Method run

ij/src/main/java/ij/plugin/RoiRotator.java:27–55

(String arg)

	private static boolean rotateAroundImageCenter;

	public void run(String arg) {
		ImagePlus imp = IJ.getImage();
		Roi roi = imp.getRoi();
		if (roi==null) {
			IJ.error("Rotate", "This command requires a selection");
			return;
		}
		double angle = showDialog(defaultAngle);
		if (Double.isNaN(angle))
			return;
		if (!IJ.macroRunning())
			defaultAngle = angle;
		FloatPolygon center = roi.getRotationCenter();
		double xcenter = center.xpoints[0];
		double ycenter = center.ypoints[0];
		if (rotateAroundImageCenter) {
			xcenter = imp.getWidth()/2.0;
			ycenter = imp.getHeight()/2.0;
		}
		Roi roi2 = rotate(roi, angle, xcenter, ycenter);
		if (roi2==null && (roi instanceof ImageRoi))
			return;
		if (!rotateAroundImageCenter)
			roi2.setRotationCenter(xcenter,ycenter);
		Undo.setup(Undo.ROI, imp);
		roi = (Roi)roi.clone();
		imp.setRoi(roi2);
		Roi.setPreviousRoi(roi);
	}
	
	public double showDialog(double angle) {
		GenericDialog gd = new GenericDialog("Rotate Selection");