(C++) TestGravityWidget

ToolTestGravityWidget is a tool to test the GravityWidget class.

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Technical facts

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.9.2

Libraries used:

STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./ToolTestGravityWidget/ToolTestGravityWidgetDesktop.pro


include(../../DesktopApplication.pri)

include(../../Libraries/Boost.pri)

include(../../Libraries/GeneralConsole.pri)

include(../../Libraries/GeneralDesktop.pri)



include(ToolTestGravityWidgetDesktop.pri)



SOURCES += \

  qtmain.cpp

./ToolTestGravityWidget/ToolTestGravityWidgetConsole.pri


INCLUDEPATH += ../../Tools/ToolTestGravityWidget

./ToolTestGravityWidget/ToolTestGravityWidgetDesktop.pri


include(ToolTestGravityWidgetConsole.pri)



SOURCES += \

    ../../Tools/ToolTestGravityWidget/qttestgravitywidgetmaindialog.cpp \

    ../../Tools/ToolTestGravityWidget/qtgravitywidgetitem.cpp \

    ../../Tools/ToolTestGravityWidget/qtgravitywidget.cpp



HEADERS  += \

    ../../Tools/ToolTestGravityWidget/qttestgravitywidgetmaindialog.h \

    ../../Tools/ToolTestGravityWidget/qtgravitywidgetitem.h \

    ../../Tools/ToolTestGravityWidget/qtgravitywidget.h



FORMS    += ../../Tools/ToolTestGravityWidget/qttestgravitywidgetmaindialog.ui

./ToolTestGravityWidget/qtgravitywidget.h


#ifndef QTGRAVITYWIDGET_H

#define QTGRAVITYWIDGET_H



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#include <QGraphicsView>

#pragma GCC diagnostic pop



struct QGraphicsScene;



struct QtGravityWidget : public QGraphicsView

{

  QtGravityWidget(QWidget * parent = 0);





  protected:

  void resizeEvent(QResizeEvent *);



  private:

  QGraphicsScene * const m_scene;

};



#endif // QTGRAVITYWIDGET_H

./ToolTestGravityWidget/qtgravitywidget.cpp


#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#include <QGraphicsView>

#include <QTimer>

#include "qtgravitywidget.h"

#include "qtgravitywidgetitem.h"

#pragma GCC diagnostic pop



QtGravityWidget::QtGravityWidget(QWidget *parent)

  : QGraphicsView(parent),

    m_scene(new QGraphicsScene(this->rect(),this))

{

  this->setScene(m_scene);

  //Create the item

  {

    QtGravityWidgetItem * const item = new QtGravityWidgetItem(0,m_scene);

    item->setPos(static_cast<double>(width()) * 0.5,static_cast<double>(height()) * 0.5);

  }

  //Create the main QTimer

  {

    QTimer * const timer = new QTimer(this);

    timer->setInterval(20);

    QObject::connect(timer,SIGNAL(timeout()),m_scene,SLOT(advance()));

    timer->start();

  }



  //Turn off the scrollbars, as they look ugly

  this->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

  this->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

}





void QtGravityWidget::resizeEvent(QResizeEvent *)

{

  m_scene->setSceneRect(this->rect());

}

./ToolTestGravityWidget/qtgravitywidgetitem.h


#ifndef QTGRAVITYWIDGETITEM_H

#define QTGRAVITYWIDGETITEM_H



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#include <QGraphicsItem>

#pragma GCC diagnostic pop



struct QtGravityWidgetItem : public QGraphicsItem

{

  QtGravityWidgetItem(QGraphicsItem * parent, QGraphicsScene * scene);



  ///Must be defined, thanks compiler for telling me!

