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#ifndef PAINT_H
#define PAINT_H
#include <QDialog>

class QPushButton;

class PaintBoard : public QDialog
{
  Q_OBJECT
public:
  PaintBoard(QWidget *parent = 0);
  void paintEvent(QPaintEvent *event);
signals:
private slots:
     void cpaint();

private:
QPushButton *rbutton;
};
#endif

#include <QtGui>
#include "paint.h"

PaintBoard::PaintBoard(QWidget *parent) : QDialog(parent)
{
   rbutton = new QPushButton(tr("gav"));
   QHBoxLayout *bottom = new  QHBoxLayout; 
   bottom->addWidget(rbutton);
   setLayout(bottom);

  connect(rbutton, SIGNAL(clicked()), this, SLOT(cpaint()));  
}

  void PaintBoard::paintEvent(QPaintEvent *event)
{ 
   QPainter painter(this);
   painter.drawEllipse(10, 10, 20, 20);
}

void PaintBoard::cpaint()
{
  QPainter painter(this);
  painter.setPen(QPen(Qt::black, 9, Qt::SolidLine, Qt::RoundCap));
// painter.drawEllipse(10, 10, 90, 90);
  update();
}

#include <QApplication>
#include <QPainter>
#include "paint.h"

int main(int argc, char **argv) {
QApplication app(argc, argv);
   PaintBoard *form = new PaintBoard;
   form->show();
   return app.exec();
}

#ifndef RENDERAREA_H
#define RENDERAREA_H

#include <QPainterPath>
#include <QWidget>

class RenderArea : public QWidget
{ Q_OBJECT
  public:
    RenderArea(const QPainterPath &path, QWidget *parent = 0);

 public slots:
    void chlinewidth();
 protected:
    void paintEvent(QPaintEvent *event);
 private:
    QPainterPath path;
    int penwidth;
};

#endif  

#ifndef WINDOW_H
 #define WINDOW_H

 #include <QWidget>

class QPushButton;
class RenderArea;

class Window : public QWidget
 {
     Q_OBJECT

 public:
     Window();
 private slots:
 private:
     RenderArea *renderAreas;
     QPushButton *movebutton;
 };
 #endif 

#include <QtGui>
 #include <math.h>

 #include "renderarea.h"
 #include "window.h"

 const float Pi = 3.14159f;

 Window::Window()
 {  
     QPainterPath rectPath;
      rectPath.moveTo(80.0, 50.0);
      rectPath.arcTo(20.0, 30.0, 60.0, 40.0, 0.0, 360.0);
      rectPath.closeSubpath();

  
     renderAreas = new RenderArea(rectPath);
     movebutton = new QPushButton(tr("Mov"));

     connect(movebutton, SIGNAL(clicked()), renderAreas, SLOT(chlinewidth())); 
 
     QGridLayout *topLayout = new QGridLayout;
         topLayout->addWidget(renderAreas);

     QGridLayout *mainLayout = new QGridLayout;
        mainLayout->addLayout(topLayout, 0, 0, 1, 4);
        mainLayout->addWidget(movebutton);
        setLayout(mainLayout);
   
        setWindowTitle(tr("Painter Paths"));
 }

#include <QApplication>

 #include "window.h"

 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
     Window window;
     window.show();
     return app.exec();
 }