void Plot::setTransformation( QwtTransform *transform )
{
QwtLinearScaleEngine *scaleEngine = new QwtLinearScaleEngine();
scaleEngine->setTransformation( transform );
setAxisScaleEngine( QwtPlot::xBottom, scaleEngine );
// we have to reassign the axis settinge, because they are
// invalidated, when the scale engine has changed
QwtScaleDiv scaleDiv =
axisScaleEngine( QwtPlot::xBottom )->divideScale( 10.0, 1000.0, 8, 10 );
QList<double> ticks;
ticks += 10.0;
ticks += scaleDiv.ticks( QwtScaleDiv::MajorTick );
scaleDiv.setTicks( QwtScaleDiv::MajorTick, ticks );
setAxisScaleDiv( QwtPlot::xBottom, scaleDiv );
replot();
}
/*!
\brief Paint the plot into a given rectangle.
Paint the contents of a QwtPlot instance into a given rectangle.
\param painter Painter
\param plotRect Bounding rectangle
\param pfilter Print filter
\sa QwtPlotPrintFilter
*/
void QwtPlot::print(QPainter *painter, const QRect &plotRect,
const QwtPlotPrintFilter &pfilter) const
{
int axisId;
if ( painter == 0 || !painter->isActive() ||
!plotRect.isValid() || size().isNull() )
return;
painter->save();
#if 1
/*
PDF: In Qt4 ( <= 4.3.2 ) the scales are painted in gray instead of
black. See http://trolltech.com/developer/task-tracker/index_html?id=184671&method=entry
The dummy lines below work around the problem.
*/
const QPen pen = painter->pen();
painter->setPen(QPen(Qt::black, 1));
painter->setPen(pen);
#endif
// All paint operations need to be scaled according to
// the paint device metrics.
QwtPainter::setMetricsMap(this, painter->device());
const QwtMetricsMap &metricsMap = QwtPainter::metricsMap();
// It is almost impossible to integrate into the Qt layout
// framework, when using different fonts for printing
// and screen. To avoid writing different and Qt unconform
// layout engines we change the widget attributes, print and
// reset the widget attributes again. This way we produce a lot of
// useless layout events ...
pfilter.apply((QwtPlot *)this);
int baseLineDists[QwtPlot::axisCnt];
if ( pfilter.options() & QwtPlotPrintFilter::PrintFrameWithScales ) {
for (axisId = 0; axisId < QwtPlot::axisCnt; axisId++ ) {
QwtScaleWidget *scaleWidget = (QwtScaleWidget *)axisWidget(axisId);
if ( scaleWidget ) {
baseLineDists[axisId] = scaleWidget->margin();
scaleWidget->setMargin(0);
}
}
}
// Calculate the layout for the print.
int layoutOptions = QwtPlotLayout::IgnoreScrollbars
| QwtPlotLayout::IgnoreFrames;
if ( !(pfilter.options() & QwtPlotPrintFilter::PrintMargin) )
layoutOptions |= QwtPlotLayout::IgnoreMargin;
if ( !(pfilter.options() & QwtPlotPrintFilter::PrintLegend) )
layoutOptions |= QwtPlotLayout::IgnoreLegend;
((QwtPlot *)this)->plotLayout()->activate(this,
QwtPainter::metricsMap().deviceToLayout(plotRect),
layoutOptions);
if ((pfilter.options() & QwtPlotPrintFilter::PrintTitle)
&& (!titleLabel()->text().isEmpty())) {
printTitle(painter, plotLayout()->titleRect());
}
if ( (pfilter.options() & QwtPlotPrintFilter::PrintLegend)
&& legend() && !legend()->isEmpty() ) {
printLegend(painter, plotLayout()->legendRect());
}
for ( axisId = 0; axisId < QwtPlot::axisCnt; axisId++ ) {
QwtScaleWidget *scaleWidget = (QwtScaleWidget *)axisWidget(axisId);
if (scaleWidget) {
int baseDist = scaleWidget->margin();
int startDist, endDist;
scaleWidget->getBorderDistHint(startDist, endDist);
printScale(painter, axisId, startDist, endDist,
baseDist, plotLayout()->scaleRect(axisId));
}
}
QRect canvasRect = plotLayout()->canvasRect();
/*
The border of the bounding rect needs to ba scaled to
layout coordinates, so that it is aligned to the axes
*/
QRect boundingRect( canvasRect.left() - 1, canvasRect.top() - 1,
canvasRect.width() + 2, canvasRect.height() + 2);
boundingRect = metricsMap.layoutToDevice(boundingRect);
boundingRect.setWidth(boundingRect.width() - 1);
boundingRect.setHeight(boundingRect.height() - 1);
canvasRect = metricsMap.layoutToDevice(canvasRect);
// When using QwtPainter all sizes where computed in pixel
// coordinates and scaled by QwtPainter later. This limits
// the precision to screen resolution. A better solution
// is to scale the maps and print in unlimited resolution.
