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/usr/include/Wt/Chart/WChart3DImplementation is in libwt-dev 3.3.3+dfsg-4.1.

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// This may look like C code, but it's really -*- C++ -*-
/*
 * Copyright (C) 2013 Emweb bvba, Leuven, Belgium.
 *
 * See the LICENSE file for terms of use.
 */

#ifndef CHART_WCHART3DIMPLEMENTATION_H
#define CHART_WCHART3DIMPLEMENTATION_H

#include <Wt/Chart/WAbstractChartImplementation>

namespace Wt {
  namespace Chart {

class WCartesian3DChart;

class WChart3DImplementation : public WAbstractChartImplementation
{
public:
  WChart3DImplementation(WCartesian3DChart *chart);
  // ~WChart3DImplementation() {}

  virtual ChartType chartType() const;
  virtual Orientation orientation() const;
  virtual int axisPadding() const;
  
  virtual int numberOfCategories(Axis axis = XAxis) const;
  virtual WString categoryLabel(int u, Axis axis) const;
  
  virtual RenderRange computeRenderRange(Axis axis, AxisScale scale = LinearScale) const;
  
  virtual void update();

private:
  WCartesian3DChart *chart_;
};

  }
}

#endif