CGAL users discussion list

[John Doe <>]

Dear All

Other MAC users will likely encounter my problems.  So for

posterity (anyone facing this)

"CGAL developers are not involved in the creation of the macport or

homebrew packages"

Love it. It sounds like "We don't wan' yo' kind round here" :-)

but I am thankful for the info given to me. I can see that

CGAL is primarly aimed for Linux.

From the MAC to that first example:

Thanks to info gleaned from various sources on the web

especially David Dumas.

My comments and actions are marked with ->

-> Installation:

-> From http://doc.cgal.org/latest/Manual/installation.html#title3

sudo port install cgal

sudo port install cgal +qt5 +universal +demos

-> From the forum, I found out that this download applies to the MAC as well as Linux:

   

-> I created documents/CGAL where I put CGAL-4.7.tar.gz

cd Documents/CGAL

tar xzf CGAL-4.7.tar.gz

-> From http://doc.cgal.org/latest/Manual/installation.html

-> My MAC already had cmake

-> The following are commands I tentatively tried that were accepted:

cd Documents/CGAL

cd CGAL-4.7

cmake -gui

# Note the space before the -gui

cmake .

make

make examples

make demos

-> Then I moved to my first example:

cd examples/Convex_hull_2

-> It took a lot of other people's pain to figure to compile 

-> and link the compiled code to the appropriate libraries

-> http://stackoverflow.com/questions/8404968/compiling-a-basic-cgal-program-in-c-on-mac-os-x-10-7-2

-> http://stackoverflow.com/questions/24395068/compiling-cgal-programs-on-mac-installed-using-macports

g++ -L/opt/local/lib -lcgal -I/opt/local/include/ -lgmp  ch_from_cin_to_cout.cpp

-> The above worked. To run the code: follow MCS 481 David Dumas

-> http://homepages.math.uic.edu/~ddumas/teaching/2014/spring/mcs481/cgal-example/

./a.out < ch_from_cin_to_cout.cin > hull.txt

-> I installed gnuplot with macports

gnuplot

set term png

set output "input.png"

set title "Points"

set size square

set key off

set xrange [-1000:9000]

set yrange [-1000:9000]

plot "ch_from_cin_to_cout.cin" w p ps 0.25

exit gnuplot

cp hull.txt hull_closed.txt

head -1 hull.txt >> hull_closed.txt

gnuplot

set term png

set output "output.png"

set title "Convex Hull"

set size square

set key off

set xrange [-1000:9000]

set yrange [-1000:9000]

plot "ch_from_cin_to_cout.cin" w p ps 0.25, \

     "hull_closed.txt" w p ls 3, \

     "" w l

exit gnuplot

====

So finally I get input.png and output.png which shows the convex hull

(convex envelope) around the data points in "ch_from_cin_to_cout.cin".

I could use some advice w.r.t. getting Scilab to work with CGAL

on the MAC.  Apparently this can be done.

best wishes

Tony