ROI Iterator Demo

Authors: Wilhelm Burger and Wayne Rasband

History: 2016/04/15: First version

Source: Roi_Iterator_Demo.java

Requires: ImageJ 1.51a or later

Installation: Save Roi_Iterator_Demo.java in the ImageJ/plugins folder and compile and run it using the Plugins>Compile and Run command.
Description:
This plugin demonstrates how to iterate over the points contained in a selection. What it does is generate a binary image of all points included in the current overlay or selection.
JavaScript does not support Java's enhanced for loop so you must use an explicit iterator loop, for example:
  img = IJ.getImage();
  ip = new ByteProcessor(img.getWidth(),img.getHeight());
  roi = img.getRoi();
  iter = roi.iterator();
  while (iter.hasNext()) {
     p = iter.next();
     ip.set(p.x,p.y,255);
  }
  new ImagePlus("Contained Points",ip).show();
In a macro, use the getContainedPoints(x,y) function to iterate over the points in a selection, for example:
  Roi.getContainedPoints(x,y);
  newImage("Contained Points","8-bit black",getWidth,getHeight,1);
  setColor(255);
  for (i=0; i<x.length; i++)
     putPixel(x[i], y[i], 255);
     
Test image: Shapes.tif

Authors:	Wilhelm Burger and Wayne Rasband
History:	2016/04/15: First version
Source:	Roi_Iterator_Demo.java
Requires:	ImageJ 1.51a or later
Installation:	Save Roi_Iterator_Demo.java in the ImageJ/plugins folder and compile and run it using the Plugins>Compile and Run command.
Description:	This plugin demonstrates how to iterate over the points contained in a selection. What it does is generate a binary image of all points included in the current overlay or selection. JavaScript does not support Java's enhanced for loop so you must use an explicit iterator loop, for example: img = IJ.getImage(); ip = new ByteProcessor(img.getWidth(),img.getHeight()); roi = img.getRoi(); iter = roi.iterator(); while (iter.hasNext()) { p = iter.next(); ip.set(p.x,p.y,255); } new ImagePlus("Contained Points",ip).show(); In a macro, use the getContainedPoints(x,y) function to iterate over the points in a selection, for example: Roi.getContainedPoints(x,y); newImage("Contained Points","8-bit black",getWidth,getHeight,1); setColor(255); for (i=0; i<x.length; i++) putPixel(x[i], y[i], 255);
Test image:	Shapes.tif