ImageJ

automatic creation of a sphere embedded within a sphere?

_‹ Previous Topic Next Topic _›

Classic

List

Threaded

4 messages Options

Wes Armour

automatic creation of a sphere embedded within a sphere?

Hi All,

I'd like to create a text image that contains a black sphere within a
grey sphere.

I can do this easily for a 2d image of two circle, one embedded in the
other. I could then create images of increasing and then decreasing
radius. Using theses varying images I could get my sphere.

This would be a lot of hard work, so I was wondering if there was a way
to automate the creation of these 2d images???

Thanks,

Wes.

Joachim Wesner

Antwort: automatic creation of a sphere embedded within a sphere?

HI Wes,

this should be pretty easy with a macro and an image stack.
You can draw a circle in a circle combined with fill as you already did and
use the macro recorder to see what the corresponding code looks like
(pretty simple),

Then put this code in a loop that counts through all slices, adjusting the
radii (now variables) as necessary

Joachim
____________________________________________

Leica Microsystems CMS GmbH | GmbH mit Sitz in Wetzlar | Amtsgericht
Wetzlar HRB 2432
Geschäftsführer: Dr. Stefan Traeger | Dr. Wolf-Otto Reuter | Dr. David Roy
Martyr | Colin Davis

Wes Armour
<wes.armour@DIAMO
ND.AC.UK> An
Gesendet von: [hidden email]
ImageJ Interest Kopie
Group
<[hidden email]. Thema
GOV> automatic creation of a sphere
embedded within a sphere?

26.02.2008 15:40

Bitte antworten
an
wes.armour@diamon
d.ac.uk

Hi All,

I'd like to create a text image that contains a black sphere within a
grey sphere.

I can do this easily for a 2d image of two circle, one embedded in the
other. I could then create images of increasing and then decreasing
radius. Using theses varying images I could get my sphere.

This would be a lot of hard work, so I was wondering if there was a way
to automate the creation of these 2d images???

Thanks,

Wes.

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email
______________________________________________________________________

Justin McGrath

Re: automatic creation of a sphere embedded within a sphere?

Joachim, how would you calculate the radius of the circle in each slice?

Would this work?

Use (x-x0)^2 + (y-y0)^2 + (z-z0)^2 = r^2. r is whatever radius you want and
x0,y0,z0 is the center of the sphere. Then cycle through z (the stacks) and
x in two for loops solving for y (two solutions). Since y won't be an
integer, you could round to the nearest integer and scale the brightness
based on how close an integer it is (and you could calculate the brightness
for the neighboring pixels if you wanted). Then use

setSlice(z);
setPixel(x, y_interger1, brightness*y1_scale);
setPixel(x, y_interger2, brightness*y2_scale);
//Maybe setPixel for neighbors as well.

You only need to cycle through x values between +(x0+r) and -(x0+r).

Justin

On Tue, Feb 26, 2008 at 8:50 AM, Joachim Wesner <
[hidden email]> wrote:

> HI Wes,
>
> this should be pretty easy with a macro and an image stack.
> You can draw a circle in a circle combined with fill as you already did
> and
> use the macro recorder to see what the corresponding code looks like
> (pretty simple),
>
> Then put this code in a loop that counts through all slices, adjusting the
> radii (now variables) as necessary
>
> Joachim
> ____________________________________________
>
> Leica Microsystems CMS GmbH | GmbH mit Sitz in Wetzlar | Amtsgericht
> Wetzlar HRB 2432
> Geschäftsführer: Dr. Stefan Traeger | Dr. Wolf-Otto Reuter | Dr. David
> Roy
> Martyr | Colin Davis
>
>
>
> Wes Armour
> <wes.armour@DIAMO
> ND.AC.UK> An
> Gesendet von: [hidden email]
> ImageJ Interest Kopie
> Group
> <[hidden email]. Thema
> GOV> automatic creation of a sphere
> embedded within a sphere?
>
> 26.02.2008 15:40
>
>
> Bitte antworten
> an
> wes.armour@diamon
> d.ac.uk
>
>
>
>
>
>
> Hi All,
>
> I'd like to create a text image that contains a black sphere within a
> grey sphere.
>
> I can do this easily for a 2d image of two circle, one embedded in the
> other. I could then create images of increasing and then decreasing
> radius. Using theses varying images I could get my sphere.
>
> This would be a lot of hard work, so I was wondering if there was a way
> to automate the creation of these 2d images???
>
> Thanks,
>
> Wes.
>
>
>
> ______________________________________________________________________
> This email has been scanned by the MessageLabs Email Security System.
> For more information please visit http://www.messagelabs.com/email
> ______________________________________________________________________
>

