asp.Net高品質サムネイル汎用関数(c#コード)を生成し、多種の生成方式をサポートする
3600 ワード
, . asp com , .net . ( ), .net sdk .QQROOM 4 .
/**//// <summary>
///
/// </summary>
/// <param name="originalImagePath"> （ ）</param>
/// <param name="thumbnailPath"> （ ）</param>
/// <param name="width"> </param>
/// <param name="height"> </param>
/// <param name="mode"> </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":// （ ）
break;
case "W":// ，
toheight = originalImage.Height * width/originalImage.Width;
break;
case "H":// ，
towidth = originalImage.Width * height/originalImage.Height;
break;
case "Cut":// （ ）
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;
default :
break;
}
// bmp
Image bitmap = new System.Drawing.Bitmap(towidth,toheight);
//
Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
// ,
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//
g.Clear(Color.Transparent);
//
g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
new Rectangle(x, y, ow,oh),
GraphicsUnit.Pixel);
try
{
// jpg
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch(System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}