package ij.plugin;
import ij.*;
import ij.gui.*;
import ij.process.*;
import ij.measure.*;
import ij.plugin.frame.*;
import ij.macro.Interpreter;
import ij.plugin.filter.*;
import ij.util.Tools;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.util.Vector;


/** This plugin implements the commands in the Edit/Section submenu. */
public class Selection implements PlugIn, Measurements {
    private ImagePlus imp;
    private float[] kernel = {1f, 1f, 1f, 1f, 1f};
    private float[] kernel3 = {1f, 1f, 1f};
    private static int bandSize = 15; // pixels
    private static Color linec, fillc;
    private static int lineWidth = 1;
    private static boolean smooth;
    private static boolean adjust;

    

    public void run(String arg) {
        imp = WindowManager.getCurrentImage();
        if (arg.equals("add"))
            {addToRoiManager(imp); return;}
        if (imp==null)
            {IJ.noImage(); return;}
        if (arg.equals("all"))
            imp.setRoi(0,0,imp.getWidth(),imp.getHeight());
        else if (arg.equals("none"))
            imp.deleteRoi();
        else if (arg.equals("restore"))
            imp.restoreRoi();
        else if (arg.equals("spline"))
            fitSpline();
        else if (arg.equals("interpolate"))
            interpolate();
        else if (arg.equals("circle"))
            fitCircle(imp);
        else if (arg.equals("ellipse"))
            createEllipse(imp);
        else if (arg.equals("hull"))
            convexHull(imp);
        else if (arg.equals("mask"))
            createMask(imp);        
        else if (arg.equals("from"))
            createSelectionFromMask(imp);       
        else if (arg.equals("inverse"))
            invert(imp); 
        else if (arg.equals("toarea"))
            lineToArea(imp); 
        else if (arg.equals("toline"))
            areaToLine(imp); 
        else if (arg.equals("properties"))
            {setProperties("Properties ", imp.getRoi()); imp.draw();}
        else if (arg.equals("band"))
            makeBand(imp);
        else if (arg.equals("tobox"))
            toBoundingBox(imp); 
        else if (arg.equals("rotate"))
            rotate(imp); 
        else if (arg.equals("enlarge"))
            enlarge(imp); 
    }
    
    private void rotate(ImagePlus imp) {
        Roi roi = imp.getRoi();
        if (IJ.macroRunning()) {
            String options = Macro.getOptions();
            if (options!=null && (options.indexOf("grid=")!=-1||options.indexOf("interpolat")!=-1)) {
                IJ.run("Rotate... ", options); // run Image>Transform>Rotate
                return;
            }
        }
        (new RoiRotator()).run("");
    }
    
    private void enlarge(ImagePlus imp) {
        Roi roi = imp.getRoi();
        if (roi!=null) {
            Undo.setup(Undo.ROI, imp);
            roi = (Roi)roi.clone();
            (new RoiEnlarger()).run("");
        } else
            noRoi("Enlarge");
    }

    /*
    if selection is closed shape, create a circle with the same area and centroid, otherwise use<br>
    the Pratt method to fit a circle to the points that define the line or multi-point selection.<br>
    Reference: Pratt V., Direct least-squares fitting of algebraic surfaces", Computer Graphics, Vol. 21, pages 145-152 (1987).<br>
    Original code: Nikolai Chernov's MATLAB script for Newton-based Pratt fit.<br>
    (http://www.math.uab.edu/~chernov/cl/MATLABcircle.html)<br>
    Java version: https://github.com/mdoube/BoneJ/blob/master/src/org/doube/geometry/FitCircle.java<br>
    Authors: Nikolai Chernov, Michael Doube, Ved Sharma
    */
    void fitCircle(ImagePlus imp) {
        Roi roi = imp.getRoi();
        if (roi==null) {
            noRoi("Fit Circle");
            return;
        }
        
        if (roi.isArea()) {   //create circle with the same area and centroid
            Undo.setup(Undo.ROI, imp);
            ImageProcessor ip = imp.getProcessor();
            ip.setRoi(roi);
            ImageStatistics stats = ImageStatistics.getStatistics(ip, Measurements.AREA+Measurements.CENTROID, null);
            double r = Math.sqrt(stats.pixelCount/Math.PI);
            imp.deleteRoi();
            int d = (int)Math.round(2.0*r);
            Roi roi2 = new OvalRoi((int)Math.round(stats.xCentroid-r), (int)Math.round(stats.yCentroid-r), d, d);
            transferProperties(roi, roi2);
            imp.setRoi(roi2);
            return;
        }
        
