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/usr/include/Wt/Chart/WChart2DImplementation 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_WCHART2DIMPLEMENTATION_H
#define CHART_WCHART2DIMPLEMENTATION_H

#include <Wt/Chart/WCartesianChart>
#include <Wt/Chart/WAbstractChartImplementation>

namespace Wt {
  namespace Chart {

class ExtremesIterator : public SeriesIterator
{
public:
  ExtremesIterator(Axis axis, AxisScale scale)
    : axis_(axis), scale_(scale),
      minimum_(DBL_MAX),
      maximum_(-DBL_MAX)
  { }
  
  virtual bool startSeries(const WDataSeries& series, double groupWidth,
			   int numBarGroups, int currentBarGroup);
  
  virtual void newValue(const WDataSeries& series, double x, double y,
			double stackY, const WModelIndex& xIndex,
			const WModelIndex& yIndex);
  
  double minimum() { return minimum_; }
  double maximum() { return maximum_; }

private:
  Axis axis_;
  AxisScale scale_;
  double minimum_, maximum_;
};


class WChart2DImplementation : public WAbstractChartImplementation
{
public:
  WChart2DImplementation(WCartesianChart *chart);

  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 = XAxis) const;
  virtual RenderRange computeRenderRange(Axis axis, AxisScale scale) const;

  virtual void update();
  
private:
  WCartesianChart *chart_;
};

  }
}

#endif