/// <summary>
/// 生成縮略圖 並加水印
/// </summary>
/// <param name="originalImagePath">源圖路徑(物理路徑)</param>
/// <param name="thumbnailPath">縮略圖路徑(物理路徑)</param>
/// <param name="width">縮略圖寬度</param>
/// <param name="height">縮略圖高度</param>
/// <param name="mode">生成縮略圖的方式</param>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
{
Image originalImage = Image.FromFile(originalImagePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
switch (mode)
{
case "HW"://指定高寬縮放(可能變形)
break;
case "W"://指定寬,高按比例
toheight = originalImage.Height * width / originalImage.Width;
break;
case "H"://指定高,寬按比例
towidth = originalImage.Width * height / originalImage.Height;
break;
case "Cut"://指定高寬裁減
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 "CutA"://指定高寬裁減(不變形)自定義
if (ow <= towidth && oh <= toheight)
{
x = -(towidth - ow) / 2;
y = -(toheight - oh) / 2;
ow = towidth;
oh = toheight;
}
else
{
if (ow > oh)//寬大於高
{
x = 0;
y = -(ow - oh) / 2;
oh = ow;
}
else//高大於寬
{
y = 0;
x = -(oh - ow) / 2;
ow = oh;
}
}
break;
default:
break;
}
//新建一個bmp圖片
Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
//新建一個畫板
Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//設置高質量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//設置高質量,低速度呈現平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空畫布並以白色背景色填充
g.Clear(Color.White);
//在指定位置並且按指定大小繪製原圖片的指定部分
g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
new Rectangle(x, y, ow, oh),
GraphicsUnit.Pixel);
//文字水印
System.Drawing.Graphics testGrahpics = System.Drawing.Graphics.FromImage(bitmap);
System.Drawing.Font font = new System.Drawing.Font("宋體", 14, System.Drawing.FontStyle.Bold);
System.Drawing.Brush brush = new System.Drawing.SolidBrush(System.Drawing.Color.Gray);
//分行
string sInput = "Idgecn"; //獲取輸入的水印文字
int coloum = 60; //獲取每行的字符數
//利用循環,來依次輸出
for (int i = 0, j = 0; i < sInput.Length; i += coloum, j++)
{
//若要修改水印文字在照片上的位置,可將20修改成你想要的任何值
if (j != sInput.Length / coloum)
{
string s = sInput.Substring(i, coloum);
testGrahpics.DrawString(s, font, brush, 110, 10 * (i / coloum + 1));
}
else
{
string s = sInput.Substring(i, sInput.Length % coloum);
testGrahpics.DrawString(s, font, brush, 110, 10 * (j + 1));
}
}
testGrahpics.Dispose();
try
{
//以jpg格式保存縮略圖
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
生成縮略圖並添加水印
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