        Polygon poly = roi.getPolygon();
        int n=poly.npoints;
        int[] x = poly.xpoints;
        int[] y = poly.ypoints;
        if (n<3) {
            IJ.error("Fit Circle", "At least 3 points are required to fit a circle.");
            return;
        }
        
        // calculate point centroid
        double sumx = 0, sumy = 0;
        for (int i=0; i<n; i++) {
            sumx = sumx + poly.xpoints[i];
            sumy = sumy + poly.ypoints[i];
        }
        double meanx = sumx/n;
        double meany = sumy/n;
        
        // calculate moments
        double[] X = new double[n], Y = new double[n];
        double Mxx=0, Myy=0, Mxy=0, Mxz=0, Myz=0, Mzz=0;
        for (int i=0; i<n; i++) {
            X[i] = x[i] - meanx;
            Y[i] = y[i] - meany;
            double Zi = X[i]*X[i] + Y[i]*Y[i];
            Mxy = Mxy + X[i]*Y[i];
            Mxx = Mxx + X[i]*X[i];
            Myy = Myy + Y[i]*Y[i];
            Mxz = Mxz + X[i]*Zi;
            Myz = Myz + Y[i]*Zi;
            Mzz = Mzz + Zi*Zi;
        }
        Mxx = Mxx/n;
        Myy = Myy/n;
        Mxy = Mxy/n;
        Mxz = Mxz/n;
        Myz = Myz/n;
        Mzz = Mzz/n;
        
        // calculate the coefficients of the characteristic polynomial
        double Mz = Mxx + Myy;
        double Cov_xy = Mxx*Myy - Mxy*Mxy;
        double Mxz2 = Mxz*Mxz;
        double Myz2 = Myz*Myz;
        double A2 = 4*Cov_xy - 3*Mz*Mz - Mzz;
        double A1 = Mzz*Mz + 4*Cov_xy*Mz - Mxz2 - Myz2 - Mz*Mz*Mz;
        double A0 = Mxz2*Myy + Myz2*Mxx - Mzz*Cov_xy - 2*Mxz*Myz*Mxy + Mz*Mz*Cov_xy;
        double A22 = A2 + A2;
        double epsilon = 1e-12; 
        double ynew = 1e+20;
        int IterMax= 20;
        double xnew = 0;
        int iterations = 0;
        
        // Newton's method starting at x=0
        for (int iter=1; iter<=IterMax; iter++) {
            iterations = iter;
            double yold = ynew;
            ynew = A0 + xnew*(A1 + xnew*(A2 + 4.*xnew*xnew));
            if (Math.abs(ynew)>Math.abs(yold)) {
                if (IJ.debugMode) IJ.log("Fit Circle: wrong direction: |ynew| > |yold|");
                xnew = 0;
                break;
            }
            double Dy = A1 + xnew*(A22 + 16*xnew*xnew);
            double xold = xnew;
            xnew = xold - ynew/Dy;
            if (Math.abs((xnew-xold)/xnew) < epsilon)
                break;
            if (iter >= IterMax) {
                if (IJ.debugMode) IJ.log("Fit Circle: will not converge");
                xnew = 0;
            }
            if (xnew<0) {
                if (IJ.debugMode) IJ.log("Fit Circle: negative root:  x = "+xnew);
                xnew = 0;
            }
        }
        if (IJ.debugMode) IJ.log("Fit Circle: n="+n+", xnew="+IJ.d2s(xnew,2)+", iterations="+iterations);
        
