Qt Yin Yang Symbol

Source code:

#include <QApplication>

#include <QGraphicsScene>

#include <QGraphicsView>

#include <QGraphicsEllipseItem>

int main(int argc, char *argv[])

{

    QApplication app(argc, argv);

    QGraphicsScene scene;

    scene.setSceneRect( 0.0, 0.0, 200.0, 200.0 );

    QBrush whiteBrush(Qt::white);

    QBrush blackBrush(Qt::black);

    QPen blackPen(Qt::black);

    blackPen.setWidth(3);

    QPen whitePen(Qt::white);

    whitePen.setWidth(3);

    scene.addEllipse(0,0,200,200,blackPen,blackBrush); //big circle

    QPainterPath rightWhiteSemicirclePath;

    rightWhiteSemicirclePath.arcMoveTo(0+3, 0+3, 200-2*3, 200-2*3, 90);

    rightWhiteSemicirclePath.arcTo(0+3, 0+3, 200-2*3, 200-2*3, 90, -180);

    scene.addPath(rightWhiteSemicirclePath,whitePen,whiteBrush);

    QPainterPath leftUpperSmallWhiteSemicirclePath;

    //circle contains in the square shape

    //square length is 100-3=97

    //move the small square x position left (1/4*200)+3=53 pixels

    leftUpperSmallWhiteSemicirclePath.arcMoveTo(50+3, 0+3, 100-3, 100-3, -90);

    leftUpperSmallWhiteSemicirclePath.arcTo(50+3, 0+3, 100-3, 100-3, -90, -180);

    scene.addPath(leftUpperSmallWhiteSemicirclePath,whitePen,whiteBrush);

    QPainterPath rightLowerSmallBlackSemicirclePath;

    rightLowerSmallBlackSemicirclePath.arcMoveTo(53-3, 100+3, 100-3, 100-3, 90);

    rightLowerSmallBlackSemicirclePath.arcTo(53-3, 100+3, 100-3, 100-3, 90, -180);

    scene.addPath(rightLowerSmallBlackSemicirclePath,blackPen,blackBrush);

    scene.addEllipse(100-12.5,  50-12.5, 25, 25, blackPen, blackBrush); //small black upper circle

    scene.addEllipse(100-12.5, 150-12.5, 25, 25, whitePen, whiteBrush); //small white lower circle

    QGraphicsView view( &scene );

    view.setFixedSize(300,300);

    view.setWindowTitle("My Yin Yang Symbol");

    view.show();

    return app.exec();

}

Result: 

 ☯

Qt Smiley

☺

ClipsTab (ClipsTab = Clips + Protege) Installation Steps

Step: Download and install Protege v3.4.7 from
http://protege.stanford.edu/download/protege/3.4/installanywhere/Web_Installers/.
Choose without Java VM if you have installed Java Virtual Machine already.

Step: Download and extract ClipsTab zip file from
http://protege.stanford.edu/plugins/CLIPSTabPages/clipstab.zip.
ClipsTab zip file contains two files. The files are clipstab.jar and ProtegeCLIPSInterface.dll.
Create a folder in the "C:\Program Files\Protege_3.4.7\plugins" and name the folder as "ClipsTab".
Copy clipstab.jar to the "C:\Program Files\Protege_3.4.7\plugins\ClipsTab" folder.
Copy ProtegeCLIPSInterface.dll to the "C:\Program Files\Protege_3.4.7" folder.

Step: In the "C:\Program Files\Protege_3.4.7\plugins\ClipsTab" folder, create a text file
and name the file as "plugin.properties".
Type the following text into the "plugin.properties" file:
--
plugin.component.count=1
plugin.component.name.0=ClipsTab Plugin
plugin.component.about.0=http://protege.stanford.edu/plugins/CLIPSTabPages/CLIPS_tab.html
plugin.component.doc.0=http://protege.stanford.edu/plugins/CLIPSTabPages/docs/index.html
plugin.dependency.count=2
plugin.dependency.0=edu.stanford.smi.protegex.owl
plugin.dependency.1=edu.stanford.smi.protegex.pal_tabs
--

Step: Download and extract Clips v6.24 zip file (windows_executables_624.zip) from
http://sourceforge.net/projects/clipsrules/files/CLIPS/6.24/.
Copy the following four files one file "clips.hlp, CLIPS6.HLP, clipsdos.exe, and CLIPSWin.exe" from the extracted Clips zip file to
the "C:\Program Files\Protege_3.4.7\plugins\ClipsTab" folder.

Step: Click [Start > All Programs > Protege_3.4.7 > Protege] to open Protege program.
On the Protege program, tick "CLIPSTab" and then click OK to enable the "CLIPS tab" under
[Menu > Project > Configure... > TabWidgets tab].

Simple Qt Console Application

• Click Start Menu > All Programs > Qt SDK > Qt Creator to open Qt 4 C++ Editor.
  
• On Qt Creator, click Menubar > File > New File or Project... Ctrl+N to create a new project.
• At LHS panel, Choose a template: Other Project. At RHS panel, click Qt Console Application. Click "Choose..." button to create a project containing a single main.cpp file with a stub implementation.
• Give the file a name as "cpp_simple_hello_world". Create in: D:\ws_qt. Click Next button to continue.
• Uncheck "Qt 4.7.3  for Desktop - MSVC2008 (Qt SDK) debug" and "Qt 4.7.3  for Desktop - MSVC2008 (Qt SDK) release" if there is any. Click Next button to continue.
• Click Finish.
• In the main.cpp file, enter the following source code for the file content.

---------|---------|---------|---------|
#include <QtCore/QCoreApplication>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    cout << "Hello, World!" << endl;

    return a.exec();
}
---------|---------|---------|---------|

• Ctrl+R to run the Qt (cute, cutie, Q.T. pronunciation) console application.