curvdemo1.cpp
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#include <qwt_scale_map.h>
#include <qwt_plot_curve.h>
#include <qwt_symbol.h>
#include <qwt_math.h>
#include <qcolor.h>
#include <qpainter.h>
#include <qapplication.h>
#include <qframe.h>
//------------------------------------------------------------
// curvdemo1
//
// This example program features some of the different
// display styles of the QwtPlotCurve class
//------------------------------------------------------------
//
// Array Sizes
//
const int Size = 27;
const int CurvCnt = 6;
//
// Arrays holding the values
//
double xval[Size];
double yval[Size];
QwtScaleMap xMap;
QwtScaleMap yMap;
class MainWin : public QFrame
{
public:
MainWin();
protected:
virtual void paintEvent( QPaintEvent * );
void drawContents( QPainter *p );
private:
void shiftDown( QRect &rect, int offset ) const;
QwtPlotCurve d_curves[CurvCnt];
};
MainWin::MainWin()
{
int i;
xMap.setScaleInterval( -0.5, 10.5 );
yMap.setScaleInterval( -1.1, 1.1 );
//
// Frame style
//
setFrameStyle( QFrame::Box | QFrame::Raised );
setLineWidth( 2 );
setMidLineWidth( 3 );
//
// Calculate values
//
for( i = 0; i < Size; i++ )
{
xval[i] = double( i ) * 10.0 / double( Size - 1 );
yval[i] = qSin( xval[i] ) * qCos( 2.0 * xval[i] );
}
//
// define curve styles
//
i = 0;
d_curves[i].setSymbol( new QwtSymbol( QwtSymbol::Cross, Qt::NoBrush,
QPen( Qt::black ), QSize( 5, 5 ) ) );
d_curves[i].setPen( Qt::darkGreen );
d_curves[i].setStyle( QwtPlotCurve::Lines );
d_curves[i].setCurveAttribute( QwtPlotCurve::Fitted );
i++;
d_curves[i].setSymbol( new QwtSymbol( QwtSymbol::Ellipse, Qt::yellow,
QPen( Qt::blue ), QSize( 5, 5 ) ) );
d_curves[i].setPen( Qt::red );
d_curves[i].setStyle( QwtPlotCurve::Sticks );
i++;
d_curves[i].setPen( Qt::darkBlue );
d_curves[i].setStyle( QwtPlotCurve::Lines );
i++;
d_curves[i].setPen( Qt::darkBlue );
d_curves[i].setStyle( QwtPlotCurve::Lines );
d_curves[i].setRenderHint( QwtPlotItem::RenderAntialiased );
i++;
d_curves[i].setPen( Qt::darkCyan );
d_curves[i].setStyle( QwtPlotCurve::Steps );
i++;
d_curves[i].setSymbol( new QwtSymbol( QwtSymbol::XCross, Qt::NoBrush,
QPen( Qt::darkMagenta ), QSize( 5, 5 ) ) );
d_curves[i].setStyle( QwtPlotCurve::NoCurve );
i++;
//
// attach data
//
for( i = 0; i < CurvCnt; i++ )
d_curves[i].setRawSamples( xval, yval, Size );
}
void MainWin::shiftDown( QRect &rect, int offset ) const
{
rect.translate( 0, offset );
}
void MainWin::paintEvent( QPaintEvent *event )
{
QFrame::paintEvent( event );
QPainter painter( this );
painter.setClipRect( contentsRect() );
drawContents( &painter );
}
//
// REDRAW CONTENTS
//
void MainWin::drawContents( QPainter *painter )
{
int deltay, i;
QRect r = contentsRect();
deltay = r.height() / CurvCnt - 1;
r.setHeight( deltay );
//
// draw curves
//
for ( i = 0; i < CurvCnt; i++ )
{
xMap.setPaintInterval( r.left(), r.right() );
yMap.setPaintInterval( r.top(), r.bottom() );
painter->setRenderHint( QPainter::Antialiasing,
d_curves[i].testRenderHint( QwtPlotItem::RenderAntialiased ) );
d_curves[i].draw( painter, xMap, yMap, r );
shiftDown( r, deltay );
}
//
// draw titles
//
r = contentsRect(); // reset r
painter->setFont( QFont( "Helvetica", 8 ) );
const int alignment = Qt::AlignTop | Qt::AlignHCenter;
painter->setPen( Qt::black );
painter->drawText( 0, r.top(), r.width(), painter->fontMetrics().height(),
alignment, "Style: Line/Fitted, Symbol: Cross" );
shiftDown( r, deltay );
painter->drawText( 0, r.top(), r.width(), painter->fontMetrics().height(),
alignment, "Style: Sticks, Symbol: Ellipse" );
shiftDown( r, deltay );
painter->drawText( 0 , r.top(), r.width(), painter->fontMetrics().height(),
alignment, "Style: Lines, Symbol: None" );
shiftDown( r, deltay );
painter->drawText( 0 , r.top(), r.width(), painter->fontMetrics().height(),
alignment, "Style: Lines, Symbol: None, Antialiased" );
shiftDown( r, deltay );
painter->drawText( 0, r.top(), r.width(), painter->fontMetrics().height(),
alignment, "Style: Steps, Symbol: None" );
shiftDown( r, deltay );
painter->drawText( 0, r.top(), r.width(), painter->fontMetrics().height(),
alignment, "Style: NoCurve, Symbol: XCross" );
}
int main ( int argc, char **argv )
{
QApplication a( argc, argv );
MainWin w;
w.resize( 300, 600 );
w.show();
return a.exec();
}