[3233] in java-interest
Re: ImageProducer/Consumer classes
daemon@ATHENA.MIT.EDU (Jim Graham)
Fri Nov 3 22:45:43 1995
Date: Fri, 3 Nov 1995 17:39:27 -0800
From: flar@bendenweyr.Eng.Sun.COM (Jim Graham)
To: java-interest@java.Eng.Sun.COM, dgourley@CS.Berkeley.EDU
Hi David,
> I understand that I can implement the producer interface which can go off
> and get the frames and then call the appropriate method in the consumer
> class notifying that a frame has arrived and is ready, the part I am not
> sure about is that once a frame has arrived the consumer must either notify
> or arrange for it to be displayed. Should it create an Image for each frame
> and then display? This seems inefficient, there must be a cleaner way to do
> this, but I just dont see it. Any help would be appreciated.
When you create an image from an ImageProducer using
Component.createImage(ImageProducer)
you get back a handle to something that will take care of managing the
ImageConsumers needed to get the bits to the screen on its own. These
ImageConsumers will also take care of notifying applets that are drawing
the image that a new frame is available using the ImageObserver notification
mechanism.
So, all you have to worry about is writing the ImageProducer and then
creating one image for it using the above method and from then on that
one image will be the way to draw each successive frame.
...jim
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