private static final Insets zeroInsets = new Insets(0, 0, 0, 0);

		private final ApplicationContext act;;

		public GuiUtil(final ApplicationContext act) {
			this.act = act;
		}

		/**
		 * Create a simple about box JDialog that displays the standard
		 * Application resources, like {@code Application.title} and
		 * {@code Application.description}. The about box's labels and fields
		 * are configured by resources that are injected when the about box is
		 * shown (see SingleFrameApplication#show). The resources are defined in
		 * the application resource file: resources/DocumentExample.properties.
		 * 
		 * From:
		 * https://appframework.dev.java.net/downloads/AppFramework-1.03-src.zip
		 * DocumentExample
		 */
		private JDialog createAboutBox(final Frame owner) {
			final JPanel panel = new JPanel(new GridBagLayout());
			panel.setBorder(new EmptyBorder(0, 28, 16, 28)); // top, left,
			// bottom, right
			final JLabel titleLabel = new JLabel();
			titleLabel.setName("aboutTitleLabel");
			final GridBagConstraints c = new GridBagConstraints();
			initGridBagConstraints(c);
			c.anchor = GridBagConstraints.WEST;
			c.gridwidth = GridBagConstraints.REMAINDER;
			c.fill = GridBagConstraints.HORIZONTAL;
			c.ipady = 32;
			c.weightx = 1.0;
			panel.add(titleLabel, c);
			final String[] fields = { "description", "version", "vendor",
					"home" };
			for (final String field : fields) {
				final JLabel label = new JLabel();
				label.setName(field + "Label");
				initGridBagConstraints(c);
				// c.anchor = GridBagConstraints.BASELINE_TRAILING; 1.6 ONLY
				c.anchor = GridBagConstraints.EAST;
				panel.add(label, c);
				initGridBagConstraints(c);
				c.weightx = 1.0;
				c.gridwidth = GridBagConstraints.REMAINDER;
				c.fill = GridBagConstraints.HORIZONTAL;
				final JTextField textField = new JTextField();
				textField.setName(field + "TextField");
				textField.setEditable(false);
				textField.setBorder(null);
				panel.add(textField, c);
			}
			final JButton closeAboutButton = new JButton();
			closeAboutButton.setAction(findAction("closeAboutBox"));
			initGridBagConstraints(c);
			c.anchor = GridBagConstraints.EAST;
			c.gridx = 1;
			panel.add(closeAboutButton, c);
			final JDialog dialog = new JDialog(owner);
			dialog.setName("aboutDialog");
			dialog.add(panel, BorderLayout.CENTER);
			return dialog;
		}

		private JFileChooser createFileChooser(final File base,
				final String resourceName, final FileFilter filter) {
			final JFileChooser fc = new JFileChooser(base);
			fc.setName(resourceName);
			fc.setMultiSelectionEnabled(false);
			fc.setAcceptAllFileFilterUsed(true);
			fc.setFileFilter(filter);
			getContext().getResourceMap().injectComponents(fc);
			return fc;
		}

		private FileNameExtensionFilter createFileFilter(
				final String resourceName, final String... extensions) {
			final ResourceMap appResourceMap = getContext().getResourceMap();
			final String key = resourceName + ".description";
			final String desc = appResourceMap.getString(key);
			return new FileNameExtensionFilter(desc == null ? key : desc,
					extensions);
		}

		private JMenu createMenu(final String menuName,
				final String[] actionNames) {

	}

	@Override
	public void setChanger(final ChangeManager changer) {
		super.setChanger(changer);
		broom.setChanger(changer);
	}

	@Override
	public void setCurves(final ComputedTrajectorySet curves) {
		// rocks.setVisible(model != null);
		if (this.curves != null) {
			removeCL(this.curves.getInitialPos());
			removeCL(this.curves.getCurrentPos());
		}
		this.curves = curves;
		r2n.clear();
		if (this.curves != null) {
			final RockSet<Pos> ip = this.curves.getInitialPos();
			final RockSet<Pos> cp = this.curves.getCurrentPos();
			addCL(ip);
			addCL(cp);
			for (int i16 = RockSet.ROCKS_PER_SET - 1; i16 >= 0; i16--) {
				syncM2V(ip, i16, initial[i16]);
				syncM2V(cp, i16, current[i16]);
				syncM2V(getCurves(), i16, path, tf);
			}
		}
		tt.init(this.curves);
		rocks.setVisible(this.curves != null);
	}

	public void setZoom(final RectangularShape viewport,

					menuItem.setAction(findAction(actionName));
					menuItem.setIcon(null);
					menu.add(menuItem);
				}
			return menu;
		}

		private File ensureSuffix(final File dst,
				final FileNameExtensionFilter pat) {
			if (pat.accept(dst))
				return dst;
			return new File(dst.getAbsoluteFile() + "."
					+ pat.getExtensions()[0]);
		}

		private javax.swing.Action findAction(final String actionName) {
			return getContext().getActionMap().get(actionName);
		};

		public ApplicationContext getContext() {
			return act;
		};

		private void initGridBagConstraints(final GridBagConstraints c) {
			c.anchor = GridBagConstraints.CENTER;
			c.fill = GridBagConstraints.NONE;
			c.gridwidth = 1;
			c.gridheight = 1;
			c.gridx = GridBagConstraints.RELATIVE;
			c.gridy = GridBagConstraints.RELATIVE;
			c.insets = zeroInsets;
			c.ipadx = 4; // not the usual default
			c.ipady = 4; // not the usual default
			c.weightx = 0.0;
			c.weighty = 0.0;
		};
	}

	private static final Rectangle2D TwelvePlus;
	static {
		final double r2 = 2 * RockProps.DEFAULT.getRadius();
		final double x = IceSize.SIDE_2_CENTER + r2;
		HousePlus = new Rectangle2D.Double(-x, -(IceSize.HOG_2_TEE + r2),
				2 * x, IceSize.HOG_2_TEE + IceSize.BACK_2_TEE + 3 * r2 + 2 * r2);
		final double c12 = r2 + Unit.f2m(6.0);
		TwelvePlus = new Rectangle2D.Double(-c12, -c12, 2 * c12, 2 * c12);