/// <summary>
/// 设置水印
/// </summary>
/// <param name="original"></param>
/// <param name="watermark"></param>
/// <returns></returns>
public Image MakeWatermark(Image original, Watermark watermark)
{
//Bitmap b = new Bitmap(original.Width, original.Height, PixelFormat.Format24bppRgb);
//b.SetResolution(original.HorizontalResolution, original.VerticalResolution);
// 不加水印
if (watermark.Ratio < 0)
{
return(original);
}
//当ratio大于1时，加的部分水印会在图片外面(不显示)
Size markSize = new Size((int)Math.Round(watermark.Ratio * original.Width), (int)Math.Round(watermark.Ratio * original.Height));
watermark.SetSize(markSize);
switch (watermark.WatermarkType)
{
case WatermarkType.Text:
//添加文字水印
var textWm = watermark as TextWatermark;
if (!string.IsNullOrEmpty(textWm.Text))
{
textWm.HorizontalResolution = original.HorizontalResolution; // b.HorizontalResolution;
textWm.VerticalResolution = original.VerticalResolution; // b.VerticalResolution;
var textMark = this.CreateTextWatermark(textWm);
ImageWatermark imageWm = new ImageWatermark()
{
Alignment = textWm.Alignment,
Alpha = textWm.Alpha,
Image = textMark,
MarginPercentage = textWm.MarginPercentage,
Ratio = textWm.Ratio,
};
imageWm.SetSize(textWm.Size);
return(MakeImageWatermark(original, imageWm));
}
break;
case WatermarkType.Image:
return(MakeImageWatermark(original, watermark as ImageWatermark));
break;
default:
break;
}
return(original);
}
/// <summary>
/// 保存图片
/// </summary>
/// <param name="originalFile"></param>
/// <param name="savePath"></param>
/// <param name="maxWidth"></param>
/// <param name="maxHeight"></param>
/// <param name="isCutOverRange">从内部适配长/宽，多的切除，取中段</param>
/// <returns></returns>
public string SaveImage(Image originalFile, string savePath, int maxWidth, int maxHeight, Watermark watermark, bool isCutOverRange = false)
{
if (originalFile == null || string.IsNullOrEmpty(savePath))
{
return(string.Empty);
}
if (!Directory.Exists(savePath))
{
Directory.CreateDirectory(savePath);
}
var formalImage = SaveImage(originalFile, maxWidth, maxHeight, watermark, isCutOverRange);
var fileName = DateTimeExtensions.GetRandomString(DateTime.Now) + ".jpeg";
var file = SaveTo(formalImage, savePath, fileName);
return(Path.Combine(savePath, fileName));
}
/// <summary>
/// 按比例格式化图片
/// </summary>
/// <param name="original"></param>
/// <param name="maxWidth"></param>
/// <param name="maxHeight"></param>
/// <param name="isCutOverRange">从内部适配长/宽，多的切除，取中段</param>
/// <returns></returns>
private Image SaveImage(Image original, int maxWidth, int maxHeight, Watermark waterMark, bool isCutOverRange = false)
{
if (original == null)
{
return(original);
}
Image response = null;
var x = 0d;
var y = 0d;
var width = 0d;
var height = 0d;
//get minimal image
if (original.Width > maxWidth)
{
x = (original.Width - maxWidth) / 2d;
width = maxWidth;
}
else
{
width = original.Width;
}
if (original.Height > maxWidth)
{
y = (original.Height - maxHeight) / 2.0d;
height = maxHeight;
}
else
{
height = original.Height;
}
if (isCutOverRange)
{
//var crossWidth = width;
//var crossHeight = height;
var widthRatio = width / maxWidth * 1d;
var heightRatio = height / maxHeight * 1d;
if (widthRatio >= heightRatio)
{
width = maxWidth * heightRatio;
}
else
{
height = maxHeight * widthRatio;
}
x = (original.Width - width) / 2d;
y = (original.Height - height) / 2d;
}
//用指定的大小和格式初始化 Bitmap 类的新实例
//Bitmap bitmap = new Bitmap((int)width, (int)height, PixelFormat.Format32bppArgb);
Bitmap bitmap = new Bitmap((int)width, (int)height);
bitmap.SetResolution(original.VerticalResolution, original.HorizontalResolution);
Graphics graphics = Graphics.FromImage(bitmap);
graphics.Clear(Color.Transparent);
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.InterpolationMode = InterpolationMode.High;
graphics.DrawImage(original, 0, 0, new Rectangle((int)x, (int)y, (int)width, (int)height), GraphicsUnit.Pixel);
graphics.Save();
graphics.Dispose();
response = bitmap;
if (waterMark != null)
{
response = new ImageWatermarkMaker().MakeWatermark(bitmap, waterMark);
}
return(response);
}