INSTALL CGAL on ubuntu and use it in qt

Recently, i have read a paper named "as rigid as possible surface modeling", when I turned to its project web page, the author told us it had been implemented in CGAL. So with having a try mind, I decide to study this lib.

let us introduce how to install CGAL on ubuntu:

For instance in debian/Ubuntu, use apt-get in the following way:

sudo apt-get install libcgal-dev

To get the demos use

sudo apt-get install libcgal-demo

After installing, let us try to program the first example in qt.

.pro file looks like below:

#-------------------------------------------------
#
# Project created by QtCreator 2016-01-28T13:29:40
#
#-------------------------------------------------

QT += core

QT -= gui

TARGET = TestCGAL
CONFIG += console
CONFIG -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

LIBS += -L/lib64 -lgmp -lCGAL
QMAKE_CXXFLAGS += -frounding-math -O3

the content of main.cpp is as follow:

#include <iostream>
#include <CGAL/Simple_cartesian.h>
typedef CGAL::Simple_cartesian<double> Kernel;
typedef Kernel::Point_2 Point_2;
typedef Kernel::Segment_2 Segment_2;
int main()
{
Point_2 p(1,1), q(10,10);
std::cout << "p = " << p << std::endl;
std::cout << "q = " << q.x() << " " << q.y() << std::endl;
std::cout << "sqdist(p,q) = "
<< CGAL::squared_distance(p,q) << std::endl;

Segment_2 s(p,q);
Point_2 m(5, 9);

std::cout << "m = " << m << std::endl;
std::cout << "sqdist(Segment_2(p,q), m) = "
<< CGAL::squared_distance(s,m) << std::endl;
std::cout << "p, q, and m ";
switch (CGAL::orientation(p,q,m)){
case CGAL::COLLINEAR:
std::cout << "are collinear\n";
break;
case CGAL::LEFT_TURN:
std::cout << "make a left turn\n";
break;
case CGAL::RIGHT_TURN:
std::cout << "make a right turn\n";
break;
}
std::cout << " midpoint(p,q) = " << CGAL::midpoint(p,q) << std::endl;
return 0;
}

the result is shown in the pic: