(C++ Qt Creator) Moving line

February 24, 2017 · View on GitHub

 

 

 

 

 

(C++ Qt Qt Creator) Moving line

 

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