ImageJ/Java Question

[David Webster]

All,

I ran into the situation desribed below, but don't understand
Java well enough to know why what I'm doing is done this way. For
what it's worth, I suspect I could do what I want to do easier using
Stacks.

I have an array of 5 ImageProcessor objects called ip.
I want to display each object in turn using a loop. So
first I declare an array of ImagePlus objects, called im.
This is shown below. But, the array entries ar all null
at this point. So, in the in the loop I again use new and
an ImagePlus constructor to create an ImagePlus object, im[k],
My question is can this be done without using "new" twice and/or
is this correct.


ImagePlus im[] = new ImagePlus[5];
               
for(int k = 0; k < 5; k++)
{
        im[k] = new ImagePlus();

        im[k].setProcessor("name",ip[k]);
        im[k].show();
}

david Webster

[dscho]

Hi,

On Thu, 1 Oct 2009, David William Webster wrote:

> I ran into the situation desribed below, but don't understand Java well
> enough to know why what I'm doing is done this way. For what it's worth,
> I suspect I could do what I want to do easier using Stacks.
>
> I have an array of 5 ImageProcessor objects called ip. I want to display
> each object in turn using a loop. So first I declare an array of
> ImagePlus objects, called im. This is shown below. But, the array
> entries ar all null at this point. So, in the in the loop I again use
> new and an ImagePlus constructor to create an ImagePlus object, im[k],
> My question is can this be done without using "new" twice and/or is this
> correct.
>
>
> ImagePlus im[] = new ImagePlus[5];
>
> for(int k = 0; k < 5; k++)
> {
> im[k] = new ImagePlus();
>
> im[k].setProcessor("name",ip[k]);
> im[k].show();
> }

... [show rest of quote]

You have to use the "new" operator twice.  Why?  Because you are
instantiating two _different_ types of classes.  One is and array, and one
is and ImagePlus.

Ciao,
Johannes

[Joachim Wesner]

Hi,

this is so much easier with an ImageStack!

show() will not "un"show other images!

Simply create a stack and cycle throught it with setSlice!


Mit freundlichen Grüßen / Best regards

Joachim Wesner



                                                                           
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All,

I ran into the situation desribed below, but don't understand
Java well enough to know why what I'm doing is done this way. For
what it's worth, I suspect I could do what I want to do easier using
Stacks.

I have an array of 5 ImageProcessor objects called ip.
I want to display each object in turn using a loop. So
first I declare an array of ImagePlus objects, called im.
This is shown below. But, the array entries ar all null
at this point. So, in the in the loop I again use new and
an ImagePlus constructor to create an ImagePlus object, im[k],
My question is can this be done without using "new" twice and/or
is this correct.


ImagePlus im[]                       = new ImagePlus[5];

for(int k = 0; k < 5; k++)
{
             im[k]                         = new ImagePlus();

             im[k].setProcessor("name",ip[k]);
             im[k].show();
}

david Webster



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[Joachim Wesner]

Other suggestion (only to verify basic things):

I assume you want to have a changing content in ONE window!

(Even if not using slices), you would only need ONE ImagePlus and typically
only ONE attached ImageProcessor. To have a dynamic content,
you only need to periodically update the pixel array of the ImageProcessor
and call updateAndDraw(), like the Plasma2_ example plugin does.

Cheers

Mit freundlichen Grüßen / Best regards

Joachim Wesner



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[David Webster]

Joachim,

I had done my coding with arrays as I couldn't figure the documentation on
stacks. But, I fixed that this moring and am now using stacks. I didn't
quite understand your second email. What I am doing is writing some code to
compute texture feature images ans wanted the array/stack to hold the
different feature images. I used arrays at first because I assumed that if I
wanted to use the all feature images in other TBD processes, that I had to
disalky them so that ImageJ became aware of them outside of my plugin.

David Webster

On Fri, Oct 2, 2009 at 7:38 AM, Joachim Wesner <
[hidden email]> wrote:

> Other suggestion (only to verify basic things):
>
> I assume you want to have a changing content in ONE window!
>
> (Even if not using slices), you would only need ONE ImagePlus and typically
> only ONE attached ImageProcessor. To have a dynamic content,
> you only need to periodically update the pixel array of the ImageProcessor
> and call updateAndDraw(), like the Plasma2_ example plugin does.
>
> Cheers
>
> Mit freundlichen Grüßen / Best regards
>
> Joachim Wesner
>
>
>
>  ______________________________________________________________________
> This email has been scanned by the MessageLabs Email Security System.
> For more information please visit http://www.messagelabs.com/email
> ______________________________________________________________________
>

... [show rest of quote]