package org.opentrafficsim.draw.road;
   
   import java.awt.Color;
   import java.awt.Graphics2D;
   import java.awt.geom.Path2D;
   import java.awt.image.ImageObserver;
   import java.rmi.RemoteException;
   
   import javax.naming.NamingException;
  
  import org.opentrafficsim.core.dsol.OtsSimulatorInterface;
  import org.opentrafficsim.core.geometry.DirectedPoint;
  import org.opentrafficsim.core.gtu.GtuGenerator.GtuGeneratorPosition;
  import org.opentrafficsim.draw.core.TextAlignment;
  import org.opentrafficsim.draw.core.TextAnimation;
  
  import nl.tudelft.simulation.dsol.animation.Locatable;
  import nl.tudelft.simulation.dsol.animation.D2.Renderable2D;
  import nl.tudelft.simulation.language.d2.Angle;
  
  /**
   * Animates a GtuGeneratorPosition.
   * <p>
   * Copyright (c) 2022-2023 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="https://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
   * </p>
   * @author <a href="https://github.com/averbraeck">Alexander Verbraeck</a>
   * @author <a href="https://tudelft.nl/staff/p.knoppers-1">Peter Knoppers</a>
   * @author <a href="https://dittlab.tudelft.nl">Wouter Schakel</a>
   */
  public class GtuGeneratorPositionAnimation extends Renderable2D<GtuGeneratorPosition>
  {
  
      /** */
      private static final long serialVersionUID = 20230204L;
      
      /** Chevron path to draw. */
      private static final Path2D.Float PATH;
  
      static
      {
          PATH = new Path2D.Float();
          addChevron(PATH, 0);
          addChevron(PATH, 1);
          addChevron(PATH, 2);
      }
  
      /**
       * Add chevron to drawing path.
       * @param path Path2D.Float; path.
       * @param number int; number of the chevron.
       */
      private static void addChevron(final Path2D.Float path, final int number)
      {
          float x = number * 1.5f;
          path.moveTo(x, -1.0);
          path.lineTo(x + 1.0, 0.0);
          path.lineTo(x, 1.0);
          path.lineTo(x + 0.75, 1.0);
          path.lineTo(x + 1.75, 0.0);
          path.lineTo(x + 0.75, -1.0);
          path.lineTo(x, -1.0);
      }
  
      /**
       * Constructor.
       * @param source GtuGeneratorPosition; source.
       * @param contextProvider OtsSimulatorInterface; simulator.
       * @throws NamingException when animation context cannot be created or retrieved
       * @throws RemoteException when remote context cannot be found
       */
      public GtuGeneratorPositionAnimation(final GtuGeneratorPosition source, final OtsSimulatorInterface contextProvider)
              throws RemoteException, NamingException
      {
          super(source, contextProvider);
          new Queue(source, contextProvider);
      }
  
      /** {@inheritDoc} */
      @Override
      public void paint(final Graphics2D graphics, final ImageObserver observer)
      {
          graphics.setColor(Color.BLUE);
          graphics.fill(PATH);
      }
  
      /**
       * Paints a queue counter with a GtuGeneratorPosition.
       * <p>
       * Copyright (c) 2022-2023 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved.
       * <br>
       * BSD-style license. See <a href="https://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
       * </p>
       * @author <a href="https://github.com/averbraeck">Alexander Verbraeck</a>
       * @author <a href="https://tudelft.nl/staff/p.knoppers-1">Peter Knoppers</a>
       * @author <a href="https://dittlab.tudelft.nl">Wouter Schakel</a>
       */
      public class Queue extends TextAnimation
      {
         /** */
         private static final long serialVersionUID = 20230204L;
 
         /**
          * Constructor.
          * @param source Locatable; source.
          * @param simulator OtsSimulatorInterface; simulator.
          * @throws NamingException when animation context cannot be created or retrieved
          * @throws RemoteException when remote context cannot be found
          */
         public Queue(final Locatable source, final OtsSimulatorInterface simulator) throws RemoteException, NamingException
         {
             super(source, "", 0.0f, 0.0f, TextAlignment.CENTER, Color.BLACK, 3.0f, 12.0f, 50f, simulator, null,
                     TextAnimation.RENDERALWAYS);
         }
         
         /** {@inheritDoc} */
         @Override
         @SuppressWarnings("checkstyle:designforextension")
         public DirectedPoint getLocation()
         {
             // draw always on top, and not upside down.
             DirectedPoint p = super.getLocation();
             double a = Angle.normalizePi(p.getRotZ());
             if (a > Math.PI / 2.0 || a < -0.99 * Math.PI / 2.0)
             {
                 a += Math.PI;
             }
             return new DirectedPoint(p.x, p.y, Double.MAX_VALUE, 0.0, 0.0, a);
         }
 
         /** {@inheritDoc} */
         @Override
         public void paint(final Graphics2D graphics, final ImageObserver observer)
         {
             setText(Integer.toString(((GtuGeneratorPosition) getSource()).getQueueCount()));
             super.paint(graphics, observer);
         }
     }
 
 }