Qt/Images/MovingAPixmap

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main.cpp

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

form.h

 #ifndef CALCULATORFORM_H
 #define CALCULATORFORM_H
 
#include <QMainWindow>
 
 #include "ui_form.h"
 
 class MainWindow : public QMainWindow, private Ui::MainWindow
 {
     Q_OBJECT
 
 public:
     MainWindow(QMainWindow *parent = 0);
 
 private slots:
 
 };
 
 #endif

form.cpp

#include <QtGui>
 
#include "form.h"
 
#include <iostream>
#include <string>
 
#include <QFileDialog>
#include <QString>
 
class MyPixmapItem : public QGraphicsPixmapItem
{
public:
  MyPixmapItem( const QPixmap & pixmap) : QGraphicsPixmapItem(pixmap) {}
protected:
  void mouseMoveEvent ( QGraphicsSceneMouseEvent * event );
};
 
void MyPixmapItem::mouseMoveEvent ( QGraphicsSceneMouseEvent * event )
{
  QGraphicsPixmapItem::mouseMoveEvent(event);
  std::cout << event->scenePos().x() << std::endl;
}
 
MainWindow::MainWindow(QMainWindow* parent)
    : QMainWindow(parent)
{
  this->setupUi(this);
 
  QPixmap pixmap(20,20);
  QColor black(0,0,0);
  pixmap.fill(black);
 
  QGraphicsScene* scene = new QGraphicsScene;
  MyPixmapItem* item = new MyPixmapItem(pixmap);
  scene->addItem(item);
  item->setFlag(QGraphicsItem::ItemIsMovable);
 
  this->graphicsView->setScene(scene);
}

form.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <widget class="QGraphicsView" name="graphicsView">
    <property name="geometry">
     <rect>
      <x>210</x>
      <y>150</y>
      <width>351</width>
      <height>271</height>
     </rect>
    </property>
    <property name="dragMode">
     <enum>QGraphicsView::NoDrag</enum>
    </property>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>25</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>

CMakeLists.txt

cmake_minimum_required(VERSION 2.6)
 
project(TestQt)
 
FIND_PACKAGE(Qt4 REQUIRED)
INCLUDE(${QT_USE_FILE})
 
include_directories(${include_directories} ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR})
 
QT4_WRAP_UI(UISrcs form.ui)
QT4_WRAP_CPP(MOCSrcs form.h)
 
add_executable(TestQt main.cpp form.cpp ${MOCSrcs} ${UISrcs})
target_link_libraries(TestQt ${QT_LIBRARIES})