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[bharathballa]

Thanks for your response,

i am very new to qt,
i just need one basic example. actually my requirement is to develop one speedometer kind of application.

i took a dialog widget at the time of creating a project.

following are my files.
main.cpp
dialog.cpp
dialog.h
dialog.ui

in dialog.ui, i added Push button and and line edit by drag dropping.
In the same ui i need one circle with a marker, if i enter any value in lineedit and press the pushbutton, the marker position has to change according to the value.

i implemented a small example as follows

dialog.h
**********
// dialog.h

#ifndef DIALOG_H
#define DIALOG_H
 
#include <QDialog>
#include <QPainter>
 
namespace Ui {
class Dialog;
}
 
class Dialog : public QDialog
{
    Q_OBJECT
 
public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();
 
private:
    Ui::Dialog *ui;
 
protected:
    void paintEvent(QPaintEvent *e);
};
 
#endif // DIALOG_H

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QPainter>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT
    
public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();
    
private:
    Ui::Dialog *ui;

protected:
    void paintEvent(QPaintEvent *e);
};

#endif // DIALOG_H

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dialog.cpp
********

#include "dialog.h"
#include "ui_dialog.h"
 
Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
}
 
Dialog::~Dialog()
{
    delete ui;
}
 
void Dialog:: paintEvent(QPaintEvent *e)
{
{
    QPainter painter(this);
 
    QPen pen1(Qt::black);
    pen1.setWidth(5);
 
    QPen pen2(Qt::red);
    pen2.setWidth(5);
 
    QPen pen3(Qt::green);
    pen3.setWidth(5);
 
    QPen pen4(Qt::blue);
    pen4.setWidth(5);
 
    int x0 = 100;
    int y0 = 100;
    int width = 200;
    int height = 200;
    QRect rect(x0, y0, width, height);
 
    // original rectangle
    painter.setPen(pen1);
    painter.drawRect(rect);
 
 
    // rotation
    // rotate around (0,0) which is top-left
    // rect center (xc,yc)
    int xc = x0 + width/2;
    int yc = y0 + height/2;
 
    // order of transformation
    //  (1) translate to top-left
    //  (2) rotate
    //  (3) move back to (xc,yc)
    //
    painter.translate(xc, yc);    //(3)
    painter.rotate(45);           //(2)
    painter.translate(-xc, -yc);  //(1)
 
    painter.setPen(pen2);
    painter.drawRect(rect);
 
    // scale -> 1/2
    painter.translate(xc, yc);
    painter.scale(0.5,0.5);
    painter.translate(-xc, -yc);
 
    painter.setPen(pen3);
    painter.drawRect(rect);
 
    // Back to the initial state
    // shear
    painter.resetTransform();
    painter.translate(xc, yc);
    painter.shear(0.5,0.5);
    painter.translate(-xc, -yc);
 
    painter.setPen(pen4);
    painter.drawRect(rect);
}.

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
}

Dialog::~Dialog()
{
    delete ui;
}

void Dialog:: paintEvent(QPaintEvent *e)
{
{
    QPainter painter(this);

    QPen pen1(Qt::black);
    pen1.setWidth(5);

    QPen pen2(Qt::red);
    pen2.setWidth(5);

    QPen pen3(Qt::green);
    pen3.setWidth(5);

    QPen pen4(Qt::blue);
    pen4.setWidth(5);

    int x0 = 100;
    int y0 = 100;
    int width = 200;
    int height = 200;
    QRect rect(x0, y0, width, height);

    // original rectangle
    painter.setPen(pen1);
    painter.drawRect(rect);


    // rotation
    // rotate around (0,0) which is top-left
    // rect center (xc,yc)
    int xc = x0 + width/2;
    int yc = y0 + height/2;

    // order of transformation
    //  (1) translate to top-left
    //  (2) rotate
    //  (3) move back to (xc,yc)
    //
    painter.translate(xc, yc);    //(3)
    painter.rotate(45);           //(2)
    painter.translate(-xc, -yc);  //(1)

    painter.setPen(pen2);
    painter.drawRect(rect);

    // scale -> 1/2
    painter.translate(xc, yc);
    painter.scale(0.5,0.5);
    painter.translate(-xc, -yc);

    painter.setPen(pen3);
    painter.drawRect(rect);

    // Back to the initial state
    // shear
    painter.resetTransform();
    painter.translate(xc, yc);
    painter.shear(0.5,0.5);
    painter.translate(-xc, -yc);

    painter.setPen(pen4);
    painter.drawRect(rect);
}.

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in the dialog.ui i havent done anything, but when i running the application empty dialog is opening

i tried the below code
http://www.bogotobogo.com/Qt/Qt5_QPa...sformation.php