Example code using ContextPlugin code

ContextPluginExample.java

package imagej.core.plugins.display;

import java.util.List;

import imagej.ImageJ;
import imagej.data.Dataset;
import imagej.data.display.ImageDisplay;
import imagej.display.Display;
import imagej.display.DisplayService;
import imagej.ext.plugin.Menu;
import imagej.ext.plugin.Parameter;
import imagej.ext.plugin.Plugin;
import imagej.ext.plugin.RunnablePlugin;
import imagej.menu.MenuConstants;
import imagej.module.ItemIO;


@Plugin(menu = {
	@Menu(label = MenuConstants.PLUGINS_LABEL,
			weight = MenuConstants.PLUGINS_WEIGHT,
			mnemonic = MenuConstants.PLUGINS_MNEMONIC),
	@Menu(label = "Utilities"),
	@Menu(label = "Capture some other Image", weight = 22)})
public class CaptureSomeOtherImage implements RunnablePlugin {

	@Parameter
	private ImageJ context;
	
	@Parameter
	private DisplayService displayService;
	
	@Parameter
	private ImageDisplay display;
	
	@Parameter(type=ItemIO.OUTPUT)
	private Dataset output;
	
	@Override
	public void run() {
		CaptureImage capturer = new CaptureImage();
		capturer.setContext(context);
		ImageDisplay someOtherDisplay = findOtherDisplay();
		if (someOtherDisplay == null) {
			output = null;
		}
		else {
			capturer.setImageDisplay(someOtherDisplay);
			capturer.run();
			output = capturer.getOutput();
		}
	}
	
	private ImageDisplay findOtherDisplay() {
		List<Display<?>> displays = displayService.getDisplays();
		for (Display<?> d : displays) {
			if (d instanceof ImageDisplay) {
				ImageDisplay id = (ImageDisplay) d;
				if (id != display) return id;
			}
		}
		return null;
	}

}