Java tutorial
/* * Copyright (c) 2010, 2017, 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.effect; import javafx.beans.property.DoubleProperty; import javafx.beans.property.DoublePropertyBase; import javafx.beans.property.ObjectProperty; import javafx.scene.Node; import com.sun.javafx.util.Utils; import com.sun.javafx.effect.EffectDirtyBits; import com.sun.javafx.geom.BaseBounds; import com.sun.javafx.geom.transform.BaseTransform; import com.sun.javafx.scene.BoundsAccessor; /** * A motion blur effect using a Gaussian convolution kernel, with a * configurable radius and angle. * * <p> * Example: * <pre>{@code * MotionBlur motionBlur = new MotionBlur(); * motionBlur.setRadius(30); * motionBlur.setAngle(-15.0); * * Text text = new Text(); * text.setX(20.0); * text.setY(100.0); * text.setText("Motion!"); * text.setFill(Color.web("0x3b596d")); * text.setFont(Font.font(null, FontWeight.BOLD, 60)); * text.setEffect(motionBlur); * }</pre> * <p> * The code above produces the following: * </p> * <p> * <img src="doc-files/motionblur.png" alt="The visual effect of MotionBlur on text"> * </p> * @since JavaFX 2.0 */ public class MotionBlur extends Effect { /** * Creates a new instance of MotionBlur with default parameters. */ public MotionBlur() { } /** * Creates a new instance of MotionBlur with the specified angle and radius. * @param angle the angle of the motion effect, in degrees * @param radius the radius of the blur kernel * @since JavaFX 2.1 */ public MotionBlur(double angle, double radius) { setAngle(angle); setRadius(radius); } @Override com.sun.scenario.effect.MotionBlur createPeer() { return new com.sun.scenario.effect.MotionBlur(); }; /** * The input for this {@code Effect}. * If set to {@code null}, or left unspecified, a graphical image of * the {@code Node} to which the {@code Effect} is attached will be * used as the input. * @defaultValue null */ private ObjectProperty<Effect> input; public final void setInput(Effect value) { inputProperty().set(value); } public final Effect getInput() { return input == null ? null : input.get(); } public final ObjectProperty<Effect> inputProperty() { if (input == null) { input = new EffectInputProperty("input"); } return input; } @Override boolean checkChainContains(Effect e) { Effect localInput = getInput(); if (localInput == null) return false; if (localInput == e) return true; return localInput.checkChainContains(e); } /** * The radius of the blur kernel. * <pre> * Min: 0.0 * Max: 63.0 * Default: 10.0 * Identity: 0.0 * </pre> * @defaultValue 10.0 */ private DoubleProperty radius; public final void setRadius(double value) { radiusProperty().set(value); } public final double getRadius() { return radius == null ? 10 : radius.get(); } public final DoubleProperty radiusProperty() { if (radius == null) { radius = new DoublePropertyBase(10) { @Override public void invalidated() { markDirty(EffectDirtyBits.EFFECT_DIRTY); effectBoundsChanged(); } @Override public Object getBean() { return MotionBlur.this; } @Override public String getName() { return "radius"; } }; } return radius; } /** * The angle of the motion effect, in degrees. * <pre> * Min: n/a * Max: n/a * Default: 0.0 * Identity: n/a * </pre> * @defaultValue 0.0 */ private DoubleProperty angle; public final void setAngle(double value) { angleProperty().set(value); } public final double getAngle() { return angle == null ? 0 : angle.get(); } public final DoubleProperty angleProperty() { if (angle == null) { angle = new DoublePropertyBase() { @Override public void invalidated() { markDirty(EffectDirtyBits.EFFECT_DIRTY); effectBoundsChanged(); } @Override public Object getBean() { return MotionBlur.this; } @Override public String getName() { return "angle"; } }; } return angle; } private float getClampedRadius() { return (float) Utils.clamp(0, getRadius(), 63); } @Override void update() { Effect localInput = getInput(); if (localInput != null) { localInput.sync(); } com.sun.scenario.effect.MotionBlur peer = (com.sun.scenario.effect.MotionBlur) getPeer(); peer.setInput(localInput == null ? null : localInput.getPeer()); peer.setRadius(getClampedRadius()); peer.setAngle((float) Math.toRadians(getAngle())); } private int getHPad() { return (int) Math.ceil(Math.abs(Math.cos(Math.toRadians(getAngle()))) * getClampedRadius()); } private int getVPad() { return (int) Math.ceil(Math.abs(Math.sin(Math.toRadians(getAngle()))) * getClampedRadius()); } @Override BaseBounds getBounds(BaseBounds bounds, BaseTransform tx, Node node, BoundsAccessor boundsAccessor) { bounds = getInputBounds(bounds, BaseTransform.IDENTITY_TRANSFORM, node, boundsAccessor, getInput()); int hpad = getHPad(); int vpad = getVPad(); bounds = bounds.deriveWithPadding(hpad, vpad, 0); return transformBounds(tx, bounds); } @Override Effect copy() { MotionBlur mb = new MotionBlur(this.getAngle(), this.getRadius()); mb.setInput(mb.getInput()); return mb; } }