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public void MakeThumbnail( string sourceImagePath, string thumbnailPath, int width, int height, string mode)
-
{
-
Image originalImage = Image.FromFile (sourceImagePath);
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int x = 0;
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int y = 0;
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int ow = originalImage.Width;
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int oh = originalImage.Height;
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switch (mode)
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{
-
// 指定高寬縮放（可能變形）
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case "HW":
-
break;
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// 指定寬度，高度按比例
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case "W":
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height = originalImage.Height*width/originalImage.Width;
-
break;
-
// 指定高度，寬度按比例
-
case "H":
-
width = originalImage.Width*height/originalImage.Height;
-
break;
-
//指定高寬裁減（不變形）
-
case "CUT":
-
if ( ( ( double ) originalImage.Width )/originalImage.Height > ( ( double ) width)/height)
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{
-
oh = originalImage.Height;
-
ow = originalImage.Height*width/height;
-
y = 0;
-
x = (originalImage.Width - ow)/2;
-
}
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else
-
{
-
ow = originalImage.Width;
-
oh = originalImage.Width*height/width;
-
x = 0;
-
y = (originalImage.Height - oh)/2;
-
}
-
break;
-
default:
-
break;
-
}
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Image bitmap =
new Bitmap
(width, height
);
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Graphics g = Graphics.FromImage (bitmap);
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g.InterpolationMode = InterpolationMode.High;
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g.SmoothingMode = SmoothingMode.HighQuality;
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g.Clear (Color.Transparent );
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g.
DrawImage (originalImage,
new Rectangle
( 0,
0, width, height
),
new Rectangle
(x, y, ow, oh
), GraphicsUnit.
Pixel );
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bitmap.Save (thumbnailPath, ImageFormat.Png );
-
}