text: ///////////////////////////////////////////////////////////////////////////////
  // BSD 3-Clause License
  //
  // Copyright (c) 2019, The Regents of the University of California
  // All rights reserved.
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are met:
  //
  // * Redistributions of source code must retain the above copyright notice, this
  //   list of conditions and the following disclaimer.
  //
  // * Redistributions in binary form must reproduce the above copyright notice,
  //   this list of conditions and the following disclaimer in the documentation
  //   and/or other materials provided with the distribution.
  //
  // * Neither the name of the copyright holder nor the names of its
  //   contributors may be used to endorse or promote products derived from
  //   this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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  // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  // POSSIBILITY OF SUCH DAMAGE.
  
  #pragma once
  
  #include <QColor>
  
  namespace odb {
  class dbTechLayer;
  class dbNet;
  class dbInst;
  }  // namespace odb
  
  namespace gui {
  
  // This interface class provides access to the display options to
  // clients who are drawing.
  class Options
  {
   public:
    virtual ~Options() {}
    virtual QColor color(const odb::dbTechLayer* layer) = 0;
    virtual Qt::BrushStyle pattern(const odb::dbTechLayer* layer) = 0;
    virtual bool isVisible(const odb::dbTechLayer* layer) = 0;
    virtual bool isSelectable(const odb::dbTechLayer* layer) = 0;
    virtual bool isNetVisible(odb::dbNet* net) = 0;
    virtual bool isNetSelectable(odb::dbNet* net) = 0;
    virtual bool isInstanceVisible(odb::dbInst* inst) = 0;
    virtual bool isInstanceSelectable(odb::dbInst* inst) = 0;
    virtual bool areFillsVisible() = 0;
    virtual bool areRowsVisible() = 0;
    virtual bool arePrefTracksVisible() = 0;
    virtual bool areNonPrefTracksVisible() = 0;
  
    virtual bool isCongestionVisible() const = 0;
    virtual bool arePinMarkersVisible() const = 0;
    virtual bool showHorizontalCongestion() const = 0;
    virtual bool showVerticalCongestion() const = 0;
    virtual float getMinCongestionToShow() const = 0;
    virtual float getMaxCongestionToShow() const = 0;
    virtual QColor getCongestionColor(float congestion) const = 0;
  };
  
  }  // namespace gui
  