QwtScaleMap map[axisCnt];
for (axisId = 0; axisId < axisCnt; axisId++) {
map[axisId].setTransformation(axisScaleEngine(axisId)->transformation());
const QwtScaleDiv &scaleDiv = *axisScaleDiv(axisId);
map[axisId].setScaleInterval(scaleDiv.lBound(), scaleDiv.hBound());
double from, to;
if ( axisEnabled(axisId) ) {
const int sDist = axisWidget(axisId)->startBorderDist();
const int eDist = axisWidget(axisId)->endBorderDist();
const QRect &scaleRect = plotLayout()->scaleRect(axisId);
if ( axisId == xTop || axisId == xBottom ) {
from = metricsMap.layoutToDeviceX(scaleRect.left() + sDist);
to = metricsMap.layoutToDeviceX(scaleRect.right() + 1 - eDist);
} else {
from = metricsMap.layoutToDeviceY(scaleRect.bottom() + 1 - eDist );
to = metricsMap.layoutToDeviceY(scaleRect.top() + sDist);
}
} else {
int margin = plotLayout()->canvasMargin(axisId);
if ( axisId == yLeft || axisId == yRight ) {
margin = metricsMap.layoutToDeviceY(margin);
from = canvasRect.bottom() - margin;
to = canvasRect.top() + margin;
} else {
margin = metricsMap.layoutToDeviceX(margin);
from = canvasRect.left() + margin;
to = canvasRect.right() - margin;
}
}
map[axisId].setPaintXInterval(from, to);
}
// The canvas maps are already scaled.
QwtPainter::setMetricsMap(painter->device(), painter->device());
printCanvas(painter, boundingRect, canvasRect, map, pfilter);
QwtPainter::resetMetricsMap();
((QwtPlot *)this)->plotLayout()->invalidate();
// reset all widgets with their original attributes.
