Neuerstellung

- Quelle: https://github.com/oxyplot/oxyplot

Source/OxyPlot.ImageSharp/JpegExporter.cs

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+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="JpegExporter.cs" company="OxyPlot">
+//   Copyright (c) 2014 OxyPlot contributors
+// </copyright>
+// <summary>
+//   Provides functionality to export plots to jpeg.
+// </summary>
+// --------------------------------------------------------------------------------------------------------------------
+
+namespace OxyPlot.ImageSharp
+{
+    using System.IO;
+
+    /// <summary>
+    /// Provides functionality to export plots to jpeg.
+    /// </summary>
+    public class JpegExporter : IExporter
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="JpegExporter"/> class.
+        /// </summary>
+        /// <param name="width">The width in pixels of the exported jpeg.</param>
+        /// <param name="height">The height in pixels of the exported jpeg.</param>
+        /// <param name="resolution">The resolution in dots per inch (DPI) of the exported jpeg.</param>
+        /// <param name="quality">The quality of the exported jpeg, a value between 0 and 100.</param>
+        public JpegExporter(int width, int height, double resolution = 96, int quality = 75)
+        {
+            this.Width = width;
+            this.Height = height;
+            this.Resolution = resolution;
+            this.Quality = quality;
+        }
+
+        /// <summary>
+        /// Gets or sets the width in pixels of the exported jpeg.
+        /// </summary>
+        public int Width { get; set; }
+
+        /// <summary>
+        /// Gets or sets the height in pixels of the exported jpeg.
+        /// </summary>
+        public int Height { get; set; }
+
+        /// <summary>
+        /// Gets or sets the resolution in dots per inch (DPI) of the exported jpeg.
+        /// </summary>
+        public double Resolution { get; set; }
+
+        /// <summary>
+        /// Gets or sets the quality of the exported jpeg, a value between 0 and 100.
+        /// </summary>
+        public int Quality { get; set; }
+
+        /// <summary>
+        /// Exports the specified <see cref="PlotModel" /> to the specified file.
+        /// </summary>
+        /// <param name="model">The model.</param>
+        /// <param name="fileName">The file name.</param>
+        /// <param name="width">The width.</param>
+        /// <param name="height">The height.</param>
+        /// <param name="resolution">The resolution in dpi (defaults to 96dpi).</param>
+        public static void Export(IPlotModel model, string fileName, int width, int height, double resolution = 96)
+        {
+            var exporter = new JpegExporter(width, height, resolution);
+            using (var stream = File.Create(fileName))
+            {
+                exporter.Export(model, stream);
+            }
+        }
+
+        /// <summary>
+        /// Exports the specified <see cref="PlotModel"/> to the specified <see cref="Stream"/>.
+        /// </summary>
+        /// <param name="model">The model.</param>
+        /// <param name="stream">The output stream.</param>
+        public void Export(IPlotModel model, Stream stream)
+        {
+            var background = model.Background.IsInvisible() ? OxyColors.White : model.Background;
+            using (var rc = new ImageRenderContext(this.Width, this.Height, background, this.Resolution))
+            {
+                var dpiScale = this.Resolution / 96;
+                model.Update(true);
+                model.Render(rc, new OxyRect(0, 0, this.Width / dpiScale, this.Height / dpiScale));
+                rc.SaveAsJpeg(stream, this.Quality);
+            }
+        }
+    }
+}