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: ./CppQPixmapExample1/CppQPixmapExample1.pro


win32 {

  # Windows only

  message("Console application, built for Windows")

  QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++

}



macx {

  # Mac only

  message("Console application, built for Mac")

  QMAKE_CXXFLAGS = -mmacosx-version-min=10.7 -std=gnu0x -stdlib=libc+

  CONFIG +=c++11

}



unix:!macx{

  # Linux only

  message("Console application, built for Linux")

  QMAKE_CXXFLAGS += -Werror

  QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++

}



cross_compile {

  # Crosscompile only

  message("Console application, cross-compiling from Linux to Windows")

  QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++

}





# Go ahead and use Qt.Core: it is about as platform-independent as

# the STL and Boost

QT += core



# Go ahead and use Qt.Gui: it is about as platform-independent as

# the STL and Boost. It is needed for QImage

QT += gui



# Don't define widgets: it would defy the purpose of this console

# application to work non-GUI

#greaterThan(QT_MAJOR_VERSION, 4): QT += widgets



CONFIG   += console

CONFIG   -= app_bundle

TEMPLATE = app



#

#

# Type of compile

#

#



CONFIG(release, debug|release) {

  DEFINES += NDEBUG NTRACE_BILDERBIKKEL

}



SOURCES += main.cpp

./CppQPixmapExample1/main.cpp


#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 <QImage>

#include <QPixmap>

#pragma GCC diagnostic pop



QPixmap CreatePixmap(const int width, const int height, const int z)

{

  QPixmap pixmap(width,height);

  QImage image = pixmap.toImage();

  for (int y=0;y!=height;++y)

  {

    for (int x=0;x!=width;++x)

    {

      image.setPixel(

        QPoint(x,y), //Position

        qRgb((x+z+0)%256,(y+z+0)%256,(x+y+z)%256) //Color



        /*

        QColor( //Color

          (x+z+0)%256,

          (y+z+0)%256,

          (x+y+z)%256)

        .rgb()

        */

      );

    }

  }

  pixmap = QPixmap::fromImage(image);

  return pixmap;

}



int main()

{

  //Cannot create a QPixmap here, because of the following error:

  //

  //  QPixmap: Must construct a QApplication before a QPaintDevice

  //



  //QPixmap pixmap = CreatePixmap(32,32,128);



  //pixmap.save("CppQPixmapExample1.png");

  //QImage image = pixmap.toImage();

  //image.save("CppQPixmapExample1.png");





}

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(C++) QPixmapExample1

Technical facts

Qt project file: ./CppQPixmapExample1/CppQPixmapExample1.pro

./CppQPixmapExample1/main.cpp