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.geom.Arc2D; import com.sun.javafx.scene.DirtyBits; import com.sun.javafx.scene.NodeHelper; import com.sun.javafx.scene.shape.ArcHelper; import com.sun.javafx.sg.prism.NGArc; import com.sun.javafx.sg.prism.NGNode; import javafx.beans.property.DoubleProperty; import javafx.beans.property.DoublePropertyBase; import javafx.beans.property.ObjectProperty; import javafx.beans.property.ObjectPropertyBase; import javafx.scene.Node; import javafx.scene.paint.Paint; /** * The {@code Arc} class represents a 2D arc object, defined by a center point, * start angle (in degrees), angular extent (length of the arc in degrees), * and an arc type ({@link ArcType#OPEN}, {@link ArcType#CHORD}, * or {@link ArcType#ROUND}). * * <p>Example usage: the following code creates an Arc which is centered around * 50,50, has a radius of 25 and extends from the angle 45 to the angle 315 * (270 degrees long), and is round. * <PRE> import javafx.scene.shape.*; Arc arc = new Arc(); arc.setCenterX(50.0f); arc.setCenterY(50.0f); arc.setRadiusX(25.0f); arc.setRadiusY(25.0f); arc.setStartAngle(45.0f); arc.setLength(270.0f); arc.setType(ArcType.ROUND); </PRE> * @since JavaFX 2.0 */ public class Arc extends Shape { static { ArcHelper.setArcAccessor(new ArcHelper.ArcAccessor() { @Override public NGNode doCreatePeer(Node node) { return ((Arc) node).doCreatePeer(); } @Override public void doUpdatePeer(Node node) { ((Arc) node).doUpdatePeer(); } @Override public com.sun.javafx.geom.Shape doConfigShape(Shape shape) { return ((Arc) shape).doConfigShape(); } }); } private final Arc2D shape = new Arc2D(); { // To initialize the class helper at the begining each constructor of this class ArcHelper.initHelper(this); } /** * Creates an empty instance of Arc. */ public Arc() { } /** * Creates a new instance of Arc. * @param centerX the X coordinate of the center point of the arc * @param centerY the Y coordinate of the center point of the arc * @param radiusX the overall width (horizontal radius) of the full ellipse * of which this arc is a partial section * @param radiusY the overall height (vertical radius) of the full ellipse * of which this arc is a partial section * @param startAngle the starting angle of the arc in degrees * @param length the angular extent of the arc in degrees */ public Arc(double centerX, double centerY, double radiusX, double radiusY, double startAngle, double length) { setCenterX(centerX); setCenterY(centerY); setRadiusX(radiusX); setRadiusY(radiusY); setStartAngle(startAngle); setLength(length); } /** * Defines the X coordinate of the center point of the arc. * * @defaultValue 0.0 */ private DoubleProperty centerX; public final void setCenterX(double value) { if (centerX != null || value != 0.0) { centerXProperty().set(value); } } public final double getCenterX() { return centerX == null ? 0.0 : centerX.get(); } public final DoubleProperty centerXProperty() { if (centerX == null) { centerX = new DoublePropertyBase() { @Override public void invalidated() { NodeHelper.markDirty(Arc.this, DirtyBits.NODE_GEOMETRY); NodeHelper.geomChanged(Arc.this); } @Override public Object getBean() { return Arc.this; } @Override public String getName() { return "centerX"; } }; } return centerX; } /** * Defines the Y coordinate of the center point of the arc. * * @defaultValue 0.0 */ private DoubleProperty centerY; public final void setCenterY(double value) { if (centerY != null || value != 0.0) { centerYProperty().set(value); } } public final double getCenterY() { return centerY == null ? 0.0 : centerY.get(); } public final DoubleProperty centerYProperty() { if (centerY == null) { centerY = new DoublePropertyBase() { @Override public void invalidated() { NodeHelper.markDirty(Arc.this, DirtyBits.NODE_GEOMETRY); NodeHelper.geomChanged(Arc.this); } @Override public Object getBean() { return Arc.this; } @Override public String getName() { return "centerY"; } }; } return centerY; } /** * Defines the overall width (horizontal radius) of the full ellipse * of which this arc is a partial section. * * @defaultValue 0.0 */ private final DoubleProperty radiusX = new DoublePropertyBase() { @Override public void invalidated() { NodeHelper.markDirty(Arc.this, DirtyBits.NODE_GEOMETRY); NodeHelper.geomChanged(Arc.this); } @Override public Object getBean() { return Arc.this; } @Override public String getName() { return "radiusX"; } }; public final void setRadiusX(double value) { radiusX.set(value); } public final double getRadiusX() { return radiusX.get(); } public