if ( pfilter.options() & QwtPlotPrintFilter::PrintFrameWithScales ) {
// restore the previous base line dists
for (axisId = 0; axisId < QwtPlot::axisCnt; axisId++ ) {
QwtScaleWidget *scaleWidget = (QwtScaleWidget *)axisWidget(axisId);
if ( scaleWidget )
scaleWidget->setMargin(baseLineDists[axisId]);
}
}
pfilter.reset((QwtPlot *)this);
painter->restore();
}
/**
* Set the scale of the horizontal axis
* @param from :: Minimum value
* @param to :: Maximum value
*/
void OneCurvePlot::setXScale(double from, double to)
{
QFontMetrics fm(axisFont(QwtPlot::xBottom));
int n = from != 0.0 ? abs(static_cast<int>(floor(log10(fabs(from))))) : 0;
int n1 = to != 0.0 ? abs(static_cast<int>(floor(log10(fabs(to))))) : 0;
if (n1 > n) n = n1;
n += 4;
// approxiamte width of a tick label in pixels
int labelWidth = n * fm.width("0");
// calculate number of major ticks
int nMajorTicks = this->width() / labelWidth;
if ( nMajorTicks > 6 ) nMajorTicks = 6;
// try creating a scale
const QwtScaleDiv div = axisScaleEngine(QwtPlot::xBottom)->divideScale(from,to,nMajorTicks,nMajorTicks);
// Major ticks are placed at round numbers so the first or last tick could be missing making
// scale look ugly. Trying to fix it if possible
bool rescaled = false;
// get actual tick positions
const QwtValueList& ticks = div.ticks(QwtScaleDiv::MajorTick);
if (!ticks.empty() && ticks.size() < nMajorTicks)
{
// how much first tick is shifted from the lower bound
double firstShift = ticks.front() - div.lBound();
// how much last tick is shifted from the upper bound
double lastShift = div.hBound() - ticks.back();
// range of the scale
double range = fabs(div.hBound() - div.lBound());
// we say that 1st tick is missing if first tick is father away from its end of the scale
// than the last tick is from its end
bool isFirstMissing = fabs(firstShift) > fabs(lastShift) ;
// if first tick is missing
if (isFirstMissing)
{
// distance between nearest major ticks
double tickSize = 0;
if (ticks.size() == 1)
{
// guess the tick size in case of only one visible
double tickLog = log10(firstShift);
tickLog = tickLog > 0 ? ceil(tickLog) : floor(tickLog);
tickSize = pow(10.,tickLog);
}
else if (ticks.size() > 1)
{
// take the difference between the two first ticks
tickSize = ticks[1] - ticks[0];
}
// claculate how much lower bound must be moved to make the missing tick visible
double shift = (ticks.front() - tickSize) - from;
// if the shift is not very big rescale the axis
if (fabs(shift/range) < 0.1)
{
from += shift;
const QwtScaleDiv updatedDiv = axisScaleEngine(QwtPlot::xBottom)->divideScale(from,to,nMajorTicks,nMajorTicks);
setAxisScaleDiv(xBottom,updatedDiv);
rescaled = true;
}
}
else // last tick is missing
{
// distance between nearest major ticks
double tickSize = 0;
if (ticks.size() == 1)
{
// guess the tick size in case of only one visible
double tickLog = log10(lastShift);
tickLog = tickLog > 0 ? ceil(tickLog) : floor(tickLog);
tickSize = pow(10.,tickLog);
}
else if (ticks.size() > 1)
{
// take the difference between the two first ticks
tickSize = ticks[1] - ticks[0];
}
// claculate how much upper bound must be moved to make the missing tick visible
double shift = (ticks.back() + tickSize) - to;
// if the shift is not very big rescale the axis
if (fabs(shift/range) < 0.1)
{
to += shift;
const QwtScaleDiv updatedDiv = axisScaleEngine(QwtPlot::xBottom)->divideScale(from,to,nMajorTicks,nMajorTicks);
setAxisScaleDiv(xBottom,updatedDiv);
rescaled = true;
}
}
}
if (!rescaled)
{
setAxisScaleDiv(xBottom,div);
}
m_zoomer->setZoomBase();
}
/*!
\brief Paint the plot into a given rectangle.
Paint the contents of a QwtPlot instance into a given rectangle.
\param painter Painter
\param plotRect Bounding rectangle
\param pfilter Print filter
\sa QwtPlotPrintFilter
*/
void QwtPlot::print(QPainter *painter, const QRect &plotRect,
const QwtPlotPrintFilter &pfilter) const
{
int axisId;
if ( painter == 0 || !painter->isActive() ||
!plotRect.isValid() || size().isNull() )
return;
painter->save();
// All paint operations need to be scaled according to
// the paint device metrics.
