QwtCPointerData Class Reference

Data class containing two pointers to memory blocks of doubles. More...

#include <qwt_data.h>

Inheritance diagram for QwtCPointerData:

Collaboration diagram for QwtCPointerData:

List of all members.

Public Member Functions
	QwtCPointerData (const double *x, const double *y, vcl_size_t size)
QwtCPointerData &	operator= (const QwtCPointerData &)
	Assignment.
virtual QwtData *	copy () const
virtual vcl_size_t	size () const
virtual double	x (vcl_size_t i) const
virtual double	y (vcl_size_t i) const
const double *	xData () const
const double *	yData () const
virtual QwtDoubleRect	boundingRect () const

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Detailed Description

Data class containing two pointers to memory blocks of doubles.

Definition at line 144 of file qwt_data.h.

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Constructor & Destructor Documentation

QwtCPointerData::QwtCPointerData	(	const double *	x,
		const double *	y,
		vcl_size_t	size
	)

Constructor

Parameters:

x	Array of x values
y	Array of y values
size	Size of the x and y arrays

Warning:

The programmer must assure that the memory blocks referenced by the pointers remain valid during the lifetime of the QwtPlotCPointer object.

See also:

QwtPlotCurve::setData(), QwtPlotCurve::setRawData()

Definition at line 282 of file qwt_data.cpp.

Referenced by copy().

                                                  :
    d_x(x), 
    d_y(y), 
    d_size(size)
{
}

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Member Function Documentation

QwtDoubleRect QwtCPointerData::boundingRect

(

)

const [virtual]

Returns the bounding rectangle of the data. If there is no bounding rect, like for empty data the rectangle is invalid: QwtDoubleRect::isValid() == false

Reimplemented from QwtData.

Definition at line 355 of file qwt_data.cpp.

References size().

{
    const size_t sz = size();

    if ( sz <= 0 )
        return QwtDoubleRect(1.0, 1.0, -2.0, -2.0); // invalid

    double minX, maxX, minY, maxY;
    const double *xIt = d_x;
    const double *yIt = d_y;
    const double *end = d_x + sz;
    minX = maxX = *xIt++;
    minY = maxY = *yIt++;

    while ( xIt < end )
    {
        const double xv = *xIt++;
        if ( xv < minX )
            minX = xv;
        if ( xv > maxX )
            maxX = xv;

        const double yv = *yIt++;
        if ( yv < minY )
            minY = yv;
        if ( yv > maxY )
            maxY = yv;
    }
    return QwtDoubleRect(minX, minY, maxX - minX, maxY - minY);
}

QwtData * QwtCPointerData::copy

(

)

const [virtual]

Returns:

Pointer to a copy (virtual copy constructor)

Implements QwtData.

Definition at line 345 of file qwt_data.cpp.

References QwtCPointerData().

{
    return new QwtCPointerData(d_x, d_y, d_size);
}

QwtCPointerData & QwtCPointerData::operator=

(

const QwtCPointerData &

data )

Assignment.

Definition at line 291 of file qwt_data.cpp.

{
    if (this != &data)
    {
        d_x = data.d_x;
        d_y = data.d_y;
        d_size = data.d_size;
    }
    return *this;
}

vcl_size_t QwtCPointerData::size

(

)

const [virtual]

Returns:

Size of the data set

Implements QwtData.

Definition at line 303 of file qwt_data.cpp.

Referenced by boundingRect().

{   
    return d_size; 
}

double QwtCPointerData::x

(

vcl_size_t

i )

const [virtual]

Return the x value of data point i

Parameters:

i

Index

Returns:

x X value of data point i

Implements QwtData.

Definition at line 314 of file qwt_data.cpp.

References int().

{ 
    return d_x[int(i)]; 
}

const double * QwtCPointerData::xData

(

)

const

Returns:

Array of the x-values

Definition at line 331 of file qwt_data.cpp.

{
    return d_x;
}

double QwtCPointerData::y

(

vcl_size_t

i )

const [virtual]

Return the y value of data point i

Parameters:

i

Index

Returns:

y Y value of data point i

Implements QwtData.

Definition at line 325 of file qwt_data.cpp.

References int().

{ 
    return d_y[int(i)]; 
}

const double * QwtCPointerData::yData

(

)

const

Returns:

Array of the y-values

Definition at line 337 of file qwt_data.cpp.

{
    return d_y;
}

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

• qwt_data.h
• qwt_data.cpp