.TH "QwtData" 3 "Tue Nov 20 2012" "Version 5.2.3" "Qwt User's Guide" \" -*- nroff -*-
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.SH NAME
QwtData \- 
.SH SYNOPSIS
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.PP
.PP
\fC#include <qwt_data\&.h>\fP
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Inherited by \fBQwtArrayData\fP, \fBQwtCPointerData\fP, and \fBQwtPolygonFData\fP\&.
.SS "Public Member Functions"

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.RI "\fBQwtData\fP ()"
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.RI "virtual \fB~QwtData\fP ()"
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.RI "virtual QwtDoubleRect \fBboundingRect\fP () const "
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.RI "virtual \fBQwtData\fP * \fBcopy\fP () const =0"
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.RI "virtual size_t \fBsize\fP () const =0"
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.RI "virtual double \fBx\fP (size_t i) const =0"
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.RI "virtual double \fBy\fP (size_t i) const =0"
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.SS "Protected Member Functions"

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.RI "\fBQwtData\fP & \fBoperator=\fP (const \fBQwtData\fP &)"
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.SH "Detailed Description"
.PP 
\fBQwtData\fP defines an interface to any type of curve data\&. 

Classes, derived from \fBQwtData\fP may:
.IP "\(bu" 2
store the data in almost any type of container
.IP "\(bu" 2
calculate the data on the fly instead of storing it 
.PP

.SH "Member Function Documentation"
.PP 
.SS "QwtDoubleRect QwtData::boundingRect () const\fC [virtual]\fP"
Returns the bounding rectangle of the data\&. If there is no bounding rect, like for empty data the rectangle is invalid: QwtDoubleRect::isValid() == false
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\fBWarning:\fP
.RS 4
This is an slow implementation iterating over all points\&. It is intended to be overloaded by derived classes\&. In case of auto scaling \fBboundingRect()\fP is called for every replot, so it might be worth to implement a cache, or use x(0), x(\fBsize()\fP - 1) for ordered data \&.\&.\&. 
.RE
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.PP
Reimplemented in \fBQwtCPointerData\fP, and \fBQwtArrayData\fP\&.
.SS "virtual \fBQwtData\fP* QwtData::copy () const\fC [pure virtual]\fP"
\fBReturns:\fP
.RS 4
Pointer to a copy (virtual copy constructor) 
.RE
.PP

.PP
Implemented in \fBQwtCPointerData\fP, \fBQwtArrayData\fP, and \fBQwtPolygonFData\fP\&.
.SS "\fBQwtData\fP& QwtData::operator= (const \fBQwtData\fP &)\fC [protected]\fP"
Assignment operator (virtualized) 
.SS "virtual size_t QwtData::size () const\fC [pure virtual]\fP"
\fBReturns:\fP
.RS 4
Size of the data set 
.RE
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.PP
Implemented in \fBQwtCPointerData\fP, \fBQwtArrayData\fP, and \fBQwtPolygonFData\fP\&.
.SS "virtual double QwtData::x (size_ti) const\fC [pure virtual]\fP"
Return the x value of data point i 
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\fBParameters:\fP
.RS 4
\fIi\fP Index 
.RE
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\fBReturns:\fP
.RS 4
x X value of data point i 
.RE
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.PP
Implemented in \fBQwtCPointerData\fP, \fBQwtArrayData\fP, and \fBQwtPolygonFData\fP\&.
.SS "virtual double QwtData::y (size_ti) const\fC [pure virtual]\fP"
Return the y value of data point i 
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\fBParameters:\fP
.RS 4
\fIi\fP Index 
.RE
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\fBReturns:\fP
.RS 4
y Y value of data point i 
.RE
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.PP
Implemented in \fBQwtCPointerData\fP, \fBQwtArrayData\fP, and \fBQwtPolygonFData\fP\&.

.SH "Author"
.PP 
Generated automatically by Doxygen for Qwt User's Guide from the source code\&.