85 lines
3.3 KiB
C#
85 lines
3.3 KiB
C#
// --------------------------------------------------------------------------------------------------------------------
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// <copyright file="PngExporter.cs" company="OxyPlot">
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// Copyright (c) 2020 OxyPlot contributors
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// </copyright>
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// --------------------------------------------------------------------------------------------------------------------
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namespace OxyPlot.SkiaSharp
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{
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using global::SkiaSharp;
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using System.IO;
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/// <summary>
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/// Provides functionality to export plots to png using the SkiaSharp renderer.
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/// </summary>
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public class PngExporter : IExporter
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{
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/// <summary>
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/// Gets or sets the DPI.
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/// </summary>
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public float Dpi { get; set; } = 96;
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/// <summary>
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/// Gets or sets the export height (in pixels).
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/// </summary>
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public int Height { get; set; }
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/// <summary>
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/// Gets or sets the export width (in pixels).
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/// </summary>
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public int Width { get; set; }
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/// <summary>
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/// Gets or sets a value indicating whether text shaping should be used when rendering text.
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/// </summary>
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public bool UseTextShaping { get; set; } = true;
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/// <summary>
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/// Exports the specified model to a file.
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/// </summary>
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/// <param name="model">The model.</param>
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/// <param name="path">The path.</param>
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/// <param name="width">The width (points).</param>
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/// <param name="height">The height (points).</param>
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/// <param name="dpi">The DPI (dots per inch).</param>
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public static void Export(IPlotModel model, string path, int width, int height, float dpi = 96)
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{
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using var stream = File.OpenWrite(path);
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Export(model, stream, width, height, dpi);
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}
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/// <summary>
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/// Exports the specified model to a stream.
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/// </summary>
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/// <param name="model">The model.</param>
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/// <param name="stream">The output stream.</param>
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/// <param name="width">The width (points).</param>
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/// <param name="height">The height (points).</param>
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/// <param name="dpi">The DPI (dots per inch).</param>
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public static void Export(IPlotModel model, Stream stream, int width, int height, float dpi = 96)
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{
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var exporter = new PngExporter { Width = width, Height = height, Dpi = dpi };
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exporter.Export(model, stream);
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}
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/// <inheritdoc/>
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public void Export(IPlotModel model, Stream stream)
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{
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using var bitmap = new SKBitmap(this.Width, this.Height);
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using (var canvas = new SKCanvas(bitmap))
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using (var context = new SkiaRenderContext { RenderTarget = RenderTarget.PixelGraphic, SkCanvas = canvas, UseTextShaping = this.UseTextShaping })
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{
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var dpiScale = this.Dpi / 96;
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context.DpiScale = dpiScale;
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model.Update(true);
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canvas.Clear(model.Background.ToSKColor());
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model.Render(context, new OxyRect(0, 0, this.Width / dpiScale, this.Height / dpiScale));
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}
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using var skStream = new SKManagedWStream(stream);
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bitmap.Encode(skStream, SKEncodedImageFormat.Png, 0);
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}
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}
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}
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