Examples of ptolemy.kernel.util.Location

ptolemy.kernel.util.Location
An attribute that represents a location of a node in a schematic.
By default, an instance of this class is not visible in a user interface. This is indicated to the user interface by returning NONE to the getVisibility() method. The location is specified by calling setExpression() with a string that has the form "x,y" or "[x,y]" or "{x,y}", where x and y can be parsed into doubles.
The default location is a two dimensional location with value {0.0, 0.0}. This class can also handle locations with greater than two dimensions. @author Steve Neuendorffer and Edward A. Lee @version $Id: Location.java,v 1.65 2007/12/06 21:56:23 cxh Exp $ @since Ptolemy II 2.1 @Pt.ProposedRating Green (cxh) @Pt.AcceptedRating Green (cxh)

     *  @exception IllegalActionException If the location attribute does
     *   not exist or cannot be evaluated.
     */
    protected double[] _getLocation() throws IllegalActionException {
        //Entity container = (Entity)this.getContainer();
        Location locationAttribute = (Location) getAttribute("_location",
                Location.class);


        if (locationAttribute == null) {
            throw new IllegalActionException(this,
                    "Cannot find a _location attribute of class Location.");
        }


        return locationAttribute.getLocation();
    }

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                if (portAttribute instanceof Locatable) {
                    portLocation = (Locatable) portAttribute;
                } else {
                    try {
                        portLocation = new Location(_port, "_location");
                        ((NamedObj) portLocation).propagateExistence();
                    } catch (KernelException ex) {
                        throw new InternalErrorException(ex);
                    }
                }

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        double[] locationValue = new double[2];
        locationValue[0] = _getDouble(attributes, "x", 0.0);
        locationValue[1] = _getDouble(attributes, "y", 0.0);


        try {
            Location location = new Location(attribute, "_location");
            location.setLocation(locationValue);


            // Since this isn't delegated to the MoML parser,
            // we have to handle propagation here.
            location.propagateExistence();
        } catch (KernelException e) {
            throw new InternalErrorException(e);
        }
    }

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                return locationList.get(0);
            } else {
                try {
                    // NOTE: We need the location right away, so we go ahead
                    // and create it and handle the propagation locally.
                    Location location = new Location(entity, "_location");
                    location.propagateExistence();
                    return location;
                } catch (Exception e) {
                    throw new InternalErrorException("Failed to create "
                            + "location, even though one does not exist:"
                            + e.getMessage());

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                // and create it. However, we also issue a MoMLChangeRequest
                // so that the change propagates, and any models that defer
                // to this one (e.g. subclasses) also have locations.
                // This is necessary so that if the location later moves,
                // then the move can be duplicated in the deferrers.
                Location location = new Location(object, "_location");


                // Since this isn't delegated to the MoML parser,
                // we have to handle propagation here.
                location.propagateExistence();


                return location;
            } catch (Exception e) {
                throw new InternalErrorException(object, e, "Failed to create "
                        + "location, even though one does not exist.");

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        _icon.setPersistent(false);


        // Create a location because, for some mysterious reason,
        // if there isn't one, then the icon is not shown in the
        // icon editor.
        new Location(this, "_location");


        // This must appear before lineColor or cloning could
        // fail if lineColor references it.
        _none = new Variable(this, "none");
        _none.setExpression("{1.0, 1.0, 1.0, 0.0}");

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            // NOTE: this gives at iteration over locations.
            Iterator nodes = model.nodes(composite);


            while (nodes.hasNext()) {
                Location location = (Location) nodes.next();


                // Get the containing element
                NamedObj element = location.getContainer();


                // Give default values in case the previous locations value
                // has not yet been set
                String expression = location.getExpression();


                if (expression == null) {
                    expression = "0, 0";
                }


                // Create the MoML, wrapping the location attribute
                // in an element refering to the container
                String containingElementName = element.getElementName();
                moml.append("<" + containingElementName + " name=\""
                        + element.getName() + "\" >\n");


                // NOTE: use the moml info element name here in case the
                // location is a vertex
                moml.append("<" + location.getElementName() + " name=\""
                        + location.getName() + "\" value=\"" + expression
                        + "\" />\n");
                moml.append("</" + containingElementName + ">\n");
            }


            moml.append("</group>\n");

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                "rectangle");
        rectangle.width.setExpression("155.0");
        rectangle.height.setExpression("20.0");
        rectangle.fillColor.setExpression("{1.0, 0.7, 0.7, 1.0}");


        Location _location = new Location(rectangle, "_location");
        _location.setExpression("-5.0, -15.0");


        TextAttribute text = new TextAttribute(_icon, "text");
        text.text.setExpression("DependencyHighlighter");
    }

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                "rectangle");
        rectangle.width.setExpression("120.0");
        rectangle.height.setExpression("20.0");
        rectangle.fillColor.setExpression("{0.2,1.0,1.0,1.0}");


        Location _location = new Location(rectangle, "_location");
        _location.setExpression("-5.0, -15.0");


        TextAttribute text = new TextAttribute(_icon, "text");
        text.text.setExpression("LocalPreferences");


        // Hide the name.

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                // and create it. However, we also issue a MoMLChangeRequest
                // so that the change propagates, and any models that defer
                // to this one (e.g. subclasses) also have locations.
                // This is necessary so that if the location later moves,
                // then the move can be duplicated in the deferrers.
                Location location = new Location(object, "_location");


                // Since this isn't delegated to the MoML parser,
                // we have to handle propagation here.
                location.propagateExistence();


                return location;
            } catch (Exception e) {
                throw new InternalErrorException("Failed to create "
                        + "location, even though one does not exist:"

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