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.sg.prism.NGNode;
  29 import com.sun.javafx.util.Utils;
  30 import javafx.geometry.Point2D;
  31 import javafx.geometry.Point3D;
  32 import javafx.scene.Camera;
  33 import javafx.scene.Node;
  34 
  35 /**
  36  * Used to access internal methods of Camera.
  37  */
  38 public class CameraHelper extends NodeHelper {
  39 
  40     private static final CameraHelper theInstance;
  41     private static CameraAccessor cameraAccessor;
  42 
  43     static {
  44         theInstance = new CameraHelper();
  45         Utils.forceInit(Camera.class);
  46     }
  47 
  48     private static CameraHelper getInstance() {
  49         return theInstance;
  50     }
  51 
  52     public static void initHelper(Camera camera) {
  53         setHelper(camera, getInstance());
  54     }
  55 
  56     @Override
  57     protected NGNode createPeerImpl(Node node) {
  58         throw new UnsupportedOperationException("Application should not extend Camera class directly.");
  59     }
  60 
  61     @Override
  62     protected void updatePeerImpl(Node node) {
  63         super.updatePeerImpl(node);
  64         cameraAccessor.doUpdatePeer(node);
  65     }
  66 
  67     @Override
  68     protected void markDirtyImpl(Node node, DirtyBits dirtyBit) {
  69         super.markDirtyImpl(node, dirtyBit);
  70         cameraAccessor.doMarkDirty(node, dirtyBit);
  71     }
  72 
  73     public static Point2D project(Camera camera, Point3D p) {
  74         return cameraAccessor.project(camera, p);
  75     }
  76 
  77     public static Point2D pickNodeXYPlane(Camera camera, Node node, double x, double y) {
  78         return cameraAccessor.pickNodeXYPlane(camera, node, x, y);
  79     }
  80 
  81     public static Point3D pickProjectPlane(Camera camera, double x, double y) {
  82         return cameraAccessor.pickProjectPlane(camera, x, y);
  83     }
  84 
  85     public static void setCameraAccessor(final CameraAccessor newAccessor) {
  86         if (cameraAccessor != null) {
  87             throw new IllegalStateException();
  88         }
  89 
  90         cameraAccessor = newAccessor;
  91     }
  92 
  93     public interface CameraAccessor {
  94         void doMarkDirty(Node node, DirtyBits dirtyBit);
  95         void doUpdatePeer(Node node);
  96         Point2D project(Camera camera, Point3D p);
  97         Point2D pickNodeXYPlane(Camera camera, Node node, double x, double y);
  98         Point3D pickProjectPlane(Camera camera, double x, double y);
  99     }
 100 
 101 }