[Interest] QwtPlot in QGridLayout

[David Boosalis]

Issues with your code that I see:

1) It will not compile as is
2) you do not have and connect for addChartPB::clicked() and your slot
addChart().

I would advise you not use QWT to debug your code, but just use labels
instead.



On Thu, May 3, 2012 at 2:24 AM, Sujan Dasmahapatra <sdh at lmwindpower.com>wrote:

>  I want to create a some plots on the QGridLayout. ****
>
> I have a QWidget which has a pushbutton and another QWidget called canvas.
> ****
>
> In the canvas I have a QGridLayout.****
>
> When user presses the  pushbutton it should create a QWidget and this
> widget will have my plot and a legend. They will be appended in  2 columns
> and multiple rows.****
>
> ** **
>
> //please check this code snippet****
>
> ** **
>
> //sheet.h****
>
> class CSheet : public QWidget****
>
> {****
>
> Q_OBJECT****
>
> Public:****
>
> CSheet(QWidget *parent=0);****
>
> ~CSheet();****
>
> QWidget *canvas;****
>
> QPushButton *addChartPB;****
>
> QGridLayout  *layout;****
>
> ** **
>
> QList <QWidget *> plotWidgets;****
>
> QList  <QwtPlot *> plots;****
>
> QList <QWidget *> legends;****
>
> ** **
>
> int row, column;****
>
> ** **
>
> private slots:****
>
> void addChart();****
>
> ** **
>
> };****
>
> ** **
>
> //sheet.cpp****
>
> ** **
>
> CSheet::CSheet(QWidget *parent):QWidget(parent), row(0), column(0)****
>
> {****
>
>                 setGeometry(0,0,800,600);         ****
>
> ** **
>
>                 addChartPB = new QWidget(“Add chart”, this);****
>
>                 addChartPB->setGeometry(5,5,100,25);****
>
>                 addChartPB->show();****
>
> ** **
>
>                 canvas = new QWidget(this);****
>
>                 canvas->setGeometry(5,35,width()-10, height()-40);****
>
>                 canvas->show();****
>
>                                 ****
>
>                 layout = new QGridLayout(canvas);****
>
>                 canvas->setLayout(layout);****
>
> }****
>
> ** **
>
> CSheet::~CSheet()****
>
> {****
>
> } ****
>
> ** **
>
> void CSheet::addChart()****
>
> {****
>
>                 plotWidgets.append(new QWidget(canvas));****
>
> ** **
>
>                 plots.append(new QwtPlot(plotWidgets.last()));****
>
> ** **
>
>                 legends.append(new QWidget(plotWidgets.last()));****
>
> ** **
>
>                 layout->addWidget(plotWidgets.last(), row, column);****
>
> ** **
>
>                 if(column==0)****
>
>                                 column++;****
>
>                 else****
>
>                                 column--;            ****
>
>                 if(plotsWidgets.count()%2==0)****
>
>                 row++;****
>
> }****
>
> ** **
>
> ** **
>
> With this piece of code my plots and legends nothing is visible. Can
> anyone help in getting whats going wrong in this. Thanks a lot Sujan****
>
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