MyPlot( QWidget *parent=0, char *name=0 ) : QwtPlot( parent, name )
{
// Show a title
setTitle( "This is an Example" );
// Show a legend at the bottom
setAutoLegend( true );
setLegendPos( Qwt::Bottom );
// Show the axes
setAxisTitle( xBottom, "x" );
setAxisTitle( yLeft, "y" );
// Insert two curves and get IDs for them
long cSin = insertCurve( "y = sin(x)" );
long cSign = insertCurve( "y = sign(sin(x))" );
// Calculate the data, 500 points each
const int points = 500;
double x[ points ];
double sn[ points ];
double sg[ points ];
for( int i=0; i<points; i++ )
{
x[i] = (3.0*3.14/double(points))*double(i);
sn[i] = 2.0*sin( x[i] );
sg[i] = (sn[i]>0)?1:((sn[i]<0)?-1:0);
}
// Copy the data to the plot
setCurveData( cSin, x, sn, points );
setCurveData( cSign, x, sg, points );
// Set the style of the curves
setCurvePen( cSin, QPen( blue ) );
setCurvePen( cSign, QPen( green, 3 ) );
// Show the plots
replot();
}
Plot::Plot( QWidget *parent ):
QwtPlot( parent )
{
setObjectName( "FriedbergPlot" );
setTitle( "Temperature of Friedberg/Germany" );
setAxisTitle( QwtPlot::xBottom, "2007" );
setAxisScaleDiv( QwtPlot::xBottom, yearScaleDiv() );
setAxisScaleDraw( QwtPlot::xBottom, new YearScaleDraw() );
setAxisTitle( QwtPlot::yLeft,
QString( "Temperature [%1C]" ).arg( QChar( 0x00B0 ) ) );
// grid
QwtPlotGrid *grid = new Grid;
grid->attach( this );
insertLegend( new QwtLegend(), QwtPlot::RightLegend );
const int numDays = 365;
QVector<QPointF> averageData( numDays );
QVector<QwtIntervalSample> rangeData( numDays );
for ( int i = 0; i < numDays; i++ )
{
const Temperature &t = friedberg2007[i];
averageData[i] = QPointF( double( i ), t.averageValue );
rangeData[i] = QwtIntervalSample( double( i ),
QwtInterval( t.minValue, t.maxValue ) );
}
insertCurve( "Average", averageData, Qt::black );
insertErrorBars( "Range", rangeData, Qt::blue );
// LeftButton for the zooming
// MidButton for the panning
// RightButton: zoom out by 1
// Ctrl+RighButton: zoom out to full size
QwtPlotZoomer* zoomer = new QwtPlotZoomer( canvas() );
zoomer->setRubberBandPen( QColor( Qt::black ) );
zoomer->setTrackerPen( QColor( Qt::black ) );
zoomer->setMousePattern( QwtEventPattern::MouseSelect2,
Qt::RightButton, Qt::ControlModifier );
zoomer->setMousePattern( QwtEventPattern::MouseSelect3,
Qt::RightButton );
QwtPlotPanner *panner = new QwtPlotPanner( canvas() );
panner->setMouseButton( Qt::MidButton );
canvas()->setPalette( Qt::darkGray );
canvas()->setBorderRadius( 10 );
}
void Plot::insertCurve(int axis, double base)
{
Qt::Orientation o;
if ( axis == yLeft || axis == yRight )
o = Qt::Horizontal;
else
o = Qt::Vertical;
QRgb rgb = (uint)rand();
insertCurve(o, QColor(rgb), base);
replot();
}
Plot::Plot( QWidget *parent ):
QwtPlot( parent)
{
setPalette( Qt::black );
// we want to have the axis scales like a frame around the
// canvas
plotLayout()->setAlignCanvasToScales( true );
for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
axisWidget( axis )->setMargin( 0 );
QwtPlotCanvas *canvas = new QwtPlotCanvas();
canvas->setAutoFillBackground( false );
canvas->setFrameStyle( QFrame::NoFrame );
setCanvas( canvas );
setAxisScale( QwtPlot::yLeft, 0.0, 10.0 );
// a title
QwtText title( "Picker Demo" );
title.setColor( Qt::white );
title.setRenderFlags( Qt::AlignHCenter | Qt::AlignTop );
QFont font;
font.setBold( true );
title.setFont( font );
