hi,
you have to use the image observer to know if the image has been completed.
since you are giving null, the function will return immediately before the
image is drawn completly. It is something like the ActionListener class where
the listener will be called periodically when an even occurs. you just have
to check if the required event is fired, then set a flag and check this flag
in an infinite loop.
hth,
Nagarajan.
On Wednesday 13 March 2002 18:54, you wrote:
> Dear All,
>
> I am currently trying to develop a servlet which produces a GIF file, it
> uses Jimi to get an Image file from an existing GIF file, from here
> ideally
> a Graphics Object should be created, several Ovals based on arguments
> should
> be created and the image outputted to the GIF.
>
> Using existing source code I manage to create the servlet which draws
> Ovals,
> the problem I am having is getting the Jimi Image to the Graphics
> Object, as
> it appears not to have time to load before the Graphics Object is
> created. I
> know that if you are using Applets you can use a MediaTracker to wait
> for an
> Image to load, but as I am not using an Applet I cannot find a way for
> the
> Image to load properly. If anyone knows a way to solve this problem, I
> would
> be most grateful. Perhaps my approach is wrong?
>
> I have included a slice of code to show my problem..
>
> Regards,
> Peter Dolukhanov
>
> ---
>
> public void paint(Graphics graphics, HttpServletRequest request)
> {
>
> Image image = Jimi.getImage("bigmap.gif", Jimi.VIRTUAL_MEMORY);
>
> Color transparent = ServletTools.getColorParameter(request,
> "transparent", Color.magenta);
> Color background = ServletTools.getColorParameter(request,
> "background", Color.yellow);
> Color foreground = ServletTools.getColorParameter(request,
> "foreground", Color.black);
>
> // Get the requested image size
> Dimension imageSize = getImageSize(request);
>
> // Set the transparent color to magenta
> setTransparentColor(transparent);
>
> // Draw our pretty picture :-)
>
> graphics.setColor(transparent);
>
> graphics.drawImage(image, 0, 0, null); // I don't know what to
> do
> with the null value here as it needs an ImageObserver
>
> graphics.fillOval(10, 20, 50, 50);
> }
>
> This extends a GifServlet class which creates an Image, paints on it
> using
> this method, and then outputs it.
>
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