739 lines
18 KiB
Groff
739 lines
18 KiB
Groff
.TH "QwtPlotSpectrogram" 3 "Sun Jul 18 2021" "Version 6.2.0" "Qwt User's Guide" \" -*- nroff -*-
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.ad l
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.nh
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.SH NAME
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QwtPlotSpectrogram \- A plot item, which displays a spectrogram\&.
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.SH SYNOPSIS
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.br
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.PP
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.PP
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\fC#include <qwt_plot_spectrogram\&.h>\fP
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.PP
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Inherits \fBQwtPlotRasterItem\fP\&.
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.SS "Public Types"
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.in +1c
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.ti -1c
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.RI "enum \fBDisplayMode\fP { \fBImageMode\fP = 0x01, \fBContourMode\fP = 0x02 }"
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.br
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.ti -1c
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.RI "typedef QFlags< \fBDisplayMode\fP > \fBDisplayModes\fP"
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.br
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.in -1c
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.SS "Public Member Functions"
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.in +1c
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.ti -1c
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.RI "\fBQwtPlotSpectrogram\fP (const QString &\fBtitle\fP=QString())"
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.br
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.ti -1c
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.RI "virtual \fB~QwtPlotSpectrogram\fP ()"
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.br
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.RI "Destructor\&. "
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.ti -1c
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.RI "void \fBsetDisplayMode\fP (\fBDisplayMode\fP, bool on=true)"
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.br
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.ti -1c
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.RI "bool \fBtestDisplayMode\fP (\fBDisplayMode\fP) const"
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.br
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.ti -1c
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.RI "void \fBsetData\fP (\fBQwtRasterData\fP *\fBdata\fP)"
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.br
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.ti -1c
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.RI "const \fBQwtRasterData\fP * \fBdata\fP () const"
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.br
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.ti -1c
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.RI "\fBQwtRasterData\fP * \fBdata\fP ()"
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.br
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.ti -1c
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.RI "void \fBsetColorMap\fP (\fBQwtColorMap\fP *)"
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.br
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.ti -1c
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.RI "const \fBQwtColorMap\fP * \fBcolorMap\fP () const"
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.br
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.ti -1c
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.RI "void \fBsetColorTableSize\fP (int numColors)"
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.br
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.ti -1c
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.RI "int \fBcolorTableSize\fP () const"
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.br
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.ti -1c
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.RI "virtual \fBQwtInterval\fP \fBinterval\fP (Qt::Axis) const override"
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.br
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.ti -1c
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.RI "virtual QRectF \fBpixelHint\fP (const QRectF &) const override"
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.br
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.RI "Pixel hint\&. "
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.ti -1c
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.RI "void \fBsetDefaultContourPen\fP (const QColor &, qreal width=0\&.0, Qt::PenStyle=Qt::SolidLine)"
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.br
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.ti -1c
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.RI "void \fBsetDefaultContourPen\fP (const QPen &)"
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.br
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.RI "Set the default pen for the contour lines\&. "
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.ti -1c
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.RI "QPen \fBdefaultContourPen\fP () const"
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.br
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.ti -1c
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.RI "virtual QPen \fBcontourPen\fP (double level) const"
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.br
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.RI "Calculate the pen for a contour line\&. "
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.ti -1c
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.RI "void \fBsetConrecFlag\fP (\fBQwtRasterData::ConrecFlag\fP, bool on)"
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.br
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.ti -1c
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.RI "bool \fBtestConrecFlag\fP (\fBQwtRasterData::ConrecFlag\fP) const"
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.br
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.ti -1c
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.RI "void \fBsetContourLevels\fP (const \fBQList\fP< double > &)"
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.br
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.ti -1c
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.RI "\fBQList\fP< double > \fBcontourLevels\fP () const"
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.br
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.ti -1c
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.RI "virtual int \fBrtti\fP () const override"
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.br
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.ti -1c
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.RI "virtual void \fBdraw\fP (QPainter *, const \fBQwtScaleMap\fP &xMap, const \fBQwtScaleMap\fP &yMap, const QRectF &canvasRect) const override"
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.br
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.RI "Draw the spectrogram\&. "
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.in -1c
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.SS "Protected Member Functions"
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.in +1c
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.ti -1c
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.RI "virtual QImage \fBrenderImage\fP (const \fBQwtScaleMap\fP &xMap, const \fBQwtScaleMap\fP &yMap, const QRectF &area, const QSize &imageSize) const override"
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.br
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.RI "Render an image from data and color map\&. "
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.ti -1c
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.RI "virtual QSize \fBcontourRasterSize\fP (const QRectF &, const QRect &) const"
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.br
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.RI "Return the raster to be used by the CONREC contour algorithm\&. "
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.ti -1c
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.RI "virtual \fBQwtRasterData::ContourLines\fP \fBrenderContourLines\fP (const QRectF &rect, const QSize &raster) const"
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.br
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.ti -1c
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.RI "virtual void \fBdrawContourLines\fP (QPainter *, const \fBQwtScaleMap\fP &xMap, const \fBQwtScaleMap\fP &yMap, const \fBQwtRasterData::ContourLines\fP &) const"
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.br
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.ti -1c
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.RI "void \fBrenderTile\fP (const \fBQwtScaleMap\fP &xMap, const \fBQwtScaleMap\fP &yMap, const QRect &tile, QImage *) const"
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.br
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.RI "Render a tile of an image\&. "
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.in -1c
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.SH "Detailed Description"
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.PP
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A plot item, which displays a spectrogram\&.
