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Changing ROI labels

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Damian

Changing ROI labels

Is it possible to change the position of ROI labels? It appears that they are always located in the center of the ROI. Ideally, I would like to be able to move them to a position outside the ROI.

Thanks in advance.

Michael Schmid

Re: Changing ROI labels

Hi Damian,

the position for drawing the labels is hardcoded in ImageCanvas, lines
438 & 439. It is the center of the bounding rectangle.
The only easy way out would be a macro adding an overlay with the labels
at the desired position.

Michael
________________________________________________________________
On 2016-05-03 21:43, Damian wrote:

> Is it possible to change the position of ROI labels? It appears that they are
> always located in the center of the ROI. Ideally, I would like to be able to
> move them to a position outside the ROI.
>
> Thanks in advance.
>
>
>
> --
> View this message in context: http://imagej.1557.x6.nabble.com/Changing-ROI-labels-tp5016316.html
> Sent from the ImageJ mailing list archive at Nabble.com.
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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Krs5

Re: Changing ROI labels

Dear Damian,

I wrote a little macro yesterday to see how this would work. See below. Did not fully test it. The ROIs have to be added to the ROI manager before the macro can run. The labels are added to an overlay.

------------------------------ start ----------------------------
// This macro will add ROI labels on an overlay to the right or below
// the ROIs stored in the ROI manager.
// Kees Straatman, University of Leicester, 4 May 2016

macro ROI_Labels{
// Collect settings
Dialog.create("ROI labels");
Dialog.addChoice("Font name",newArray("SanSerif", "Serif", "Arial", "Times New Roman"), "SanSerif");
Dialog.addChoice("Label colour", newArray("black", "blue", "cyan", "darkGray", "gray", "green", "lightGray", "magenta", "orange", "pink", "red", "white", "yellow"), "red");
Dialog.addChoice("Label size", newArray("10","12","14", "18", "24","36"), 14);
Dialog.addChoice("Additional font settings", newArray("none", "bold", "italic"), "None");
Dialog.addChoice("Label position to ROI",newArray("right", "below"));
Dialog.show;
fonts = Dialog.getChoice();
colour = Dialog.getChoice();
size = Dialog.getChoice();
extra = Dialog.getChoice();
position = Dialog.getChoice();

// Set font
setFont(fonts, size, extra);
setColor(colour);

// Deselect ROI manager labels
roiManager("Show All without labels");

// image dimensions
getDimensions(width, height, channels, slices, frames)
// Create new labels
for (i = 0; i<roiManager("count");i++){
roiManager("select", i);
Roi.getBounds(x, y, width, height);
n = i+1;

// Correct label position for font size
if (size < 16) p = 10;
else if (size < 24) p = 12;
else p= 20;

// Labels to the right
if (position == "right"){
x1 = x + width + 5;
y1 = y + 0.5*height +p;

}else{
// Labels below
x1 = x + 0.5*width -5;
y1 = y + height + 2*p;

}
// Create overlay on correct slice
Stack.getPosition(channel, slice, frame);
Overlay.drawString(n, x1, y1);
Overlay.setPosition(channel, slice, frame);
Overlay.show;
}
}

------------------------ end ----------------------------------

Dr Ir K.R. Straatman
Senior Experimental Officer
Advanced Imaging Facility
Centre for Core Biotechnology Services
University of Leicester
http://www2.le.ac.uk/colleges/medbiopsych/facilities-and-services/cbs/lite/aif

-----Original Message-----
From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of Michael Schmid
Sent: 04 May 2016 08:47
To: [hidden email]
Subject: Re: Changing ROI labels

Hi Damian,

the position for drawing the labels is hardcoded in ImageCanvas, lines
438 & 439. It is the center of the bounding rectangle.
The only easy way out would be a macro adding an overlay with the labels at the desired position.

Michael
________________________________________________________________
On 2016-05-03 21:43, Damian wrote:

> Is it possible to change the position of ROI labels? It appears that
> they are always located in the center of the ROI. Ideally, I would
> like to be able to move them to a position outside the ROI.
>
> Thanks in advance.
>
>
>
> --
> View this message in context:
> http://imagej.1557.x6.nabble.com/Changing-ROI-labels-tp5016316.html
> Sent from the ImageJ mailing list archive at Nabble.com.
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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lihong.zhan

Re: Changing ROI labels

In reply to this post by Damian

Hi Damian,

I am guessing by this point you probably already found a way to add label to
ROI at different positions. Just in case there are others like myself
interested in the same topic, here is what I wrote that will put the label
on the upper left corner of ROIs.

Lihong

run("Colors...", "foreground=white background=black selection=yellow");
setFont("Serif", 24, "antiliased");
//set the label font size.
count=roiManager("count");
for (i=0; i<count; i++) {
roiManager("Select", i);
getSelectionBounds(x, y, width, height);
//Get the coordinates(x,y,) of the selected ROI[i].
//Returns the smallest rectangle that can completely contain the current
selection.
//x and y are the pixel coordinates of the upper left corner of the
rectangle.
drawString(i, x, y);
//write the index i on the image at coordinates x, y,;
roiManager("Select", i);
roiManager("Draw");
//draw a white outline of the ROI;
}

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Sent from: http://imagej.1557.x6.nabble.com/

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