Can you explain in a little more detail what you want?  I can see the data[] array contains angles in radians, but then your function Segmention1() draws an arc of a fixed angle (PI/16).  The program creates one small arc in the window.

I think you want it to do something with the values in data[], but what exactly?

Is this closer to what you want?  The segment() method draws an arc segment between two different angles; you could change those dynamically with a variable.

Code:

float xpos; 
float ypos;
int sz;
int strokesize;
float angle1; 

void setup() {
  frameRate(12);
  size(1900,1000);
  colorMode(HSB,255,255,255);
  ellipseMode(RADIUS);
  strokeCap(SQUARE);
  //noFill();
  xpos =0;
  ypos = 0;
  sz = width/8;
  strokesize = width/10;
}

void draw() {
  background(255);
  translate(width/2,height/2);
  segment(0, PI/6);
  segment(2*PI/6, 3*PI/6);
  segment(4*PI/6, 5*PI/6);
  segment(6*PI/6, 7*PI/6);
  segment(8*PI/6, 9*PI/6);
  segment(10*PI/6, 11*PI/6);  
}


void segment(float angle1, float angle2) {
  stroke(255, 0, 0,255);
  strokeWeight(strokesize);
  arc(xpos, ypos, sz, sz, angle1, angle2);
} 
 

Hi jirko,

I've been playing around with the arc() function as well. If you're interested you can read a blogpost I wrote about it here. It might show you some of the possibilities of arc().

http://amnonp5.wordpress.com/2010/05/08/the-beauty-of-arcs

I have two tips for you:

1. Use radians() with degrees instead of PI-values. I think it's a lot easier.
2. I think using a FOR loop here is probably easier than an array.

Here is some code to show what I mean by these two suggestions.

Code:

int segments = 4;

void setup() {
  size(500,500);
  smooth();
}

void draw() {
  background(255);
  noFill();
  strokeWeight(15);
  strokeCap(SQUARE);
  translate(width/2,height/2);

  // using the radians() function means you can use 360 degrees,
  // which simplifies the math a lot
  stroke(0);
  arc(10, 10, 100, 100, radians(0), radians(90));
  arc(-10, 10, 100, 100, radians(90), radians(180));
  arc(-10, -10, 100, 100, radians(180), radians(270));
  arc(10, -10, 100, 100, radians(270), radians(360));

  // using a FOR loop makes it easier to draw a number of
  // similar shapes like this one
  for (int i=0; i<segments; i++) {
    stroke(i*100,255-i*50,0);
    arc(0, 0, 200, 200, radians(i*90), radians((i+1)*90));
  }

}
 

Now perhaps you could play around with the segments value and change some of the arc-math accordingly to make it all work the way you want to. Good luck!

Hey guys,
thanks a lot , very helpful! Enough to get the ball rolling.  

Cheers

J