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A spectrogram displays 3-dimensional data, where the 3rd dimension ( the intensity ) is displayed using colors\&. The colors are calculated from the values using a color map\&.
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.PP
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On multi-core systems the performance of the image composition can often be improved by dividing the area into tiles - each of them rendered in a different thread ( see \fBQwtPlotItem::setRenderThreadCount()\fP )\&.
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.PP
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In ContourMode contour lines are painted for the contour levels\&.
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.PP
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\fBSee also\fP
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.RS 4
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\fBQwtRasterData\fP, \fBQwtColorMap\fP, \fBQwtPlotItem::setRenderThreadCount()\fP
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.RE
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.PP
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.PP
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Definition at line 36 of file qwt_plot_spectrogram\&.h\&.
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.SH "Member Typedef Documentation"
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.PP
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.SS "typedef QFlags<\fBDisplayMode\fP > \fBQwtPlotSpectrogram::DisplayModes\fP"
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An ORed combination of \fBDisplayMode\fP values\&.
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.PP
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Definition at line 53 of file qwt_plot_spectrogram\&.h\&.
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.SH "Member Enumeration Documentation"
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.PP
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.SS "enum \fBQwtPlotSpectrogram::DisplayMode\fP"
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The display mode controls how the raster data will be represented\&.
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetDisplayMode()\fP, \fBtestDisplayMode()\fP
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.RE
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.PP
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.PP
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\fBEnumerator\fP
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.in +1c
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.TP
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\fB\fIImageMode \fP\fP
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The values are mapped to colors using a color map\&.
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.TP
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\fB\fIContourMode \fP\fP
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The data is displayed using contour lines\&.
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.PP
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Definition at line 44 of file qwt_plot_spectrogram\&.h\&.
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.SH "Constructor & Destructor Documentation"
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.PP
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.SS "QwtPlotSpectrogram::QwtPlotSpectrogram (const QString & title = \fCQString()\fP)\fC [explicit]\fP"
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Sets the following item attributes:
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.IP "\(bu" 2
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\fBQwtPlotItem::AutoScale\fP: true
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.IP "\(bu" 2
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\fBQwtPlotItem::Legend\fP: false
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.PP
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.PP
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The z value is initialized by 8\&.0\&.
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.PP
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\fBParameters\fP
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.RS 4
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\fItitle\fP Title
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBQwtPlotItem::setItemAttribute()\fP, \fBQwtPlotItem::setZ()\fP
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.RE
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.PP
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.PP
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Definition at line 108 of file qwt_plot_spectrogram\&.cpp\&.
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.SH "Member Function Documentation"
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.PP
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.SS "const \fBQwtColorMap\fP * QwtPlotSpectrogram::colorMap () const"
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.PP
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\fBReturns\fP
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.RS 4
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Color Map used for mapping the intensity values to colors
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetColorMap()\fP
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.RE
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.PP
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.PP
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Definition at line 200 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "int QwtPlotSpectrogram::colorTableSize () const"
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.PP
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\fBReturns\fP
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.RS 4
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Size of the color table, 0 means not using a color table
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBQwtColorMap::colorTable()\fP, \fBsetColorTableSize()\fP
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.RE
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.PP
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.PP
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Definition at line 238 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "\fBQList\fP< double > QwtPlotSpectrogram::contourLevels () const"
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.PP
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\fBReturns\fP
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.RS 4
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Levels of the contour lines\&.
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.RE
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.PP
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The levels are sorted in increasing order\&.
