The Piece of Code2016. 2. 10. 00:48

Winform 에서 Image Resize 할 때 사용되는 코드입니다.

Stack Overflow에서 보았던 소스를 적어 둡니다.


public static System.Drawing.Image Resize(Image image, int Width, int Height, bool needToFill)
{
	int sourceWidth = image.Width;
	int sourceHeight = image.Height;
	int sourceX = 0;
	int sourceY = 0;
	double destX = 0;
	double destY = 0;

	double nScale = 0;
	double nScaleW = 0;
	double nScaleH = 0;

	nScaleW = ((double)Width / (double)sourceWidth);
	nScaleH = ((double)Height / (double)sourceHeight);
	if (!needToFill)
	{
		nScale = Math.Min(nScaleH, nScaleW);
	}
	else
	{
		nScale = Math.Max(nScaleH, nScaleW);
		destY = (Height - sourceHeight * nScale) / 2;
		destX = (Width - sourceWidth * nScale) / 2;
	}

	if (nScale > 1)
		nScale = 1;

	int destWidth = (int)Math.Round(sourceWidth * nScale);
	int destHeight = (int)Math.Round(sourceHeight * nScale);

	System.Drawing.Bitmap bmPhoto = null;
	try
	{
		bmPhoto = new System.Drawing.Bitmap(destWidth + (int)Math.Round(2 * destX), destHeight + (int)Math.Round(2 * destY));
	}
	catch (Exception ex)
	{
		throw new ApplicationException(string.Format("destWidth:{0}, destX:{1}, destHeight:{2}, desxtY:{3}, Width:{4}, Height:{5}",
			destWidth, destX, destHeight, destY, Width, Height), ex);
	}
	using (System.Drawing.Graphics grPhoto = System.Drawing.Graphics.FromImage(bmPhoto))
	{
		//grPhoto.InterpolationMode = _interpolationMode;
		//grPhoto.CompositingQuality = _compositingQuality;
		//grPhoto.SmoothingMode = _smoothingMode;

		Rectangle to = new System.Drawing.Rectangle((int)Math.Round(destX), (int)Math.Round(destY), destWidth, destHeight);
		Rectangle from = new System.Drawing.Rectangle(sourceX, sourceY, sourceWidth, sourceHeight);
		grPhoto.DrawImage(image, to, from, System.Drawing.GraphicsUnit.Pixel);

		return bmPhoto;
	}
}

출처: http://stackoverflow.com/questions/10323633/resize-image-in-c-sharp-with-aspect-ratio-and-crop-central-image-so-there-are-no

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