Shine a light

Nikolaus Gradwohl2008-09-29T21:27:00+02:00

here is another little processing-sketch. this one is dedicated to everybody who wants to shine a litte light

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rotating box in openframeworks

Nikolaus Gradwohl2008-09-29T19:17:00+02:00

I tried to write something simmilar to my neonbox-demo in openframeworks. At first a have been a bit puzzled because there is no rotate command.

Then i remembered that openframeworks uses OpenGL for drawing so glRotatef and glTranslatef can be used for rotating the image

int ang = 0;

void testApp::setup(){
    ofSetVerticalSync( true );
    ofSetFrameRate( 25 );

void testApp::draw(){
    int width = ofGetWidth() / 2;
    int height = ofGetHeight() / 2;

    ofBackground( 0,0,0 );
    glTranslatef( width, height, 0 );
    glRotatef( ang , 0, 0, 1);

    if (ang == 360) {
        ang = 0;

    ofSetColor( 255 * ( 1 + sin( ang * 2 * PI / 360 )) / 2, 
        255 * ( 1 + sin( PI + ang * 2 * PI / 360 )) / 2, 0 );

    ofRect(  -300,  -50, 100, 100 );
    ofRect(  -100,  -100, 200, 200 );
    ofRect(  200,  -50, 100, 100 );


This time i also made a little screenshot for those who don't have openframeworks installed (yet :-) )


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Zoom'n'Pan Demo

Nikolaus Gradwohl2008-09-27T16:43:00+02:00

A colleague asked me how zoom and pan could be implemented in processing. So i wrote a small "zoom'n'pan"-demo

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typo on debian

Nikolaus Gradwohl2008-09-27T12:10:00+02:00

Yesterday i have installed typo on a debian box. First i installed ruby, rails, mongrel, rake and gem - and when i wanted to install typo it told me that it didnt like my rails version :-/

so i installed rails 2.0.2 and then typo. After installing the blog, and configuring apache (i haaaaaaate mod_proxy rewrites in apache - i cant tell you how much!) typo thrwe some exceptions every time i wanted to write an article.


after googleling for some time, i found out that rails 2.0.2 isnt working with ruby 1.8.7. Instructions how to downgrade ruby can be found here and instructions how to keep debian from upgrading it again can be found here

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Nikolaus Gradwohl2008-09-22T07:45:00+02:00

I recently read about disco a implementation of the map-reduce algorithm using erlang for the master node and the workload management and python for the map-reduce jobs. Its realy funny that the nokia research labs implemented an algorithm introduced by google using a language developed by erricsson :-)

its a bit complicated to install, but once running its realy fun to code with

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ReportLab Test

Nikolaus Gradwohl2008-09-10T09:03:00+02:00

I just have tested reportlab a python-framework for pdf generation.

from reportlab.pdfgen import canvas
from reportlab.lib.units import cm

c = canvas.Canvas("hello.pdf")

c.drawString(2*cm,28*cm,"Hello World")

c.line( 2*cm, 26*cm, 2*cm, 16*cm)
c.line( 2*cm, 16*cm, 12*cm, 16*cm )

c.setFillColorRGB( 0, 0, 1 )
c.rect( 2.5*cm, 16*cm, 1.5*cm, 7*cm, fill = 1 )
c.setFillColorRGB( 0, 1, 0 )
c.rect( 4.5*cm, 16*cm, 1.5*cm, 6*cm, fill = 1 )
c.setFillColorRGB( 1, 0, 0 )
c.rect( 6.5*cm, 16*cm, 1.5*cm, 8*cm, fill = 1 )


this little script generates a pdf containing 'hello world' and a simple bar-chart. i think i will give it a try if i have to generate pdf-reports the next time

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Rotating NeonBox

Nikolaus Gradwohl2008-09-06T16:26:00+02:00

i have hacked together my next processing sketch. This time its a rotating NeonBox.

dont wait for something sophisticated to happen its just a little rotating box :-)

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'Hello World' in 80 hacks / In 80 Sprachen 'Hallo Welt' - Phase 2 started

Nikolaus Gradwohl2008-09-06T10:29:00+02:00

As posted erlier, i'm working on a project to code a "hello world"-Application consisting of 80 programing languages.

I have started "phase 2 (planning)". The program will be seperated into 10 blocks that are executed parallel. Each block generates one letter and handles one of the following topics: * xml * webapp * webservice * sound * filetransfer (csv, fixlength-records, ... ) * pixelgraphic * vector graphic * cryptography * robotics * textdocuments ( rtf, doc, pdf, ... )

more infos can be found on the project-page

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SuperCollider on Linux

Nikolaus Gradwohl2008-08-17T09:35:00+02:00

Today i have installed supercollider on my ubutu system following this instructions. SuperCollider is a environment and programming language for audio synthesis simliar to chuck. SuperCollider can run on a network and uses OSC events for comunication.

After looking around in the source tree i found a plugin for vim :-)

Installations is a bit quirky (the folders 'ftpplugin', 'syntax' and 'intend' needed to be copied to ~/.vim by hand) but now i can edit my sc code using my vim - veeeery cool :-)

single lines of code can be sent to the server using F6 codeblocks are sent to the server using F5.

c = { arg f=900;
    var x;
    x =;
    x * 0.1

c.set(, 400);
c.set(, 670);

to start te server the first line has to be sent to sclang (using F6). Then the code block starting line 2 is sent to the server (using F5)... tata - a sine wave.

sending the last 2 lines (F6 again) change the frequency of the running synth.

F12 can be used to turn all sounds off.

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Parallax v2.0

Nikolaus Gradwohl2008-08-12T20:56:00+02:00

Because of the OVERWHELMING amount of reader comments - aehm, i mean compared to my other blogposts - i have decided to code another version of my Parallax scrolling demo (v2.0) containing a jumping white rabbit

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