        // calculate the circle parameters
        double DET = xnew*xnew - xnew*Mz + Cov_xy;
        double CenterX = (Mxz*(Myy-xnew)-Myz*Mxy)/(2*DET);
        double CenterY = (Myz*(Mxx-xnew)-Mxz*Mxy)/(2*DET);
        double radius = Math.sqrt(CenterX*CenterX + CenterY*CenterY + Mz + 2*xnew);
        if (Double.isNaN(radius)) {
            IJ.error("Fit Circle", "Points are collinear.");
            return;
        }
        CenterX = CenterX + meanx;
        CenterY = CenterY + meany;
        Undo.setup(Undo.ROI, imp);
        imp.deleteRoi();
        IJ.makeOval((int)Math.round(CenterX-radius), (int)Math.round(CenterY-radius), (int)Math.round(2*radius), (int)Math.round(2*radius));
    }

    void fitSpline() {
        Roi roi = imp.getRoi();
        if (roi==null)
            {noRoi("Spline"); return;}
        int type = roi.getType();
        boolean segmentedSelection = type==Roi.POLYGON||type==Roi.POLYLINE;
        if (!(segmentedSelection||type==Roi.FREEROI||type==Roi.TRACED_ROI||type==Roi.FREELINE))
            {IJ.error("Spline", "Polygon or polyline selection required"); return;}
        if (roi instanceof EllipseRoi)
            return;
        PolygonRoi p = (PolygonRoi)roi;
        Undo.setup(Undo.ROI, imp);
        if (!segmentedSelection && p.getNCoordinates()>3) {
            if (p.subPixelResolution())
                p = trimFloatPolygon(p, p.getUncalibratedLength());
            else
                p = trimPolygon(p, p.getUncalibratedLength());
        }
        String options = Macro.getOptions();
        if (options!=null && options.indexOf("straighten")!=-1)
            p.fitSplineForStraightening();
        else if (options!=null && options.indexOf("remove")!=-1)
            p.removeSplineFit();
        else
            p.fitSpline();
        imp.draw();
        LineWidthAdjuster.update(); 
    }
    
    void interpolate() {
        Roi roi = imp.getRoi();
        if (roi==null)
            {noRoi("Interpolate"); return;}
        if (roi.getType()==Roi.POINT)
            return;
        if (IJ.isMacro()&&Macro.getOptions()==null)
            Macro.setOptions("interval=1");
        GenericDialog gd = new GenericDialog("Interpolate");
        gd.addNumericField("Interval:", 1.0, 1, 4, "pixel");
        gd.addCheckbox("Smooth", IJ.isMacro()?false:smooth);
        gd.addCheckbox("Adjust interval to match", IJ.isMacro()?false:adjust);
        gd.showDialog();
        if (gd.wasCanceled())
            return;
        double interval = gd.getNextNumber();
        smooth = gd.getNextBoolean();
        Undo.setup(Undo.ROI, imp);
        adjust = gd.getNextBoolean();
        int sign = adjust ? -1 : 1;
        FloatPolygon poly = roi.getInterpolatedPolygon(sign*interval, smooth);
        int t = roi.getType();
        int type = roi.isLine()?Roi.FREELINE:Roi.FREEROI;
        if (t==Roi.POLYGON && interval>1.0)
            type = Roi.POLYGON;
        if ((t==Roi.RECTANGLE||t==Roi.OVAL||t==Roi.FREEROI) && interval>=8.0)
            type = Roi.POLYGON;
        if ((t==Roi.LINE||t==Roi.FREELINE) && interval>=8.0)
            type = Roi.POLYLINE;
        if (t==Roi.POLYLINE && interval>=8.0)
            type = Roi.POLYLINE;
        ImageCanvas ic = imp.getCanvas();
        if (poly.npoints<=150 && ic!=null && ic.getMagnification()>=12.0)
            type = roi.isLine()?Roi.POLYLINE:Roi.POLYGON;
        Roi p = new PolygonRoi(poly,type);
        if (roi.getStroke()!=null)
            p.setStrokeWidth(roi.getStrokeWidth());
        p.setStrokeColor(roi.getStrokeColor());
        p.setName(roi.getName());
        transferProperties(roi, p);
        imp.setRoi(p);
    }
    
    private static void transferProperties(Roi roi1, Roi roi2) {
        if (roi1==null || roi2==null)
            return;
        roi2.setStrokeColor(roi1.getStrokeColor());
        if (roi1.getStroke()!=null)
            roi2.setStroke(roi1.getStroke());
        roi2.setDrawOffset(roi1.getDrawOffset());
    }
    
