Neuerstellung

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

Source/OxyPlot.WindowsForms/PngExporter.cs

@@ -0,0 +1,109 @@
+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="PngExporter.cs" company="OxyPlot">
+//   Copyright (c) 2014 OxyPlot contributors
+// </copyright>
+// <summary>
+//   Provides functionality to export plots to png.
+// </summary>
+// --------------------------------------------------------------------------------------------------------------------
+
+#if OXYPLOT_COREDRAWING
+namespace OxyPlot.Core.Drawing
+#else
+namespace OxyPlot.WindowsForms
+#endif
+{
+    using System.Drawing;
+    using System.Drawing.Imaging;
+    using System.IO;
+
+    /// <summary>
+    /// Provides functionality to export plots to png.
+    /// </summary>
+    public class PngExporter : IExporter
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PngExporter" /> class.
+        /// </summary>
+        public PngExporter()
+        {
+            this.Width = 700;
+            this.Height = 400;
+            this.Resolution = 96;
+        }
+
+        /// <summary>
+        /// Gets or sets the width of the output image.
+        /// </summary>
+        public int Width { get; set; }
+
+        /// <summary>
+        /// Gets or sets the height of the output image.
+        /// </summary>
+        public int Height { get; set; }
+
+        /// <summary>
+        /// Gets or sets the resolution (dpi) of the output image.
+        /// </summary>
+        public double Resolution { get; set; }
+
+        /// <summary>
+        /// Exports the specified model.
+        /// </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.</param>
+        public static void Export(IPlotModel model, string fileName, int width, int height, double resolution = 96)
+        {
+            var exporter = new PngExporter { Width = width, Height = height, Resolution = 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)
+        {
+            using (var bm = this.ExportToBitmap(model))
+            {
+                bm.Save(stream, ImageFormat.Png);
+            }
+        }
+        
+        /// <summary>
+        /// Exports the specified <see cref="PlotModel" /> to a <see cref="Bitmap" />.
+        /// </summary>
+        /// <param name="model">The model to export.</param>
+        /// <returns>A bitmap.</returns>
+        public Bitmap ExportToBitmap(IPlotModel model)
+        {
+            var bm = new Bitmap(this.Width, this.Height);
+            using (var g = Graphics.FromImage(bm))
+            {
+                if (model.Background.IsVisible())
+                {
+                    using (var brush = model.Background.ToBrush())
+                    {
+                        g.FillRectangle(brush, 0, 0, this.Width, this.Height);
+                    }
+                }
+
+                using (var rc = new GraphicsRenderContext(g) { RendersToScreen = false })
+                {
+                    model.Update(true);
+                    model.Render(rc, new OxyRect(0, 0, this.Width, this.Height));
+                }
+
+                bm.SetResolution((float)this.Resolution, (float)this.Resolution);
+                return bm;
+            }
+        }
+    }
+}