private static Rectangle GetImageCropRectangle(Size imgSize, Size cropSize, VerticalCropping verticalCropOption)
{
int x;
int y;
if (imgSize.Width != cropSize.Width)
{
throw new ArgumentException(string.Format
(
"For a vertical crop, current width ({0}) must match desired cropped width ({1}).",
imgSize.Width,
cropSize.Width
));
}
else if (imgSize.Height < cropSize.Height)
{
throw new ArgumentException(string.Format
(
"For a vertical crop, current height ({0}) must be greater than desired cropped height ({1}).",
imgSize.Height,
cropSize.Height
));
}
switch (verticalCropOption)
{
case VerticalCropping.Top:
x = 0;
y = 0;
break;
case VerticalCropping.Bottom:
x = 0;
y = imgSize.Height - cropSize.Height;
break;
default: // VerticalCropping.Center:
x = 0;
y = (imgSize.Height - cropSize.Height) / 2;
break;
}
return(new Rectangle(x, y, cropSize.Width, cropSize.Height));
}
/// <summary>
/// Resizes and crops the image to the given dimensions
/// </summary>
/// <param name="img">The image</param>
/// <param name="width">The desired width</param>
/// <param name="height">The desired height</param>
/// <returns>The resized image</returns>
public static Image Resize(Image img, int width, int height, HorizontalCropping cropH, VerticalCropping cropV)
{
// We only reduce size and crop, we don't magnify images
if (!(img.Width == width && img.Height == height))
{
if (width <= img.Width && height <= img.Height)
{
var xRecPos = 0;
var yRecPos = 0;
var xRatio = width / (double)img.Width;
var yRatio = height / (double)img.Height;
if (img.Height * xRatio < height)
{
img = Resize(img, Convert.ToInt32(img.Width * yRatio));
}
else
{
img = Resize(img, Convert.ToInt32(width));
}
if (cropH == HorizontalCropping.Center)
{
xRecPos = (img.Width - width) / 2;
}
else if (cropH == HorizontalCropping.Right)
{
xRecPos = img.Width - width;
}
if (cropV == VerticalCropping.Center)
{
yRecPos = (img.Height - height) / 2;
}
else if (cropV == VerticalCropping.Bottom)
{
yRecPos = img.Height - height;
}
var newRect = new Rectangle(xRecPos, yRecPos, width, height);
var orgBmp = new Bitmap(img);
var crpBmp = orgBmp.Clone(newRect, img.PixelFormat);
orgBmp.Dispose();
return((Image)crpBmp);
}
}
return(img);
}