    PolygonRoi trimPolygon(PolygonRoi roi, double length) {
        int[] x = roi.getXCoordinates();
        int[] y = roi.getYCoordinates();
        int n = roi.getNCoordinates();
        x = smooth(x, n);
        y = smooth(y, n);
        float[] curvature = getCurvature(x, y, n);
        Rectangle r = roi.getBounds();
        double threshold = rodbard(length);
        //IJ.log("trim: "+length+" "+threshold);
        double distance = Math.sqrt((x[1]-x[0])*(x[1]-x[0])+(y[1]-y[0])*(y[1]-y[0]));
        x[0] += r.x; y[0]+=r.y;
        int i2 = 1;
        int x1,y1,x2=0,y2=0;
        for (int i=1; i<n-1; i++) {
            x1=x[i]; y1=y[i]; x2=x[i+1]; y2=y[i+1];
            distance += Math.sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)) + 1;
            distance += curvature[i]*2;
            if (distance>=threshold) {
                x[i2] = x2 + r.x;
                y[i2] = y2 + r.y;
                i2++;
                distance = 0.0;
            }
        }
        int type = roi.getType()==Roi.FREELINE?Roi.POLYLINE:Roi.POLYGON;
        if (type==Roi.POLYLINE && distance>0.0) {
            x[i2] = x2 + r.x;
            y[i2] = y2 + r.y;
            i2++;
        }       
        PolygonRoi p = new PolygonRoi(x, y, i2, type);
        if (roi.getStroke()!=null)
            p.setStrokeWidth(roi.getStrokeWidth());
        p.setStrokeColor(roi.getStrokeColor());
        p.setName(roi.getName());
        imp.setRoi(p);
        return p;
    }
    
    double rodbard(double x) {
        // y = c*((a-x/(x-d))^(1/b)
        // a=3.9, b=.88, c=712, d=44
        double ex;
        if (x == 0.0)
            ex = 5.0;
        else
            ex = Math.exp(Math.log(x/700.0)*0.88);
        double y = 3.9-44.0;
        y = y/(1.0+ex);
        return y+44.0;
    }

    int[] smooth(int[] a, int n) {
        FloatProcessor fp = new FloatProcessor(n, 1);
        for (int i=0; i<n; i++)
            fp.putPixelValue(i, 0, a[i]);
        GaussianBlur gb = new GaussianBlur();
        gb.blur1Direction(fp, 2.0, 0.01, true, 0);
        for (int i=0; i<n; i++)
            a[i] = (int)Math.round(fp.getPixelValue(i, 0));
        return a;
    }
    
    float[] getCurvature(int[] x, int[] y, int n) {
        float[] x2 = new float[n];
        float[] y2 = new float[n];
        for (int i=0; i<n; i++) {
            x2[i] = x[i];
            y2[i] = y[i];
        }
        ImageProcessor ipx = new FloatProcessor(n, 1, x2, null);
        ImageProcessor ipy = new FloatProcessor(n, 1, y2, null);
        ipx.convolve(kernel, kernel.length, 1);
        ipy.convolve(kernel, kernel.length, 1);
        float[] indexes = new float[n];
        float[] curvature = new float[n];
        for (int i=0; i<n; i++) {
            indexes[i] = i;
            curvature[i] = (float)Math.sqrt((x2[i]-x[i])*(x2[i]-x[i])+(y2[i]-y[i])*(y2[i]-y[i]));
        }
        return curvature;
    }
    
