Exemplo n.º 1
0
 public ImageSizeType(int width, int height, bool markSuare, bool cut, string extname, ImageMakeMode type,ImageWaterMark watermark)
 {
     this.width = width;
     this.height = height;
     this.markSuare = markSuare;
     this.cut = cut;
     this.extname = extname;
     this.type = type;
     this.watermark = watermark;
 }
Exemplo n.º 2
0
        /// <summary>
        /// 生成缩略图
        /// </summary>
        /// <param name="originalImagePath">源图路径(物理路径)</param>
        /// <param name="thumbnailPath">缩略图路径(物理路径)</param>
        /// <param name="width">缩略图宽度</param>
        /// <param name="height">缩略图高度</param>
        /// <param name="mode">生成缩略图的方式</param>    
        public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, ImageMakeMode mode,ImageWaterMark watermark)
        {
            Image originalImage = Image.FromFile(originalImagePath);

            Image bitmap =
            MakeThumbnail(width, height, mode, originalImage, watermark);

            try
            {
                //以jpg格式保存缩略图
                bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
            }
            catch (System.Exception e)
            {
                throw e;
            }
            finally
            {
                originalImage.Dispose();
                bitmap.Dispose();
            }
        }
Exemplo n.º 3
0
        public static Image MakeThumbnail(int width, int height, ImageMakeMode mode, Image originalImage,ImageWaterMark watermark)
        {
            Image bitmap;
            Graphics g;

            int towidth = width;
            int toheight = height;

            int x = 0;
            int y = 0;
            int ow = originalImage.Width;
            int oh = originalImage.Height;

            switch (mode)
            {
                case ImageMakeMode.HW://指定高宽缩放(可能变形)
                    break;
                case ImageMakeMode.W://指定宽,高按比例
                    toheight = originalImage.Height * width / originalImage.Width;
                    break;
                case ImageMakeMode.WButOnlyShrink://指定宽,高按比例,但仅缩小,小于高度的图片不会放大
                    if (originalImage.Width <= towidth)
                    {
                        towidth = originalImage.Width;
                        toheight = originalImage.Height;
                    }
                    else
                    {
                        toheight = originalImage.Height * width / originalImage.Width;
                    }
                    break;
                case ImageMakeMode.H://指定高,宽按比例
                    towidth = originalImage.Width * height / originalImage.Height;
                    break;
                case ImageMakeMode.HButOnlyShrink://指定高,宽按比例,但仅缩小,小于高度的图片不会被放大
                    if (originalImage.Height <= toheight)
                    {
                        towidth = originalImage.Width;
                        toheight = originalImage.Height;
                    }
                    else
                    {
                        towidth = originalImage.Width * height / originalImage.Height;
                    }
                    break;
                case ImageMakeMode.Cut://指定高宽裁减
                    if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
                    {
                        oh = originalImage.Height;
                        ow = originalImage.Height * towidth / toheight;
                        y = 0;
                        x = (originalImage.Width - ow) / 2;
                    }
                    else
                    {
                        ow = originalImage.Width;
                        oh = originalImage.Width * height / towidth;
                        x = 0;
                        y = (originalImage.Height - oh) / 2;
                    }
                    break;
                case ImageMakeMode.CutA://指定高宽裁减(不变形)自定义
                    if (ow <= towidth && oh <= toheight)
                    {
                        x = -(towidth - ow) / 2;
                        y = -(toheight - oh) / 2;
                        ow = towidth;
                        oh = toheight;
                    }
                    else
                    {
                        if (ow > oh)//宽大于高
                        {
                            x = 0;
                            y = -(ow - oh) / 2;
                            oh = ow;
                        }
                        else//高大于宽
                        {
                            y = 0;
                            x = -(oh - ow) / 2;
                            ow = oh;
                        }
                    }
                    break;
                default:
                    break;
            }

            //新建一个bmp图片
            bitmap = new System.Drawing.Bitmap(towidth, toheight);

            //新建一个画板
            g = System.Drawing.Graphics.FromImage(bitmap);

            //设置高质量插值法
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

            //设置高质量,低速度呈现平滑程度
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            //清空画布并以白色背景色填充
            g.Clear(Color.White);

            //在指定位置并且按指定大小绘制原图片的指定部分
            g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
             new Rectangle(x, y, ow, oh),
             GraphicsUnit.Pixel);

            //放置水印
            if (watermark != null)
            {
                if (watermark.WaterPicOn)
                {
                    Image waterimg = null;
                    try
                    {
                        waterimg = Image.FromFile(watermark.WaterPicPath);
                    }
                    catch { }
                    if (waterimg != null)
                    {
                        g.DrawImage(waterimg,
                                    new Rectangle(
                                                bitmap.Width-waterimg.Width-watermark.WaterPicMarginRight,
                                                bitmap.Height-waterimg.Height-watermark.WaterPicMarginBottom,
                                                waterimg.Width,
                                                waterimg.Height),
                                    0,
                                    0,
                                    waterimg.Width,
                                    waterimg.Height,
                                    GraphicsUnit.Pixel
                                    );
                    }
                }
            }

            g.Dispose();

            return bitmap;
        }