/// <summary>
/// Resizes the image around a focal point
/// Crops the image to the aspect ratio with the focal point as close to center as possible.
/// Will not stretch the image to the width and height since this will just be a bigger picture with the same details.
/// </summary>
/// <param name="image">The image to run the macro on</param>
/// <param name="x">The horizontal position of the focal point</param>
/// <param name="y">The y position of the focal point</param>
/// <param name="width">The width of the resulting image</param>
/// <param name="height">The height of the resulting image</param>
/// <param name="sourceWidth">The original image width</param>
/// <param name="sourceHeight">The original image height</param>
/// <returns></returns>
public static ImgixImage FocalResize(this ImgixImage image, int x, int y, int width,
int height, int sourceWidth, int sourceHeight)
{
var resizeRectangle = new Rectangle(width, height);
var imageRectangle = new Rectangle(sourceWidth, sourceHeight);
var cropRectangle = resizeRectangle.Match(imageRectangle);
var croppedImage = image.FocalCrop(x, y, cropRectangle.Width, cropRectangle.Height, sourceWidth,
sourceHeight);
return(!imageRectangle.CanHold(resizeRectangle) ? croppedImage : croppedImage.Width(width).Height(height));
}
/// <summary>
/// Crops the image around a focal point.
/// Will try and center on the focal point if possible, but if the crop falls outside the area of the image it will adjust.
/// Keeps the aspect of the crop.
/// </summary>
/// <param name="image">The image to run the macro on</param>
/// <param name="x">
/// The horizontal position of the focal point.
/// Interpreted as a percentage of the image width from the left.
/// Values 0.0 to 1.0
/// </param>
/// <param name="y">
/// The y position of the focal point.
/// Interpreted as a percentage of the image height from the top side.
/// Values 0.0 to 1.0
/// </param>
/// <param name="width">The width of the area to crop</param>
/// <param name="height">The height of the area to crop</param>
/// <param name="sourceWidth">The original image width</param>
/// <param name="sourceHeight">The original image height</param>
/// <exception cref="ArgumentOutOfRangeException">If either x or y is outside the 0.0 to 1.0 range</exception>
/// <returns></returns>
public static ImgixImage FocalCrop(this ImgixImage image, double x, double y, int width,
int height, int sourceWidth, int sourceHeight)
{
if (x < 0.0 && x > 1.0)
{
throw new ArgumentOutOfRangeException(nameof(x));
}
if (y < 0.0 && y > 1.0)
{
throw new ArgumentOutOfRangeException(nameof(y));
}
var focalPoint = new Point(Convert.ToInt32(sourceWidth * x), Convert.ToInt32(sourceHeight * y));
return(image.FocalCrop(focalPoint.X, focalPoint.Y, width, height, sourceWidth, sourceHeight));
}