  QRectF boundingRect() const;



  ///Must be defined, thanks compiler for telling me!

  void paint(QPainter * painter, const QStyleOptionGraphicsItem *, QWidget *);



  ///Can be defined optionally, this will contain the falling motion

  void advance(int);



  private:

  ///The vertical speed

  double m_dy;



  ///The rectangle this QtGravityWidgetItem is in

  const QRectF m_rect;



  ///Read-only pointer to the QGraphicsScene this QtGravityWidgetItem is part of

  QGraphicsScene * const m_scene;



};

#endif // QTGRAVITYWIDGETITEM_H

./ToolTestGravityWidget/qtgravitywidgetitem.cpp


#include <cassert>

#include <cmath>



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#include <QGraphicsScene>

#include <QPainter>

#include "qtgravitywidgetitem.h"

#pragma GCC diagnostic pop



QtGravityWidgetItem::QtGravityWidgetItem(

  QGraphicsItem * parent,

  QGraphicsScene * scene)

  : QGraphicsItem(parent),

    m_dy(0.0),

    m_rect(-16.0,-16.0,32.0,32.0),

    m_scene(scene)

{

  assert(m_scene);

  m_scene->addItem(this);

}



void QtGravityWidgetItem::advance(int)

{

  const double acceleration = 0.1;



  //If the new y coordinat (after acceleration) causes the bottom of the QtGravityWidgetItem

  //to be beyond the edge of the QGraphicsScene, turn the vertical speed upwards

  if (y() + m_dy + acceleration + (m_rect.height() * 0.5) > m_scene->height()) m_dy = -std::abs(m_dy + acceleration);



  //Accelerate the QtGravityWidgetItem

  m_dy+=acceleration;



  //Move the QtGravityWidgetItem

  setY(y() + m_dy);



  //Move the QtGravityWidgetItem up when the QGraphicsScene is resized so much

  //that the QtGravityWidgetItem gets out of sight

  if (y() + (m_rect.height() * 0.5) > m_scene->height())

  {

    //Move the QtGravityWidgetItem to the bottom of the QGraphicsScene

    setY(m_scene->height() - (m_rect.height() * 0.5));



    //Set the vertical speed to zero, otherwise there is need to check if the QtGravityWidgetItem

    //leaves the top of the QGraphicsScene

    m_dy = 0.0;

  }

}



QRectF QtGravityWidgetItem::boundingRect() const

{

  return m_rect;

}



void QtGravityWidgetItem::paint(QPainter * painter, const QStyleOptionGraphicsItem *, QWidget *)

{

  painter->drawEllipse(m_rect);

}

./ToolTestGravityWidget/qtmain.cpp


#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#include <QApplication>

#include "qttestgravitywidgetmaindialog.h"

#pragma GCC diagnostic pop



int main(int argc, char *argv[])

{

  QApplication a(argc, argv);

  QtTestGravityWidgetMainDialog w;

  w.show();

  return a.exec();

}

./ToolTestGravityWidget/qttestgravitywidgetmaindialog.h


#ifndef TOOLTESTGRAVITYWIDGETMAINDIALOG_H

#define TOOLTESTGRAVITYWIDGETMAINDIALOG_H



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#include <QDialog>

#pragma GCC diagnostic pop



namespace Ui {

  class QtTestGravityWidgetMainDialog;

}



class QtTestGravityWidgetMainDialog : public QDialog

{

  Q_OBJECT

    

public:

  explicit QtTestGravityWidgetMainDialog(QWidget *parent = 0);

  QtTestGravityWidgetMainDialog(const QtTestGravityWidgetMainDialog&) = delete;

  QtTestGravityWidgetMainDialog& operator=(const QtTestGravityWidgetMainDialog&) = delete;

  ~QtTestGravityWidgetMainDialog() noexcept;



private:

  Ui::QtTestGravityWidgetMainDialog *ui;

};



#endif // TOOLTESTGRAVITYWIDGETMAINDIALOG_H

./ToolTestGravityWidget/qttestgravitywidgetmaindialog.cpp


#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#include <QGraphicsScene>

#include <QGraphicsView>

#include <QTimer>

#include "qtgravitywidget.h"

#include "qtgravitywidgetitem.h"

#include "qttestgravitywidgetmaindialog.h"

#include "ui_qttestgravitywidgetmaindialog.h"

#pragma GCC diagnostic pop



QtTestGravityWidgetMainDialog::QtTestGravityWidgetMainDialog(QWidget *parent) :

    QDialog(parent),

    ui(new Ui::QtTestGravityWidgetMainDialog)

{

  ui->setupUi(this);

}



QtTestGravityWidgetMainDialog::~QtTestGravityWidgetMainDialog() noexcept

{

  delete ui;

}

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