QGraphicsPixmapItem example 1: basic is a QGraphicsPixmapItem example. This example shows how to put multiple movable QGraphicsPixmapItems on screen. Note that the pixmaps are transparent, because the images supplied were transparent.
- View a screenshot of 'CppQGraphicsPixmapItemExample1' (png)
Download the Qt Creator project
'CppQGraphicsPixmapItemExample1' (zip)
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: ./CppQGraphicsPixmapItemExample1/CppQGraphicsPixmapItemExample1.pro
exists (../../DesktopApplication.pri) { include(../../DesktopApplication.pri) } !exists (../../DesktopApplication.pri) { QT += core printsupport QT += gui greaterThan(QT_MAJOR_VERSION, 4): QT += widgets svg 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 } } SOURCES += \ qtmain.cpp \ qtwidget.cpp \ qtitem.cpp HEADERS += \ qtwidget.h \ qtitem.h RESOURCES += \ CppQGraphicsPixmapItemExample1.qrc
#ifndef QTITEM_H #define QTITEM_H #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #pragma GCC diagnostic ignored "-Wunused-but-set-parameter" #include <QGraphicsPixmapItem> #pragma GCC diagnostic pop ///A QGraphicsPixmapItem that loads its pixmap from resources struct QtItem : public QGraphicsPixmapItem { QtItem(QGraphicsItem *parent = 0); }; #endif // QTITEM_H
#pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #pragma GCC diagnostic ignored "-Wunused-but-set-parameter" #include <cassert> #include <QPainter> #include "qtitem.h" #pragma GCC diagnostic pop QtItem::QtItem(QGraphicsItem *parent) : QGraphicsPixmapItem(parent) { assert(this->pixmap().isNull() && "Assume no pixmap loaded yet"); //Load the pixmap from resources this->setPixmap(QPixmap(":/images/PicR.png")); assert(!this->pixmap().isNull() && "Assume pixmap is loaded successfully"); this->setFlags(QGraphicsItem::ItemIsMovable); }
#pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #pragma GCC diagnostic ignored "-Wunused-but-set-parameter" #include <QApplication> #include "qtwidget.h" #pragma GCC diagnostic pop int main(int argc, char *argv[]) { QApplication a(argc, argv); QtWidget w; w.setGeometry(100,100,400,400); w.show(); return a.exec(); }
#ifndef QTWIDGET_H #define QTWIDGET_H #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #pragma GCC diagnostic ignored "-Wunused-but-set-parameter" #include <QGraphicsView> #pragma GCC diagnostic pop struct QtWidget : public QGraphicsView { QtWidget(); }; #endif // QTWIDGET_H
#pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #pragma GCC diagnostic ignored "-Wunused-but-set-parameter" #include <cassert> #include <QGraphicsScene> #include <QGraphicsPixmapItem> #include "qtitem.h" #include "qtwidget.h" #pragma GCC diagnostic pop QtWidget::QtWidget() { QGraphicsScene * const scene = new QGraphicsScene(this); this->setScene(scene); const int n_items = 64; for (int i=0; i!=n_items; ++i) { QtItem * const item = new QtItem; //Scatter those items around a bit item->setPos( - 128 + (std::rand() % 256), - 128 + (std::rand() % 256)); scene->addItem(item); } }