    PolygonRoi trimFloatPolygon(PolygonRoi roi, double length) {
        FloatPolygon poly = roi.getFloatPolygon();
        float[] x = poly.xpoints;
        float[] y = poly.ypoints;
        int n = poly.npoints;
        x = smooth(x, n);
        y = smooth(y, n);
        float[] curvature = getCurvature(x, y, n);
        double threshold = rodbard(length);
        //IJ.log("trim: "+length+" "+threshold);
        double distance = Math.sqrt((x[1]-x[0])*(x[1]-x[0])+(y[1]-y[0])*(y[1]-y[0]));
        int i2 = 1;
        double x1,y1,x2=0,y2=0;
        for (int i=1; i<n-1; i++) {
            x1=x[i]; y1=y[i]; x2=x[i+1]; y2=y[i+1];
            distance += Math.sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)) + 1;
            distance += curvature[i]*2;
            if (distance>=threshold) {
                x[i2] = (float)x2;
                y[i2] = (float)y2;
                i2++;
                distance = 0.0;
            }
        }
        int type = roi.getType()==Roi.FREELINE?Roi.POLYLINE:Roi.POLYGON;
        if (type==Roi.POLYLINE && distance>0.0) {
            x[i2] = (float)x2;
            y[i2] = (float)y2;
            i2++;
        }       
        PolygonRoi p = new PolygonRoi(x, y, i2, type);
        if (roi.getStroke()!=null)
            p.setStrokeWidth(roi.getStrokeWidth());
        p.setStrokeColor(roi.getStrokeColor());
        p.setDrawOffset(roi.getDrawOffset());
        p.setName(roi.getName());
        imp.setRoi(p);
        return p;
    }
    
    float[] smooth(float[] a, int n) {
        FloatProcessor fp = new FloatProcessor(n, 1);
        for (int i=0; i<n; i++)
            fp.setf(i, 0, a[i]);
        GaussianBlur gb = new GaussianBlur();
        gb.blur1Direction(fp, 2.0, 0.01, true, 0);
        for (int i=0; i<n; i++)
            a[i] = fp.getf(i, 0);
        return a;
    }
    
    float[] getCurvature(float[] x, float[] y, int n) {
        float[] x2 = new float[n];
        float[] y2 = new float[n];
        for (int i=0; i<n; i++) {
            x2[i] = x[i];
            y2[i] = y[i];
        }
        ImageProcessor ipx = new FloatProcessor(n, 1, x, null);
        ImageProcessor ipy = new FloatProcessor(n, 1, y, null);
        ipx.convolve(kernel, kernel.length, 1);
        ipy.convolve(kernel, kernel.length, 1);
        float[] indexes = new float[n];
        float[] curvature = new float[n];
        for (int i=0; i<n; i++) {
            indexes[i] = i;
            curvature[i] = (float)Math.sqrt((x2[i]-x[i])*(x2[i]-x[i])+(y2[i]-y[i])*(y2[i]-y[i]));
        }
        return curvature;
    }

    void createEllipse(ImagePlus imp) {
        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) {
        Roi roi = imp.getRoi();
        int type = roi!=null?roi.getType():-1;
        if (!(type==Roi.FREEROI||type==Roi.TRACED_ROI||type==Roi.POLYGON||type==Roi.POINT))
            {IJ.error("Convex Hull", "Polygonal or point selection required"); return;}
        if (roi instanceof EllipseRoi)
            return;
        //if (roi.subPixelResolution() && roi instanceof PolygonRoi) {
        //  FloatPolygon p = ((PolygonRoi)roi).getFloatConvexHull();
        //  if (p!=null)
        //      imp.setRoi(new PolygonRoi(p.xpoints, p.ypoints, p.npoints, roi.POLYGON));
        //} else {
        Polygon p = roi.getConvexHull();
        if (p!=null) {
            Undo.setup(Undo.ROI, imp);
            Roi roi2 = new PolygonRoi(p.xpoints, p.ypoints, p.npoints, roi.POLYGON);
            transferProperties(roi, roi2);
            imp.setRoi(roi2);
        }
    }
    
