GridInitializer.h

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#ifndef GRID_INITIALIZER_H
#define GRID_INITIALIZER_H
 
#include "DocumentModelGridDisplay.h"
#include <QRectF>
 
class DocumentModelCoords;
class QSize;
 
class Transformation;

class GridInitializer
{
 public:
  GridInitializer();

  int computeCount (bool linearAxis,
                    double start,
                    double stop,
                    double step) const;

  double computeStart (bool linearAxis,
                       double stop,
                       double step,
                       int count) const;

  double computeStep (bool linearAxis,
                      double start,
                      double stop,
                      int count) const;

  double computeStop (bool linearAxis,
                      double start,
                      double step,
                      int count) const;

  DocumentModelGridDisplay initializeWithNarrowCoverage (const QPointF &boundingRectGraphMin,
                                                         const QPointF &boundingRectGraphMax,
                                                         const DocumentModelCoords &modelCoords) const;

  DocumentModelGridDisplay initializeWithWidePolarCoverage (const QPointF &boundingRectGraphMin,
                                                            const QPointF &boundingRectGraphMax,
                                                            const DocumentModelCoords &modelCoords,
                                                            const Transformation &transformation,
                                                            const QSize &imageSize) const;

  int valuePower (double value) const;
 
 private:
 
  // Given the min and max values on an axis, this method picks start, delta and stop
  // values that nicely bound the low and high values. Key in algorithm is to minimize
  // number of significant digits in start, delta and stop
  void axisScale (double xMin,
                  double xMax,
                  bool linearAxis,
                  double &xStart,
                  double &xStop,
                  double &xDelta,
                  int &count) const;
 
  void overridePolarCoordinateSettings (const DocumentModelCoords &modelCoords,
                                        const Transformation &transformation,
                                        DocumentModelGridDisplay &modelGridDisplay,
                                        const QSize &imageSize) const; // Adjust grid lines for polar coordinates
  double roundOffToPower (double arg,
                          int roundOffPower) const;
 
  const QRectF m_boundingRectGraph;
};
 
#endif // GRID_INITIALIZER_H