void ScalePicker::refresh()
{
for ( uint i = 0; i < QwtPlot::axisCnt; i++ ){
QwtScaleWidget *scale = (QwtScaleWidget *)plot()->axisWidget(i);
if ( scale )
scale->installEventFilter(this);
}
}
ScalePicker::ScalePicker( QwtPlot *plot ):
QObject( plot )
{
for ( uint i = 0; i < QwtPlot::axisCnt; i++ )
{
QwtScaleWidget *scaleWidget = plot->axisWidget( i );
if ( scaleWidget )
scaleWidget->installEventFilter( this );
}
}
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.");
}