    // 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) {
        int smallestY = imp.getHeight();
        int x, y;
        for (int i=0; i<n; i++) {
            y = yCoordinates[i];
            if (y<smallestY)
            smallestY = y;
        }
        int smallestX = imp.getWidth();
        int p1 = 0;
        for (int i=0; i<n; i++) {
            x = xCoordinates[i];
            y = yCoordinates[i];
            if (y==smallestY && x<smallestX) {
                smallestX = x;
                p1 = i;
            }
        }
        return p1;
    }
    
    void createMask(ImagePlus imp) {
        Roi roi = imp.getRoi();
        boolean useInvertingLut = Prefs.useInvertingLut;
        Prefs.useInvertingLut = false;
        boolean selectAll = roi!=null && roi.getType()==Roi.RECTANGLE && roi.getBounds().width==imp.getWidth()
            && roi.getBounds().height==imp.getHeight() && imp.isThreshold();
        if (roi==null || !(roi.isArea()||roi.getType()==Roi.POINT) || selectAll) {
            createMaskFromThreshold(imp);
            Prefs.useInvertingLut = useInvertingLut;
            return;
        }
        ImagePlus maskImp = null;
        Frame frame = WindowManager.getFrame("Mask");
        if (frame!=null && (frame instanceof ImageWindow))
            maskImp = ((ImageWindow)frame).getImagePlus();
        if (maskImp==null) {
            ImageProcessor ip = new ByteProcessor(imp.getWidth(), imp.getHeight());
            if (!Prefs.blackBackground)
                ip.invertLut();
            maskImp = new ImagePlus("Mask", ip);
            maskImp.show();
        }
        ImageProcessor ip = maskImp.getProcessor();
        ip.setRoi(roi);
        ip.setValue(255);
        ip.fill(ip.getMask());
        Calibration cal = imp.getCalibration();
        if (cal.scaled()) {
            Calibration cal2 = maskImp.getCalibration();
            cal2.pixelWidth = cal.pixelWidth;
            cal2.pixelHeight = cal.pixelHeight;
            cal2.setUnit(cal.getUnit());
        }
        maskImp.updateAndRepaintWindow();
        Prefs.useInvertingLut = useInvertingLut;
    }
    
    void createMaskFromThreshold(ImagePlus imp) {
        ImageProcessor ip = imp.getProcessor();
        if (ip.getMinThreshold()==ImageProcessor.NO_THRESHOLD)
            {IJ.error("Create Mask", "Area selection or thresholded image required"); return;}
        double t1 = ip.getMinThreshold();
        double t2 = ip.getMaxThreshold();
        IJ.run("Duplicate...", "title=mask");
        ImagePlus imp2 = WindowManager.getCurrentImage();
        ImageProcessor ip2 = imp2.getProcessor();
        ip2.setThreshold(t1, t2, ip2.getLutUpdateMode());
        IJ.run("Convert to Mask");
    }

    void createSelectionFromMask(ImagePlus imp) {
        ImageProcessor ip = imp.getProcessor();
        if (ip.getMinThreshold()!=ImageProcessor.NO_THRESHOLD) {
            IJ.runPlugIn("ij.plugin.filter.ThresholdToSelection", "");
            return;
        }
        if (!ip.isBinary()) {
            IJ.error("Create Selection",
                "This command creates a composite selection from\n"+
                "a mask (8-bit binary image with white background)\n"+
                "or from an image that has been thresholded using\n"+
                "the Image>Adjust>Threshold tool. The current\n"+
                "image is not a mask and has not been thresholded.");
            return;
        }
        int threshold = ip.isInvertedLut()?255:0;
        ip.setThreshold(threshold, threshold, ImageProcessor.NO_LUT_UPDATE);
        IJ.runPlugIn("ij.plugin.filter.ThresholdToSelection", "");
    }

    void invert(ImagePlus imp) {
        Roi roi = imp.getRoi();
        if (roi==null || !roi.isArea())
            {IJ.error("Inverse", "Area selection required"); return;}
        ShapeRoi s1, s2;
        if (roi instanceof ShapeRoi)
            s1 = (ShapeRoi)roi;
        else
            s1 = new ShapeRoi(roi);
        s2 = new ShapeRoi(new Roi(0,0, imp.getWidth(), imp.getHeight()));
        Undo.setup(Undo.ROI, imp);
        imp.setRoi(s1.xor(s2));
    }
    
    private void lineToArea(ImagePlus imp) {
        Roi roi = imp.getRoi();
        if (roi==null || !roi.isLine())
            {IJ.error("Line to Area", "Line selection required"); return;}
        Undo.setup(Undo.ROI, imp);
        Roi roi2 = lineToArea(roi);
        imp.setRoi(roi2);
        Roi.previousRoi = (Roi)roi.clone();
    }
    