QwtPainter::setMetricsMap(this, painter->device());
const QwtMetricsMap &metricsMap = QwtPainter::metricsMap();
// It is almost impossible to integrate into the Qt layout
// framework, when using different fonts for printing
// and screen. To avoid writing different and Qt unconform
// layout engines we change the widget attributes, print and
// reset the widget attributes again. This way we produce a lot of
// useless layout events ...
pfilter.apply((QwtPlot *)this);
int baseLineDists[QwtPlot::axisCnt];
if ( !(pfilter.options() & QwtPlotPrintFilter::PrintCanvasBackground) )
{
// In case of no background we set the backbone of
// the scale on the frame of the canvas.
for (axisId = 0; axisId < QwtPlot::axisCnt; axisId++ )
{
QwtScaleWidget *scaleWidget = (QwtScaleWidget *)axisWidget(axisId);
if ( scaleWidget )
{
baseLineDists[axisId] = scaleWidget->baseLineDist();
scaleWidget->setBaselineDist(0);
}
}
}
// Calculate the layout for the print.
int layoutOptions = QwtPlotLayout::IgnoreScrollbars
| QwtPlotLayout::IgnoreFrames;
if ( !(pfilter.options() & QwtPlotPrintFilter::PrintMargin) )
layoutOptions |= QwtPlotLayout::IgnoreMargin;
if ( !(pfilter.options() & QwtPlotPrintFilter::PrintLegend) )
layoutOptions |= QwtPlotLayout::IgnoreLegend;
((QwtPlot *)this)->plotLayout()->activate(this,
QwtPainter::metricsMap().deviceToLayout(plotRect),
layoutOptions);
if ((pfilter.options() & QwtPlotPrintFilter::PrintTitle)
&& (!titleLabel()->text().isEmpty()))
{
printTitle(painter, plotLayout()->titleRect());
}
if ( (pfilter.options() & QwtPlotPrintFilter::PrintLegend)
&& legend() && !legend()->isEmpty() )
{
printLegend(painter, plotLayout()->legendRect());
}
for ( axisId = 0; axisId < QwtPlot::axisCnt; axisId++ )
{
QwtScaleWidget *scaleWidget = (QwtScaleWidget *)axisWidget(axisId);
if (scaleWidget)
{
int baseDist = scaleWidget->baseLineDist();
int startDist, endDist;
scaleWidget->getBorderDistHint(startDist, endDist);
printScale(painter, axisId, startDist, endDist,
baseDist, plotLayout()->scaleRect(axisId));
}
}
const QRect canvasRect = metricsMap.layoutToDevice(plotLayout()->canvasRect());
// When using QwtPainter all sizes where computed in pixel
// coordinates and scaled by QwtPainter later. This limits
// the precision to screen resolution. A much better solution
// is to scale the maps and print in unlimited resolution.
QwtArray<QwtScaleMap> map(axisCnt);
for (axisId = 0; axisId < axisCnt; axisId++)
{
map[axisId].setTransformation(axisScaleEngine(axisId)->transformation());
const QwtScaleDiv &scaleDiv = *axisScaleDiv(axisId);
map[axisId].setScaleInterval(scaleDiv.lBound(), scaleDiv.hBound());
double from, to;
if ( axisEnabled(axisId) )
{
const int sDist = axisWidget(axisId)->startBorderDist();
const int eDist = axisWidget(axisId)->endBorderDist();
const QRect &scaleRect = plotLayout()->scaleRect(axisId);
if ( axisId == xTop || axisId == xBottom )
{
from = metricsMap.layoutToDeviceX(scaleRect.left() + sDist);
to = metricsMap.layoutToDeviceX(scaleRect.right() - eDist);
}
else
{
from = metricsMap.layoutToDeviceY(scaleRect.bottom() - sDist);
to = metricsMap.layoutToDeviceY(scaleRect.top() + eDist);
}
}
else
{
const int margin = plotLayout()->canvasMargin(axisId);
const QRect &canvasRect = plotLayout()->canvasRect();
if ( axisId == yLeft || axisId == yRight )
{
from = metricsMap.layoutToDeviceX(canvasRect.bottom() - margin);
to = metricsMap.layoutToDeviceX(canvasRect.top() + margin);
}
else
{
from = metricsMap.layoutToDeviceY(canvasRect.left() + margin);
to = metricsMap.layoutToDeviceY(canvasRect.right() - margin);
}
}
map[axisId].setPaintXInterval(from, to);
}
// The canvas maps are already scaled.
