ValueScale Class Reference

The standard (1:1) mapping class for axis numbering. More...

#include <qwt3dScale.h>

Inheritance diagram for ValueScale:

Collaboration diagram for ValueScale:

Public Member Functions
QString	ticLabel (unsigned int idx) const

Protected Member Functions
int	autoscale (double &a, double &b, double start, double stop, int ivals)
	Applies LinearAutoScaler::execute() More...
void	calculate ()
	Creates the major and minor vector for the scale. More...
Qwt3D::Scale *	clone () const
	Returns a new heap based object utilized from qwt3d_ptr. More...

Protected Attributes
LinearAutoScaler2	autoscaler_p2

Friends
class	Qwt3D::Axis
class	Qwt3D::qwt3d_ptr< Qwt3D::Scale >

Detailed Description

The standard (1:1) mapping class for axis numbering.

Definition at line 33 of file qwt3dScale.h.

Member Function Documentation

int ValueScale::autoscale ( double &  a, double &  b, double  start, double  stop, int  ivals  )

protected

Applies LinearAutoScaler::execute()

Definition at line 34 of file qwt3dScale.cpp.

{
  return autoscaler_p2.execute2(a, b, start, stop, ivals);
}

void ValueScale::calculate ( )

protected

Creates the major and minor vector for the scale.

Definition at line 40 of file qwt3dScale.cpp.

{
  int i;
  int j;
  majors_p.clear();
  minors_p.clear();

  double interval = mstop_p - mstart_p;

  double runningval;

  // majors

  // first tic
  if (mstart_p < start_p || mstop_p > stop_p)
    return;

  majors_p.push_back(mstart_p);

  // remaining tics
  for (i = 1; i <= majorintervals_p; ++i)
    {
      double t = double(i) / majorintervals_p;
      runningval = mstart_p + t * interval;

      if (runningval > stop_p)
        break;

      if (isPracticallyZero(mstart_p, -t*interval)) // prevent rounding errors near 0
        runningval = 0.0;

      majors_p.push_back(runningval);
    }

  majorintervals_p = (int) majors_p.size();

  if (majorintervals_p)
    --majorintervals_p;

  // minors
  if (!majorintervals_p || !minorintervals_p) // no valid interval
    {
      minorintervals_p = 0;
      return;
    }

  // start_p      mstart_p
  //  |_____________|_____ _ _ _

  double step = (majors_p[1] - majors_p[0]) / minorintervals_p;

  if (isPracticallyZero(step))
    return;

  runningval = mstart_p - step;

  while (runningval > start_p)
    {
      minors_p.push_back(runningval);
      runningval -= step;
    }

  //       mstart_p            mstop_p
  //  ________|_____ _ _ _ _ _ ___|__________

  for (i = 0; i != majorintervals_p; ++i)
    {
      runningval = majors_p[i] + step;

      for (j = 0; j != minorintervals_p; ++j)
        {
          minors_p.push_back(runningval);
          runningval += step;
        }
    }

  //    mstop_p       stop_p
  // _ _ _|_____________|

  runningval = mstop_p + step;

  while (runningval < stop_p)
    {
      minors_p.push_back(runningval);
      runningval += step;
    }
}

Qwt3D::Scale* ValueScale::clone ( ) const

inlineprotected

Returns a new heap based object utilized from qwt3d_ptr.

Definition at line 40 of file qwt3dScale.h.

{return new ValueScale(*this);}

QString ValueScale::ticLabel

(

unsigned int

idx

)

const

Definition at line 128 of file qwt3dScale.cpp.

{
  if (idx < majors_p.size())
    {
      return QString::number(majors_p[idx]);
    }

  return QString("");
}

Friends And Related Function Documentation

friend class Qwt3D::Axis

friend

Definition at line 35 of file qwt3dScale.h.

friend class Qwt3D::qwt3d_ptr< Qwt3D::Scale >

friend

Definition at line 36 of file qwt3dScale.h.

Member Data Documentation

LinearAutoScaler2 ValueScale::autoscaler_p2

protected

Definition at line 42 of file qwt3dScale.h.

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

• qwt3dScale.h
• qwt3dScale.cpp