Method createEllipse

ij/src/main/java/ij/plugin/Selection.java:547–571

(ImagePlus imp)

	}

	void createEllipse(ImagePlus imp) {
		if (!imp.okToDeleteRoi()) return;
		IJ.showStatus("Fitting ellipse");
		Roi roi = imp.getRoi();
		if (roi==null)
			{noRoi("Fit Ellipse"); return;}
		if (roi.isLine())
			{IJ.error("Fit Ellipse", "\"Fit Ellipse\" does not work with line selections"); return;}
		ImageProcessor ip = imp.getProcessor();
		ip.setRoi(roi);
		int options = Measurements.CENTROID+Measurements.ELLIPSE;
		ImageStatistics stats = ImageStatistics.getStatistics(ip, options, null);
		double dx = stats.major*Math.cos(stats.angle/180.0*Math.PI)/2.0;
		double dy = - stats.major*Math.sin(stats.angle/180.0*Math.PI)/2.0;
		double x1 = stats.xCentroid - dx;
		double x2 = stats.xCentroid + dx;
		double y1 = stats.yCentroid - dy;
		double y2 = stats.yCentroid + dy;
		double aspectRatio = stats.minor/stats.major;
		Undo.setup(Undo.ROI, imp);
		imp.deleteRoi();
		Roi roi2 = new EllipseRoi(x1,y1,x2,y2,aspectRatio);
		transferProperties(roi, roi2);
		imp.setRoi(roi2);
	}

	void convexHull(ImagePlus imp) {
		if (!imp.okToDeleteRoi()) return;