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package ij.plugin;
import ij.*;
import ij.process.*;
import ij.gui.*;
import java.awt.*;
import java.awt.geom.*;
/** This plugin implements the Edit/Selection/Rotate command. */
public class RoiRotator implements PlugIn {
private static double defaultAngle = 15;
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");
int decimalPlaces = 0;
if ((int)angle!=angle)
decimalPlaces = 2;
if (Macro.getOptions()!=null)
rotateAroundImageCenter = false;
gd.addNumericField("Angle:", angle, decimalPlaces, 3, "degrees");
gd.addCheckbox("Rotate around image center", rotateAroundImageCenter);
gd.setInsets(5, 0, 0);
gd.addMessage("Enter negative angle to \nrotate counter-clockwise", null, Color.darkGray);
gd.showDialog();
if (gd.wasCanceled())
return Double.NaN;
rotateAroundImageCenter = gd.getNextBoolean();
return gd.getNextNumber();
}
public static Roi rotate(Roi roi, double angle) {
if (roi instanceof ImageRoi) {
((ImageRoi)roi).rotate(angle);
return roi;
}
FloatPolygon center = roi.getRotationCenter();
double xcenter = center.xpoints[0];
double ycenter = center.ypoints[0];
Roi roi2 = rotate(roi, angle, xcenter, ycenter);
roi2.setRotationCenter(xcenter,ycenter);
return roi2;
}
public static Roi rotate(Roi roi, double angle, double xcenter, double ycenter) {
double theta = -angle*Math.PI/180.0;
if (roi instanceof ShapeRoi)
return rotateShape((ShapeRoi)roi, -theta, xcenter, ycenter);
FloatPolygon poly = roi.getFloatPolygon();
int type = roi.getType();
boolean rotatedRect = roi instanceof RotatedRectRoi;
double rotatedRectWidth = 0;
if (type==Roi.LINE) {
Line line = (Line)roi;
double x1=line.x1d;
double y1=line.y1d;
double x2=line.x2d;
double y2=line.y2d;
poly = new FloatPolygon();
poly.addPoint(x1, y1);
poly.addPoint(x2, y2);
} else if (rotatedRect) {
double[] p = ((RotatedRectRoi)roi).getParams();
poly = new FloatPolygon();
poly.addPoint(p[0], p[1]);
poly.addPoint(p[2], p[3]);
rotatedRectWidth = p[4];
}
for (int i=0; i<poly.npoints; i++) {
double dx = poly.xpoints[i]-xcenter;
double dy = ycenter-poly.ypoints[i];
double radius = Math.sqrt(dx*dx+dy*dy);
double a = Math.atan2(dy, dx);
poly.xpoints[i] = (float)(xcenter + radius*Math.cos(a+theta));
poly.ypoints[i] = (float)(ycenter - radius*Math.sin(a+theta));
}
Roi roi2 = null;
if (type==Roi.LINE)
roi2 = new Line(poly.xpoints[0], poly.ypoints[0], poly.xpoints[1], poly.ypoints[1]);
else if (rotatedRect)
roi2 = new RotatedRectRoi(poly.xpoints[0], poly.ypoints[0], poly.xpoints[1], poly.ypoints[1], rotatedRectWidth);
else if (type==Roi.POINT)
roi2 = new PointRoi(poly.xpoints, poly.ypoints,poly.npoints);
else {
if (type==Roi.RECTANGLE)
type = Roi.POLYGON;
if (type==Roi.RECTANGLE && poly.npoints>4) // rounded rectangle
type = Roi.FREEROI;
if (type==Roi.OVAL||type==Roi.TRACED_ROI)
type = Roi.FREEROI;
roi2 = new PolygonRoi(poly.xpoints, poly.ypoints,poly.npoints, type);
}
roi2.copyAttributes(roi);
return roi2;
}
private static Roi rotateShape(ShapeRoi roi, double angle, double xcenter, double ycenter) {
Shape shape = roi.getShape();
AffineTransform at = new AffineTransform();
at.rotate(angle, xcenter, ycenter);
Rectangle r = roi.getBounds();
at.translate(r.x, r.y);
Shape shape2 = at.createTransformedShape(shape);
Roi roi2 = new ShapeRoi(shape2);
roi2.copyAttributes(roi);
return roi2;
}
}
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