QwtPlotPiecewiseCurve Class Reference

A class which draws piecewise curves. More...

#include <qwt_plot_piecewise_curve.h>

Inheritance diagram for QwtPlotPiecewiseCurve:

Collaboration diagram for QwtPlotPiecewiseCurve:

Public Member Functions
	QwtPlotPiecewiseCurve ()
	QwtPlotPiecewiseCurve (QcepPlot *plot, const QwtText &title)
	QwtPlotPiecewiseCurve (QcepPlot *plot, const QString &title)
virtual QRectF	boundingRect () const
virtual void	drawSeries (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const

Private Member Functions
bool	ignorePoint (double x, double y) const
double	x (int n) const
double	y (int n) const

Static Private Member Functions
static bool	isNaN (double x)

Private Attributes
QcepPlot *	m_Plot

Detailed Description

A class which draws piecewise curves.

This class can be used to display data with missing (NaN) values as a piecewise curve in the x-y plane.

Definition at line 23 of file qwt_plot_piecewise_curve.h.

Constructor & Destructor Documentation

QwtPlotPiecewiseCurve::QwtPlotPiecewiseCurve ( )

explicit

Definition at line 14 of file qwt_plot_piecewise_curve.cpp.

                                            : QwtPlotCurve(),
    m_Plot(NULL)
{
}

QwtPlotPiecewiseCurve::QwtPlotPiecewiseCurve ( QcepPlot *  plot, const QwtText &  title  )

explicit

Definition at line 19 of file qwt_plot_piecewise_curve.cpp.

                                                                                :
    QwtPlotCurve(title),
    m_Plot(plot)
{
}

QwtPlotPiecewiseCurve::QwtPlotPiecewiseCurve ( QcepPlot *  plot, const QString &  title  )

explicit

Definition at line 25 of file qwt_plot_piecewise_curve.cpp.

                                                                                :
    QwtPlotCurve(title),
    m_Plot(plot)
{
}

Member Function Documentation

QRectF QwtPlotPiecewiseCurve::boundingRect ( ) const

virtual

Definition at line 79 of file qwt_plot_piecewise_curve.cpp.

References ignorePoint(), x(), and y().

{
  if (dataSize() <= 0) {
    return QRectF(1.0, 1.0, 2.0, 2.0); // Empty data.
  }

  size_t first = 0;
  while (first < dataSize() && ignorePoint(x(first),y(first))) {
    ++first;
  }

  if (first == dataSize()) {
    return QRectF(1.0, 1.0, 2.0, 2.0); // Empty data.
  }

  double minX, maxX, minY, maxY;
  minX = maxX = x(first);
  minY = maxY = y(first);
  for (size_t i = first + 1; i < dataSize(); ++i) {
    const double xv = x(i);
    const double yv = y(i);

    if (!ignorePoint(xv,yv)) {
      if (xv < minX)
        minX = xv;
      if (xv > maxX)
        maxX = xv;
      if (yv < minY)
        minY = yv;
      if (yv > maxY)
        maxY = yv;
    }
  }

  return QRectF(minX, minY, maxX - minX, maxY - minY);
}

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void QwtPlotPiecewiseCurve::drawSeries ( QPainter *  p, const QwtScaleMap &  xMap, const QwtScaleMap &  yMap, const QRectF &  canvasRect, int  from, int  to  ) const

virtual

Definition at line 51 of file qwt_plot_piecewise_curve.cpp.

References ignorePoint(), x(), and y().

{
  if (to < 0) {
    to = dataSize() - 1;
  }

  int first, last = from;
  while (last <= to) {
    first = last;
    while (first <= to && ignorePoint(x(first),y(first))) {
      ++first;
    }

    last = first;
    while (last <= to && !ignorePoint(x(last),y(last))) {
      ++last;
    }

    if (first <= to) {
      QwtPlotCurve::drawSeries(painter, xMap, yMap, canvasRect, first, last - 1);
    }
  }
}

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bool QwtPlotPiecewiseCurve::ignorePoint ( double  x, double  y  ) const

private

Definition at line 36 of file qwt_plot_piecewise_curve.cpp.

References isNaN(), QcepPlot::logAxis(), and m_Plot.

Referenced by boundingRect(), and drawSeries().

{
  if (isNaN(x)) return true;

  if (isNaN(y)) return true;

  if (m_Plot) {
    if (m_Plot->logAxis(xAxis()) && (x <= 0)) return true;
    if (m_Plot->logAxis(yAxis()) && (y <= 0)) return true;
  }

  return false;
}

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bool QwtPlotPiecewiseCurve::isNaN ( double  x )

staticprivate

Definition at line 31 of file qwt_plot_piecewise_curve.cpp.

References x().

Referenced by ignorePoint().

{
  return x != x;
}

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double QwtPlotPiecewiseCurve::x ( int  n ) const

private

Definition at line 116 of file qwt_plot_piecewise_curve.cpp.

Referenced by boundingRect(), drawSeries(), and isNaN().

{
  QPointF s = sample(n);

  return s.x();
}

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double QwtPlotPiecewiseCurve::y ( int  n ) const

private

Definition at line 123 of file qwt_plot_piecewise_curve.cpp.

Referenced by boundingRect(), and drawSeries().

{
  QPointF s = sample(n);

  return s.y();
}

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Member Data Documentation

QcepPlot* QwtPlotPiecewiseCurve::m_Plot

private

Definition at line 41 of file qwt_plot_piecewise_curve.h.

Referenced by ignorePoint().

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

• qwt_plot_piecewise_curve.h (Commit a65ccc9... : jennings : 2016-03-15 14:00:18 -0500)
• qwt_plot_piecewise_curve.cpp (Commit a65ccc9... : jennings : 2016-03-15 14:00:18 -0500)