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.BaseBounds; import com.sun.javafx.geom.Ellipse2D; 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.EllipseHelper; import com.sun.javafx.scene.shape.ShapeHelper; import com.sun.javafx.sg.prism.NGEllipse; import com.sun.javafx.sg.prism.NGNode; import com.sun.javafx.sg.prism.NGShape; import javafx.beans.property.DoubleProperty; import javafx.beans.property.DoublePropertyBase; import javafx.scene.Node; import javafx.scene.paint.Paint; /** * The {@code Ellipse} class creates a new ellipse * with the specified size and location in pixels * <PRE> import javafx.scene.shape.*; Ellipse ellipse = new Ellipse(); { ellipse.setCenterX(50.0f); ellipse.setCenterY(50.0f); ellipse.setRadiusX(50.0f); ellipse.setRadiusY(25.0f); </PRE> * @since JavaFX 2.0 */ public class Ellipse extends Shape { static { EllipseHelper.setEllipseAccessor(new EllipseHelper.EllipseAccessor() { @Override public NGNode doCreatePeer(Node node) { return ((Ellipse) node).doCreatePeer(); } @Override public void doUpdatePeer(Node node) { ((Ellipse) node).doUpdatePeer(); } @Override public BaseBounds doComputeGeomBounds(Node node, BaseBounds bounds, BaseTransform tx) { return ((Ellipse) node).doComputeGeomBounds(bounds, tx); } @Override public com.sun.javafx.geom.Shape doConfigShape(Shape shape) { return ((Ellipse) shape).doConfigShape(); } }); } private final Ellipse2D shape = new Ellipse2D(); private static final int NON_RECTILINEAR_TYPE_MASK = ~(BaseTransform.TYPE_TRANSLATION | BaseTransform.TYPE_QUADRANT_ROTATION | BaseTransform.TYPE_MASK_SCALE | BaseTransform.TYPE_FLIP); { // To initialize the class helper at the begining each constructor of this class EllipseHelper.initHelper(this); } /** * Creates an empty instance of Ellipse. */ public Ellipse() { } /** * Creates an instance of Ellipse of the given size. * @param radiusX the horizontal radius of the ellipse in pixels * @param radiusY the vertical radius of the ellipse in pixels */ public Ellipse(double radiusX, double radiusY) { setRadiusX(radiusX); setRadiusY(radiusY); } /** * Creates an instance of Ellipse of the given position and size. * @param centerX the horizontal position of the center of the ellipse in pixels * @param centerY the vertical position of the center of the ellipse in pixels * @param radiusX the horizontal radius of the ellipse in pixels * @param radiusY the vertical radius of the ellipse in pixels */ public Ellipse(double centerX, double centerY, double radiusX, double radiusY) { this(radiusX, radiusY); setCenterX(centerX); setCenterY(centerY); } /** * Defines the horizontal position of the center of the ellipse in pixels. * * @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(Ellipse.this, DirtyBits.NODE_GEOMETRY); NodeHelper.geomChanged(Ellipse.this); } @Override public Object getBean() { return Ellipse.this; } @Override public String getName() { return "centerX"; } }; } return centerX; } /** * Defines the vertical position of the center of the ellipse in pixels. * * @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(Ellipse.this, DirtyBits.NODE_GEOMETRY); NodeHelper.geomChanged(Ellipse.this); } @Override public Object getBean() { return Ellipse.this; } @Override public String getName() { return "centerY"; } }; } return centerY; } /** * Defines the width of the ellipse in pixels. * * @defaultValue 0.0 */ private final DoubleProperty radiusX = new DoublePropertyBase() { @Override public void invalidated() { NodeHelper.markDirty(Ellipse.this, DirtyBits.NODE_GEOMETRY); NodeHelper.geomChanged(Ellipse.this); } @Override public Object getBean() { return Ellipse.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 height of the ellipse in pixels. * * @defaultValue 0.0 */ private final DoubleProperty radiusY = new DoublePropertyBase() { @Override public void invalidated() { NodeHelper.markDirty(Ellipse.this, DirtyBits.NODE_GEOMETRY); NodeHelper.geomChanged(Ellipse.this); } @Override public Object getBean() { return Ellipse.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; } /* * Note: This method MUST only be called via its accessor method. */ private NGNode doCreatePeer() { return new NGEllipse(); } /** */ @Override StrokeLineJoin convertLineJoin(StrokeLineJoin t) { // The MITER join style can produce anomalous results for very thin or // very wide ellipses when the bezier curves that approximate the arcs // become so distorted that they shoot out MITER-like extensions. This // effect complicates matters because it makes the ellipses very non-round, // and also because it means we might have to pad the bounds to account // for this rare and unpredictable circumstance. // To avoid the problem, we set the Join style to BEVEL for any // ellipse. The BEVEL join style is more predictable for // anomalous angles and is the simplest join style to compute in // the stroking code. return StrokeLineJoin.BEVEL; } /* * Note: This method MUST only be called via its accessor method. */ private BaseBounds doComputeGeomBounds(BaseBounds bounds, BaseTransform tx) { // if there is no fill or stroke, then there are no bounds. The bounds // must be marked empty in this case to distinguish it from 0,0,0,0 // which would actually contribute to the bounds of a group. if (getMode() == NGShape.Mode.EMPTY) { return bounds.makeEmpty(); } if ((tx.getType() & NON_RECTILINEAR_TYPE_MASK) != 0) { return computeShapeBounds(bounds, tx, ShapeHelper.configShape(this)); } // compute the x, y, width and height of the ellipse final double x = getCenterX() - getRadiusX(); final double y = getCenterY() - getRadiusY(); final double width = 2.0f * getRadiusX(); final double height = 2.0f * getRadiusY(); double upad; double dpad; if (getMode() == NGShape.Mode.FILL || getStrokeType() == StrokeType.INSIDE) { upad = dpad = 0.0f; } else { upad = getStrokeWidth(); if (getStrokeType() == StrokeType.CENTERED) { upad /= 2.0f; } dpad = 0.0f; } return computeBounds(bounds, tx, upad, dpad, x, y, width, height); } /* * Note: This method MUST only be called via its accessor method. */ private Ellipse2D doConfigShape() { shape.setFrame((float) (getCenterX() - getRadiusX()), // x (float) (getCenterY() - getRadiusY()), // y (float) (getRadiusX() * 2.0), // w (float) (getRadiusY() * 2.0)); // h return shape; } /* * Note: This method MUST only be called via its accessor method. */ private void doUpdatePeer() { if (NodeHelper.isDirty(this, DirtyBits.NODE_GEOMETRY)) { NGEllipse peer = NodeHelper.getPeer(this); peer.updateEllipse((float) getCenterX(), (float) getCenterY(), (float) getRadiusX(), (float) getRadiusY()); } } /** * Returns a string representation of this {@code Ellipse} object. * @return a string representation of this {@code Ellipse} object. */ @Override public String toString() { final StringBuilder sb = new StringBuilder("Ellipse["); 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(", fill=").append(getFill()); Paint stroke = getStroke(); if (stroke != null) { sb.append(", stroke=").append(stroke); sb.append(", strokeWidth=").append(getStrokeWidth()); } return sb.append("]").toString(); } }