/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.t6Vvemjih6Z/rev.945
 * 
 * authors: 
 *   Babele Dunnit

 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 



// Pressing Control-R will render this sketch.

int i = 0; 



void setup() {  // this is run once.   
        
    // set the background color
    background(255);
    
    // specify canvas size
    size(800, 800); 
      
    // smooth edges
    smooth();
    
    // limit the number of frames per second
    frameRate(50);
    
    // set the width of the line. 
    strokeWeight(20);
    
    ellipse( width / 2, height/ 2, 20, 20 );
} 

bool hasDivisor(int n)
{
    for(int i = 2; i < sqrt(n); i++)
        if(n % i == 0)
            return true;
            
    return false;
}
    

circlelen = 6;
multsix = 1;
float deltatheta = TWO_PI / 6.0;
float theta = 0.0;

void draw() {  // this is run repeatedly.  

    if(i > 2000)
        return;
        
    if(i == circlelen)
    {
        multsix++;
        circlelen += (6 * multsix);
        deltatheta /= 2.0;
    }

    // set the color
    // stroke(random(50), random(255), random(255), 100);
    
    // ogni volta che entro disegno un dot
    
    centerx = width / 2;
    centery = height / 2;
    
    // theta += /*i * */  TWO_PI / (6.0 * multsix);
    theta = i * TWO_PI / (6.0 * multsix);
    rho = 35 * multsix;
    
    // trasformazza polazza-cartesiazza
    x = rho * cos(theta) + centerx;
    y = rho * sin(theta) + centery;
    
    if(hasDivisor(i))
        stroke(0, 255, 0, 100);
    else
        stroke(255, 0, 0, 100);
    
    
    //line(x, y, x, y);
    ellipse(x,y,15,15);
    text(str(i), x, y);
    
    print(x);
    
    i++;
    
}