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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2013, 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 com.sun.javafx.sg.prism;

import com.sun.javafx.geom.transform.Affine3D;
import com.sun.javafx.geom.transform.BaseTransform;
import com.sun.javafx.sg.BaseNode;
import com.sun.javafx.sg.PGGroup;
import com.sun.javafx.sg.PGLightBase;
import com.sun.prism.Graphics;
import com.sun.prism.paint.Color;

/**
 * TODO: 3D - Need documentation
 */
public class NGLightBase extends NGNode implements PGLightBase {

    private Color DEFAULT_COLOR = Color.WHITE;
    private Color color = DEFAULT_COLOR;
    private boolean lightOn = true;
    private Affine3D worldTransform;

    protected NGLightBase() {
    }

    @Override
    public void setTransformMatrix(BaseTransform tx) {
        super.setTransformMatrix(tx);
    }

    @Override
    protected void doRender(Graphics g) {}

    @Override protected void renderContent(Graphics g) {}

    @Override protected boolean hasOverlappingContents() {
        return false;
    }

    public Color getColor() {
        return color;
    }

    public void setColor(Object value) {
        if (value == null) { value = DEFAULT_COLOR; }
        if (!this.color.equals(value)) {
            this.color = (Color)value;
            visualsChanged();
        }
    }

    public boolean isLightOn() {
        return lightOn;
    }

    public void setLightOn(boolean value) {
        if (lightOn != value) {
            visualsChanged();
            lightOn = value;
        }
    }

    public Affine3D getWorldTransform() {
        return worldTransform;
    }

    public void setWorldTransform(Affine3D localToSceneTx) {
        // TODO: 3D worldTransform is reference to the FX light transform,
        // which is incorrect. Uncomment below to fix problem. Requires sync
        // to be called at the correct time by FX light
//        if (this.worldTransform == null ||
//                !this.worldTransform.equals(localToSceneTx)) {
//        this.worldTransform.setTransform(localToSceneTx);
//            visualsChanged();
//        }
        this.worldTransform = localToSceneTx;
    }

    Object scopedNodes[] = null;

    public void setScope(Object[] scopedNodes) {
        if (this.scopedNodes != scopedNodes) {
            this.scopedNodes = scopedNodes;
            visualsChanged();
        }
    }

    final boolean affects(NGShape3D n3d) {
        if (!lightOn) {
            return false;
        } else if (scopedNodes == null) {
            return true;
        } else {
            for (int i = 0; i < scopedNodes.length; i++) {
                Object scopedNode = scopedNodes[i];
                if (scopedNode instanceof PGGroup) {
                    BaseNode parent = n3d.getParent();
                    while (parent != null) {
                        if (scopedNode == parent) {
                            return true;
                        }
                        parent = parent.getParent();
                    }
                } else if (scopedNode == n3d) {
                    return true;
                }
            }
        }
        return false;
    }

    @Override
    public void release() {
        // TODO: 3D - Need to release native resources
    }
}