ROIGeometry extends ROI { @Override public ROI subtract(ROI roi) { try { final Geometry geom = getGeometry(roi); if (geom != null) { Geometry difference = theGeom.getGeometry().difference(geom); return buildROIGeometry(difference); } } catch(TopologyException e) { if(LOGGER.isLoggable(Level.FINE)) { LOGGER.log(Level.FINE, "Failed to perform operation using geometries, falling back on raster path", e); } } return super.subtract(roi); } ROIGeometry(Geometry geom);  ROIGeometry(Rectangle rect);  ROIGeometry(Geometry geom, final boolean useFixedPrecision);  ROIGeometry(Geometry geom, final boolean antiAliasing, final boolean useFixedPrecision);  ROIGeometry(Geometry geom, final RenderingHints hints);  ROIGeometry(Geometry geom, final boolean antiAliasing, 
            final boolean useFixedPrecision, final RenderingHints hints); @Override ROI add(ROI roi); @Override boolean contains(Point p); @Override boolean contains(Point2D p); @Override boolean contains(int x, int y); @Override boolean contains(double x, double y); @Override boolean contains(Rectangle rect); @Override boolean contains(Rectangle2D rect); @Override boolean contains(int x, int y, int w, int h); @Override boolean contains(double x, double y, double w, double h); @Override ROI exclusiveOr(ROI roi); @Override int[][] getAsBitmask(int x, int y, int width, int height, int[][] mask); @Override PlanarImage getAsImage(); @Override LinkedList getAsRectangleList(int x, int y, int width, int height); @Override Shape getAsShape(); Geometry getAsGeometry(); @Override Rectangle getBounds(); @Override Rectangle2D getBounds2D(); @Override int getThreshold(); @Override ROI intersect(ROI roi); @Override boolean intersects(Rectangle rect); @Override boolean intersects(Rectangle2D rect); @Override boolean intersects(int x, int y, int w, int h); @Override boolean intersects(double x, double y, double w, double h); @Override ROI performImageOp(RenderedImageFactory RIF, ParameterBlock paramBlock, int sourceIndex, RenderingHints renderHints); @Override ROI performImageOp(String name, ParameterBlock paramBlock, int sourceIndex, RenderingHints renderHints); @Override void setThreshold(int threshold); @Override ROI subtract(ROI roi); @Override ROI transform(AffineTransform at, Interpolation interp); @Override ROI transform(AffineTransform at); @Override String toString(); static final boolean DEFAULT_ROIGEOMETRY_ANTIALISING; static final boolean DEFAULT_ROIGEOMETRY_USEFIXEDPRECISION; }
@Test public void testSubtract() throws Exception { Point p1 = new GeometryFactory().createPoint(new Coordinate(10, 10)); Point p2 = new GeometryFactory().createPoint(new Coordinate(20, 10)); Geometry buffer1 = p1.buffer(15); Geometry buffer2 = p2.buffer(15); ROIGeometry rg1 = new ROIGeometry(buffer1); ROIGeometry rg2 = new ROIGeometry(buffer2); ROI rgSubtract = rg1.subtract(rg2); ROIShape rs1 = getEquivalentROIShape(rg1); ROIShape rs2 = getEquivalentROIShape(rg2); ROI rsSubtract = rs1.subtract(rs2); assertROIEquivalent(rgSubtract, rsSubtract, "Subtract"); }