package org.opentrafficsim.draw.graphs;
   
   import java.awt.Color;
   
   import org.djunits.unit.LinearDensityUnit;
   import org.djunits.value.vdouble.scalar.LinearDensity;
   import org.opentrafficsim.core.dsol.OTSSimulatorInterface;
   import org.opentrafficsim.draw.core.BoundsPaintScale;
   import org.opentrafficsim.draw.graphs.ContourDataSource.ContourDataType;
  
  /**
   * Contour plot for density.
   * <p>
   * Copyright (c) 2013-2019 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="http://opentrafficsim.org/node/13">OpenTrafficSim License</a>.
   * <p>
   * @version $Revision$, $LastChangedDate$, by $Author$, initial version 10 okt. 2018 <br>
   * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
   * @author <a href="http://www.tudelft.nl/pknoppers">Peter Knoppers</a>
   * @author <a href="http://www.transport.citg.tudelft.nl">Wouter Schakel</a>
   */
  public class ContourPlotDensity extends AbstractContourPlot<LinearDensity>
  {
  
      /** */
      private static final long serialVersionUID = 20181010L;
  
      /**
       * Constructor.
       * @param caption String; caption
       * @param simulator OTSSimulatorInterface; simulator
       * @param dataPool ContourDataSource&lt;?&gt;; data pool
       */
      public ContourPlotDensity(final String caption, final OTSSimulatorInterface simulator, final ContourDataSource<?> dataPool)
      {
          super(caption, simulator, dataPool, createPaintScale(), new LinearDensity(30.0, LinearDensityUnit.PER_KILOMETER),
                  "%.0f/km", "density %.1f veh/km");
      }
  
      /**
       * Creates a paint scale from red, via yellow to green.
       * @return ContinuousColorPaintScale; paint scale
       */
      private static BoundsPaintScale createPaintScale()
      {
          double[] boundaries = { 0.0, 20.0 / 1000, 150.0 / 1000 };
          Color[] colorValues = BoundsPaintScale.GREEN_RED;
          return new BoundsPaintScale(boundaries, colorValues);
      }
  
      /** {@inheritDoc} */
      @Override
      public GraphType getGraphType()
      {
          return GraphType.DENSITY_CONTOUR;
      }
  
      /** {@inheritDoc} */
      @Override
      protected double scale(final double si)
      {
          return LinearDensityUnit.PER_KILOMETER.getScale().fromStandardUnit(si);
      }
  
      /** {@inheritDoc} */
      @Override
      protected double getValue(final int item, final double cellLength, final double cellSpan)
      {
          return getDataPool().getTotalTime(item) / (cellLength * cellSpan);
      }
  
      /** {@inheritDoc} */
      @Override
      protected ContourDataType<LinearDensity, ?> getContourDataType()
      {
          return null; // density is present by default
      }
  
      /** {@inheritDoc} */
      @Override
      public String toString()
      {
          return "ContourPlotDensity []";
      }
  
  }