Re: Help with writing to a BufferedImage

From:

"Steve W. Jackson" <stevewjackson@charter.net>

Newsgroups:

comp.lang.java.gui

Date:

Thu, 11 May 2006 15:00:46 -0500

Message-ID:

<stevewjackson-698A73.15004611052006@individual.net>

In article <ytM8g.6729$kW2.28924@wagner.videotron.net>,
"Casper B." <casper@jbr.dk> wrote:

I have a method which will create a buffered image with a diagonal line
across. For some reason I can not specify the color of this line (nor
the background) but I will end up with a black and white image.

--- cut ---

     public Image buildDiagonalImage(Rectangle2D rect)
     {
    int width = (int)rect.getWidth();
    int height = (int)rect.getHeight();

    // Create buffered image that does not support transparency
    BufferedImage bimage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);

    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice gs = ge.getDefaultScreenDevice();
    GraphicsConfiguration gc = gs.getDefaultConfiguration();

    // Create an image that does not support transparency
    bimage = gc.createCompatibleImage(width, height, Transparency.OPAQUE);

    bimage.getGraphics().setColor(Color.BLUE); // <-- Has no effect
    bimage.getGraphics().drawLine(0,0,width, height);

    return bimage;
     }

--- cut ---

Can anyone spot what I am doing wrong? It would be much appreciated.

Casper

I don't see much reason to create a BufferedImage and then turn right
around and have your GraphicsConfiguration provide one to you. Seems a
little wasteful, to me.

But as to the source of the trouble, I might suggest not using
getGraphics there. Instead, call createGraphics and capture the
Graphics2D it returns. Then call setColor and drawLine on it.

Of course, that all assumes that the image itself isn't somehow being
obliterated elsewhere in your code, since this code is clearly not a
standalone example.

= Steve =
--
Steve W. Jackson
Montgomery, Alabama