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Render Method

Summary
Renders this SvgDocument to an output engine.
Syntax
C#
C++/CLI
Java
Python
public void render(IRenderingEngine engine, SvgRenderOptions options) 
def Render(self,options): 

Parameters

engine
Rendering engine to use for the target device. Cannot be null.

options
Options to use during rendering. Can be null.

Remarks

For more information, refer to SVG Rendering.

Use Rasterize to render this SVG document into the surface of a LEADTOOLS Leadtools.RasterImage object.

This method will throw an exception if this document is not flat (the value of IsFlat is false) or if it does not have valid physical (pixel) bounds (the value of Bounds.IsValid is false).

If the value of  options is null, then the following default options will be used:

Member Value
SvgRenderOptions.Bounds

The current physical bounds of document (Bounds.Bounds)

SvgRenderOptions.ClipBounds

Empty rectangle for rendering the document

SvgRenderOptions.Transform

Identity Leadtools.LeadMatrix

SvgRenderOptions.UseBackgroundColor

true

BackgroundColor

White color

Example

This example will convert a page from a PDF file to SVG format and render it on a form.

C#
Java
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using Leadtools.Forms.DocumentWriters; 
using Leadtools.Svg; 
 
using Leadtools.Document.Writer; 
 
public void SvgDocumentRenderExample() 
{ 
   // Create a form with a picture box 
   Form form = new Form(); 
   PictureBox pictureBox = new PictureBox(); 
   pictureBox.Dock = DockStyle.Fill; 
   form.Controls.Add(pictureBox); 
 
   SvgDocument document = null; 
 
   // Load a page from a document file as SVG 
   string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Leadtools.pdf"); 
   using (var codecs = new RasterCodecs()) 
   { 
      // Set 300 as the default value for loading document files 
      codecs.Options.RasterizeDocument.Load.Resolution = 300; 
 
      document = codecs.LoadSvg(srcFileName, 1, null) as SvgDocument; 
   } 
 
   // Make sure the document is valid for rendering 
   if (!document.IsFlat) 
      document.Flat(null); 
   if (!document.Bounds.IsValid) 
      document.CalculateBounds(false); 
 
   // Optimize it for rendering to increase the speed 
   document.BeginRenderOptimize(); 
   Console.WriteLine("IsRenderOptimized is " + document.IsRenderOptimized); 
 
   // This is our paint code 
   pictureBox.Paint += (sender, e) => 
   { 
      Graphics graphics = e.Graphics; 
 
      // We will fit and center this SVG document in the client area of the picture box 
      Rectangle dstBounds = pictureBox.ClientRectangle; 
      if (dstBounds.Width < 1 || dstBounds.Height < 1) 
         return; 
 
      // Create the transformation matrix 
      LeadMatrix transform = LeadMatrix.Identity; 
      LeadRectD srcBounds = document.Bounds.Bounds; 
 
      // Calculate the zoom so we can fit 
      double zoom = 1.0; 
      if (dstBounds.Width > dstBounds.Height) 
      { 
         zoom = dstBounds.Width / srcBounds.Width; 
         if ((zoom * srcBounds.Height) > dstBounds.Height) 
            zoom = dstBounds.Height / srcBounds.Height; 
      } 
      else 
      { 
         zoom = dstBounds.Height / srcBounds.Height; 
         if ((zoom * srcBounds.Width) > dstBounds.Width) 
            zoom = dstBounds.Width / srcBounds.Width; 
      } 
 
      // We have the zoom factor, set it in the transform 
      transform.Scale(zoom, zoom); 
 
      // Center 
      double xOffset = (dstBounds.Width - (zoom * srcBounds.Width)) / 2.0; 
      double yOffset = (dstBounds.Height - (zoom * srcBounds.Height)) / 2.0; 
      transform.Translate(xOffset, yOffset); 
 
      // Now setup the rendering options 
      SvgRenderOptions options = new SvgRenderOptions(); 
      // Use our transform 
      options.Transform = transform; 
      // clipping (if any) 
      options.ClipBounds = LeadRectD.Create(e.ClipRectangle.X, e.ClipRectangle.Y, e.ClipRectangle.Width, e.ClipRectangle.Height); 
      // Fill the background with a white color 
      options.UseBackgroundColor = true; 
      options.BackgroundColor = RasterColor.FromKnownColor(RasterKnownColor.White); 
      options.Bounds = srcBounds; 
 
      // Create a rendering engine 
      using (var engine = RenderingEngineFactory.Create(graphics)) 
      { 
         // Render the document 
         document.Render(engine, options); 
      } 
   }; 
 
   form.SizeChanged += (sender, e) => pictureBox.Invalidate(); 
 
   form.ShowDialog(); 
 
   document.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
} 
 
import java.io.ByteArrayInputStream; 
import java.io.ByteArrayOutputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.ObjectInputStream; 
import java.io.ObjectOutputStream; 
import java.io.PrintStream; 
import java.nio.file.FileVisitOption; 
import java.nio.file.Files; 
import java.nio.file.Path; 
import java.nio.file.Paths; 
import java.util.stream.Stream; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.document.writer.*; 
import leadtools.svg.*; 
 
 
public void svgDocumentRenderExample() { 
   // Skipped due to java ui 
} 
Requirements

Target Platforms

Help Version 23.0.2024.2.29
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© 1991-2024 LEAD Technologies, Inc. All Rights Reserved.

Leadtools.Svg Assembly

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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.