QwtPainter::setMetricsMap(painter->device(), painter->device());
printCanvas(painter, canvasRect, map, pfilter);
QwtPainter::resetMetricsMap();
((QwtPlot *)this)->plotLayout()->invalidate();
// reset all widgets with their original attributes.
if ( !(pfilter.options() & QwtPlotPrintFilter::PrintCanvasBackground) )
{
// restore the previous base line dists
for (axisId = 0; axisId < QwtPlot::axisCnt; axisId++ )
{
QwtScaleWidget *scaleWidget = (QwtScaleWidget *)axisWidget(axisId);
if ( scaleWidget )
scaleWidget->setBaselineDist(baseLineDists[axisId]);
}
}
pfilter.reset((QwtPlot *)this);
painter->restore();
}
Psdplot::Psdplot(QWidget *parent)
:QwtPlot(parent)
,xMin_(0)
,xMax_(0)
,haveLine1_(false)
,haveLine2_(false)
,havevLine1_(false)
{
counter_ = 0;
numPoints_ = 1;
indexPoints_ = new double[numPoints_];
dataPoints_ = new double[numPoints_];
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
QPalette palette;
palette.setColor(canvas()->backgroundRole(), QColor("white"));
canvas()->setPalette(palette);
curve_ = new QwtPlotCurve("Curve");
curve_->setPen(QPen(Qt::blue, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
curve_->setStyle(QwtPlotCurve::Lines);
curve_->setRawSamples(indexPoints_, dataPoints_, numPoints_);
curve_->setYAxis(QwtPlot::yLeft);
curve_->attach(this);
memset(dataPoints_, 0x0, numPoints_*sizeof(double));
for(int i=0;i<numPoints_;i++)
indexPoints_[i] = i;
line1_ = new QwtPlotCurve("Line1");
line1_->setPen(QPen(Qt::red, 5, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
line1_->setStyle(QwtPlotCurve::Lines);
line1_->attach(this);
line2_ = new QwtPlotCurve("Line2");
line2_->setPen(QPen(Qt::blue, 5, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
line2_->setStyle(QwtPlotCurve::Lines);
line2_->attach(this);
vline1_ = new QwtPlotCurve("vLine1");
vline1_->setPen(QPen(Qt::black, 3, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
vline1_->setStyle(QwtPlotCurve::Lines);
vline1_->attach(this);
enableAxis(QwtPlot::yRight);
QwtScaleWidget *leftAxis = axisWidget(QwtPlot::yLeft);
connect(leftAxis, SIGNAL(scaleDivChanged()), this, SLOT(linkScales()));
setAxisScaleEngine(QwtPlot::xBottom, new QwtLinearScaleEngine);
setAxisScaleEngine(QwtPlot::yLeft, new QwtLinearScaleEngine);
setAxisScaleEngine(QwtPlot::yRight, new QwtLinearScaleEngine);
axisScaleEngine(QwtPlot::xBottom)->setAttribute(QwtScaleEngine::Floating,true);
axisScaleEngine(QwtPlot::yLeft)->setAttribute(QwtScaleEngine::Floating,true);
axisScaleEngine(QwtPlot::yRight)->setAttribute(QwtScaleEngine::Floating,true);
zoomer_ = new MyZoomer(canvas());
zoomer_->setMousePattern(QwtEventPattern::MouseSelect1, Qt::LeftButton);
zoomer_->setMousePattern(QwtEventPattern::MouseSelect2, Qt::LeftButton,
Qt::ControlModifier);
panner_ = new QwtPlotPanner(canvas());
panner_->setMouseButton(Qt::RightButton);
magnifier_ = new QwtPlotMagnifier(canvas());
magnifier_->setMouseButton(Qt::NoButton);
}
