    /// <summary>
    /// 生成水印、缩略图、生成有指定内容的图片
    /// </summary>
    public class FSImage
    {
        private int _width;
        private int _height;
        private string _title = "www.netcms";    //文字标题
        private Color _bgcolor = Color.White;
        private int _fontsize = 14;  //字号
        private string _familyname = "仿宋";   //字体
        private FontStyle _fontstyle = FontStyle.Regular;
        private Color _forcecolor = Color.Black;
        private string _filepath = "";   //获取路径及文件名
        private PointF _txtpos;
        private long _quality =100;
        private string _waterpos = "0";
        private string _waterpath = "";
        /// <summary>
        /// 构建函数
        /// </summary>
        /// <param name="width">生成图片的宽度。
        /// 如果小于或等于零：高度也小于或等于零，则图片按原图的大小（水印或缩略图）或标题文字的大小生成图片；如高度大于零，则按高度优先比例缩放原图
        /// 如果大于零：高度也大于零，按指定大小生成新图片；如果高度小于等于零，则按宽度优先比较缩放图片</param>
        /// <param name="height">图片高度，见图片宽度注释</param>
        /// <param name="filepath">原文件物理磁盘路径（水印、缩略图）或保存文件路径（按文字生成图片）</param>
        public FSImage(int width, int height, string filepath)
        {
            _txtpos = new PointF(-1, -1);
            _width = width;
            _height = height;
            _filepath = filepath.Replace("/","\\");
        }
        /// <summary>
        /// 水印或生成图片的文字,默认为:www.netcms
        /// </summary>
        public string Title
        {
            set { _title = value; }
            get { return _title; }
        }
        /// <summary>
        /// 以像素为单位的字体大小，默认为：14
        /// </summary>
        public int FontSize
        {
            get { return _fontsize; }
            set { _fontsize = value; }
        }
        /// <summary>
        /// 设置新图片的背景色,默认为透明
        /// </summary>
        public Color BackGroudColor
        {
            get { return _bgcolor; }
            set { _bgcolor = value; }
        }
        /// <summary>
        /// 采用的字体名称,默认为仿宋体
        /// </summary>
        public string FontFamilyName
        {
            get { return _familyname; }
            set { _familyname = value; }
        }
        /// <summary>
        /// 设置字体样式,默认为普通文本
        /// </summary>
        public FontStyle StrStyle
        {
            set { _fontstyle = value; }
            get { return _fontstyle; }
        }
        /// <summary>
        /// 水印文字的颜色,默认为红色
        /// </summary>
        public Color FontColor
        {
            set { _forcecolor = value; }
            get { return _forcecolor; }
        }
        /// <summary>
        /// 水印文本的位置坐标,以图片的左上角为原点,默认位置为图片的右下角
        /// 如果x座标小于零则文字在图片的右边,如果y座标小于0则文字在图片的下边
        /// 设置时注意这个位置是从文字的左上角为原点,如(0,0)表示文字在图片的左上角
        /// </summary>
        public PointF TextPos
        {
            set { _txtpos.X = value.X; _txtpos.Y = value.Y; }
            get { return _txtpos; }
        }

        /// <summary>
        /// 输出图片质量，质量范围0-100,类型为long
        /// </summary>
        public long Quality
        {
            get { return _quality; }
            set { _quality = value; }
        }

        /// <summary>
        /// 水印位置
        /// </summary>
        public string Waterpos
        {
            get { return _waterpos; }
            set { _waterpos = value; }
        }

        /// <summary>
        /// 水印图片宽度
        /// </summary>
        public int Width
        {
            get { return _width; }
            set { _width = value; }
        }

        /// <summary>
        /// 水印图片高度
        /// </summary>
        public int Height
        {
            get { return _height; }
            set { _height = value; }
        }

        /// <summary>
        /// 水印图片地址
        /// </summary>
        public string WaterPath
        {
            get { return _waterpath; }
            set { _waterpath = value; }
        }

        /// <summary>
        /// 生成文字水印
        /// </summary>
        public void Watermark()
        {
            if (_title == null || _title.Equals(""))
                throw new NullReferenceException("图片标题为空!");
            ImageFormat format = GetFormat();
            if (!File.Exists(_filepath))
                throw new FileNotFoundException("指定路径的文件不存在");
            Graphics g;
            Bitmap bitmap = GetBitmap(out g);
            Font f = new Font(_familyname, _fontsize, _fontstyle, GraphicsUnit.Pixel);
            SizeF size = g.MeasureString(_title, f);
            switch (_waterpos)
            {
                case "1":
                    _txtpos.X = ((float)_width * (float).01) + (size.Width / 2) - 20;
                    _txtpos.Y = (float)_height * (float).01;
                    break;
                case "3":
                    _txtpos.X = ((float)_width * (float).99) - (size.Width);
                    _txtpos.Y = (float)_height * (float).01;
                    break;
                case "4":
                    _txtpos.X = ((float)_width * (float).99) - (size.Width);
                    _txtpos.Y = ((float)_height * (float).99) - size.Height;
                    break;
                case "2":
                    _txtpos.X = ((float)_width * (float).01) + (size.Width / 2) - 20;
                    _txtpos.Y = ((float)_height * (float).99) - size.Height;
                    break;
                default:
                    _txtpos.X = ((float)_width * (float).50) - 20;
                    _txtpos.Y = ((float)_height * (float).50);
                    break;
            }
            Brush b = new SolidBrush(_forcecolor);
            g.DrawString(_title, f, b, _txtpos);
            g.Dispose();
            bitmap.Save(_filepath, format);
            bitmap.Dispose();
        }
        /// <summary>
        /// 生成缩略图
        /// </summary>
        /// <param name="newpath">缩略图的保存物理路径（包括文件名），如果为null或空则覆盖原图</param>
        public void Thumbnail(string newpath)
        {
            ImageFormat format = GetFormat();
            if (!File.Exists(_filepath))
                throw new FileNotFoundException("指定路径的文件不存在");
            Graphics g;
            Bitmap bitmap = GetBitmap(out g);
            if (newpath == null || newpath.Trim().Equals(""))
                bitmap.Save(_filepath, format);
            else
            {
                newpath = newpath.Replace("/","\\");
                if (newpath.IndexOf("\\") > 0)
                {
                    string dir = newpath.Substring(0, newpath.LastIndexOf("\\"));
                    if (!Directory.Exists(dir))
                    {
                        Directory.CreateDirectory(dir);
                    }
                }
                bitmap.Save(newpath, format);
            }
            g.Dispose();