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.sg.prism.NGNode;
  31 import com.sun.javafx.util.Utils;
  32 import javafx.geometry.Point2D;
  33 import javafx.geometry.Point3D;
  34 import javafx.scene.Camera;
  35 import javafx.scene.Node;
  36 
  37 /**
  38  * Used to access internal methods of Camera.
  39  */
  40 public class CameraHelper extends NodeHelper {
  41 
  42     private static final CameraHelper theInstance;
  43     private static CameraAccessor cameraAccessor;
  44 
  45     static {
  46         theInstance = new CameraHelper();
  47         Utils.forceInit(Camera.class);
  48     }
  49 
  50     private static CameraHelper getInstance() {
  51         return theInstance;
  52     }
  53 
  54     public static void initHelper(Camera camera) {
  55         setHelper(camera, getInstance());
  56     }
  57 
  58     @Override
  59     protected NGNode createPeerImpl(Node node) {
  60         throw new UnsupportedOperationException("Applications should not extend the Camera class directly.");
  61     }
  62 
  63     @Override
  64     protected void updatePeerImpl(Node node) {
  65         super.updatePeerImpl(node);
  66         cameraAccessor.doUpdatePeer(node);
  67     }
  68 
  69     @Override
  70     protected void markDirtyImpl(Node node, DirtyBits dirtyBit) {
  71         super.markDirtyImpl(node, dirtyBit);
  72         cameraAccessor.doMarkDirty(node, dirtyBit);
  73     }
  74 
  75     @Override
  76     protected BaseBounds computeGeomBoundsImpl(Node node, BaseBounds bounds,
  77             BaseTransform tx) {
  78         return cameraAccessor.doComputeGeomBounds(node, bounds, tx);
  79     }
  80 
  81     @Override
  82     protected boolean computeContainsImpl(Node node, double localX, double localY) {
  83         return cameraAccessor.doComputeContains(node, localX, localY);
  84     }
  85 
  86     public static Point2D project(Camera camera, Point3D p) {
  87         return cameraAccessor.project(camera, p);
  88     }
  89 
  90     public static Point2D pickNodeXYPlane(Camera camera, Node node, double x, double y) {
  91         return cameraAccessor.pickNodeXYPlane(camera, node, x, y);
  92     }
  93 
  94     public static Point3D pickProjectPlane(Camera camera, double x, double y) {
  95         return cameraAccessor.pickProjectPlane(camera, x, y);
  96     }
  97 
  98     public static void setCameraAccessor(final CameraAccessor newAccessor) {
  99         if (cameraAccessor != null) {
 100             throw new IllegalStateException();
 101         }
 102 
 103         cameraAccessor = newAccessor;
 104     }
 105 
 106     public interface CameraAccessor {
 107         void doMarkDirty(Node node, DirtyBits dirtyBit);
 108         void doUpdatePeer(Node node);
 109         BaseBounds doComputeGeomBounds(Node node, BaseBounds bounds, BaseTransform tx);
 110         boolean doComputeContains(Node node, double localX, double localY);
 111         Point2D project(Camera camera, Point3D p);
 112         Point2D pickNodeXYPlane(Camera camera, Node node, double x, double y);
 113         Point3D pickProjectPlane(Camera camera, double x, double y);
 114     }
 115 
 116 }