NGraphicsExtensions

NGraphicsExtensions.cs

using System;
using System.IO;
using UIKit;

namespace NGraphics
{
	public static class NGraphicsExtensions
	{
		static readonly IPlatform Platform = new ApplePlatform();
		static readonly double Scale = (double) UIScreen.MainScreen.Scale;

		public static void LoadSvg(this UIImageView imageView, string svg)
		{
			var s = imageView.Bounds.Size;
			LoadSvg(imageView, svg, new Size(s.Width, s.Height));
		}

		public static void LoadSvgFromResource(this UIImageView imageView, string resourceName,UIImageRenderingMode renderingMode = UIImageRenderingMode.Automatic)
		{
			var s = imageView.Bounds.Size;
			var fileName = System.IO.Path.GetFileNameWithoutExtension(resourceName);
			using (var stream = new StreamReader(ResourceLoader.GetEmbeddedResourceStream(resourceName))) {
				var image = LoadImageFromSvg(fileName, stream, new Size(s.Width, s.Height), renderingMode);
				imageView.Image = image;
			}

		}

		public static void LoadSvg(this UIImageView imageView, string svg, Size size,
			UIImageRenderingMode renderingMode = UIImageRenderingMode.Automatic)
		{
			var image = svg.LoadImageFromSvg(size, renderingMode);
			imageView.Image = image;
		}

		public static UIImage LoadImageFromSvg(this string svg, Size size,
			UIImageRenderingMode renderingMode = UIImageRenderingMode.Automatic)
		{
			var fileName = System.IO.Path.GetFileNameWithoutExtension(svg);
			using (var file = File.OpenText(svg))
			{
				return LoadImageFromSvg(fileName, file, size, renderingMode);
			}
		}

		public static UIImage LoadImageFromSvg(string fileName, TextReader file, Size size,
			UIImageRenderingMode renderingMode = UIImageRenderingMode.Automatic)
		{
			try
			{
				var graphic = Graphic.LoadSvg(file);
				//Shame on Size not being Equatable ;)
				if (size.Width <= 0 || size.Height <= 0)
					size = graphic.Size;
				var gSize = graphic.Size;
				if (gSize.Width > size.Width || size.Height > gSize.Height)
				{
					var ratioX = size.Width/gSize.Width;
					var ratioY = size.Height/gSize.Height;
					var ratio = Math.Min(ratioY, ratioX);
					graphic.Size = size = new Size(gSize.Width*ratio, gSize.Height*ratio);
				}
				var c = Platform.CreateImageCanvas(size, Scale);
				graphic.Draw(c);
				var image = c.GetImage().GetUIImage();
				if (renderingMode != UIImageRenderingMode.Automatic)
					image = image.ImageWithRenderingMode(renderingMode);
				image.AccessibilityIdentifier = fileName;
				return image;
			}
			catch (Exception ex)
			{
				Console.WriteLine(ex);
				Console.WriteLine("Failed parsing: {0}", fileName);
//				throw;
				return null;
			}
		}
	}
}