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.TH "QwtPixelMatrix" 3 "Thu Dec 11 2014" "Version 6.1.2" "Qwt User's Guide" \" -*- nroff -*-
.ad l
.nh
.SH NAME
QwtPixelMatrix \-
.PP
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 "\fIConstructor\&. \fP"
.ti -1c
.RI "\fB~QwtPixelMatrix\fP ()"
.br
.RI "\fIDestructor\&. \fP"
.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 "\fITest if a pixel has been set\&. \fP"
.ti -1c
.RI "bool \fBtestAndSetPixel\fP (int x, int y, bool on)"
.br
.RI "\fISet a pixel and test if a pixel has been set before\&. \fP"
.ti -1c
.RI "int \fBindex\fP (int x, int y) const "
.br
.RI "\fICalculate the index in the bit field corresponding to a position\&. \fP"
.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 (intx, inty) 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 (intx, inty, boolon)\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 (intx, inty) 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\&.
|
