Qt example 1: moving a sprite over a background in 2D is a Qt example that shows an image moving over a background image, like this screenshot (png).
Operating system(s) or programming environment(s)
Lubuntu 15.04 (vivid)
Qt Creator 3.1.1
- G++ 4.9.2
Libraries used:
Qt project file: ./CppQtExample1/CppQtExample1.pro
exists (../../ConsoleApplication.pri) { include(../../ConsoleApplication.pri) } !exists (../../ConsoleApplication.pri) { QT += core QT += gui greaterThan(QT_MAJOR_VERSION, 4): QT += widgets CONFIG += console CONFIG -= app_bundle TEMPLATE = app CONFIG(release, debug|release) { DEFINES += NDEBUG NTRACE_BILDERBIKKEL } QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++ unix { QMAKE_CXXFLAGS += -Werror } } exists(../../Libraries/Boost.pri) { include(../../Libraries/Boost.pri) } !exists(../../Libraries/Boost.pri) { win32 { INCLUDEPATH += \ ../../Libraries/boost_1_55_0 } } RESOURCES += CppQtExample1.qrc SOURCES += main.cpp
#include <string> #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #include <boost/shared_ptr.hpp> #include <QApplication> #include <QBitmap> #include <QGraphicsPathItem> #include <QGraphicsPixmapItem> #include <QGraphicsScene> #include <QGraphicsView> #include <QTimer> #pragma GCC diagnostic pop struct Background : public QGraphicsPixmapItem { explicit Background(const std::string& filename) { QPixmap m(filename.c_str()); this->setPixmap(m); } }; struct TransparentSprite : public QGraphicsPixmapItem { explicit TransparentSprite( const std::string& filename, const QColor& transparency_color = QColor(0,255,0)) //Lime green : dx(1), dy(1), maxx(320), maxy(200) { QPixmap pixmap(filename.c_str()); const QBitmap mask = pixmap.createMaskFromColor(transparency_color); pixmap.setMask(mask); this->setPixmap(pixmap); } void advance(int) { int new_x = this->x(); int new_y = this->y(); new_x+=dx; new_y+=dy; if (new_x<0 || new_x>maxx) dx= -dx; if (new_y<0 || new_y>maxy) dy= -dy; this->setX(new_x); this->setY(new_y); } void setRect(const int width, const int height) { maxx = width - this->pixmap().width(); maxy = height - this->pixmap().height(); } private: int dx; int dy; int maxx; int maxy; }; int main(int argc, char *argv[]) { QApplication a(argc, argv); QGraphicsScene s; QGraphicsView v(&s); //Original image from http://commons.wikimedia.org/wiki/File:Bubblegum_2.png //by Marendo Mueller 10.05.2013, resized to 15% Background background(":/images/Bubblegum_2.png"); s.addItem(&background); //Image from http://commons.wikimedia.org/wiki/File:Bloem.png //by DD21 TransparentSprite sprite(":/images/Bloem.png"); sprite.setRect(background.pixmap().width(),background.pixmap().height()); s.addItem(&sprite); v.show(); boost::shared_ptr<QTimer> timer(new QTimer(&s)); timer->connect(timer.get(), SIGNAL(timeout()), &s, SLOT(advance())); timer->start(10); return a.exec(); }