C# CGSize类代码示例

        public HIPImageCropperView(CGRect frame, CGSize cropSize, CropperViewPosition position, CropHoleType cropHoleType = CropHoleType.Square)
            : base(frame)
        {
            _maskPosition = position;
            _cropHoleType = cropHoleType;
            _cropSize = cropSize;
            this.BackgroundColor = UIColor.Black;
            this.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
            this.ClipsToBounds = true;

            ScrollView = new UIScrollView();

            ImageView = new UIImageView();

            OverlayView = new UIView()
            {
                UserInteractionEnabled = false,
                BackgroundColor = UIColor.Black.ColorWithAlpha(0.6f),
                AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight
            };

            LoadIndicator = new UIActivityIndicatorView(UIActivityIndicatorViewStyle.White)
            {
                HidesWhenStopped = true,
                AutoresizingMask = UIViewAutoresizing.FlexibleLeftMargin |
                UIViewAutoresizing.FlexibleRightMargin |
                UIViewAutoresizing.FlexibleBottomMargin |
                UIViewAutoresizing.FlexibleTopMargin
            };
        }

		protected override void CreateFrameBuffer ()
		{
			nfloat screenScale = UIScreen.MainScreen.Scale;
			CAEAGLLayer eaglLayer = (CAEAGLLayer) Layer;
			CGSize size = new CGSize (
				(int) Math.Round (screenScale * eaglLayer.Bounds.Size.Width), 
				(int) Math.Round (screenScale * eaglLayer.Bounds.Size.Height));

			try {
				ContextRenderingApi = EAGLRenderingAPI.OpenGLES3;

				base.CreateFrameBuffer ();

				int depthRenderbuffer;
				GL.GenRenderbuffers (1, out depthRenderbuffer);
				GL.BindRenderbuffer (RenderbufferTarget.Renderbuffer, depthRenderbuffer);
				GL.RenderbufferStorage (RenderbufferTarget.Renderbuffer, RenderbufferInternalFormat.DepthComponent16, (int)size.Width, (int)size.Height);
				GL.FramebufferRenderbuffer (FramebufferTarget.Framebuffer, FramebufferSlot.DepthAttachment, RenderbufferTarget.Renderbuffer, depthRenderbuffer);

				Console.WriteLine ("using ES 3.0");
				Console.WriteLine ("version: {0} glsl version: {1}", GL.GetString (StringName.Version), GL.GetString (StringName.ShadingLanguageVersion));
			} catch (Exception e) {
				throw new Exception ("Looks like OpenGL ES 3.0 not available", e);
			}

			cube.Initialize ();
			cube.LoadTexture (LoadBitmapData);
			SetupProjection ();
		}

        private static void GetFontSize(UILabel label, CGSize size, int maxFontSize, int minFontSize)
        {
            label.Frame = new CGRect(CGPoint.Empty, size);
              var fontSize = maxFontSize;
              var constraintSize = new CGSize(label.Frame.Width, nfloat.MaxValue);
              while (fontSize > minFontSize)
              {
            label.Font = UIFont.FromName(label.Font.Name, fontSize);
            using (var nativeString = new NSString(label.Text))
            {
              var textRect = nativeString.GetBoundingRect(
            constraintSize,
            NSStringDrawingOptions.UsesFontLeading,
            new UIStringAttributes { Font = label.Font},
            null
              );

              if (textRect.Size.Height <= label.Frame.Height)
              {
            break;
              }
            }

            fontSize -= 2;
              }
        }

		public override void ViewDidLoad ()
		{
			base.ViewDidLoad ();

			// set the background color of the view to white
			View.BackgroundColor = UIColor.White;

			// instantiate a new image view that takes up the whole screen and add it to
			// the view hierarchy
			CGRect imageViewFrame = new CGRect (0, -NavigationController.NavigationBar.Frame.Height, View.Frame.Width, View.Frame.Height);
			imageView = new UIImageView (imageViewFrame);
			View.AddSubview (imageView);

