1 /*
2 * Copyright (c) 2010, 2016, 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.collections.TrackableObservableList;
29 import com.sun.javafx.geom.BaseBounds;
30 import com.sun.javafx.geom.Path2D;
31 import com.sun.javafx.geom.transform.BaseTransform;
32 import com.sun.javafx.scene.DirtyBits;
33 import com.sun.javafx.scene.NodeHelper;
34 import com.sun.javafx.scene.shape.PolygonHelper;
35 import com.sun.javafx.scene.shape.ShapeHelper;
36 import com.sun.javafx.sg.prism.NGNode;
37 import com.sun.javafx.sg.prism.NGPolygon;
38 import com.sun.javafx.sg.prism.NGShape;
39 import javafx.collections.ListChangeListener.Change;
40 import javafx.collections.ObservableList;
41 import javafx.scene.Node;
42 import javafx.scene.paint.Paint;
43
44 /**
45 * Creates a polygon, defined by an array of x,y coordinates. The Polygon
46 * class is similar to the Polyline class, except that the Polyline class
47 * is not automatically closed.
48 *
49 <PRE>
50 import javafx.scene.shape.*;
51
52 Polygon polygon = new Polygon();
53 polygon.getPoints().addAll(new Double[]{
54 0.0, 0.0,
55 20.0, 10.0,
56 10.0, 20.0 });
57 </PRE>
58 * @since JavaFX 2.0
59 */
60 public class Polygon extends Shape {
61 static {
62 PolygonHelper.setPolygonAccessor(new PolygonHelper.PolygonAccessor() {
63 @Override
64 public NGNode doCreatePeer(Node node) {
65 return ((Polygon) node).doCreatePeer();
66 }
67
68 @Override
69 public void doUpdatePeer(Node node) {
70 ((Polygon) node).doUpdatePeer();
71 }
72
73 @Override
74 public com.sun.javafx.geom.Shape doConfigShape(Shape shape) {
75 return ((Polygon) shape).doConfigShape();
76 }
77 });
78 }
79
80 private final Path2D shape = new Path2D();
81
82 {
83 // To initialize the class helper at the begining each constructor of this class
84 PolygonHelper.initHelper(this);
85 }
86
87 /**
88 * Creates an empty instance of Polygon.
89 */
90 public Polygon() {
91 }
92
93 /**
94 * Creates a new instance of Polygon.
95 * @param points the coordinates of the polygon vertices
96 */
97 public Polygon(double... points) {
98 if (points != null) {
99 for (double p : points) {
100 this.getPoints().add(p);
101 }
102 }
103 }
104
105 /**
106 * Defines the coordinates of the polygon vertices.
107 *
108 * @defaultValue empty
109 */
110 private final ObservableList<Double> points = new TrackableObservableList<Double>() {
111 @Override
112 protected void onChanged(Change<Double> c) {
113 NodeHelper.markDirty(Polygon.this, DirtyBits.NODE_GEOMETRY);
114 impl_geomChanged();
115 }
116 };
117
118 /**
119 * Gets the coordinates of the {@code Polygon} vertices.
120 * @return An observable list of vertices of this {@code Polygon}
121 */
122 public final ObservableList<Double> getPoints() { return points; }
123
124 /*
125 * Note: This method MUST only be called via its accessor method.
126 */
127 private NGNode doCreatePeer() {
128 return new NGPolygon();
129 }
130
131 /**
132 * @treatAsPrivate implementation detail
133 * @deprecated This is an internal API that is not intended for use and will be removed in the next version
134 */
135 @Deprecated
136 public BaseBounds impl_computeGeomBounds(BaseBounds bounds, BaseTransform tx) {
137 if (getMode() == NGShape.Mode.EMPTY || getPoints().size() <= 1) {
138 return bounds.makeEmpty();
139 }
140
141 if (getPoints().size() == 2) {
142 if (getMode() == NGShape.Mode.FILL || getStrokeType() == StrokeType.INSIDE) {
143 return bounds.makeEmpty();
144 }
145 double upad = getStrokeWidth();
146 if (getStrokeType() == StrokeType.CENTERED) {
147 upad /= 2.0f;
148 }
149 return computeBounds(bounds, tx, upad, 0.5f,
150 getPoints().get(0), getPoints().get(1), 0.0f, 0.0f);
151 } else {
152 return computeShapeBounds(bounds, tx, ShapeHelper.configShape(this));
153 }
154 }
155
156 /*
157 * Note: This method MUST only be called via its accessor method.
158 */
159 private Path2D doConfigShape() {
160 double p1 = getPoints().get(0);
161 double p2 = getPoints().get(1);
162 shape.reset();
163 shape.moveTo((float)p1, (float)p2);
164 final int numValidPoints = getPoints().size() & ~1;
165 for (int i = 2; i < numValidPoints; i += 2) {
166 p1 = getPoints().get(i); p2 = getPoints().get(i+1);
167 shape.lineTo((float)p1, (float)p2);
168 }
169 shape.closePath();
170 return shape;
171 }
172
173 /*
174 * Note: This method MUST only be called via its accessor method.
175 */
176 private void doUpdatePeer() {
177 if (NodeHelper.isDirty(this, DirtyBits.NODE_GEOMETRY)) {
178 final int numValidPoints = getPoints().size() & ~1;
179 float points_array[] = new float[numValidPoints];
180 for (int i = 0; i < numValidPoints; i++) {
181 points_array[i] = (float)getPoints().get(i).doubleValue();
182 }
183 final NGPolygon peer = NodeHelper.getPeer(this);
184 peer.updatePolygon(points_array);
185 }
186 }
187
188 /**
189 * Returns a string representation of this {@code Polygon} object.
190 * @return a string representation of this {@code Polygon} object.
191 */
192 @Override
193 public String toString() {
194 final StringBuilder sb = new StringBuilder("Polygon[");
195
196 String id = getId();
197 if (id != null) {
198 sb.append("id=").append(id).append(", ");
199 }
200
201 sb.append("points=").append(getPoints());
202
203 sb.append(", fill=").append(getFill());
204
205 Paint stroke = getStroke();
206 if (stroke != null) {
207 sb.append(", stroke=").append(stroke);
208 sb.append(", strokeWidth=").append(getStrokeWidth());
209 }
210
211 return sb.append("]").toString();
212 }
213 }
214