I extended HSLF to support custom image renderers. Here is what you need to do
to render WMF:
1. Checkout the latest trunk.
2. Download Apache Batik, http://xmlgraphics.apache.org/batik/
3. Include the Batik jar in the classpath.
4. Below is a mock up a class that can render WMF using Batik. Include it in
your project.
package org.apache.poi.hslf.blip;
import org.apache.poi.hslf.usermodel.PictureData;
import org.apache.poi.hslf.model.Picture;
import java.awt.*;
import java.io.*;
/**
* Use Apache Batik to render WMF into Graphics2D
*
* @author Yegor Kozlov
*/
public class WMFImagePainter implements ImagePainter {
public void paint(Graphics2D graphics, PictureData pict, Picture parent) {
DataInputStream is = new DataInputStream(new
ByteArrayInputStream(pict.getData()));
org.apache.batik.transcoder.wmf.tosvg.WMFRecordStore wmfStore =
new org.apache.batik.transcoder.wmf.tosvg.WMFRecordStore();
try {
wmfStore.read(is);
} catch (IOException e){
e.printStackTrace();
return;
}
Rectangle anchor = parent.getAnchor();
float scale = (float)anchor.width/wmfStore.getWidthPixels();
org.apache.batik.transcoder.wmf.tosvg.WMFPainter painter =
new org.apache.batik.transcoder.wmf.tosvg.WMFPainter(wmfStore,
0, 0, scale);
graphics.translate(anchor.x, anchor.y);
painter.paint(graphics);
}
}
I didn't research it deeply. Try to play with the Batik classes.
5. Add the following line before rendering:
PictureData.setImagePainter(Picture.WMF, new WMFImagePainter ());
6. Subsequent calls of Slide.draw(Graphics gr) will use WMFImagePainter for WMF
images and
you should see WMF in the generated images. Let me know about your results.
Regards,
Yegor
Thank you, I greatly appreciate all of your time and help.
Travis
Yegor Kozlov wrote:
That sounds quite interesting, actually. Where do I start? I've checked
out the various .draw() methods. I am not sure what shape.draw() is
doing though, it appears to just be calling the log() method in
POILogger.
OK. I will find time this weekend to review the code and prepare a
"how to" for you.
Yegor
Travis
Yegor Kozlov wrote:
In ppt slides equations are embedded OLE objects. Each OLE object
consists of two parts:
- snapshot in WMF format. This is what needs to be rendered.
- the actual binary OLE data. This part is activated by double-click.
Since rendering of WMF is not supported by JDK, the equations don't
appear in the created images.
In next versions of HSLF I plan to use Batik
http://xmlgraphics.apache.org/batik/ which
includes a WMF transcoder:
http://xmlgraphics.apache.org/batik/javadoc/org/apache/batik/transcoder/wmf/tosvg/WMFPainter.html
If you feel like researching this subject, I can explain how to
extend HSLF code to use third-party image renderers.
Yegor
Is there a similar situation with equations made using the equation
editor? I have a presentation where many of the slides have
equation object in them that do not appear in the images created
from slide.draw().
Thanks,
Travis
Yegor Kozlov wrote:
This kind of background is not yet supported. In particular, HSLF
does not support gradient fills and texture fills. I will see if I
can
include this support in poi-3.1-final.
Yegor
I am having an issue with the powerpoint at
http://cs.unm.edu/~massless/test3.ppt . When I dump all the
slides to image files (png or jpg) there is no background for any
of the slides except the first and last. Is there something extra
I need to do to get
slide.draw() to render these slides?
Thanks
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