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Overlay question

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Cammer, Michael-2

Overlay question

Perhaps I missed this in the recent discussions of overlays, but I have a question I hope someone can help with.

When I put text overlay on a slice in a stack but typig the text and adding the overlay from the menu, the overlay is only displayed on one slice.

However, in a macro when I use a command such as

Overlay.drawString(outputstrings[i-1], 260, 290);

the overlay is displayed on the entire stack, not just the one slice.

Also, based on the recorder, I tried

Overlay.drawString(outputstrings[i-1], 260, 290, 0.0);

but this is the same.

Help greatly appreciated.

Best regards-

Michael Cammer, Sr Research Scientist, DART Microscopy Laboratory

NYU Langone Health, 540 First Avenue, SK2 Microscopy Suite, New York, NY 10016

[hidden email]<mailto:[hidden email]> http://nyulmc.org/micros http://microscopynotes.com/

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Wayne Rasband-2

Re: Overlay question

> On Nov 15, 2018, at 10:35 PM, Cammer, Michael <[hidden email]> wrote:
>
> Perhaps I missed this in the recent discussions of overlays, but I have a question I hope someone can help with.
>
> When I put text overlay on a slice in a stack but typig the text and adding the overlay from the menu, the overlay is only displayed on one slice.
>
> However, in a macro when I use a command such as
>
> Overlay.drawString(outputstrings[i-1], 260, 290);
>
> the overlay is displayed on the entire stack, not just the one slice.

Use Overlay.setPosition(slice) to specify which slice the text is displayed on. Here is an example:

newImage("Untitled", "8-bit noise", 500, 500, 5);
setFont("SansSerif", 40, " antialiased");
setColor("cyan");
Overlay.drawString("This text only appears\non the third slice.", 20, 200);
Overlay.setPosition(3)
Overlay.show();
setSlice(3);

Use Overlay.setPosition(0) to have the text displayed on the entire stack.

> Also, based on the recorder, I tried
>
> Overlay.drawString(outputstrings[i-1], 260, 290, 0.0);
>
> but this is the same.

The fourth argument is the angle.

-wayne

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Kenneth Sloan-2

Re: Overlay question

Please allow me to hijack this thread to thank Wayne (and others) for help on my Overlay questions.

As it turned out, I could not use the standard BrushTool - but their help made it easier for
me to implement my own code to annotate a stack (create an Overlay from an image, edit the Overlay
and finally extract the edited image).

What I learned: the Overlay feature is very useful, and *can* be used by several different non-cooperating
processes simultaneously, but this requires great care in writing each individual piece of code. It is
all too easy to assume (and I am guilty of this, as well) that your code is the only game in town.

As I say - the necessary mechanisms for sharing Overlays all seem to be in place; the problem is in
making sure that user-level plugins/macros don't step on each other's toes.

In my case, I originally thought that I wanted two distinct Objects to manipulate an Overlay on a stack. When this
proved difficult, I took the easy way out and duplicated the stack. As it happens, this actually lead to an improvement
in the interface I was building. I eventually saw a way to make it happen on one stack - but by that time I
had realized that the two-stack solution was preferable. So...lazy me...I filed this away in my "lessons learned"
folder. I'll try realHard to write cleaner code...next time.

In particular:

a) don't blindly use setOverlay() without first checking to see if an Overlay already exists - either
manipulate an existing Overlay or save it and restore it when you are done.
b) attach NAMES to Rois that you create/manipulate
c) use the NAMES to identify the Roi you want to manipulate - do not depend on TYPE or POSITION
in the list of Rois in an Overlay
d) document the NAMES to facilitate interactions between plugins/macros that you did not initially expect.
e) which leads to...worry about namespace problems

Again, thanks to Wayne (and others who responded) for showing me the way forward.

--
Kenneth Sloan
[hidden email]
Vision is the art of seeing what is invisible to others.

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Fred Damen

Recorder bug

Greetings,

Plugins->Macros->Record... (Java)

Compile and Run:
import ij.*;
import ij.io.*;
import ij.process.*;
import ij.gui.*;
import java.awt.*;
import ij.plugin.*;
import ij.plugin.frame.*;

public class DirectoryChooserBug implements PlugIn {
public void run(String arg) {
DirectoryChooser dc = new DirectoryChooser("Select");
String sdir = dc.getDirectory();
}
}

Click Cancel and Receive(Windows/Linux):
ImageJ 1.52h; Java 1.8.0_112 [64-bit]; Windows 7 6.1; 53MB of 12219MB (<1%)

java.lang.NullPointerException
at ij.plugin.frame.Recorder.fixPath(Recorder.java:135)
at ij.plugin.frame.Recorder.recordPath(Recorder.java:415)
at ij.io.DirectoryChooser.getDirectory(DirectoryChooser.java:118)
at DirectoryChooserBug.run(DirectoryChooserBug.java:12)
at ij.plugin.PlugInExecuter.runCompiledPlugin(Compiler.java:323)
at ij.plugin.PlugInExecuter.run(Compiler.java:312)
at java.lang.Thread.run(Thread.java:745)

Fred

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Wayne Rasband-2

Re: Recorder bug

> On Nov 19, 2018, at 3:26 PM, Fred Damen <[hidden email]> wrote:
>
> Greetings,
>
> Plugins->Macros->Record... (Java)

The latest ImageJ daily build (1.52i48) fixes a bug that could cause a NullPointerException when recording a file path.

-wayne

> Compile and Run:
> import ij.*;
> import ij.io.*;
> import ij.process.*;
> import ij.gui.*;
> import java.awt.*;
> import ij.plugin.*;
> import ij.plugin.frame.*;
>
> public class DirectoryChooserBug implements PlugIn {
> public void run(String arg) {
> DirectoryChooser dc = new DirectoryChooser("Select");
> String sdir = dc.getDirectory();
> }
> }
>
> Click Cancel and Receive(Windows/Linux):
> ImageJ 1.52h; Java 1.8.0_112 [64-bit]; Windows 7 6.1; 53MB of 12219MB (<1%)
>
> java.lang.NullPointerException
> at ij.plugin.frame.Recorder.fixPath(Recorder.java:135)
> at ij.plugin.frame.Recorder.recordPath(Recorder.java:415)
> at ij.io.DirectoryChooser.getDirectory(DirectoryChooser.java:118)
> at DirectoryChooserBug.run(DirectoryChooserBug.java:12)
> at ij.plugin.PlugInExecuter.runCompiledPlugin(Compiler.java:323)
> at ij.plugin.PlugInExecuter.run(Compiler.java:312)
> at java.lang.Thread.run(Thread.java:745)
>
> Fred

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Robert Smith

Re: Recorder bug

Thanks Wayne!!!!
Bob
________________________________
From: Wayne Rasband <[hidden email]>
Sent: Monday, November 19, 2018 11:21 PM
To: [hidden email]
Subject: Re: Recorder bug

> On Nov 19, 2018, at 3:26 PM, Fred Damen <[hidden email]> wrote:
>
> Greetings,
>
> Plugins->Macros->Record... (Java)

The latest ImageJ daily build (1.52i48) fixes a bug that could cause a NullPointerException when recording a file path.

-wayne

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