    /** Converts a line selection into an area selection. */
    public static Roi lineToArea(Roi roi) {
        Roi roi2 = null;
        if (roi.getType()==Roi.LINE) {
            double width = roi.getStrokeWidth();
            if (width<=1.0)
                roi.setStrokeWidth(1.0000001);
            FloatPolygon p = roi.getFloatPolygon();
            roi.setStrokeWidth(width);
            roi2 = new PolygonRoi(p, Roi.POLYGON);
            roi2.setDrawOffset(roi.getDrawOffset());
        } else {
            roi = (Roi)roi.clone();
            int lwidth = (int)roi.getStrokeWidth();
            if (lwidth<5)
                lwidth = 5;
            Rectangle bounds = roi.getBounds();
            int width = bounds.width + lwidth*2;
            int height = bounds.height + lwidth*2;
            ImageProcessor ip2 = new ByteProcessor(width, height);
            roi.setLocation(lwidth, lwidth);
            ip2.setColor(255);
            roi.drawPixels(ip2);
            ip2.setThreshold(255, 255, ImageProcessor.NO_LUT_UPDATE);
            ThresholdToSelection tts = new ThresholdToSelection();
            roi2 = tts.convert(ip2);
            if (roi2==null)
                return roi;
            if (bounds.x==0&&bounds.y==0)
                roi2.setLocation(0, 0);
            else
                roi2.setLocation(bounds.x-lwidth/2, bounds.y-lwidth/2);
        }
        transferProperties(roi, roi2);
        roi2.setStrokeWidth(0);
        Color c = roi2.getStrokeColor();
        if (c!=null)  // remove any transparency
            roi2.setStrokeColor(new Color(c.getRed(),c.getGreen(),c.getBlue()));
        return roi2;
    }
    
    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();
        if (p==null) return;
        int type1 = roi.getType();
        if (type1==Roi.COMPOSITE) {
            IJ.error("Area to Line", "Composite selections cannot be converted to lines.");
            return;
        }
        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 = new PolygonRoi(p.xpoints, p.ypoints, p.npoints, type2);
        transferProperties(roi, roi2);
        imp.setRoi(roi2);
    }

    void toBoundingBox(ImagePlus imp) {
        Roi roi = imp.getRoi();
        if (roi==null) {
            noRoi("To Bounding Box");
            return;
        }
        Undo.setup(Undo.ROI, imp);
        Rectangle r = roi.getBounds();
        imp.deleteRoi();
        Roi roi2 = new Roi(r.x, r.y, r.width, r.height);
        transferProperties(roi, roi2);
        imp.setRoi(roi2);
    }

    void addToRoiManager(ImagePlus imp) {
        if (IJ.macroRunning() &&  Interpreter.isBatchModeRoiManager())
            IJ.error("run(\"Add to Manager\") may not work in batch mode macros");
        Frame frame = WindowManager.getFrame("ROI Manager");
        if (frame==null)
            IJ.run("ROI Manager...");
        if (imp==null) return;
        Roi roi = imp.getRoi();
        if (roi==null) return;
        frame = WindowManager.getFrame("ROI Manager");
        if (frame==null || !(frame instanceof RoiManager))
            IJ.error("ROI Manager not found");
        RoiManager rm = (RoiManager)frame;
        boolean altDown= IJ.altKeyDown();
        IJ.setKeyUp(IJ.ALL_KEYS);
        if (altDown && !IJ.macroRunning())
            IJ.setKeyDown(KeyEvent.VK_SHIFT);
        if (roi.getState()==Roi.CONSTRUCTING) { //wait (up to 2 sec.) until ROI finished
            long start = System.currentTimeMillis();
            while (true) {
                IJ.wait(10);
                if (roi.getState()!=Roi.CONSTRUCTING)
                    break;
                if ((System.currentTimeMillis()-start)>2000) {
                    IJ.beep();
                    IJ.error("Add to Manager", "Selection is not complete");
                    return;
                }
            }
        }
        rm.allowRecording(true);
        rm.runCommand("add");
        rm.allowRecording(false);
        IJ.setKeyUp(IJ.ALL_KEYS);
    }
    
