ChartView.h++

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#ifndef __libquark_chart_ChartView_hxx
#define __libquark_chart_ChartView_hxx

#include <QAbstractItemModel>
#include <QFontMetrics>
#include <QPainter>
#include <QResizeEvent>
#include <QWidget>

#include <quark/Quark.h++>

namespace quark {
namespace chart {

class LIBQUARK_API ChartView : public QWidget
{
  Q_OBJECT;

  public:

  virtual ~ChartView();

  void setModel(QAbstractItemModel *model);
  QAbstractItemModel *model() const
  { return(_model); }

  Qt::Orientation orientation() const
  { return(_orientation); }
  qreal tickInterval() const
  { return(_tickInterval); }
  int precision() const
  { return(_precision); }

  public slots:

  void setOrientation(Qt::Orientation orientation);

  void setTickInterval(qreal tickInterval);

  void setPrecision(int precision);

  virtual bool isHorizontalOrientationSupported() const;
  virtual bool isVerticalOrientationSupported() const;

  protected:

  ChartView(QWidget *parent = NULL);

  int drawHorizontalScale(QPainter &painter, int y);
  int drawVerticalScale(QPainter &painter, int x);

  virtual bool hasScale() const = 0;
  virtual void getMinMaxValues(qreal &minValue, qreal &maxValue) const;

  void getMinMaxValuesPerSample(qreal &minValue, qreal &maxValue) const;
  void getMinMaxSumsPerSample(qreal &minSum, qreal &maxSum) const;

  qreal getSumForSample(int sample) const;
  qreal scale() const
  { return(_scale); }

  virtual void resizeEvent(QResizeEvent *event);

  virtual QString makeTickLabel(qreal value) const;

  int coordinateForValue(qreal value) const;

  static const int SCALE_GAP;
  static const int INSET;

  protected slots:

  virtual void dataChanged();

  private:

  static const int TICK_WIDTH;

  void recalculateScale();

  void drawVerticalTick(int y, qreal tick, QFontMetrics &fm,
                        QPainter &painter);
  void drawHorizontalTick(int x, qreal tick, QFontMetrics &fm,
                          QPainter &painter);

  Qt::Orientation _orientation;
  qreal _scale;
  qreal _tickInterval;
  int _precision;
  int _scaleWidth;
  int _zeroX;
  int _zeroY;
  QAbstractItemModel *_model;

  Q_DISABLE_COPY(ChartView)
};

} // namespace chart
} // namespace quark

#endif // __libquark_chart_ChartView_hxx