Russian Qt Forum

class SimpleItem : public QObject, public QGraphicsItem
{
	Q_OBJECT
public:
	qreal x, y, rad, a, sinrad, cosrad, direction;
	QColor *mycolor;

	//Конструктор: присваивает объекту случайный цвет и траекторию
	SimpleItem(qreal ax, qreal ay, qreal arad, qreal az): x(ax), y(ay), rad(arad), a(az) 
	{
		mycolor = new QColor( rand()%255, rand()%255, rand()%255);
		sinrad = rand()%10;
		cosrad = rand()%10;
		direction = ((rand()%2)*2 - 1)/((qreal)(rand()%40) + 10);
	}
	QRectF boundingRect() const
	{
		qreal penWidth = 1;
		return QRectF(x-rad, y-rad, x+rad, y+rad);
	}

	void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
	{
		QPen aMicPen(*mycolor, 2);
		painter->translate(-rad/2, -rad/2);
		painter->setPen(aMicPen);

		painter->drawEllipse(x, y, rad, rad);
		painter->drawLine(x+rad/2, y+rad/2, x + rad*(0.5+qCos(a)), y + rad*(0.5+qSin(a)));
	}
	public slots:
		//"Кружит" объект по эллиптической траектории вокруг некоторого центра 
		void vertigo()
		{
			y += sinrad*sin(a);
			x += cosrad*cos(a);
			a += direction;
			update();
		}
};

class QtSandbox : public QMainWindow
{
	Q_OBJECT

public:
	QtSandbox(QWidget *parent = 0, Qt::WFlags flags = 0): QMainWindow(parent)
	{
		//Заполнение сцены объектами
		QTimer *aqtimer = new QTimer;
		aqtimer->start(10);

		QGraphicsScene *scene = new QGraphicsScene(this);
		SimpleItem *si[100];
		for(int i = 0; i < 100; ++i)
		{
			si[i] = new SimpleItem(150 + rand()%300, 150 + rand()%300, 10 + rand()%11, 1.57);
			scene->addItem(si[i]);
			connect(aqtimer, SIGNAL(timeout()), si[i], SLOT(vertigo()));
		}
		QGraphicsView *view = new QGraphicsView(scene, this);
		view->setSceneRect(0, 0, 600, 600);
		view->setFixedSize(610, 610);
		view->show();

		//Дальше кнопки и компоновка содержимого в окне
		//-------
		QWidget *CW1 = new QWidget;
		QWidget *CW2 = new QWidget;
		setCentralWidget(CW1);
		QPushButton *pb1 = new QPushButton("Exit", this);
		QPushButton *pb2 = new QPushButton("Renew", this);
		QPushButton *pb3 = new QPushButton("DoSomething", this);
		connect(pb1, SIGNAL(clicked()), this, SLOT(close()));
		//...
		QGridLayout *mainLayout = new QGridLayout;
		QHBoxLayout *hLay = new QHBoxLayout;
		QVBoxLayout *vLay = new QVBoxLayout;

		vLay->addWidget(pb1);
		vLay->addWidget(pb2);
		vLay->addWidget(pb3);
		CW2->setLayout(vLay);
		hLay->addWidget(view);
		hLay->addWidget(CW2);
		CW1->setLayout(hLay);
		//-------
	}
	~QtSandbox(){}

private:
	Ui::QtSandboxClass ui;
};

class SimpleItem : public QObject, public QGraphicsItem
{
	Q_OBJECT
public:
	qreal x, y, rad, a, sinrad, cosrad, direction;
	QColor *mycolor;

	//Конструктор: присваивает объекту случайный цвет и траекторию
	SimpleItem(qreal ax, qreal ay, qreal arad, qreal az, QGraphicsItem * parent = 0): 
			x(ax), y(ay), rad(arad), a(az), QGraphicsItem(parent)
	{
		mycolor = new QColor( rand()%255, rand()%255, rand()%255);
		sinrad = rand()%10;
		cosrad = rand()%10;
		direction = ((rand()%2)*2 - 1)/((qreal)(rand()%40) + 10);
	}
	QRectF boundingRect() const
	{
		//return QRectF(x-rad-3, y-rad-3, x+3*rad+3, y+3*rad+3);
		return QRectF(-rad-3, -rad-3, 3*rad+3, 3*rad+3);
	}

	void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
	{
		QPen aMicPen(*mycolor, 2);
		//painter->translate(-rad/2, -rad/2);
		painter->setPen(aMicPen);

		painter->drawEllipse(x, y, rad, rad);
		painter->drawLine(x+rad/2, y+rad/2, x + rad*(0.5+qCos(a)), y + rad*(0.5+qSin(a)));
	}
	public slots:
		//"Кружит" объект по эллиптической траектории вокруг некоторого центра 
		void vertigo()
		{
                        //x += cosrad*cos(a);
                        //y += sinrad*sin(a);
			setPos(x+cosrad*cos(a), y+sinrad*sin(a));
			a += direction;
			update();
		}
};

class SimpleItem : public QObject, public QGraphicsItem
{
	Q_OBJECT
public:
	qreal rad, a, sinrad, cosrad, direction;
	QColor *mycolor;

	SimpleItem(qreal ax, qreal ay, qreal arad, qreal az, QGraphicsItem * parent = 0): rad(arad), a(az), QGraphicsItem(parent)
	{
		setPos(ax, ay);
		mycolor = new QColor( rand()%255, rand()%255, rand()%255);
		sinrad = rand()%10;
		cosrad = rand()%10;
		direction = ((rand()%2)*2 - 1)/((qreal)(rand()%40) + 10);
	}
	QRectF boundingRect() const
	{
		return QRectF(-rad-3, -rad-3, 3*rad+3, 3*rad+3);
	}

	void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
	{
		painter->setPen(*mycolor);
		painter->drawEllipse(0, 0, rad, rad);
		painter->drawLine(rad/2, rad/2, rad*(0.5+qCos(a)), rad*(0.5+qSin(a)));
	}
	public slots:
		void vertigo()
		{
			moveBy(cosrad*cos(a), sinrad*sin(a));
			a += direction;
		}
};