private static Bitmap ResizeImageFitLongestSide(Bitmap image, Size size, Color? spaceColor)
{
var colorSpace = spaceColor != null;
var sourceWidth = image.Width;
var sourceHeight = image.Height;
var nPercentW = ((float)sourceWidth / size.Width);
var nPercentH = ((float)sourceHeight / size.Height);
var nPercent = Math.Min(nPercentH, nPercentW);
var ufWidth = Math.Round(size.Width * nPercent);
if (ufWidth < size.Width && sourceWidth > ufWidth)
{
ufWidth = Math.Min(size.Width, sourceWidth);
}
var ufHeight = Math.Round(size.Height * nPercent);
if (ufHeight < size.Height && sourceHeight > ufHeight)
{
ufHeight = Math.Min(size.Height, sourceHeight);
}
var rect = new Rectangle((int)((sourceWidth - ufWidth) / 2),
(int)((sourceHeight - ufHeight) / 2), (int)ufWidth, (int)ufHeight);
var imageWidth = (int)Math.Min(ufWidth, size.Width);
var imageHeight = (int)Math.Min(ufHeight, size.Height);
if (!colorSpace)
{
var result = new Bitmap(imageWidth, imageHeight);
using (var graphics = Graphics.FromImage(result))
{
CustomizeGraphics(graphics);
graphics.DrawImage(Clone(image, rect), 0, 0, imageWidth, imageHeight);
}
return result;
}
else
{
var result = new Bitmap(size.Width, size.Height);
using (var graphics = Graphics.FromImage(result))
{
graphics.Clear(spaceColor.Value);
CustomizeGraphics(graphics);
var imgAttributes = new ImageAttributes();
imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelC, ColorAdjustType.Bitmap);
var clone = Clone(image, rect);
graphics.DrawImage(clone,
(int)((float)(size.Width - imageWidth) / 2),
(int)((float)(size.Height - imageHeight) / 2),
imageWidth,
imageHeight);
}
return result;
}
}
