Method convexHull

ij/src/main/java/ij/plugin/Selection.java:573–588

(ImagePlus imp)

	}

	void convexHull(ImagePlus imp) {
		if (!imp.okToDeleteRoi()) return;
		long startTime = System.currentTimeMillis();
		Roi roi = imp.getRoi();
		if (roi == null) { IJ.error("Convex Hull", "Selection required"); return; }
		if (roi instanceof Line) { IJ.error("Convex Hull", "Area selection, point selection, or segmented or free line required"); return; }
		FloatPolygon p = roi.getFloatConvexHull();
		if (p!=null) {
			Undo.setup(Undo.ROI, imp);
			imp.deleteRoi();
			Roi roi2 = new PolygonRoi(p, Roi.POLYGON);
			transferProperties(roi, roi2);
			imp.setRoi(roi2);
			IJ.showTime(imp, startTime, "Convex Hull ", 1);
		}
	}
	
	// Finds the index of the upper right point that is guaranteed to be on convex hull
	/*int findFirstPoint(int[] xCoordinates, int[] yCoordinates, int n, ImagePlus imp) {