			// create our offscreen bitmap context
			// size
			CGSize bitmapSize = new CGSize (View.Frame.Size);
			using (CGBitmapContext context = new CGBitmapContext (IntPtr.Zero,
									      (int)bitmapSize.Width, (int)bitmapSize.Height, 8,
									      (int)(4 * bitmapSize.Width), CGColorSpace.CreateDeviceRGB (),
									      CGImageAlphaInfo.PremultipliedFirst)) {

				// declare vars
				UIImage apressImage = UIImage.FromFile ("icon-114.png");
				CGPoint imageOrigin = new CGPoint ((imageView.Frame.Width / 2) - (apressImage.CGImage.Width / 2), (imageView.Frame.Height / 2) - (apressImage.CGImage.Height / 2));
				CGRect imageRect = new CGRect (imageOrigin.X, imageOrigin.Y, apressImage.CGImage.Width, apressImage.CGImage.Height);

				// draw the image
				context.DrawImage (imageRect, apressImage.CGImage);

				// output the drawing to the view
				imageView.Image = UIImage.FromImage (context.ToImage ());
			}
		}

		public SignatureController ()
			: base(new UINavigationController())
		{
			var navController = ContentViewController as UINavigationController;
			navController.ViewControllers = new UIViewController[] { new ContentController(this) };
			PopoverContentSize = new CGSize(665, 400);
		}

        public static UIImage ImageFromFont(string text, UIColor iconColor, CGSize iconSize, string fontName)
        {
            UIGraphics.BeginImageContextWithOptions(iconSize, false, 0);

              var textRect = new CGRect(CGPoint.Empty, iconSize);
              var path = UIBezierPath.FromRect(textRect);
              UIColor.Clear.SetFill();
              path.Fill();

              var font = UIFont.FromName(fontName, iconSize.Width);
              using (var label = new UILabel() { Text = text, Font = font })
              {
            GetFontSize(label, iconSize, 500, 5);
            font = label.Font;
              }
              iconColor.SetFill();
              using (var nativeString = new NSString(text))
              {
            nativeString.DrawString(textRect, new UIStringAttributes
              {
            Font = font,
            ForegroundColor = iconColor,
            BackgroundColor = UIColor.Clear,
            ParagraphStyle = new NSMutableParagraphStyle
            {
              Alignment = UITextAlignment.Center
            }
              });
              }
              var image = UIGraphics.GetImageFromCurrentImageContext();
              UIGraphics.EndImageContext();
              image = image.ImageWithRenderingMode (UIImageRenderingMode.AlwaysOriginal);
              return image;
        }

        public override void ViewWillAppear(bool animated)
        {
            base.ViewWillAppear(animated);
            CGSize sz = Image.Size;
            if (UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Phone) {
                if (UIDevice.CurrentDevice.Orientation == UIDeviceOrientation.Portrait || UIDevice.CurrentDevice.Orientation == UIDeviceOrientation.PortraitUpsideDown) {
                    sz = new CGSize(UIScreen.MainScreen.Bounds.Width, UIScreen.MainScreen.Bounds.Width * (sz.Height/sz.Width));
                }
                else {
                    sz = new CGSize((UIScreen.MainScreen.Bounds.Height-NavigationController.NavigationBar.Bounds.Height)  * (sz.Width/sz.Height), UIScreen.MainScreen.Bounds.Height-NavigationController.NavigationBar.Bounds.Height);
                }
            }
            else {
                if (sz.Width > sz.Height) {
                    sz = new CGSize(PopoverSize.Height * (sz.Width/sz.Height), PopoverSize.Height);
                }
                else {
                    sz = new CGSize(PopoverSize.Width, PopoverSize.Width * (sz.Height/sz.Width));
                }
            }

            imageView.Frame = new CGRect(0, 0, sz.Width, sz.Height);
            imageView.Image = Image;

            scrollView.ContentSize = sz;
            scrollView.MinimumZoomScale = 0.25f;
            scrollView.MaximumZoomScale = 5f;

            scrollView.ViewForZoomingInScrollView += (UIScrollView sv) => {return imageView;};

