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.Path2D; import com.sun.javafx.scene.shape.QuadCurveToHelper; import com.sun.javafx.sg.prism.NGPath; import javafx.beans.property.DoubleProperty; import javafx.beans.property.DoublePropertyBase; /** * Creates a curved path element, defined by two new points, * by drawing a Quadratic Bézier curve that intersects both the current coordinates * and the specified coordinates {@code (x, y)}, * using the specified point {@code (controlX, controlY)} * as a Bézier control point. * All coordinates are specified in double precision. * * <p>For more information on path elements see the {@link Path} and * {@link PathElement} classes. * * <p>Example: * <PRE> import javafx.scene.shape.*; Path path = new Path(); MoveTo moveTo = new MoveTo(); moveTo.setX(0.0f); moveTo.setY(50.0f); QuadCurveTo quadTo = new QuadCurveTo(); quadTo.setControlX(25.0f); quadTo.setControlY(0.0f); quadTo.setX(50.0f); quadTo.setY(50.0f); path.getElements().add(moveTo); path.getElements().add(cubicTo); </PRE> * @since JavaFX 2.0 */ public class QuadCurveTo extends PathElement { static { QuadCurveToHelper.setQuadCurveToAccessor(new QuadCurveToHelper.QuadCurveToAccessor() { @Override public void doAddTo(PathElement pathElement, Path2D path) { ((QuadCurveTo) pathElement).doAddTo(path); } }); } /** * Creates an empty instance of QuadCurveTo. */ public QuadCurveTo() { QuadCurveToHelper.initHelper(this); } /** * Creates a new instance of QuadCurveTo. * @param controlX the X coordinate of the quadratic control point * @param controlY the Y coordinate of the quadratic control point * @param x the X coordinate of the final end point * @param y the Y coordinate of the final end point */ public QuadCurveTo(double controlX, double controlY, double x, double y) { setControlX(controlX); setControlY(controlY); setX(x); setY(y); QuadCurveToHelper.initHelper(this); } /** * Defines the X coordinate of the quadratic control point. * * @defaultValue 0.0 */ private DoubleProperty controlX = new DoublePropertyBase() { @Override public void invalidated() { u(); } @Override public Object getBean() { return QuadCurveTo.this; } @Override public String getName() { return "controlX"; } }; public final void setControlX(double value) { controlX.set(value); } public final double getControlX() { return controlX.get(); } public final DoubleProperty controlXProperty() { return controlX; } /** * Defines the Y coordinate of the quadratic control point. * * @defaultValue 0.0 */ private DoubleProperty controlY = new DoublePropertyBase() { @Override public void invalidated() { u(); } @Override public Object getBean() { return QuadCurveTo.this; } @Override public String getName() { return "controlY"; } }; public final void setControlY(double value) { controlY.set(value); } public final double getControlY() { return controlY.get(); } public final DoubleProperty controlYProperty() { return controlY; } /** * Defines the X coordinate of the final end point. * * @defaultValue 0.0 */ private DoubleProperty x; public final void setX(double value) { if (x != null || value != 0.0) { xProperty().set(value); } } public final double getX() { return x == null ? 0.0 : x.get(); } public final DoubleProperty xProperty() { if (x == null) { x = new DoublePropertyBase() { @Override public void invalidated() { u(); } @Override public Object getBean() { return QuadCurveTo.this; } @Override public String getName() { return "x"; } }; } return x; } /** * Defines the Y coordinate of the final end point. * * @defaultValue 0.0 */ private DoubleProperty y; public final void setY(double value) { if (y != null || value != 0.0) { yProperty().set(value); } } public final double getY() { return y == null ? 0.0 : y.get(); } public final DoubleProperty yProperty() { if (y == null) { y = new DoublePropertyBase() { @Override public void invalidated() { u(); } @Override public Object getBean() { return QuadCurveTo.this; } @Override public String getName() { return "y"; } }; } return y; } @Override void addTo(NGPath pgPath) { if (isAbsolute()) { pgPath.addQuadTo((float) getControlX(), (float) getControlY(), (float) getX(), (float) getY()); } else { final double dx = pgPath.getCurrentX(); final double dy = pgPath.getCurrentY(); pgPath.addQuadTo((float) (getControlX() + dx), (float) (getControlY() + dy), (float) (getX() + dx), (float) (getY() + dy)); } } /* * Note: This method MUST only be called via its accessor method. */ private void doAddTo(Path2D path) { if (isAbsolute()) { path.quadTo((float) getControlX(), (float) getControlY(), (float) getX(), (float) getY()); } else { final double dx = path.getCurrentX(); final double dy = path.getCurrentY(); path.quadTo((float) (getControlX() + dx), (float) (getControlY() + dy), (float) (getX() + dx), (float) (getY() + dy)); } } /** * Returns a string representation of this {@code CubicCurveTo} object. * @return a string representation of this {@code CubicCurveTo} object. */ @Override public String toString() { final StringBuilder sb = new StringBuilder("CubicCurveTo["); sb.append("x=").append(getX()); sb.append(", y=").append(getY()); sb.append(", controlX=").append(getControlX()); sb.append(", controlY=").append(getControlY()); return sb.append("]").toString(); } }