Rob,
Maybe, you'll need to be "headless"
-Djava.awt.headless=true
Yegor has been through this pain. I suggest you try the following
experiment.
Create an Excel document with an image in the size you want on Windows.
Open the same file on the Mac. Its aspect ratio will be squashed like
a standard TV expanded onto HDTV. There are all types of effects the
most important being the size of the default font in the Excel
Application which is NOT a document setting.
Play with WIndows dpi and see things change.
FYI there is an even sicker trouble with sizing Escher font characters
within a drawing. Scaling can lead to results you don't expect.
Microsoft in its wisdom only supports font characters in discrete
pixel sizes in Excel. Scaling is rounded. And then layout is wrong on
the Mac due to aspect ratio.
Powerpoint also gives goofy effects with device independent and
dependent display that differs between Mac and Windows and Excel.
Yes, I wish resize was better, you are free to try. That said I've had
Yegor spend time on these issues several times over the past few years.
Regards,
Dave
On Nov 11, 2008, at 3:28 PM, Rob Y wrote:
HSSFPicture.resize() uses an internal getImageDimension() method,
which uses
various objects from javax.imageio and java.awt.image. When I call
this
method from my AIX C app (via a JNI wrapper), it works. But to
debug my
wrapper, I run it under Eclipse on Windows. When I call
getImageDimension
there, it throws an AritmeticException at the size.width calculation
below:
int[] dpi = getResolution(r);
size.width = img.getWidth()*96/dpi[0];
it turns out that dpi comes back from getResolution as 0, so you get a
divide-by-zero exception. Is there a problem using javax.imageio or
java.awt.image under eclipse? I know eclipse doesn't use AWT
normally, but
I'm not getting an 'unable to locate class' type of error.
Thanks,
Rob
Here's the whole method:
public Dimension getImageDimension(){
EscherBSERecord bse =
patriarch.sheet.book.getBSERecord(pictureIndex);
byte[] data = bse.getBlipRecord().getPicturedata();
int type = bse.getBlipTypeWin32();
Dimension size = new Dimension();
switch (type){
//we can calculate the preferred size only for JPEG and PNG
//other formats like WMF, EMF and PICT are not supported
in Java
case HSSFWorkbook.PICTURE_TYPE_JPEG:
case HSSFWorkbook.PICTURE_TYPE_PNG:
case HSSFWorkbook.PICTURE_TYPE_DIB:
try {
//read the image using javax.imageio.*
ImageInputStream iis =
ImageIO.createImageInputStream(
new ByteArrayInputStream(data) );
Iterator i = ImageIO.getImageReaders( iis );
ImageReader r = (ImageReader) i.next();
r.setInput( iis );
BufferedImage img = r.read(0);
int[] dpi = getResolution(r);
size.width = img.getWidth()*96/dpi[0];
size.height = img.getHeight()*96/dpi[1];
} catch (IOException e){
//silently return if ImageIO failed to read the
image
log.log(POILogger.WARN, e);
}
break;
}
return size;
}
--
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