Joachim Wesner

Antwort: Re: automatic creation of a sphere embedded within a sphere?

Hi there,

I was not the original poster of this problem, however I thought along
those lines. Actually I even considered using makeoval and filling instead
of "solving"
the circle equation to generate the slices, but should work that way
too....

Joachim

Justin McGrath
<[hidden email]
U> An
Gesendet von: [hidden email]
ImageJ Interest Kopie
Group
<[hidden email]. Thema
GOV> Re: automatic creation of a sphere
embedded within a sphere?

26.02.2008 16:38

Bitte antworten
an
ImageJ Interest
Group
<[hidden email].
GOV>

Joachim, how would you calculate the radius of the circle in each slice?

Would this work?

Use (x-x0)^2 + (y-y0)^2 + (z-z0)^2 = r^2. r is whatever radius you want
and
x0,y0,z0 is the center of the sphere. Then cycle through z (the stacks)
and
x in two for loops solving for y (two solutions). Since y won't be an
integer, you could round to the nearest integer and scale the brightness
based on how close an integer it is (and you could calculate the brightness
for the neighboring pixels if you wanted). Then use

setSlice(z);
setPixel(x, y_interger1, brightness*y1_scale);
setPixel(x, y_interger2, brightness*y2_scale);
//Maybe setPixel for neighbors as well.

You only need to cycle through x values between +(x0+r) and -(x0+r).

Justin

On Tue, Feb 26, 2008 at 8:50 AM, Joachim Wesner <
[hidden email]> wrote:

> HI Wes,
>
> this should be pretty easy with a macro and an image stack.
> You can draw a circle in a circle combined with fill as you already did
> and
> use the macro recorder to see what the corresponding code looks like
> (pretty simple),
>
> Then put this code in a loop that counts through all slices, adjusting
the

> radii (now variables) as necessary
>
> Joachim
> ____________________________________________
>
> Leica Microsystems CMS GmbH | GmbH mit Sitz in Wetzlar | Amtsgericht
> Wetzlar HRB 2432
> Geschäftsführer: Dr. Stefan Traeger | Dr. Wolf-Otto Reuter | Dr. David
> Roy
> Martyr | Colin Davis
>
>
>
> Wes Armour
> <wes.armour@DIAMO
> ND.AC.UK> An
> Gesendet von: [hidden email]
> ImageJ Interest Kopie
> Group
> <[hidden email]. Thema
> GOV> automatic creation of a sphere
> embedded within a sphere?
>
> 26.02.2008 15:40
>
>
> Bitte antworten
> an
> wes.armour@diamon
> d.ac.uk
>
>
>
>
>
>
> Hi All,
>
> I'd like to create a text image that contains a black sphere within a
> grey sphere.
>
> I can do this easily for a 2d image of two circle, one embedded in the
> other. I could then create images of increasing and then decreasing
> radius. Using theses varying images I could get my sphere.
>
> This would be a lot of hard work, so I was wondering if there was a way
> to automate the creation of these 2d images???
>
> Thanks,
>
> Wes.
>
>
>
> ______________________________________________________________________
> This email has been scanned by the MessageLabs Email Security System.
> For more information please visit http://www.messagelabs.com/email
> ______________________________________________________________________
>

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email
______________________________________________________________________