Technical facts

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.9.2

Libraries used:

STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./CppQVector2DExample1/CppQVector2DExample1.pro


include(../../ConsoleApplication.pri) #Or use the code below

# 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

# }



include(../../Libraries/Boost.pri) #Or use the code below

# win32 {

#   INCLUDEPATH += \

#     ../../Libraries/boost_1_54_0

# }



SOURCES += main.cpp

./CppQVector2DExample1/main.cpp


#include <cassert>



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

#pragma GCC diagnostic ignored "-Wunused-variable"

#include "QVector2D"

#pragma GCC diagnostic pop



int main()

{

  {

    //Basics

    QVector2D p;

    p.setX(1.0);

    p.setY(2.0);

    assert(p.x() == 1.0);

    assert(p.y() == 2.0);

  }

  {

    //distanceToPoint

    const QVector2D a(3.0,4.0);

    assert(qFuzzyCompare(static_cast<float>(5.0),a.distanceToPoint(QVector2D(0.0,0.0))));

  }

  {

    //dotProduct

    //From https://en.wikipedia.org/wiki/Dotproduct

    //'In particular, if A and B are orthogonal, then [...] A dot b = 0'

    const QVector2D a(1.0,0.0);

    const QVector2D b(0.0,1.0);

    const double p { QVector2D::dotProduct(a,b) };

    const double q { QVector2D::dotProduct(b,a) };

    const double expected { 0.0 };

    assert(qFuzzyCompare(p,expected));

    assert(qFuzzyCompare(q,expected));

  }



}

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(C++) QVector2DExample1

Technical facts

Qt project file: ./CppQVector2DExample1/CppQVector2DExample1.pro

./CppQVector2DExample1/main.cpp