Method areaToLine

ij/src/main/java/ij/plugin/Selection.java:728–759

(ImagePlus imp)

	}
	
	void areaToLine(ImagePlus imp) {
		Roi roi = imp.getRoi();
		if (roi==null || !roi.isArea()) {
			IJ.error("Area to Line", "Area selection required");
			return;
		}
		Undo.setup(Undo.ROI, imp);
		Polygon p = roi.getPolygon();
		FloatPolygon fp = (roi.subPixelResolution()) ? roi.getFloatPolygon() : null;
		if (p==null && fp==null)
			return;
		int type1 = roi.getType();
		if (type1==Roi.COMPOSITE) {
			IJ.error("Area to Line", "Composite selections cannot be converted to lines.");
			return;
		}
		if (fp==null && type1==Roi.TRACED_ROI) {
			for (int i=0; i<p.npoints; i++) {
				if (p.xpoints[i]>=imp.getWidth()) p.xpoints[i]=imp.getWidth()-1;
				if (p.ypoints[i]>=imp.getHeight()) p.ypoints[i]=imp.getHeight()-1;
			}
		}
		int type2 = Roi.POLYLINE;
		if (type1==Roi.OVAL||type1==Roi.FREEROI||type1==Roi.TRACED_ROI
		||((roi instanceof PolygonRoi)&&((PolygonRoi)roi).isSplineFit()))
			type2 = Roi.FREELINE;
		Roi roi2 = fp==null ? new PolygonRoi(p, type2) : new PolygonRoi(fp, type2);
		transferProperties(roi, roi2);
		Rectangle2D.Double bounds = roi.getFloatBounds();
		roi2.setLocation(bounds.x - 0.5, bounds.y -0.5);	//area and line roi coordinates are 0.5 pxl different
		imp.setRoi(roi2);
	}

	void toBoundingBox(ImagePlus imp) {
		Roi roi = imp.getRoi();