(C++) QGraphicsSvgItemExample3

 

Technical facts

 

Application type(s)

• Desktop application

Operating system(s) or programming environment(s)

• Lubuntu 15.04 (vivid)

IDE(s):

• Qt Creator 3.1.1

Project type:

• GUI application

C++ standard:

• C++11

Compiler(s):

• G++ 4.9.2

Libraries used:

• Qt: version 5.4.1 (32 bit)
• STL: GNU ISO C++ Library, version 4.9.2

 

 

 

 

 

Qt project file: ./CppQGraphicsSvgItemExample3/CppQGraphicsSvgItemExample3.pro

 

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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 \     mygraphicsview.cpp HEADERS += \     mygraphicsview.h

 

 

 

 

 

./CppQGraphicsSvgItemExample3/mygraphicsview.h

 

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#ifndef MYGRAPHICSVIEW_H #define MYGRAPHICSVIEW_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 QWheelEvent; class MyGraphicsView : public QGraphicsView {   Q_OBJECT   public:   MyGraphicsView(QWidget *parent = 0);   MyGraphicsView(const MyGraphicsView&) = delete;   MyGraphicsView& operator=(const MyGraphicsView&) = delete;   void wheelEvent(QWheelEvent *event); }; #endif // MYGRAPHICSVIEW_H

 

 

 

 

 

./CppQGraphicsSvgItemExample3/mygraphicsview.cpp

 

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#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 "mygraphicsview.h" #include <QWheelEvent> #pragma GCC diagnostic pop MyGraphicsView::MyGraphicsView(QWidget *parent)   : QGraphicsView(parent) { } void MyGraphicsView::wheelEvent(QWheelEvent *event) {   const double new_scale = 1.0 + (static_cast<double>(event->delta()) / 1000.0);   this->scale(new_scale,new_scale); }

 

 

 

 

 

./CppQGraphicsSvgItemExample3/qtmain.cpp

 

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#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 <fstream> #include <QApplication> #include <QGraphicsScene> #include <QGraphicsSvgItem> #include "mygraphicsview.h" #pragma GCC diagnostic pop int main(int argc, char *argv[]) {   QApplication a(argc, argv);   const std::string filename = "tmp.svg";   {     std::ofstream f(filename.c_str());     //Use '*(' and ')*' as delimiters     f       << R"*(<svg xmlns="http://www.w3.org/2000/svg" version="1.1">)*"       << R"*(<rect width="150" height="150" fill="rgb(0, 255, 0)" stroke-width="1" stroke="rgb(0, 0, 0)" />)*"       << R"*(</svg>)*";   }   QGraphicsSvgItem i(filename.c_str());   i.setScale(0.25);   QGraphicsScene s;   s.addItem(&i);   MyGraphicsView w;   w.setGeometry(100,100,200,200);   w.setScene(&s);   w.show();   return a.exec(); }