            if (UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Pad) {
                scrollView.ScrollRectToVisible(new CGRect(Image.Size.Width/2 - 300, Image.Size.Height/2 - 300, 600,  600), true);
            }
        }

        public void ViewWillTransitionToSize(CGSize toSize, IUIViewControllerTransitionCoordinator coordinator)
        {
            // This API sometime cannot return the correct value.
            // Maybe this is the Xamarin or iOS bug
            // https://bugzilla.xamarin.com/show_bug.cgi?id=37064
            var menu = _basePage.SlideMenu;
            double NavigationBarHeight = 0;
            // this is used for rotation
            double bigValue = UIScreen.MainScreen.Bounds.Height > UIScreen.MainScreen.Bounds.Width ? UIScreen.MainScreen.Bounds.Height : UIScreen.MainScreen.Bounds.Width;
            double smallValue = UIScreen.MainScreen.Bounds.Height < UIScreen.MainScreen.Bounds.Width ? UIScreen.MainScreen.Bounds.Height : UIScreen.MainScreen.Bounds.Width;
            if (toSize.Width < toSize.Height) {
                ScreenSizeHelper.ScreenHeight = bigValue;
                // this is used for mutiltasking
                ScreenSizeHelper.ScreenWidth = toSize.Width < smallValue ? toSize.Width : smallValue;
                NavigationBarHeight = bigValue - toSize.Height;
            } else {
                ScreenSizeHelper.ScreenHeight = smallValue;
                ScreenSizeHelper.ScreenWidth = toSize.Width < bigValue ? toSize.Width : bigValue;
                NavigationBarHeight = smallValue - toSize.Height;
            }
            if (_dragGesture == null)
                return;

            menu.PageBottomOffset = NavigationBarHeight;

            _dragGesture.UpdateLayoutSize (menu);
            var rect = _dragGesture.GetHidePosition ();
            menu.Layout (new Xamarin.Forms.Rectangle (
                rect.left,
                rect.top,
                (rect.right - rect.left),
                (rect.bottom - rect.top)));
            _dragGesture.LayoutHideStatus ();
        }

		public override CGSize GetSizeForChildContentContainer (IUIContentContainer contentContainer, CGSize parentContainerSize)
		{
			if (UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Phone)
				return parentContainerSize;
			else
				return new CGSize(parentContainerSize.Width / 3, parentContainerSize.Height);
		}

		private static CGSize RCTTargetSize(CGSize sourceSize, nfloat sourceScale,
			CGSize destSize, nfloat destScale,
			RCTResizeMode resizeMode,
			bool allowUpscaling)
		{
			switch (resizeMode)
			{
				case RCTResizeMode.ScaleToFill:

					if (!allowUpscaling)
					{
						nfloat scale = sourceScale / destScale;
						destSize.Width = (nfloat)Math.Min(sourceSize.Width * scale, destSize.Width);
						destSize.Height = (nfloat)Math.Min(sourceSize.Height * scale, destSize.Height);
					}
					return RCTCeilSize(destSize, destScale);

				default: {

						// Get target size
						CGSize size = RCTTargetRect(sourceSize, destSize, destScale, resizeMode).Size;
						if (!allowUpscaling)
						{
							// return sourceSize if target size is larger
							if (sourceSize.Width * sourceScale < size.Width * destScale)
							{
								return sourceSize;
							}
						}
						return size;
					}
			}
		}

		public InGameScene (CGSize size) : base (size)
		{
			BackgroundColor = AppKit.NSColor.FromCalibratedRgba (0.15f, 0.15f, 0.3f, 1f);

			timeLabel = LabelWithText ("Time", 24);
			AddChild (timeLabel);

