public Color GetColor(string ID) { ColorMap map = Array.Find(Colors, c => c.ID == ID); return(map.Color); }
/// <summary> /// 图片等比缩放 /// </summary> /// <param name="fromFile">原图Stream对象</param> /// <param name="savePath">缩略图存放地址</param> /// <param name="targetWidth">指定的最大宽度</param> /// <param name="targetHeight">指定的最大高度</param> /// <param name="watermarkText">水印文字(为""表示不使用水印)</param> /// <param name="watermarkImage">水印图片路径(为""表示不使用水印)</param> public static void ZoomAuto(Image initImage, string savePath, Double targetWidth, Double targetHeight, string watermarkText, string watermarkImage) { //创建目录 string dir = Path.GetDirectoryName(savePath); if (!Directory.Exists(dir)) { Directory.CreateDirectory(dir); } //原始图片(获取原始图片创建对象,并使用流中嵌入的颜色管理信息) //原图宽高均小于模版,不作处理,直接保存 if (initImage.Width <= targetWidth && initImage.Height <= targetHeight) { //文字水印 if (watermarkText != "") { using (System.Drawing.Graphics gWater = System.Drawing.Graphics.FromImage(initImage)) { System.Drawing.Font fontWater = new Font("黑体", 10); System.Drawing.Brush brushWater = new SolidBrush(Color.White); gWater.DrawString(watermarkText, fontWater, brushWater, 10, 10); gWater.Dispose(); } } //透明图片水印 if (watermarkImage != "") { if (File.Exists(watermarkImage)) { //获取水印图片 using (System.Drawing.Image wrImage = System.Drawing.Image.FromFile(watermarkImage)) { //水印绘制条件:原始图片宽高均大于或等于水印图片 if (initImage.Width >= wrImage.Width && initImage.Height >= wrImage.Height) { Graphics gWater = Graphics.FromImage(initImage); //透明属性 ImageAttributes imgAttributes = new ImageAttributes(); ColorMap colorMap = new ColorMap(); colorMap.OldColor = Color.FromArgb(255, 0, 255, 0); colorMap.NewColor = Color.FromArgb(0, 0, 0, 0); ColorMap[] remapTable = { colorMap }; imgAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap); float[][] colorMatrixElements = { new float[] { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f }, new float[] { 0.0f, 1.0f, 0.0f, 0.0f, 0.0f }, new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f }, new float[] { 0.0f, 0.0f, 0.0f, 0.5f, 0.0f },//透明度:0.5 new float[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f } }; ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements); imgAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); gWater.DrawImage(wrImage, new Rectangle(initImage.Width - wrImage.Width, initImage.Height - wrImage.Height, wrImage.Width, wrImage.Height), 0, 0, wrImage.Width, wrImage.Height, GraphicsUnit.Pixel, imgAttributes); gWater.Dispose(); } wrImage.Dispose(); } } } //保存 initImage.Save(savePath, System.Drawing.Imaging.ImageFormat.Jpeg); } else { //缩略图宽、高计算 double newWidth = initImage.Width; double newHeight = initImage.Height; //宽大于高或宽等于高(横图或正方) if (initImage.Width > initImage.Height || initImage.Width == initImage.Height) { //如果宽大于模版 if (initImage.Width > targetWidth) { //宽按模版,高按比例缩放 newWidth = targetWidth; newHeight = initImage.Height * (targetWidth / initImage.Width); } } //高大于宽(竖图) else { //如果高大于模版 if (initImage.Height > targetHeight) { //高按模版,宽按比例缩放 newHeight = targetHeight; newWidth = initImage.Width * (targetHeight / initImage.Height); } } //生成新图 //新建一个bmp图片 System.Drawing.Image newImage = new System.Drawing.Bitmap((int)newWidth, (int)newHeight); //新建一个画板 System.Drawing.Graphics newG = System.Drawing.Graphics.FromImage(newImage); //设置质量 newG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; newG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //置背景色 newG.Clear(Color.White); //画图 newG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, newImage.Width, newImage.Height), new System.Drawing.Rectangle(0, 0, initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel); //文字水印 if (watermarkText != "") { using (System.Drawing.Graphics gWater = System.Drawing.Graphics.FromImage(newImage)) { System.Drawing.Font fontWater = new Font("宋体", 10); System.Drawing.Brush brushWater = new SolidBrush(Color.White); gWater.DrawString(watermarkText, fontWater, brushWater, 10, 10); gWater.Dispose(); } } //透明图片水印 if (watermarkImage != "") { if (File.Exists(watermarkImage)) { //获取水印图片 using (System.Drawing.Image wrImage = System.Drawing.Image.FromFile(watermarkImage)) { //水印绘制条件:原始图片宽高均大于或等于水印图片 if (newImage.Width >= wrImage.Width && newImage.Height >= wrImage.Height) { Graphics gWater = Graphics.FromImage(newImage); //透明属性 ImageAttributes imgAttributes = new ImageAttributes(); ColorMap colorMap = new ColorMap(); colorMap.OldColor = Color.FromArgb(255, 0, 255, 0); colorMap.NewColor = Color.FromArgb(0, 0, 0, 0); ColorMap[] remapTable = { colorMap }; imgAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap); float[][] colorMatrixElements = { new float[] { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f }, new float[] { 0.0f, 1.0f, 0.0f, 0.0f, 0.0f }, new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f }, new float[] { 0.0f, 0.0f, 0.0f, 0.5f, 0.0f },//透明度:0.5 new float[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f } }; ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements); imgAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); gWater.DrawImage(wrImage, new Rectangle(newImage.Width - wrImage.Width, newImage.Height - wrImage.Height, wrImage.Width, wrImage.Height), 0, 0, wrImage.Width, wrImage.Height, GraphicsUnit.Pixel, imgAttributes); gWater.Dispose(); } wrImage.Dispose(); } } } //保存缩略图 newImage.Save(savePath, System.Drawing.Imaging.ImageFormat.Jpeg); //释放资源 newG.Dispose(); newImage.Dispose(); initImage.Dispose(); } }