Исходный код

001/*
002 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.  Oracle designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Oracle in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
022 * or visit www.oracle.com if you need additional information or have any
023 * questions.
024 */
025
026package javafx.scene.shape;
027
028import java.util.Iterator;
029
030import javafx.beans.property.BooleanProperty;
031import javafx.beans.property.BooleanPropertyBase;
032import javafx.scene.Node;
033
034import com.sun.javafx.WeakReferenceQueue;
035import com.sun.javafx.geom.Path2D;
036import com.sun.javafx.sg.PGPath;
037
038
039/**
040 * The {@code PathElement} class represents an abstract element
041 * of the {@link Path} that can represent any geometric objects
042 * like straight lines, arcs, quadratic curves, cubic curves, etc.
043 */
044public abstract class PathElement {
045
046    /**
047     * Defines the sequence of {@code Path} objects this path element
048     * is attached to.
049     */
050    WeakReferenceQueue impl_nodes = new WeakReferenceQueue();
051
052    void addNode(final Node n) {
053        impl_nodes.add(n);
054    }
055
056    void removeNode(final Node n) {
057        impl_nodes.remove(n);
058    }
059
060    void u() {
061        final Iterator iterator = impl_nodes.iterator();
062        while (iterator.hasNext()) {
063            ((Path) iterator.next()).markPathDirty();
064        }
065    }
066
067    abstract void addTo(PGPath pgPath);
068
069    /**
070     * @treatAsPrivate implementation detail
071     * @deprecated This is an internal API that is not intended for use and will be removed in the next version
072     */
073    @Deprecated
074    public abstract void impl_addTo(Path2D path);
075    /**
076     * A flag that indicates whether the path coordinates are absolute or
077     * relative. A value of true indicates that the coordinates are absolute
078     * values. A value of false indicates that the values in this PathElement
079     * are added to the coordinates of the previous PathElement to compute the
080     * actual coordinates.
081     *
082     * @defaultValue true
083     */
084    private BooleanProperty absolute;
085
086
087    public final void setAbsolute(boolean value) {
088        absoluteProperty().set(value);
089    }
090
091    public final boolean isAbsolute() {
092        return absolute == null || absolute.get();
093    }
094
095    public final BooleanProperty absoluteProperty() {
096        if (absolute == null) {
097            absolute = new BooleanPropertyBase() {
098                @Override protected void invalidated() {
099                    u();
100                }
101
102                @Override
103                public Object getBean() {
104                    return PathElement.this;
105                }
106
107                @Override
108                public String getName() {
109                    return "absolute";
110                }
111            };
112        }
113        return absolute;
114    }
115}
116