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.PP
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\fBSee also\fP
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.RS 4
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\fBcontourLevels()\fP, \fBrenderContourLines()\fP, \fBQwtRasterData::contourLines()\fP
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.RE
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.PP
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.PP
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Definition at line 382 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "QPen QwtPlotSpectrogram::contourPen (double level) const\fC [virtual]\fP"
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.PP
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Calculate the pen for a contour line\&. The color of the pen is the color for level calculated by the color map
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.PP
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\fBParameters\fP
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.RS 4
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\fIlevel\fP Contour level
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.RE
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.PP
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\fBReturns\fP
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.RS 4
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Pen for the contour line
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.RE
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.PP
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\fBNote\fP
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.RS 4
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contourPen is only used if \fBdefaultContourPen()\fP\&.style() == Qt::NoPen
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetDefaultContourPen()\fP, \fBsetColorMap()\fP, \fBsetContourLevels()\fP
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.RE
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.PP
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.PP
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Definition at line 303 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "QSize QwtPlotSpectrogram::contourRasterSize (const QRectF & area, const QRect & rect) const\fC [protected]\fP, \fC [virtual]\fP"
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.PP
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Return the raster to be used by the CONREC contour algorithm\&. A larger size will improve the precision of the CONREC algorithm, but will slow down the time that is needed to calculate the lines\&.
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.PP
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The default implementation returns rect\&.size() / 2 bounded to the resolution depending on pixelSize()\&.
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.PP
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\fBParameters\fP
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.RS 4
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\fIarea\fP Rectangle, where to calculate the contour lines
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.br
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\fIrect\fP Rectangle in pixel coordinates, where to paint the contour lines
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.RE
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.PP
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\fBReturns\fP
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.RS 4
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Raster to be used by the CONREC contour algorithm\&.
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.RE
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.PP
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\fBNote\fP
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.RS 4
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The size will be bounded to rect\&.size()\&.
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBdrawContourLines()\fP, \fBQwtRasterData::contourLines()\fP
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.RE
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.PP
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.PP
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Definition at line 663 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "\fBQwtRasterData\fP * QwtPlotSpectrogram::data ()"
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.PP
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\fBReturns\fP
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.RS 4
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Spectrogram data
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetData()\fP
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.RE
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.PP
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.PP
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Definition at line 418 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "const \fBQwtRasterData\fP * QwtPlotSpectrogram::data () const"
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.PP
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\fBReturns\fP
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.RS 4
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Spectrogram data
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetData()\fP
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.RE
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.PP
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.PP
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Definition at line 409 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "QPen QwtPlotSpectrogram::defaultContourPen () const"
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.PP
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\fBReturns\fP
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.RS 4
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Default contour pen
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetDefaultContourPen()\fP
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.RE
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.PP
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.PP
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Definition at line 287 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "void QwtPlotSpectrogram::draw (QPainter * painter, const \fBQwtScaleMap\fP & xMap, const \fBQwtScaleMap\fP & yMap, const QRectF & canvasRect) const\fC [override]\fP, \fC [virtual]\fP"
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.PP
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Draw the spectrogram\&.
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Painter
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.br
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\fIxMap\fP Maps x-values into pixel coordinates\&.
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.br
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\fIyMap\fP Maps y-values into pixel coordinates\&.
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.br
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\fIcanvasRect\fP Contents rectangle of the canvas in painter coordinates
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetDisplayMode()\fP, \fBrenderImage()\fP, \fBQwtPlotRasterItem::draw()\fP, \fBdrawContourLines()\fP
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.RE
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.PP
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.PP
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Reimplemented from \fBQwtPlotRasterItem\fP\&.
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.PP
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Definition at line 754 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "void QwtPlotSpectrogram::drawContourLines (QPainter * painter, const \fBQwtScaleMap\fP & xMap, const \fBQwtScaleMap\fP & yMap, const \fBQwtRasterData::ContourLines\fP & contourLines) const\fC [protected]\fP, \fC [virtual]\fP"
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Paint the contour lines
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Painter
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.br
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\fIxMap\fP Maps x-values into pixel coordinates\&.
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.br
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\fIyMap\fP Maps y-values into pixel coordinates\&.
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.br
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\fIcontourLines\fP Contour lines
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBrenderContourLines()\fP, \fBdefaultContourPen()\fP, \fBcontourPen()\fP
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.RE
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.PP
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.PP
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Definition at line 709 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "\fBQwtInterval\fP QwtPlotSpectrogram::interval (Qt::Axis axis) const\fC [override]\fP, \fC [virtual]\fP"
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.PP
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\fBReturns\fP
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.RS 4
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Bounding interval for an axis
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.RE
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.PP
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The default implementation returns the interval of the associated raster data object\&.
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.PP
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\fBParameters\fP
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.RS 4
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\fIaxis\fP X, Y, or Z axis
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBQwtRasterData::interval()\fP
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.RE
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.PP
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.PP
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Reimplemented from \fBQwtPlotRasterItem\fP\&.