			CGRect af = timeLabel.CalculateAccumulatedFrame ();
			timeLabel.Position = new CGPoint (Frame.Size.Width - af.Size.Width, Frame.Size.Height - (af.Size.Height));

			timeLabelValue = LabelWithText ("102:00", 20);
			AddChild (timeLabelValue);
			CGRect timeLabelValueSize = timeLabelValue.CalculateAccumulatedFrame ();
			timeLabelValue.Position = new CGPoint (Frame.Size.Width - af.Size.Width - timeLabelValueSize.Size.Width - 10, Frame.Size.Height - af.Size.Height);

			scoreLabel = LabelWithText ("Score", 24);
			AddChild (scoreLabel);
			af = scoreLabel.CalculateAccumulatedFrame ();
			scoreLabel.Position = new CGPoint (af.Size.Width * 0.5f, Frame.Size.Height - af.Size.Height);

			scoreLabelValue = LabelWithText ("0", 24);
			AddChild (scoreLabelValue);
			scoreLabelValue.Position = new CGPoint (af.Size.Width * 0.75f + (timeLabelValueSize.Size.Width), Frame.Size.Height - af.Size.Height);

			// Add drop shadows to each label above.
			timeLabelValueShadow = DropShadowOnLabel (timeLabelValue);
			timeLabelShadow = DropShadowOnLabel (timeLabel);

			scoreLabelShadow = DropShadowOnLabel (scoreLabel);
			scoreLabelValueShadow = DropShadowOnLabel (scoreLabelValue);
		}

        private UIImage CreatePieSegment(CGSize size, nfloat endAngle)
        {
            // Add the arc
            var arc = new CGPath();

            arc.MoveToPoint(size.Width / 2.0f, size.Height / 2.0f);
            arc.AddLineToPoint(size.Width / 2.0f, 0);
            arc.AddArc(size.Width / 2.0f, size.Height / 2.0f, size.Width / 2.0f, _startAngle, endAngle, false);
            arc.AddLineToPoint(size.Width / 2.0f, size.Height / 2.0f);

            // Stroke the arc
            UIGraphics.BeginImageContextWithOptions(size, false, 0);

            var context = UIGraphics.GetCurrentContext();

            context.AddPath(arc);
            context.SetFillColor(UIColor.FromRGBA(0f, 0f, 0f, 1f).CGColor);
            context.FillPath();

            // Get the mask image
            var image = UIGraphics.GetImageFromCurrentImageContext();

            UIGraphics.EndImageContext();

            return image;
        }

		public override void ViewDidLoad ()
		{
			base.ViewDidLoad ();
			ClearsSelectionOnViewWillAppear = false;
			ContentSizeForViewInPopover = new CGSize (320, 600);
			TableView.Source = new TableSource ();
		}

 protected override CGSize NativeMeasureOverride(CGSize availableSize)
 {
     var size = base.NativeMeasureOverride(availableSize);
     size.Height = MathF.Max(size.Height, DefaultSize + this.Margin.VerticalThicknessF());
     size.Width = MathF.Max(size.Width, DefaultSize + this.Margin.HorizontalThicknessF());
     return size;
 }

        public override void DidFinishLaunching(NSNotification notification)
        {
            // Start the progress indicator animation.
            loadingProgressIndicator.StartAnimation (this);

            gameLogo.Image = new NSImage (NSBundle.MainBundle.PathForResource ("logo", "png"));
            archerButton.Image = new NSImage (NSBundle.MainBundle.PathForResource ("button_archer", "png"));
            warriorButton.Image = new NSImage (NSBundle.MainBundle.PathForResource ("button_warrior", "png"));

            // The size for the primary scene - 1024x768 is good for OS X and iOS.
            var size = new CGSize (1024, 768);
            // Load the shared assets of the scene before we initialize and load it.
            scene = new AdventureScene (size);

            scene.LoadSceneAssetsWithCompletionHandler (() => {
                scene.Initialize ();
                scene.ScaleMode = SKSceneScaleMode.AspectFill;

                SKView.PresentScene (scene);

                loadingProgressIndicator.StopAnimation (this);
                loadingProgressIndicator.Hidden = true;

                NSAnimationContext.CurrentContext.Duration = 2.0f;
                ((NSButton)archerButton.Animator).AlphaValue = 1.0f;
                ((NSButton)warriorButton.Animator).AlphaValue = 1.0f;

                scene.ConfigureGameControllers();
            });

            SKView.ShowsFPS = true;
            SKView.ShowsDrawCount = true;
            SKView.ShowsNodeCount = true;
        }