public UIImage Crop(UIImage image, RectangleF section)
{
// Start context.
UIGraphics.BeginImageContext(section.Size);
var ctx = UIGraphics.GetCurrentContext();
// Clear the image with red.
ctx.SetRGBFillColor(255, 255, 255, 255);
ctx.FillRect(new RectangleF(new PointF(0, 0), section.Size));
// Setting transform to flip the image.
var transform = new MonoTouch.CoreGraphics.CGAffineTransform(1, 0, 0, -1, 0, section.Height);
ctx.ConcatCTM(transform);
// Drawing the image.
var drawSource = CreateDrawRectangle(image, section);
ctx.DrawImage(drawSource, image.CGImage.WithImageInRect(section));
// Extracting the image and ending.
var croppedImage = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
return croppedImage;
}
private void MirrorImage()
{
UIGraphics.BeginImageContext(profilePicture.Size);
var ctx = UIGraphics.GetCurrentContext();
ctx.TranslateCTM(profilePicture.Size.Width, 0);
ctx.ScaleCTM(-1, 1);
var transform = new MonoTouch.CoreGraphics.CGAffineTransform(1, 0, 0, -1, 0, profilePicture.Size.Height);
ctx.ConcatCTM(transform);
ctx.DrawImage(new RectangleF(new PointF(0, 0), profilePicture.Size), profilePicture.CGImage);
profilePicture = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
profilePictureView.Image = profilePicture;
}