Moving line is a Qt example to do 2D graphics like this screenshot.


#include <cstdlib>

#include <QApplication>

#include <QGraphicsPathItem>

#include <QGraphicsScene>

#include <QGraphicsView>

#include <QTimer>



class QUpdatingPathItem : public QGraphicsPathItem {

  void advance(int phase) {

    if (phase == 0) return;

    int x = std::abs(std::rand()) % 100;

    int y = std::abs(std::rand()) % 100;

    QPainterPath p = path();

    p.lineTo(x, y);

    setPath(p);

  }

};



//Code adapted from

// * http://stackoverflow.com/questions/1173525/c-and-qt-problem-with-2d-graphics

//Thanks to Wuub:

// * http://stackoverflow.com/users/92874/wuub (Wuub's StackOverflow profile)

// * http://wuub.net (Wuub's homepage)

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

{

  QApplication a(argc, argv);

  QGraphicsScene s;

  QGraphicsView v(&s);



  QUpdatingPathItem item;



  s.addItem(&item);



  v.show();



  QTimer * const timer = new QTimer(&s);

  timer->connect(timer, SIGNAL(timeout()), &s, SLOT(advance()));

  timer->start(100);



  return a.exec();

}

Project file:


#-------------------------------------------------

#

# Project created by QtCreator 2010-05-01T11:16:04

#

#-------------------------------------------------

TARGET = ProjectQtMovingLine

CONFIG   += console

CONFIG   -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

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(C++ Qt Creator) Moving line