Qt/Images/RubberBandSignal

main.cpp

#include <QApplication>
 
#include "form.h"
 
int main(int argc, char *argv[])
{
  QApplication app(argc, argv);
  Form form;
 
  form.show();
  return app.exec();
}

form.h

#ifndef FORM_H
#define FORM_H
 
#include "ui_form.h"
 
class Form : public QWidget, private Ui::Form
{
    Q_OBJECT
public slots:
 
public:
    Form(QWidget *parent = 0);
 
};
 
#endif

form.cpp

#include <QtGui>
#include <QImage>
#include <QRubberBand>
#include <QGraphicsView>
 
#include "form.h"
 
#include <iostream>
 
class MyGraphicsView : public QGraphicsView
{
public:
 
  MyGraphicsView( QWidget * parent = 0 ) : QGraphicsView(parent){}
 
  void mouseReleaseEvent(QMouseEvent *event);
  void mouseMoveEvent(QMouseEvent *event);
  void mousePressEvent(QMouseEvent *event);
};
 
void MyGraphicsView::mousePressEvent(QMouseEvent *event)
{
  QGraphicsView::mousePressEvent(event);
  QPoint point = event->pos();
  std::cout << "mousePressEvent: " << point.x() << " " << point.y() << std::endl;
}
 
void MyGraphicsView::mouseMoveEvent(QMouseEvent *event)
{
  QGraphicsView::mouseMoveEvent(event);
  QPoint point = event->pos();
  std::cout << "mouseMoveEvent: " << point.x() << " " << point.y() << std::endl;
 
}
 
void MyGraphicsView::mouseReleaseEvent(QMouseEvent *event)
{
  QGraphicsView::mouseReleaseEvent(event);
  QPoint point = event->pos();
  std::cout << "mouseReleaseEvent: " << point.x() << " " << point.y() << std::endl;
}
 
Form::Form(QWidget *parent)
    : QWidget(parent)
{
  setupUi(this);
 
  MyGraphicsView* graphicsView = new MyGraphicsView(this );
  graphicsView->show();
 
  QGraphicsScene* scene = new QGraphicsScene();
  graphicsView->setScene(scene);
  graphicsView->setDragMode(QGraphicsView::RubberBandDrag);
  graphicsView->show();
 
  QPixmap pixmap(100,100);
  pixmap.fill(QColor(255,0,0));
 
  QGraphicsPixmapItem* item = scene->addPixmap(pixmap);
 
}

form.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Form</class>
 <widget class="QWidget" name="Form">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>812</width>
    <height>565</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Form</string>
  </property>
 </widget>
 <resources/>
 <connections/>
</ui>

CMakeLists.txt

cmake_minimum_required(VERSION 2.6)
 
PROJECT(RubberbandSignal)
 
FIND_PACKAGE(Qt4 REQUIRED)
INCLUDE(${QT_USE_FILE})
 
QT4_WRAP_UI(UISrcs form.ui)
QT4_WRAP_CPP(MOCSrcs form.h)
 
include_directories(${include_directories} ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR})
 
ADD_EXECUTABLE(RubberbandSignal main.cpp form.h form.cpp ${MOCSrcs} ${UISrcs})
TARGET_LINK_LIBRARIES(RubberbandSignal ${QT_LIBRARIES})