Java tutorial
/* * Copyright (c) 2010, 2016, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package javafx.scene.shape; import com.sun.javafx.collections.TrackableObservableList; import com.sun.javafx.geom.BaseBounds; import com.sun.javafx.geom.Path2D; import com.sun.javafx.geom.transform.BaseTransform; import com.sun.javafx.scene.DirtyBits; import com.sun.javafx.scene.NodeHelper; import com.sun.javafx.scene.shape.PolygonHelper; import com.sun.javafx.scene.shape.ShapeHelper; import com.sun.javafx.sg.prism.NGNode; import com.sun.javafx.sg.prism.NGPolygon; import com.sun.javafx.sg.prism.NGShape; import javafx.collections.ListChangeListener.Change; import javafx.collections.ObservableList; import javafx.scene.Node; import javafx.scene.paint.Paint; /** * Creates a polygon, defined by an array of x,y coordinates. The Polygon * class is similar to the Polyline class, except that the Polyline class * is not automatically closed. * <PRE> import javafx.scene.shape.*; Polygon polygon = new Polygon(); polygon.getPoints().addAll(new Double[]{ 0.0, 0.0, 20.0, 10.0, 10.0, 20.0 }); </PRE> * @since JavaFX 2.0 */ public class Polygon extends Shape { static { PolygonHelper.setPolygonAccessor(new PolygonHelper.PolygonAccessor() { @Override public NGNode doCreatePeer(Node node) { return ((Polygon) node).doCreatePeer(); } @Override public void doUpdatePeer(Node node) { ((Polygon) node).doUpdatePeer(); } @Override public BaseBounds doComputeGeomBounds(Node node, BaseBounds bounds, BaseTransform tx) { return ((Polygon) node).doComputeGeomBounds(bounds, tx); } @Override public com.sun.javafx.geom.Shape doConfigShape(Shape shape) { return ((Polygon) shape).doConfigShape(); } }); } private final Path2D shape = new Path2D(); { // To initialize the class helper at the begining each constructor of this class PolygonHelper.initHelper(this); } /** * Creates an empty instance of Polygon. */ public Polygon() { } /** * Creates a new instance of Polygon. * @param points the coordinates of the polygon vertices */ public Polygon(double... points) { if (points != null) { for (double p : points) { this.getPoints().add(p); } } } /** * Defines the coordinates of the polygon vertices. * * @defaultValue empty */ private final ObservableList<Double> points = new TrackableObservableList<Double>() { @Override protected void onChanged(Change<Double> c) { NodeHelper.markDirty(Polygon.this, DirtyBits.NODE_GEOMETRY); NodeHelper.geomChanged(Polygon.this); } }; /** * Gets the coordinates of the {@code Polygon} vertices. * @return An observable list of vertices of this {@code Polygon} */ public final ObservableList<Double> getPoints() { return points; } /* * Note: This method MUST only be called via its accessor method. */ private NGNode doCreatePeer() { return new NGPolygon(); } /* * Note: This method MUST only be called via its accessor method. */ private BaseBounds doComputeGeomBounds(BaseBounds bounds, BaseTransform tx) { if (getMode() == NGShape.Mode.EMPTY || getPoints().size() <= 1) { return bounds.makeEmpty(); } if (getPoints().size() == 2) { if (getMode() == NGShape.Mode.FILL || getStrokeType() == StrokeType.INSIDE) { return bounds.makeEmpty(); } double upad = getStrokeWidth(); if (getStrokeType() == StrokeType.CENTERED) { upad /= 2.0f; } return computeBounds(bounds, tx, upad, 0.5f, getPoints().get(0), getPoints().get(1), 0.0f, 0.0f); } else { return computeShapeBounds(bounds, tx, ShapeHelper.configShape(this)); } } /* * Note: This method MUST only be called via its accessor method. */ private Path2D doConfigShape() { double p1 = getPoints().get(0); double p2 = getPoints().get(1); shape.reset(); shape.moveTo((float) p1, (float) p2); final int numValidPoints = getPoints().size() & ~1; for (int i = 2; i < numValidPoints; i += 2) { p1 = getPoints().get(i); p2 = getPoints().get(i + 1); shape.lineTo((float) p1, (float) p2); } shape.closePath(); return shape; } /* * Note: This method MUST only be called via its accessor method. */ private void doUpdatePeer() { if (NodeHelper.isDirty(this, DirtyBits.NODE_GEOMETRY)) { final int numValidPoints = getPoints().size() & ~1; float points_array[] = new float[numValidPoints]; for (int i = 0; i < numValidPoints; i++) { points_array[i] = (float) getPoints().get(i).doubleValue(); } final NGPolygon peer = NodeHelper.getPeer(this); peer.updatePolygon(points_array); } } /** * Returns a string representation of this {@code Polygon} object. * @return a string representation of this {@code Polygon} object. */ @Override public String toString() { final StringBuilder sb = new StringBuilder("Polygon["); String id = getId(); if (id != null) { sb.append("id=").append(id).append(", "); } sb.append("points=").append(getPoints()); sb.append(", fill=").append(getFill()); Paint stroke = getStroke(); if (stroke != null) { sb.append(", stroke=").append(stroke); sb.append(", strokeWidth=").append(getStrokeWidth()); } return sb.append("]").toString(); } }