Rendering to Graphics2D with Transformations

Aspose.Metafiles allows not only create default RenderedImage but also play metafile directly to the standard Graphics2D context and as a result possibility to set necessary RenderingHints . In this topic, we will show example how to render metafile without antialiasing and with custom scale factor.

Custom Metafiles Rendering

We use standard Metafile Companion Test Chart as source.

Figure : Source Metafile

In this example we will do next steps:

Open source wmf metafile.

Create BufferedImage with size equal to the 50% of the real metafile size.

Obtain reference to the Graphics2D object for created BufferedImage.

Play our metafile to the obtained Graphics2D and scale it to get half-size image.

Example:

Java

 try
 {
    // Instantiate a EmfMetafile/WmfMetafile object that represents a metafile
    WmfMetafile wmf = new WmfMetafile(new FileInputStream(new File("MFCompanion.wmf")));


    // Creating BufferedImage
    BufferedImage bimage = new BufferedImage(
          (int)(wmf.getWidth() / 2.0 + 0.5),
          (int)(wmf.getHeight() / 2.0 + 0.5),
          BufferedImage.TYPE_3BYTE_BGR);


    // Obtaining reference to the Graphics2D object
    Graphics2D graphics = bimage.createGraphics();


    // Turn on antialiasing for this Graphics2D
    Map map = new HashMap();
    map.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    map.put(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
    graphics.addRenderingHints(map);


    // Fill image background with White color
    graphics.setPaint(Color.WHITE);
    graphics.fill(new Rectangle(0, 0, bimage.getWidth(), bimage.getHeight()));


    // Add scale transformation
    AffineTransform trans = AffineTransform.getScaleInstance(0.5, 0.5);
    graphics.setTransform(trans);


    // Play metafile to the Graphics2D
    wmf.playMetafile(graphics);


    // Save created image as png file
    FileOutputStream stream = new FileOutputStream("MFCompanion.png");
    PNGEncodeParam param = PNGEncodeParam.getDefaultEncodeParam(bimage);
    ImageEncoder enc = ImageCodec.createImageEncoder("PNG", stream, param);
    enc.encode(bimage);
    stream.close();
 }
 catch(Exception ex)
 {
    System.out.println(ex.toString());
 }

After executing this code example we should get this image:

Figure : Created PNG image

Rendering to Graphics2D with Transformations

Custom Metafiles Rendering

Example:

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