Пример #1
0
        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;
        }
Пример #2
0
        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;
        }