From 7a2e20caac9db6f789a7b3fab344b9758af45335 Mon Sep 17 00:00:00 2001
From: Harvey Harrison <harvey.harrison@gmail.com>
Date: Sun, 19 Apr 2015 21:02:06 -0700
Subject: j3dcore: flatten the directory structure a bit

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
---
 src/javax/media/j3d/DistanceLOD.java | 310 +++++++++++++++++++++++++++++++++++
 1 file changed, 310 insertions(+)
 create mode 100644 src/javax/media/j3d/DistanceLOD.java

(limited to 'src/javax/media/j3d/DistanceLOD.java')

diff --git a/src/javax/media/j3d/DistanceLOD.java b/src/javax/media/j3d/DistanceLOD.java
new file mode 100644
index 0000000..244c06a
--- /dev/null
+++ b/src/javax/media/j3d/DistanceLOD.java
@@ -0,0 +1,310 @@
+/*
+ * Copyright 1997-2008 Sun Microsystems, Inc.  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.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package javax.media.j3d;
+
+import java.util.Enumeration;
+
+import javax.vecmath.Point3f;
+
+/**
+ * This class defines a distance-based LOD behavior node that operates on
+ * a Switch group node to select one of the children of that Switch node
+ * based on the distance of this LOD node from the viewer.
+ * An array of <i>n</i> monotonically increasing distance values is
+ * specified, such that distances[0] is associated with the highest level of
+ * detail and distances[<i>n</i>-1] is associated with the lowest level of
+ * detail.  Based on the actual distance from the viewer to
+ * this DistanceLOD node, these <i>n</i>
+ * distance values [0, <i>n</i>-1] select from among <i>n</i>+1
+ * levels of detail [0, <i>n</i>].  If <i>d</i> is the distance from
+ * the viewer to the LOD node, then the equation for determining
+ * which level of detail (child of the Switch node) is selected is:
+ * <p>
+ * <ul>
+ *     0, if <i>d</i> <= distances[0]
+ * <br>
+ *     <i>i</i>, if distances[<i>i</i>-1] < <i>d</i> <= distances[<i>i</i>]
+ * <br>
+ *     <i>n</i>, if d > distances[<i>n</i>-1]
+ * </ul>
+ * <p>
+ * Note that both the position and the array of distances are
+ * specified in the local coordinate system of this node.
+ */
+public class DistanceLOD extends LOD {
+
+    private double distances[];
+    private Point3f position = new Point3f(0.0f, 0.0f, 0.0f);
+
+    // variables for processStimulus
+    private Point3f center = new Point3f();
+    private Point3f viewPosition = new Point3f();
+
+    /**
+     * Constructs and initializes a DistanceLOD node with default values.
+     * Note that the default constructor creates a DistanceLOD object with
+     * a single distance value set to 0.0 and is, therefore, not useful.
+     */
+    public DistanceLOD() {
+	distances = new double[1];
+	distances[0] = 0.0;
+    }
+
+    /**
+     * Constructs and initializes a DistanceLOD node with the specified
+     * array of distances and a default position of (0,0,0).
+     * @param distances an array of values representing LOD cutoff distances
+     */
+    public DistanceLOD(float[] distances) {
+	this.distances = new double[distances.length];
+
+	for(int i=0;i<distances.length;i++) {
+ 	   this.distances[i] = (double)distances[i];
+        }
+    }
+
+    /**
+     * Constructs and initializes a DistanceLOD node with the specified
+     * array of distances and the specified position.
+     * @param distances an array of values representing LOD cutoff distances
+     * @param position the position of this LOD node
+     */
+    public DistanceLOD(float[] distances, Point3f position) {
+	this.distances = new double[distances.length];
+
+	for(int i=0;i<distances.length;i++) {
+ 	   this.distances[i] = (double)distances[i];
+        }
+	this.position.set(position);
+    }
+
+    /**
+     * Sets the position of this LOD node.  This position is specified in
+     * the local coordinates of this node, and is
+     * the position from which the distance to the viewer is computed.
+     * @param position the new position
+     */
+    public void setPosition(Point3f position) {
+	if (((NodeRetained)retained).staticTransform != null) {
+	    ((NodeRetained)retained).staticTransform.transform.transform(
+					position, this.position);
+	} else {
+	    this.position.set(position);
+	}
+    }
+
+    /**
+     * Retrieves the current position of this LOD node.  This position is
+     * in the local coordinates of this node.
+     * @param position the object that will receive the current position
+     */
+    public void getPosition(Point3f position) {
+        if (((NodeRetained)retained).staticTransform != null) {
+            Transform3D invTransform =
+                ((NodeRetained)retained).staticTransform.getInvTransform();
+            invTransform.transform(this.position, position);
+        } else {
+            position.set(this.position);
+        }
+    }
+
+    /**
+     * Returns a count of the number of LOD distance cut-off parameters.
+     * Note that the number of levels of detail (children of the Switch node)
+     * is one greater than the number of distance values.
+     * @return a count of the LOD cut-off distances
+     */
+    public int numDistances() {
+	return distances.length;
+    }
+
+    /**
+     * Returns a particular LOD cut-off distance.
