size of QWTplot without axes.

[Gora]

Hello,

can someone tell me, how can i get a size of QWTPlot without axes?

Thanks.

[raphael.lencrerot]

Ask for canvas size which is a widget:
http://qwt.sourceforge.net/class_qwt_plot.html#aafcc82150034fbeb393ceb9f54ba2 f1a

[Gora]

Thanks for your answer. I tested it successfully, but one thing I don't understand. If you look at the following example

#include <cmath>
#include <iostream>
#include <QApplication>
#include <qwt_plot.h>
#include <qwt_plot_curve.h>
#include <qwt_series_data.h>
#include <qwt_point_data.h>

int main(int argc, char **argv)
{
QApplication a(argc, argv);

QwtPlot * plot=new QwtPlot(QwtText("CppQwtExample1"));
plot->setGeometry(0,0,640,400);
plot->setAxisScale(QwtPlot::xBottom, 0.0,2.0 * M_PI);
plot->setAxisScale(QwtPlot::yLeft,-1.0,1.0);

QwtPlotCurve curve("Sine");
std::vector<double> xs;
std::vector<double> ys;
for (double x = 0; x < 2.0 * M_PI; x+=(M_PI / 10.0))
{
xs.push_back(x);
ys.push_back(std::sin(x));
}
QwtPointArrayData * const data = new QwtPointArrayData(&xs[0],&ys[0],xs.size());
curve.setData(data);
curve.attach(plot);
QList<QRect> * dummy=new QList<QRect>;
dummy->append(plot->canvas()->geometry());
dummy->append(plot->geometry());
plot->show();

return a.exec();
}

then I get for the geometry from the parent widget a size of 640X480 and the size of canvas is 100X30, although the both widgets have the same size. Can someone it explain?

Thanks

[Uwe]

Layout calculations are triggered by events, that are processed inside QApplication::exec(). The geometries you are collecting in your list are pointless - too early.

Uwe