LogPlotZoomer Class Reference

#include <scrollzoomer.h>

Inheritance diagram for LogPlotZoomer:

Collaboration diagram for LogPlotZoomer:

Public Slots
virtual void	move (double x, double y)

Public Member Functions
	LogPlotZoomer (QwtPlotCanvas *canvas)

Protected Member Functions
virtual QwtText	trackerText (const QwtDoublePoint &pos) const

Detailed Description

Definition at line 39 of file scrollzoomer.h.

Constructor & Destructor Documentation

LogPlotZoomer::LogPlotZoomer

(

QwtPlotCanvas *

canvas

)

Definition at line 33 of file scrollzoomer.cpp.

                                                 :
  QwtPlotZoomer(canvas)
{}

Member Function Documentation

void LogPlotZoomer::move ( double  x, double  y  )

virtualslot

Definition at line 67 of file scrollzoomer.cpp.

Referenced by ScrollZoomer::scrollBarMoved().

{
  //QwtPlotZoomer::move(x,y);

  x = qwtMax(x, zoomBase().left());
  x = qwtMin(x, zoomBase().right() - zoomRect().width());

  y = qwtMax(y, zoomBase().top());
  y = qwtMin(y, zoomBase().bottom() - zoomRect().height());

  if (x != zoomRect().left() || y != zoomRect().top())
    {
      //zoomStack()[zoomRectIndex()].moveTo(x, y);
      QwtDoubleRect & rect = const_cast<QwtDoubleRect &>(zoomStack()[zoomRectIndex()]);

      //handle x axis
      const int xAxis = QwtPlotZoomer::xAxis();
      const QwtScaleEngine *sex = plot()->axisScaleEngine(xAxis);

      if (dynamic_cast<const QwtLog10ScaleEngine*>(sex))
        {
          //logarithmic
          double factor = rect.right() / rect.left();
          rect.setRight(x * factor);
          rect.setLeft(x);
        }
      else
        {
          rect.moveLeft(x);
        }

      const int yAxis = QwtPlotZoomer::yAxis();

      const QwtScaleEngine *sey = plot()->axisScaleEngine(yAxis);

      if (dynamic_cast<const QwtLog10ScaleEngine*>(sey))
        {
          //logarithmic
          double factor = rect.bottom() / rect.top();
          rect.setBottom(y * factor);
          rect.setTop(y);
        }
      else
        {
          rect.moveTop(y);
        }

      //zoomStack()[zoomRectIndex()].moveTo(x, y);
      rescale();
    }
}

QwtText LogPlotZoomer::trackerText ( const QwtDoublePoint &  pos ) const

protectedvirtual

Definition at line 37 of file scrollzoomer.cpp.

{
  switch (rubberBand())
    {
      case HLineRubberBand:
        return QString().sprintf("%.4g", pos.y());
      case VLineRubberBand:
        return QString().sprintf("%.4g", pos.x());
      default:
        return QString().sprintf("%.4g, %.4g", pos.x(), pos.y());
    }

  return QwtText(); // make some dumb compilers happy
}

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The documentation for this class was generated from the following files:

• scrollzoomer.h
• scrollzoomer.cpp