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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