final DoubleProperty radiusXProperty() { return radiusX; } /** * Defines the overall height (vertical radius) of the full ellipse * of which this arc is a partial section. * * @defaultValue 0.0 */ private final DoubleProperty radiusY = new DoublePropertyBase() { @Override public void invalidated() { NodeHelper.markDirty(Arc.this, DirtyBits.NODE_GEOMETRY); NodeHelper.geomChanged(Arc.this); } @Override public Object getBean() { return Arc.this; } @Override public String getName() { return "radiusY"; } }; public final void setRadiusY(double value) { radiusY.set(value); } public final double getRadiusY() { return radiusY.get(); } public final DoubleProperty radiusYProperty() { return radiusY; } /** * Defines the starting angle of the arc in degrees. * * @defaultValue 0.0 */ private DoubleProperty startAngle; public final void setStartAngle(double value) { if (startAngle != null || value != 0.0) { startAngleProperty().set(value); } } public final double getStartAngle() { return startAngle == null ? 0.0 : startAngle.get(); } public final DoubleProperty startAngleProperty() { if (startAngle == null) { startAngle = new DoublePropertyBase() { @Override public void invalidated() { NodeHelper.markDirty(Arc.this, DirtyBits.NODE_GEOMETRY); NodeHelper.geomChanged(Arc.this); } @Override public Object getBean() { return Arc.this; } @Override public String getName() { return "startAngle"; } }; } return startAngle; } /** * Defines the angular extent of the arc in degrees. * * @defaultValue 0.0 */ private final DoubleProperty length = new DoublePropertyBase() { @Override public void invalidated() { NodeHelper.markDirty(Arc.this, DirtyBits.NODE_GEOMETRY); NodeHelper.geomChanged(Arc.this); } @Override public Object getBean() { return Arc.this; } @Override public String getName() { return "length"; } }; public final void setLength(double value) { length.set(value); } public final double getLength() { return length.get(); } public final DoubleProperty lengthProperty() { return length; } /** * Defines the closure type for the arc: * {@link ArcType#OPEN}, {@link ArcType#CHORD},or {@link ArcType#ROUND}. * * @defaultValue OPEN */ private ObjectProperty<ArcType> type; public final void setType(ArcType value) { if (type != null || value != ArcType.OPEN) { typeProperty().set(value); } } public final ArcType getType() { return type == null ? ArcType.OPEN : type.get(); } public final ObjectProperty<ArcType> typeProperty() { if (type == null) { type = new ObjectPropertyBase<ArcType>(ArcType.OPEN) { @Override public void invalidated() { NodeHelper.markDirty(Arc.this, DirtyBits.NODE_GEOMETRY); NodeHelper.geomChanged(Arc.this); } @Override public Object getBean() { return Arc.this; } @Override public String getName() { return "type"; } }; } return type; } /* * Note: This method MUST only be called via its accessor method. */ private NGNode doCreatePeer() { return new NGArc(); } /* * Note: This method MUST only be called via its accessor method. */ private Arc2D doConfigShape() { short tmpType; switch (getTypeInternal()) { case OPEN: tmpType = 0; break; case CHORD: tmpType = 1; break; default: tmpType = 2; break; } shape.setArc((float) (getCenterX() - getRadiusX()), // x (float) (getCenterY() - getRadiusY()), // y (float) (getRadiusX() * 2.0), // w (float) (getRadiusY() * 2.0), // h (float) getStartAngle(), (float) getLength(), tmpType); return shape; } private final ArcType getTypeInternal() { ArcType t = getType(); return t == null ? ArcType.OPEN : t; } /* * Note: This method MUST only be called via its accessor method. */ private void doUpdatePeer() { if (NodeHelper.isDirty(this, DirtyBits.NODE_GEOMETRY)) { final NGArc peer = NodeHelper.getPeer(this); peer.updateArc((float) getCenterX(), (float) getCenterY(), (float) getRadiusX(), (float) getRadiusY(), (float) getStartAngle(), (float) getLength(), getTypeInternal()); } } /** * Returns a string representation of this {@code Arc} object. * @return a string representation of this {@code Arc} object. */ @Override public String toString() { final StringBuilder sb = new StringBuilder("Arc["); String id = getId(); if (id != null) { sb.append("id=").append(id).append(", "); } sb.append("centerX=").append(getCenterX()); sb.append(", centerY=").append(getCenterY()); sb.append(", radiusX=").append(getRadiusX()); sb.append(", radiusY=").append(getRadiusY()); sb.append(", startAngle=").append(getStartAngle()); sb.append(", length=").append(getLength()); sb.append(", type=").append(getType()); 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(); } }