QwtPlotTextLabel *titleItem = new QwtPlotTextLabel();
titleItem->setText( title );
titleItem->attach( this );
#if 1
// section
//QColor c( "PaleVioletRed" );
QwtPlotZoneItem* zone = new QwtPlotZoneItem();
zone->setPen( Qt::darkGray );
zone->setBrush( QColor( "#834358" ) );
zone->setOrientation( Qt::Horizontal );
zone->setInterval( 3.8, 5.7 );
zone->attach( this );
#else
// grid
QwtPlotGrid *grid = new QwtPlotGrid();
grid->setMajorPen( Qt::white, 0, Qt::DotLine );
grid->setMinorPen( Qt::gray, 0 , Qt::DotLine );
grid->attach( this );
#endif
// curves
QPolygonF points1;
points1 << QPointF( 0.2, 4.4 ) << QPointF( 1.2, 3.0 )
<< QPointF( 2.7, 4.5 ) << QPointF( 3.5, 6.8 )
<< QPointF( 4.7, 7.9 ) << QPointF( 5.8, 7.1 );
insertCurve( "Curve 1", "DarkOrange", points1 );
QPolygonF points2;
points2 << QPointF( 0.4, 8.7 ) << QPointF( 1.4, 7.8 )
<< QPointF( 2.3, 5.5 ) << QPointF( 3.3, 4.1 )
<< QPointF( 4.4, 5.2 ) << QPointF( 5.6, 5.7 );
insertCurve( "Curve 2", "DodgerBlue", points2 );
CurveTracker* tracker = new CurveTracker( this->canvas() );
// for the demo we want the tracker to be active without
// having to click on the canvas
tracker->setStateMachine( new QwtPickerTrackerMachine() );
tracker->setRubberBandPen( QPen( "MediumOrchid" ) );
}
Plot::Plot(QWidget *parent):
QwtPlot(parent)
{
setTitle("Interactive Plot");
setCanvasColor(Qt::darkCyan);
QwtPlotGrid *grid = new QwtPlotGrid;
grid->setMajPen(QPen(Qt::white, 0, Qt::DotLine));
grid->attach(this);
// axes
setAxisScale(QwtPlot::xBottom, 0.0, 100.0);
setAxisScale(QwtPlot::yLeft, 0.0, 100.0);
// Avoid jumping when label with 3 digits
// appear/disappear when scrolling vertically
QwtScaleDraw *sd = axisScaleDraw(QwtPlot::yLeft);
sd->setMinimumExtent( sd->extent(axisWidget(QwtPlot::yLeft)->font()));
plotLayout()->setAlignCanvasToScales(true);
insertCurve(Qt::Vertical, Qt::blue, 30.0);
insertCurve(Qt::Vertical, Qt::magenta, 70.0);
insertCurve(Qt::Horizontal, Qt::yellow, 30.0);
insertCurve(Qt::Horizontal, Qt::white, 70.0);
replot();
// ------------------------------------
// We add a color bar to the left axis
// ------------------------------------
QwtScaleWidget *scaleWidget = (QwtScaleWidget *)axisWidget(yLeft);
scaleWidget->setMargin(10); // area for the color bar
d_colorBar = new ColorBar(Qt::Vertical, scaleWidget);
d_colorBar->setRange(Qt::red, Qt::darkBlue);
d_colorBar->setFocusPolicy(Qt::TabFocus);
connect(d_colorBar, SIGNAL(selected(const QColor &)),
SLOT(setCanvasColor(const QColor &)));
// we need the resize events, to lay out the color bar
scaleWidget->installEventFilter(this);
// ------------------------------------
// We add a wheel to the canvas
// ------------------------------------
d_wheel = new QwtWheel(canvas());
d_wheel->setOrientation(Qt::Vertical);
d_wheel->setRange(-100, 100);
d_wheel->setValue(0.0);
d_wheel->setMass(0.2);
d_wheel->setTotalAngle(4 * 360.0);
connect(d_wheel, SIGNAL(valueChanged(double)),
SLOT(scrollLeftAxis(double)));
// we need the resize events, to lay out the wheel
canvas()->installEventFilter(this);
d_colorBar->setWhatsThis(
"Selecting a color will change the background of the plot.");
scaleWidget->setWhatsThis(
"Selecting a value at the scale will insert a new curve.");
d_wheel->setWhatsThis(
"With the wheel you can move the visible area.");
axisWidget(xBottom)->setWhatsThis(
"Selecting a value at the scale will insert a new curve.");
}
