Casting problem. Image to BufferedImage

[Luka Juric]

  RenderedImage rendImage = myCreateImage();
    // Write generated image to a file
    try {
        // Save as JPEG
        file = new File("newimage.jpg");
        ImageIO.write(rendImage, "jpg", file);
    } catch (IOException e) {
    }
    
 
    
    // Returns a generated image.
    public RenderedImage myCreateImage() {
        int width = 384;
        int height = 288;
 
        // Create a buffered image in which to draw
       BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
 
       [B]bufferedImage = (BufferedImage) image;[/B]
//Image image; jpg file that I load from web, image = getImage(url, "xxx.jpg"); 
       return bufferedImage;
    }

I get this exception -> java.lang.ClassCastException: sun.awt.image.ToolkitImage cannot be cast to java.awt.image.BufferedImage
So problem is that I have image and I want to write it on local disc as xxx.jpg file.

[Justin Fox]

if you just want to draw to the image you import...

use...

Graphics myGraphics = image.getGraphics();

then in paintComponent you can just do

myGraphics.drawString("blah",20,30);

and etc..


Justin

[Justin Fox]

if you want to write the file to local disk

just say:

File file = new File(URL url);

and it will create a file;

Justin

[Craig Wood]

Pseudo suggestion.

// jpg file that I load from web
// Create the image.
Image image = getImage(url, "xxx.jpg"); 
// Load the image.
MediaTracker mt = new MediaTracker(this);
mt.addImage(image, 0);
try {
    mt.waitForID(0);
} catch(InterruptedExceptoon e) {
    System.out.println("interrupted loading");
}
RenderedImage rendImage = myCreateImage(image);
// Write generated image to a file
try {
    // Save as JPEG
    file = new File("newimage.jpg");
    ImageIO.write(rendImage, "jpg", file);
} catch (IOException e) {
}
 
// Returns a generated image.
public RenderedImage myCreateImage(Image image) {
    int width = 384;  // or, = image.getWidth(this);
    int height = 288;
    // Create a buffered image in which to draw
    BufferedImage bufferedImage = new BufferedImage(width, height,
                                          BufferedImage.TYPE_INT_RGB);
    // Draw image into bufferedImage.
    Graphics2D g2 = bufferedImage.createGraphics();
    g2.drawImage(image, 0, 0, this);
    g2.dispose();
    return bufferedImage;
}

edit: removed erroneous comment.
[ March 09, 2007: Message edited by: Craig Wood ]

[Luka Juric]

Thanks Craig, but still doesn't work. It saves me all black picture(384,288).

I test loading picture with

public void paint(Graphics g) {
g.drawImage(image, 0, 0, this);
}

and it works ok.

I try to test drawing with adding this

g2.drawImage(image, 0, 0, this);
g2.setColor(Color.white);
g2.fillOval(0, 0, width, height);
g2.dispose();

and than it save me white circle on black background, but this line of code g2.drawImage(image, 0, 0, this); like just don't exsist.
What can I try now?

[Luka Juric]

Justin,

You didn't understand me. I need to save xxx.jpg file on my local disc, but problem is that this line of code

ImageIO.write(rendImage, "jpg", file);

works only with RendererImage, and not with Image , and I have Image.

[Luka Juric]

You write good code, it works, I make some mistake.

Thanks Craig,

Luka

[Ricky Clarkson]

Just a small note - any time you're doing casting there's something wrong with the API you're using, or you're using it wrong. The core APIs aren't immune to this (Object.equals for example - it's not possible to sensibly override that without a cast).

In other words, casting is for magicians, not programmers!