Вот, вроде двигаются:
| Код |
#ifndef SCENE_H
#define SCENE_H
#include <QGraphicsScene>
#include <QList>
class QGraphicsItemGroup;
class Scene: public QGraphicsScene {
Q_OBJECT
public:
Scene();
public slots:
void animate();
private:
QList<QGraphicsItemGroup*> groups;
};
#endif // SCENE_H
|
| Код |
#include "scene.h"
#include <math.h>
#include <QGraphicsItem>
Scene::Scene()
: QGraphicsScene(0)
{
setBackgroundBrush(QBrush(Qt::black));
QBrush brush(Qt::white);
QPen pen(brush, 3);
QList<QGraphicsItem*> items;
// A
items << addLine(50, 50, 90, 50, pen)
<< addLine(70, 20, 70, 50, pen)
<< addEllipse(70 - 10, 62 - 10, 20, 20, pen, brush);
groups << createItemGroup(items);
// B
items.clear();
items << addLine(100, 50, 140, 50, pen)
<< addLine(120, 50, 120, 70, pen)
<< addEllipse(120 - 10, 60 - 10, 20, 20, pen, brush);
groups << createItemGroup(items);
// C
items.clear();
items << addLine(200, 50, 260, 50, pen)
<< addLine(210, 40, 210, 60, pen)
<< addLine(250, 40, 250, 60, pen)
<< addEllipse(230 - 8, 60 - 8, 16, 16, pen, brush);
groups << createItemGroup(items);
// D
items.clear();
items << addLine(300, 50, 330, 80, pen)
<< addLine(330, 80, 360, 50, pen)
<< addLine(330, 80, 330, 50, pen)
<< addEllipse(330 - 10, 80 - 10, 20, 20, pen, brush);
groups << createItemGroup(items);
}
double drand()
{
return (double)rand()/(double)RAND_MAX;
}
void Scene::animate()
{
qreal stepSize = 5.0;
foreach(QGraphicsItemGroup *group, groups) {
group->translate(drand()*stepSize - 0.5*stepSize, drand()*stepSize - 0.5*stepSize);
}
}
|
| Код |
#include <QApplication>
#include <QGraphicsView>
#include <QTimer>
#include "scene.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Scene *scene = new Scene();
QGraphicsView *view = new QGraphicsView(scene);
view->setRenderHint(QPainter::Antialiasing, true);
view->resize(400, 300);
view->show();
QTimer timer;
QObject::connect(&timer, SIGNAL(timeout()), scene, SLOT(animate()));
timer.setInterval(30);
timer.start();
return a.exec();
}
|
|