+     * @param whichDistance an index specifying which LOD distance to return
+     * @return the cut-off distance value associated with the index provided
+     */
+    public double getDistance(int whichDistance) {
+	return distances[whichDistance];
+    }
+
+    /**
+     * Sets a particular LOD cut-off distance.
+     * @param whichDistance an index specifying which LOD distance to modify
+     * @param distance the cut-off distance associated with the index provided
+     */
+    public void setDistance(int whichDistance, double distance) {
+	     distances[whichDistance] = distance;
+    }
+
+    /**
+     * Initialize method that sets up initial wakeup criteria.
+     */
+    @Override
+    public void initialize() {
+	// Insert wakeup condition into queue
+	wakeupOn(wakeupFrame);
+    }
+
+    /**
+     * Process stimulus method that computes appropriate level of detail.
+     * @param criteria an enumeration of the criteria that caused the
+     * stimulus
+     */
+    @Override
+    public void processStimulus(Enumeration criteria) {
+
+
+	// compute distance in virtual world
+	View v = this.getView();
+	if( v == null ) {
+	    wakeupOn(wakeupFrame);
+	    return;
+	}
+
+	ViewPlatform vp = v.getViewPlatform();
+	if (vp == null) {
+	    return;
+	}
+
+	// Handle stimulus
+	double viewDistance = 0.0;
+	int nSwitches,i,index=0;
+
+	Transform3D localToWorldTrans = new Transform3D();
+
+        localToWorldTrans.set(((NodeRetained)this.retained).getCurrentLocalToVworld());
+
+
+	//  DistanceLOD's location in virutal world
+	localToWorldTrans.transform( position, center);
+
+
+	viewPosition.x = (float)((ViewPlatformRetained)vp.retained).schedSphere.center.x;
+	viewPosition.y = (float)((ViewPlatformRetained)vp.retained).schedSphere.center.y;
+	viewPosition.z = (float)((ViewPlatformRetained)vp.retained).schedSphere.center.z;
+	viewDistance = center.distance( viewPosition);
+
+
+	// convert distance into local coordinates
+	viewDistance = viewDistance/localToWorldTrans.getDistanceScale();
+
+	nSwitches = numSwitches();
+
+	index = distances.length; // viewDistance > distances[n-1]
+
+	if( viewDistance <= distances[0] ) {
+	    index = 0;
+	} else {
+	    for (i=1; i < distances.length; i++) {
+		if ((viewDistance > distances[i-1]) &&
+		    (viewDistance <= distances[i])) {
+		    index = i;
+		    break;
+		}
+	    }
+	}
+
+	for(i=nSwitches-1; i>=0; i--) {
+	    Switch sw = getSwitch(i);
+	    // Optimize, this behavior is passive
+	    // Note that we skip the capability check for getWhichChild()
+	    if (((SwitchRetained) sw.retained).getWhichChild() !=
+		index) {
+		sw.setWhichChild(index);
+	    }
+	}
+	// Insert wakeup condition into queue
+	wakeupOn(wakeupFrame);
+
+    }
+
+    /**
+     * Used to create a new instance of the node.  This routine is called
+     * by <code>cloneTree</code> to duplicate the current node.
+     * @param forceDuplicate when set to <code>true</code>, causes the
+     *  <code>duplicateOnCloneTree</code> flag to be ignored.  When
+     *  <code>false</code>, the value of each node's
+     *  <code>duplicateOnCloneTree</code> variable determines whether
+     *  NodeComponent data is duplicated or copied.
+     *
+     * @see Node#cloneTree
+     * @see Node#cloneNode
+     * @see Node#duplicateNode
+     * @see NodeComponent#setDuplicateOnCloneTree
+     */
+    @Override
+    public Node cloneNode(boolean forceDuplicate) {
+        DistanceLOD d = new DistanceLOD();
+        d.duplicateNode(this, forceDuplicate);
+        return d;
+    }
+
+
+   /**
+     * Copies all DistanceLOD information from
+     * <code>originalNode</code> into
+     * the current node.  This method is called from the
+     * <code>cloneNode</code> method which is, in turn, called by the
+     * <code>cloneTree</code> method.<P>
+     *
+     * @param originalNode the original node to duplicate.
+     * @param forceDuplicate when set to <code>true</code>, causes the
+     *  <code>duplicateOnCloneTree</code> flag to be ignored.  When
+     *  <code>false</code>, the value of each node's
+     *  <code>duplicateOnCloneTree</code> variable determines whether
+     *  NodeComponent data is duplicated or copied.
+     *
+     * @exception RestrictedAccessException if this object is part of a live
+     *  or compiled scenegraph.
+     *
+     * @see Node#duplicateNode
+     * @see Node#cloneTree
+     * @see NodeComponent#setDuplicateOnCloneTree
+     */
+    @Override
+    void duplicateAttributes(Node originalNode, boolean forceDuplicate) {
+        super.duplicateAttributes(originalNode, forceDuplicate);
+
+	DistanceLOD lod = (DistanceLOD) originalNode;
+
+        int numD = lod.numDistances();
+
+	// No API available to set the size of this array after initialize
+        this.distances = new double[numD];
+
+        for (int i = 0; i < numD; i++)
+            setDistance(i, lod.getDistance(i));
+
+        Point3f p = new Point3f();
+        lod.getPosition(p);
+        setPosition(p);
+    }
+
+    void mergeTransform(TransformGroupRetained xform) {
+	xform.transform.transform(position, position);
+    }
+}
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