hi ben,
> Firstly is there a user forum for the project I can direct my queries
> to?
currently, there is only the dev list to post questions.
> Secondly, I would like to know if Sanselan is at the point where a tEXt
> chunk can be inserted into a PNG image. If so, how is this done? I have
> been using v0.94 but I can't make it do what I need.
with sanselan you are able to get a BufferedImage:
File file = someFile;
BufferedImage image = Sanselan.getBufferedImage(file);
you can than modify the BufferedImage by using Java2D:
Graphics2D g2 = image.createGraphics();
g2.setColor(Color.black);
g2.setFont(font);
g2.drawString(text, 80,1440);
and save the image with sanselan:
OutputStream os = someOutputStream;
Sanselan.writeImage(image, os, format, optional_params);
see http://incubator.apache.org/sanselan/site/sampleusage.html for more samples.
hope this helps.
regards,
philipp
On Mon, Aug 4, 2008 at 5:06 PM, <[EMAIL PROTECTED]> wrote:
> Hi,
>
>
>
> I have a couple of questions regarding Sanselan.
>
>
>
> Firstly is there a user forum for the project I can direct my queries
> to?
>
>
>
> Secondly, I would like to know if Sanselan is at the point where a tEXt
> chunk can be inserted into a PNG image. If so, how is this done? I have
> been using v0.94 but I can't make it do what I need.
>
>
>
> I wish to embed an XML String containing meta data describing the image
> file. I have written the function below. I think I have generated the
> PNGChunktEXt correctly but without seeing an example I am not sure. If
> it is correct, I still I don't know how to get it into the byte array
> holding the png image.
>
>
>
> I would appreciate any advice you could give.
>
>
>
> static public byte [] changePngMetadata(byte [] pngImage,
> String xmlString) throws ImageReadException, IOException
>
> {
>
>
>
> String txtString = "TcsMetaData" + '\0' +
> xmlString;
>
>
>
> PngCrc pngCrc = new PngCrc();
>
> int iCRC = pngCrc.crc(txtString.getBytes(),
> txtString.length());
>
>
>
> //May want to use compressed text instead. Do I
> need to compress the text string separately?
>
> PNGChunktEXt txt = new
> PNGChunktEXt(txtString.length(), PngConstants.tEXt, iCRC,
> txtString.getBytes());
>
>
>
> String kw = txt.getKeyword();
>
> String tx = txt.getText();
>
>
>
> //How do I insert txt into pngImage?
>
>
>
> return pngImage;
>
> }
>
>
>
> Regards,
>
>
>
> Ben
>
>
>
>
>
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