/*
 *  Copyright 2011 RoboViz
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package rv.comm.drawing.annotations;

import java.nio.ByteBuffer;
import js.math.vector.Vec3f;
import rv.comm.drawing.commands.Command;
import rv.world.WorldModel;
import rv.world.objects.Agent;

/**
 * This is a special annotation type that is attached to an agent.
 */
public class AgentAnnotation extends Annotation {

    private static final Vec3f OFFSET = new Vec3f(0, 0.7f, 0);
    private final Agent        agent;

    @Override
    public float[] getPos() {
        if (agent.getPosition() == null)
            return new float[] { 0, 0, 0 };
        return agent.getPosition().plus(OFFSET).getVals();
    }

    public AgentAnnotation(String text, Agent agent, float[] color) {
        super(text, agent.getHeadCenter().getVals(), color, agent.getShortName() + ".Annotation");
        this.agent = agent;
        agent.setAnnotation(this);
    }

    public static AgentAnnotation parse(ByteBuffer buf, WorldModel world) {

        Agent agent = Command.readAgent(buf, world);
        float[] color = Command.readRGB(buf);
        String text = Command.getString(buf);

        if (agent == null)
            return null;
        return new AgentAnnotation(text, agent, color);
    }
}

@@ -1696,16 +1696,49 @@
 agent ==
+ null %7C%7C agent.getHeadCenter() ==
  null)%0A 

Fix potential null pointer exception when drawing agent annotations