private CGAffineTransform NodeToParentTransform()
{
if (_isTransformDirty) {
_transform = CGAffineTransform.MakeIdentity();
if (!IsRelativeAnchorPoint) {
_transform.Translate(TransformAnchor.X, TransformAnchor.Y);
}
_transform.Translate((int)Position.X, (int)Position.Y);
_transform.Rotate(Rotation.ToRadians());
_transform.Scale(ScaleX, ScaleY);
_transform.Translate(-TransformAnchor.X, -TransformAnchor.Y);
_isTransformDirty = false;
}
return _transform;
}
UIImage ScaleAndRotateImage(UIImage imageIn, UIImageOrientation orIn)
{
int kMaxResolution = 2048;
CGImage imgRef = imageIn.CGImage;
float width = imgRef.Width;
float height = imgRef.Height;
CGAffineTransform transform = CGAffineTransform.MakeIdentity();
RectangleF bounds = new RectangleF(0, 0, width, height);
if (width > kMaxResolution || height > kMaxResolution)
{
float ratio = width / height;
if (ratio > 1)
{
bounds.Width = kMaxResolution;
bounds.Height = bounds.Width / ratio;
}
else
{
bounds.Height = kMaxResolution;
bounds.Width = bounds.Height * ratio;
}
}
float scaleRatio = bounds.Width / width;
SizeF imageSize = new SizeF(width, height);
UIImageOrientation orient = orIn;
float boundHeight;
switch (orient)
{
case UIImageOrientation.Up: //EXIF = 1
transform = CGAffineTransform.MakeIdentity();
break;
case UIImageOrientation.UpMirrored: //EXIF = 2
transform = CGAffineTransform.MakeTranslation(imageSize.Width, 0f);
transform = CGAffineTransform.MakeScale(-1.0f, 1.0f);
break;
case UIImageOrientation.Down: //EXIF = 3
transform = CGAffineTransform.MakeTranslation(imageSize.Width, imageSize.Height);
transform = CGAffineTransform.Rotate(transform, (float)Math.PI);
break;
case UIImageOrientation.DownMirrored: //EXIF = 4
transform = CGAffineTransform.MakeTranslation(0f, imageSize.Height);
transform = CGAffineTransform.MakeScale(1.0f, -1.0f);
break;
case UIImageOrientation.LeftMirrored: //EXIF = 5
boundHeight = bounds.Height;
bounds.Height = bounds.Width;
bounds.Width = boundHeight;
transform = CGAffineTransform.MakeTranslation(imageSize.Height, imageSize.Width);
transform = CGAffineTransform.MakeScale(-1.0f, 1.0f);
transform = CGAffineTransform.Rotate(transform, 3.0f * (float)Math.PI / 2.0f);
break;
case UIImageOrientation.Left: //EXIF = 6
boundHeight = bounds.Height;
bounds.Height = bounds.Width;
bounds.Width = boundHeight;
transform = CGAffineTransform.MakeTranslation(0.0f, imageSize.Width);
transform = CGAffineTransform.Rotate(transform, 3.0f * (float)Math.PI / 2.0f);
break;
case UIImageOrientation.RightMirrored: //EXIF = 7
boundHeight = bounds.Height;
bounds.Height = bounds.Width;
bounds.Width = boundHeight;
transform = CGAffineTransform.MakeScale(-1.0f, 1.0f);
transform = CGAffineTransform.Rotate(transform, (float)Math.PI / 2.0f);
break;
case UIImageOrientation.Right: //EXIF = 8
boundHeight = bounds.Height;
bounds.Height = bounds.Width;
bounds.Width = boundHeight;
transform = CGAffineTransform.MakeTranslation(imageSize.Height, 0.0f);
transform = CGAffineTransform.Rotate(transform, (float)Math.PI / 2.0f);
break;
default:
throw new Exception("Invalid image orientation");
break;
}
UIGraphics.BeginImageContext(bounds.Size);
CGContext context = UIGraphics.GetCurrentContext();
if (orient == UIImageOrientation.Right || orient == UIImageOrientation.Left)
{
context.ScaleCTM(-scaleRatio, scaleRatio);
context.TranslateCTM(-height, 0);
}
else
{
context.ScaleCTM(scaleRatio, -scaleRatio);
context.TranslateCTM(0, -height);
}
context.ConcatCTM(transform);
context.DrawImage(new RectangleF(0, 0, width, height), imgRef);
UIImage imageCopy = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
return(imageCopy);
}