Category Archives: Graphs

Exploring Fourier Series with Ruby

There is scope for refactoring in this port(such as replacing each with more powerful methods). My first priority was to get it working. Now that it does, I will refactor the code sometime soon, hopefully.

I ported the code from the Python for Fun series’ article entitled Waves and Harmonics. This port still has some rough edges, no pun intended, and not tested very well(see the disclaimers below). It is located on the Box widget to your left with the label ploty.rb. It can be run by typing in ruby ploty.rb. The code is licensed under GPLv2

To actually “explore the Fourier series”, please go ahead and read the original article above. I don’t have the time and patience to go into that after porting this thing–the Ruby/Tk canvas binding was not that intuitive to me(which is rare, most ruby packages I have run into are very intuitive). I had to hunt and peck through Google to find out more about TkcLine, etc.

It turns out, that this is a good collection of scripts–just source code–mostly English, some Japanese strings are there sometimes:

http://lecture.ecc.u-tokyo.ac.jp/~shagiya/progs/

Here’s a screenshot

picture-1.png

Unfortunately, the Mac version doesn’t take advantage of anti-aliased rendering.

NO WARRANTY

  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.

  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
Advertisements

Drawing Graphs(Graph theory) with Cocoa

Update: I am working on a little app that makes it convenient to use dot, neato, and twopi tools that come with GraphViz.

There is the popular GraphViz library and associated tools for generating graphs in a lot of environments. However, to have a little bit of fun, we can start with some code provided by Aaron Hillegass on his Big Nerd Ranch weblog(scroll down to the bottom). I think the main purpose of his code is actually not to explain how to draw graphs but to demonstrate some of the nice features of PyObjC.

Tip: You should actually create a fresh Xcode project based on Aaron’s source code if you don’t want to mess with PyObjC.