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.PP
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Definition at line 432 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "QRectF QwtPlotSpectrogram::pixelHint (const QRectF & area) const\fC [override]\fP, \fC [virtual]\fP"
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.PP
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Pixel hint\&. The geometry of a pixel is used to calculated the resolution and alignment of the rendered image\&.
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.PP
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The default implementation returns \fBdata()\fP->pixelHint( rect );
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.PP
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\fBParameters\fP
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.RS 4
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\fIarea\fP In most implementations the resolution of the data doesn't depend on the requested area\&.
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.RE
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.PP
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\fBReturns\fP
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.RS 4
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Bounding rectangle of a pixel
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBQwtPlotRasterItem::pixelHint()\fP, \fBQwtRasterData::pixelHint()\fP, render(), \fBrenderImage()\fP
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.RE
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.PP
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.PP
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Reimplemented from \fBQwtPlotRasterItem\fP\&.
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.PP
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Definition at line 456 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "\fBQwtRasterData::ContourLines\fP QwtPlotSpectrogram::renderContourLines (const QRectF & rect, const QSize & raster) const\fC [protected]\fP, \fC [virtual]\fP"
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Calculate contour lines
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.PP
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\fBParameters\fP
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.RS 4
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\fIrect\fP Rectangle, where to calculate the contour lines
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.br
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\fIraster\fP Raster, used by the CONREC algorithm
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.RE
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.PP
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\fBReturns\fP
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.RS 4
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Calculated contour lines
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBcontourLevels()\fP, \fBsetConrecFlag()\fP, \fBQwtRasterData::contourLines()\fP
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.RE
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.PP
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Definition at line 689 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "QImage QwtPlotSpectrogram::renderImage (const \fBQwtScaleMap\fP & xMap, const \fBQwtScaleMap\fP & yMap, const QRectF & area, const QSize & imageSize) const\fC [override]\fP, \fC [protected]\fP, \fC [virtual]\fP"
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Render an image from data and color map\&. For each pixel of area the value is mapped into a color\&.
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\fBParameters\fP
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.RS 4
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\fIxMap\fP X-Scale Map
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.br
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\fIyMap\fP Y-Scale Map
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.br
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\fIarea\fP Requested area for the image in scale coordinates
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.br
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\fIimageSize\fP Size of the requested image
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\fBReturns\fP
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.RS 4
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A QImage::Format_Indexed8 or QImage::Format_ARGB32 depending on the color map\&.
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.RE
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\fBSee also\fP
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\fBQwtRasterData::value()\fP, \fBQwtColorMap::rgb()\fP, \fBQwtColorMap::colorIndex()\fP
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Implements \fBQwtPlotRasterItem\fP\&.
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Definition at line 480 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "void QwtPlotSpectrogram::renderTile (const \fBQwtScaleMap\fP & xMap, const \fBQwtScaleMap\fP & yMap, const QRect & tile, QImage * image) const\fC [protected]\fP"
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Render a tile of an image\&. Rendering in tiles can be used to composite an image in parallel threads\&.
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\fBParameters\fP
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.RS 4
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\fIxMap\fP X-Scale Map
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.br
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\fIyMap\fP Y-Scale Map
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.br
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\fItile\fP Geometry of the tile in image coordinates
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.br
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\fIimage\fP Image to be rendered
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Definition at line 572 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "int QwtPlotSpectrogram::rtti () const\fC [override]\fP, \fC [virtual]\fP"
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\fBReturns\fP
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.RS 4
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\fBQwtPlotItem::Rtti_PlotSpectrogram\fP
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Reimplemented from \fBQwtPlotItem\fP\&.
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Definition at line 126 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "void QwtPlotSpectrogram::setColorMap (\fBQwtColorMap\fP * colorMap)"
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Change the color map
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.PP
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Often it is useful to display the mapping between intensities and colors as an additional plot axis, showing a color bar\&.
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\fBParameters\fP
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\fIcolorMap\fP Color Map
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\fBSee also\fP
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\fBcolorMap()\fP, \fBQwtScaleWidget::setColorBarEnabled()\fP, \fBQwtScaleWidget::setColorMap()\fP
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Definition at line 177 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "void QwtPlotSpectrogram::setColorTableSize (int numColors)"
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Limit the number of colors being used by the color map
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When using a color table the mapping from the value into a color is usually faster as it can be done by simple lookups into a precalculated color table\&.
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Setting a table size > 0 enables using a color table, while setting the size to 0 disables it\&.
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The default size = 0, and no color table is used\&.
