Re: Creating a gif file from a visad display (inside a servlet?)

• To: Amaral <amaral@xxxxxx>
• Subject: Re: Creating a gif file from a visad display (inside a servlet?)
• From: Ugo Taddei <p6taug@xxxxxxxxxxx>
• Date: Tue, 18 Mar 2003 09:24:07 +0100

Alo, Amaral,

Amaral wrote:

Please, I need help on the following problem. I would like to create a gif file from a visad display. I am using the code below but it does not work. Thanks for any help. Runnable captureImage = new Runnable() {

 public void run() {
 Image img = display.getImage();
 Graphics g =img.getGraphics();

g.drawImage(img, 0,0, null); try

  {
File filee = new File("file.gif");
OutputStream output = new BufferedOutputStream(new FileOutputStream(filee));
GIFEncoder encoder = new GIFEncoder(img);
encoder.Write(output);
  }
  catch (Exception w){ }
      }
    }

Thread t = new Thread(captureImage);

   t.start();

Two points:

2. To create an image inside a servlet you can do:

// get the output stream to send the image down the line
 ServletOutputStream servOutStream = response.getOutputStream();

// set the content type so the browser will be able to interpret
// the img correctly
 response.setContentType( "image/jpeg" );


// this is the image
 BufferedImage bufImage = display.getImage(true);

// make a jpg out of it
 JPEGEncodeParam jepar = JPEGCodec.getDefaultJPEGEncodeParam(bufImage);
 jepar.setQuality( 1.0f, true);

 JPEGImageEncoder jpege = JPEGCodec.createJPEGEncoder(servOutStream) ;
 jpege.encode(bufImage, jepar);

// and send it to the browser
 servOutStream.flush();
 servOutStream.close();

Cheers,

Ugo

• References:
  • Creating a gif file from a visad display
    • From: Amaral