1 /*
   2  * Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.javafx.scene;
  27 
  28 import com.sun.javafx.geom.BaseBounds;
  29 import com.sun.javafx.geom.transform.BaseTransform;
  30 import com.sun.javafx.jmx.MXNodeAlgorithm;
  31 import com.sun.javafx.jmx.MXNodeAlgorithmContext;
  32 import com.sun.javafx.sg.prism.NGNode;
  33 import com.sun.javafx.util.Utils;
  34 import javafx.geometry.Point2D;
  35 import javafx.geometry.Point3D;
  36 import javafx.scene.Camera;
  37 import javafx.scene.Node;
  38 
  39 /**
  40  * Used to access internal methods of Camera.
  41  */
  42 public class CameraHelper extends NodeHelper {
  43 
  44     private static final CameraHelper theInstance;
  45     private static CameraAccessor cameraAccessor;
  46 
  47     static {
  48         theInstance = new CameraHelper();
  49         Utils.forceInit(Camera.class);
  50     }
  51 
  52     private static CameraHelper getInstance() {
  53         return theInstance;
  54     }
  55 
  56     public static void initHelper(Camera camera) {
  57         setHelper(camera, getInstance());
  58     }
  59 
  60     @Override
  61     protected NGNode createPeerImpl(Node node) {
  62         throw new UnsupportedOperationException("Applications should not extend the Camera class directly.");
  63     }
  64 
  65     @Override
  66     protected void updatePeerImpl(Node node) {
  67         super.updatePeerImpl(node);
  68         cameraAccessor.doUpdatePeer(node);
  69     }
  70 
  71     @Override
  72     protected void markDirtyImpl(Node node, DirtyBits dirtyBit) {
  73         super.markDirtyImpl(node, dirtyBit);
  74         cameraAccessor.doMarkDirty(node, dirtyBit);
  75     }
  76 
  77     @Override
  78     protected BaseBounds computeGeomBoundsImpl(Node node, BaseBounds bounds,
  79             BaseTransform tx) {
  80         return cameraAccessor.doComputeGeomBounds(node, bounds, tx);
  81     }
  82 
  83     @Override
  84     protected boolean computeContainsImpl(Node node, double localX, double localY) {
  85         return cameraAccessor.doComputeContains(node, localX, localY);
  86     }
  87 
  88     @Override
  89     protected Object processMXNodeImpl(Node node, MXNodeAlgorithm alg, MXNodeAlgorithmContext ctx) {
  90         return cameraAccessor.doProcessMXNode(node, alg, ctx);
  91     }
  92 
  93     public static Point2D project(Camera camera, Point3D p) {
  94         return cameraAccessor.project(camera, p);
  95     }
  96 
  97     public static Point2D pickNodeXYPlane(Camera camera, Node node, double x, double y) {
  98         return cameraAccessor.pickNodeXYPlane(camera, node, x, y);
  99     }
 100 
 101     public static Point3D pickProjectPlane(Camera camera, double x, double y) {
 102         return cameraAccessor.pickProjectPlane(camera, x, y);
 103     }
 104 
 105     public static void setCameraAccessor(final CameraAccessor newAccessor) {
 106         if (cameraAccessor != null) {
 107             throw new IllegalStateException();
 108         }
 109 
 110         cameraAccessor = newAccessor;
 111     }
 112 
 113     public interface CameraAccessor {
 114         void doMarkDirty(Node node, DirtyBits dirtyBit);
 115         void doUpdatePeer(Node node);
 116         BaseBounds doComputeGeomBounds(Node node, BaseBounds bounds, BaseTransform tx);
 117         boolean doComputeContains(Node node, double localX, double localY);
 118         Object doProcessMXNode(Node node, MXNodeAlgorithm alg, MXNodeAlgorithmContext ctx);
 119         Point2D project(Camera camera, Point3D p);
 120         Point2D pickNodeXYPlane(Camera camera, Node node, double x, double y);
 121         Point3D pickProjectPlane(Camera camera, double x, double y);
 122     }
 123 
 124 }