1 /*
   2  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package javafx.scene.shape;
  27 
  28 import com.sun.javafx.util.WeakReferenceQueue;
  29 import com.sun.javafx.geom.Path2D;
  30 import com.sun.javafx.sg.prism.NGPath;
  31 import javafx.beans.property.BooleanProperty;
  32 import javafx.beans.property.BooleanPropertyBase;
  33 import javafx.scene.Node;
  34 
  35 import java.util.Iterator;
  36 
  37 
  38 /**
  39  * The {@code PathElement} class represents an abstract element
  40  * of the {@link Path} that can represent any geometric objects
  41  * like straight lines, arcs, quadratic curves, cubic curves, etc.
  42  * @since JavaFX 2.0
  43  */
  44 public abstract class PathElement {
  45 
  46     /**
  47      * Defines the sequence of {@code Path} objects this path element
  48      * is attached to.
  49      */
  50     WeakReferenceQueue impl_nodes = new WeakReferenceQueue();
  51 
  52     void addNode(final Node n) {
  53         impl_nodes.add(n);
  54     }
  55 
  56     void removeNode(final Node n) {
  57         impl_nodes.remove(n);
  58     }
  59 
  60     void u() {
  61         final Iterator iterator = impl_nodes.iterator();
  62         while (iterator.hasNext()) {
  63             ((Path) iterator.next()).markPathDirty();
  64         }
  65     }
  66 
  67     abstract void addTo(NGPath pgPath);
  68 
  69     /**
  70      * @treatAsPrivate implementation detail
  71      * @deprecated This is an internal API that is not intended for use and will be removed in the next version
  72      */
  73     @Deprecated
  74     public abstract void impl_addTo(Path2D path);
  75     /**
  76      * A flag that indicates whether the path coordinates are absolute or
  77      * relative. A value of true indicates that the coordinates are absolute
  78      * values. A value of false indicates that the values in this PathElement
  79      * are added to the coordinates of the previous PathElement to compute the
  80      * actual coordinates.
  81      *
  82      * @defaultValue true
  83      */
  84     private BooleanProperty absolute;
  85 
  86 
  87     public final void setAbsolute(boolean value) {
  88         absoluteProperty().set(value);
  89     }
  90 
  91     public final boolean isAbsolute() {
  92         return absolute == null || absolute.get();
  93     }
  94 
  95     public final BooleanProperty absoluteProperty() {
  96         if (absolute == null) {
  97             absolute = new BooleanPropertyBase() {
  98                 @Override protected void invalidated() {
  99                     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