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 BaseBounds doComputeGeomBounds(Node node,
75 BaseBounds bounds, BaseTransform tx) {
76 return ((Polygon) node).doComputeGeomBounds(bounds, tx);
77 }
78
79 @Override
80 public com.sun.javafx.geom.Shape doConfigShape(Shape shape) {
81 return ((Polygon) shape).doConfigShape();
82 }
83 });
84 }
85
86 private final Path2D shape = new Path2D();
87
88 {
89 // To initialize the class helper at the begining each constructor of this class
90 PolygonHelper.initHelper(this);
91 }
92
93 /**
94 * Creates an empty instance of Polygon.
95 */
96 public Polygon() {
97 }
98
99 /**
100 * Creates a new instance of Polygon.
101 * @param points the coordinates of the polygon vertices
102 */
103 public Polygon(double... points) {
104 if (points != null) {
105 for (double p : points) {
106 this.getPoints().add(p);
107 }
108 }
109 }
110
111 /**
112 * Defines the coordinates of the polygon vertices.
113 *
114 * @defaultValue empty
115 */
116 private final ObservableList<Double> points = new TrackableObservableList<Double>() {
117 @Override
118 protected void onChanged(Change<Double> c) {
119 NodeHelper.markDirty(Polygon.this, DirtyBits.NODE_GEOMETRY);
120 NodeHelper.geomChanged(Polygon.this);
121 }
122 };
123
124 /**
125 * Gets the coordinates of the {@code Polygon} vertices.
126 * @return An observable list of vertices of this {@code Polygon}
127 */
128 public final ObservableList<Double> getPoints() { return points; }
129
130 /*
131 * Note: This method MUST only be called via its accessor method.
132 */
133 private NGNode doCreatePeer() {
134 return new NGPolygon();
135 }
136
137 /*
138 * Note: This method MUST only be called via its accessor method.
139 */
140 private BaseBounds doComputeGeomBounds(BaseBounds bounds, BaseTransform tx) {
141 if (getMode() == NGShape.Mode.EMPTY || getPoints().size() <= 1) {
142 return bounds.makeEmpty();
143 }
144
145 if (getPoints().size() == 2) {
146 if (getMode() == NGShape.Mode.FILL || getStrokeType() == StrokeType.INSIDE) {
147 return bounds.makeEmpty();
148 }
149 double upad = getStrokeWidth();
150 if (getStrokeType() == StrokeType.CENTERED) {
151 upad /= 2.0f;
152 }
153 return computeBounds(bounds, tx, upad, 0.5f,
154 getPoints().get(0), getPoints().get(1), 0.0f, 0.0f);
155 } else {
156 return computeShapeBounds(bounds, tx, ShapeHelper.configShape(this));
157 }
158 }
159
160 /*
161 * Note: This method MUST only be called via its accessor method.
162 */
163 private Path2D doConfigShape() {
164 double p1 = getPoints().get(0);
165 double p2 = getPoints().get(1);
166 shape.reset();
167 shape.moveTo((float)p1, (float)p2);
168 final int numValidPoints = getPoints().size() & ~1;
169 for (int i = 2; i < numValidPoints; i += 2) {
170 p1 = getPoints().get(i); p2 = getPoints().get(i+1);
171 shape.lineTo((float)p1, (float)p2);
172 }
173 shape.closePath();
174 return shape;
175 }
176
177 /*
178 * Note: This method MUST only be called via its accessor method.
179 */
180 private void doUpdatePeer() {
181 if (NodeHelper.isDirty(this, DirtyBits.NODE_GEOMETRY)) {
182 final int numValidPoints = getPoints().size() & ~1;
183 float points_array[] = new float[numValidPoints];
184 for (int i = 0; i < numValidPoints; i++) {
185 points_array[i] = (float)getPoints().get(i).doubleValue();
186 }
187 final NGPolygon peer = NodeHelper.getPeer(this);
188 peer.updatePolygon(points_array);
189 }
190 }
191
192 /**
193 * Returns a string representation of this {@code Polygon} object.
194 * @return a string representation of this {@code Polygon} object.
195 */
196 @Override
197 public String toString() {
198 final StringBuilder sb = new StringBuilder("Polygon[");
199
200 String id = getId();
201 if (id != null) {
202 sb.append("id=").append(id).append(", ");
203 }
204
205 sb.append("points=").append(getPoints());
206
207 sb.append(", fill=").append(getFill());
208
209 Paint stroke = getStroke();
210 if (stroke != null) {
211 sb.append(", stroke=").append(stroke);
212 sb.append(", strokeWidth=").append(getStrokeWidth());
213 }
214
215 return sb.append("]").toString();
216 }
217 }
218