Sources_For_Linux/Qwt/doc/man/man3/QwtPixelMatrix.3

.TH "QwtPixelMatrix" 3 "Mon Dec 28 2020" "Version 6.1.6" "Qwt User's Guide" \" -*- nroff -*-
.ad l
.nh
.SH NAME
QwtPixelMatrix \- A bit field corresponding to the pixels of a rectangle\&.  

.SH SYNOPSIS
.br
.PP
.PP
\fC#include <qwt_pixel_matrix\&.h>\fP
.PP
Inherits QBitArray\&.
.SS "Public Member Functions"

.in +1c
.ti -1c
.RI "\fBQwtPixelMatrix\fP (const QRect &\fBrect\fP)"
.br
.RI "Constructor\&. "
.ti -1c
.RI "\fB~QwtPixelMatrix\fP ()"
.br
.RI "Destructor\&. "
.ti -1c
.RI "void \fBsetRect\fP (const QRect &\fBrect\fP)"
.br
.ti -1c
.RI "QRect \fBrect\fP () const"
.br
.ti -1c
.RI "bool \fBtestPixel\fP (int x, int y) const"
.br
.RI "Test if a pixel has been set\&. "
.ti -1c
.RI "bool \fBtestAndSetPixel\fP (int x, int y, bool on)"
.br
.RI "Set a pixel and test if a pixel has been set before\&. "
.ti -1c
.RI "int \fBindex\fP (int x, int y) const"
.br
.RI "Calculate the index in the bit field corresponding to a position\&. "
.in -1c
.SH "Detailed Description"
.PP 
A bit field corresponding to the pixels of a rectangle\&. 

\fBQwtPixelMatrix\fP is intended to filter out duplicates in an unsorted array of points\&. 
.SH "Constructor & Destructor Documentation"
.PP 
.SS "QwtPixelMatrix::QwtPixelMatrix (const QRect & rect)"

.PP
Constructor\&. 
.PP
\fBParameters\fP
.RS 4
\fIrect\fP Bounding rectangle for the matrix 
.RE
.PP

.SH "Member Function Documentation"
.PP 
.SS "int QwtPixelMatrix::index (int x, int y) const\fC [inline]\fP"

.PP
Calculate the index in the bit field corresponding to a position\&. 
.PP
\fBParameters\fP
.RS 4
\fIx\fP X-coordinate 
.br
\fIy\fP Y-coordinate 
.RE
.PP
\fBReturns\fP
.RS 4
Index, when \fBrect()\fP contains pos - otherwise -1\&. 
.RE
.PP

.SS "QRect QwtPixelMatrix::rect () const"

.PP
\fBReturns\fP
.RS 4
Bounding rectangle 
.RE
.PP

.SS "void QwtPixelMatrix::setRect (const QRect & rect)"
Set the bounding rectangle of the matrix
.PP
\fBParameters\fP
.RS 4
\fIrect\fP Bounding rectangle
.RE
.PP
\fBNote\fP
.RS 4
All bits are cleared 
.RE
.PP

.SS "bool QwtPixelMatrix::testAndSetPixel (int x, int y, bool on)\fC [inline]\fP"

.PP
Set a pixel and test if a pixel has been set before\&. 
.PP
\fBParameters\fP
.RS 4
\fIx\fP X-coordinate 
.br
\fIy\fP Y-coordinate 
.br
\fIon\fP Set/Clear the pixel
.RE
.PP
\fBReturns\fP
.RS 4
true, when pos is outside of \fBrect()\fP, or when the pixel was set before\&. 
.RE
.PP

.SS "bool QwtPixelMatrix::testPixel (int x, int y) const\fC [inline]\fP"

.PP
Test if a pixel has been set\&. 
.PP
\fBParameters\fP
.RS 4
\fIx\fP X-coordinate 
.br
\fIy\fP Y-coordinate
.RE
.PP
\fBReturns\fP
.RS 4
true, when pos is outside of \fBrect()\fP, or when the pixel has already been set\&. 
.RE
.PP


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