    boolean setProperties(String title, Roi roi) {
        if ((roi instanceof PointRoi) && Toolbar.getMultiPointMode() && IJ.altKeyDown()) {
            ((PointRoi)roi).displayCounts();
            return true;
        }
        Frame f = WindowManager.getFrontWindow();
        if (f!=null && f.getTitle().indexOf("3D Viewer")!=-1)
            return false;
        if (roi==null) {
            IJ.error("This command requires a selection.");
            return false;
        }
        RoiProperties rp = new RoiProperties(title, roi);
        boolean ok = rp.showDialog();
        if (IJ.debugMode)
            IJ.log(roi.getDebugInfo());
        return ok;
    }
    
    private void makeBand(ImagePlus imp) {
        Roi roi = imp.getRoi();
        if (roi==null) {
            noRoi("Make Band");
            return;
        }
        Roi roiOrig = roi;
        if (!roi.isArea()) {
            IJ.error("Make Band", "Area selection required");
            return;
        }
        Calibration cal = imp.getCalibration();
        double pixels = bandSize;
        double size = pixels*cal.pixelWidth;
        int decimalPlaces = 0;
        if ((int)size!=size)
            decimalPlaces = 2;
        GenericDialog gd = new GenericDialog("Make Band");
        gd.addNumericField("Band Size:", size, decimalPlaces, 4, cal.getUnits());
        gd.showDialog();
        if (gd.wasCanceled())
            return;
        size = gd.getNextNumber();
        if (Double.isNaN(size)) {
            IJ.error("Make Band", "invalid number");
            return;
        }
        int n = (int)Math.round(size/cal.pixelWidth); 
        if (n >255) {
            IJ.error("Make Band", "Cannot make bands wider that 255 pixels");
            return;
        }
        int width = imp.getWidth();
        int height = imp.getHeight();
        Rectangle r = roi.getBounds();
        ImageProcessor ip = roi.getMask();
        if (ip==null) {
            ip = new ByteProcessor(r.width, r.height);
            ip.invert();
        }
        ImageProcessor mask = new ByteProcessor(width, height);
        mask.insert(ip, r.x, r.y);
        ImagePlus edm = new ImagePlus("mask", mask);
        boolean saveBlackBackground = Prefs.blackBackground;
        Prefs.blackBackground = false;
        int saveType = EDM.getOutputType();
        EDM.setOutputType(EDM.BYTE_OVERWRITE);
        IJ.run(edm, "Distance Map", "");
        EDM.setOutputType(saveType);
        Prefs.blackBackground = saveBlackBackground;
        ip = edm.getProcessor();
        ip.setThreshold(0, n, ImageProcessor.NO_LUT_UPDATE);
        int xx=-1, yy=-1;
        for (int x=r.x; x<r.x+r.width; x++) {
            for (int y=r.y; y<r.y+r.height; y++) {
                if (ip.getPixel(x, y)<n) {
                    xx=x; yy=y;
                    break;
                }
            }
            if (xx>=0||yy>=0)
                break;
        }
        int count = IJ.doWand(edm, xx, yy, 0, null);
        if (count<=0) {
            IJ.error("Make Band", "Unable to make band");
            return;
        }
        ShapeRoi roi2 = new ShapeRoi(edm.getRoi());
        if (!(roi instanceof ShapeRoi))
            roi = new ShapeRoi(roi);
        ShapeRoi roi1 = (ShapeRoi)roi;
        roi2 = roi2.not(roi1);
        Undo.setup(Undo.ROI, imp);
        transferProperties(roiOrig, roi2);
        imp.setRoi(roi2);
        bandSize = n;
    }
    
    void noRoi(String command) {
        IJ.error(command, "This command requires a selection");
    }

}