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\fBParameters\fP
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\fInumColors\fP Number of colors\&. 0 means not using a color table
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.RE
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\fBNote\fP
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.RS 4
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The colorTableSize has no effect when using a color table of \fBQwtColorMap::Indexed\fP, where the size is always 256\&.
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\fBSee also\fP
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\fBQwtColorMap::colorTable()\fP, \fBcolorTableSize()\fP
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Definition at line 224 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "void QwtPlotSpectrogram::setConrecFlag (\fBQwtRasterData::ConrecFlag\fP flag, bool on)"
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Modify an attribute of the CONREC algorithm, used to calculate the contour lines\&.
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\fBParameters\fP
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.RS 4
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\fIflag\fP CONREC flag
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.br
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\fIon\fP On/Off
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.RE
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\fBSee also\fP
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\fBtestConrecFlag()\fP, \fBrenderContourLines()\fP, \fBQwtRasterData::contourLines()\fP
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Definition at line 324 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "void QwtPlotSpectrogram::setContourLevels (const \fBQList\fP< double > & levels)"
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Set the levels of the contour lines
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\fBParameters\fP
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\fIlevels\fP Values of the contour levels
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\fBSee also\fP
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\fBcontourLevels()\fP, \fBrenderContourLines()\fP, \fBQwtRasterData::contourLines()\fP
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.RE
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\fBNote\fP
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.RS 4
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contourLevels returns the same levels but sorted\&.
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Definition at line 365 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "void QwtPlotSpectrogram::setData (\fBQwtRasterData\fP * data)"
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Set the data to be displayed
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\fBParameters\fP
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.RS 4
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\fIdata\fP Spectrogram Data
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\fBSee also\fP
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\fBdata()\fP
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Definition at line 393 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "void QwtPlotSpectrogram::setDefaultContourPen (const QColor & color, qreal width = \fC0\&.0\fP, Qt::PenStyle style = \fCQt::SolidLine\fP)"
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Build and assign the default pen for the contour lines
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.PP
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In Qt5 the default pen width is 1\&.0 ( 0\&.0 in Qt4 ) what makes it non cosmetic ( see QPen::isCosmetic() )\&. This method has been introduced to hide this incompatibility\&.
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\fBParameters\fP
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.RS 4
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\fIcolor\fP Pen color
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.br
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\fIwidth\fP Pen width
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.br
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\fIstyle\fP Pen style
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\fBSee also\fP
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pen(), brush()
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Definition at line 256 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "void QwtPlotSpectrogram::setDefaultContourPen (const QPen & pen)"
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.PP
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Set the default pen for the contour lines\&. If the spectrogram has a valid default contour pen a contour line is painted using the default contour pen\&. Otherwise (pen\&.style() == Qt::NoPen) the pen is calculated for each contour level using \fBcontourPen()\fP\&.
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\fBSee also\fP
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\fBdefaultContourPen()\fP, \fBcontourPen()\fP
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Definition at line 272 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "void QwtPlotSpectrogram::setDisplayMode (\fBDisplayMode\fP mode, bool on = \fCtrue\fP)"
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The display mode controls how the raster data will be represented\&.
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\fBParameters\fP
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.RS 4
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\fImode\fP Display mode
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.br
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\fIon\fP On/Off
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.RE
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The default setting enables ImageMode\&.
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\fBSee also\fP
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.RS 4
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\fBDisplayMode\fP, displayMode()
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Definition at line 141 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "bool QwtPlotSpectrogram::testConrecFlag (\fBQwtRasterData::ConrecFlag\fP flag) const"
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Test an attribute of the CONREC algorithm, used to calculate the contour lines\&.
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\fBParameters\fP
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.RS 4
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\fIflag\fP CONREC flag
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\fBReturns\fP
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.RS 4
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true, is enabled
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.RE
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The default setting enables \fBQwtRasterData::IgnoreAllVerticesOnLevel\fP
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.PP
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\fBSee also\fP
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.RS 4
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setConrecClag(), \fBrenderContourLines()\fP, \fBQwtRasterData::contourLines()\fP
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Definition at line 350 of file qwt_plot_spectrogram\&.cpp\&.
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.SS "bool QwtPlotSpectrogram::testDisplayMode (\fBDisplayMode\fP mode) const"
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The display mode controls how the raster data will be represented\&.
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.PP
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\fBParameters\fP
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.RS 4
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\fImode\fP Display mode
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\fBReturns\fP
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true if mode is enabled
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Definition at line 161 of file qwt_plot_spectrogram\&.cpp\&.
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.SH "Author"
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.PP
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Generated automatically by Doxygen for Qwt User's Guide from the source code\&.
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