/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.qRLZY8Ed1J9/rev.1622
 * 
 * authors: 
 *   ManaT
 *   

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




int i, j;
int count;
int[] primes = {1,2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263,269,271,277,281,283,293,307,311,313,317,331,337,347,349,353,359,367,373,379,383,389,397,401,409,419,421,431,433,439,443,449,457,461,463,467,479,487,491,499};

void setup() {
    size(300,300);
    background(255);
    strokeWeight(0.4);
    i = 0;
    j = 0;
    count = primes.length-1;
}

void draw() {
    translate(-100,-100);
    if (count >= 0) {
        for (int k = 0; k < 20; k++) {
            if (i < 2000) {
                stroke(i/4, 50, 100, 60);
                PVector v1 = getPVectorFromInt((i)%2000);
                PVector v2 = getPVectorFromInt((i+500+primes[count])%2000);
                line(v1.x, v1.y, v2.x, v2.y);
                i += 25;
            } else {
                i = 0;
                count--;
            }
        }
    }
        
    if (j < 1000) {
        stroke(200, 200, 200, 255);
        line(j,0,0,j);
        line(500-j,0,500,j);
        j += 20;
    }
}

PVector getPVectorFromInt(int i) {
    if (i < 500) return new PVector(0, i);
    if (i < 1000) return new PVector(i-500, 500);
    if (i < 1500) return new PVector(500, 1500-i);
    if (i < 2000) return new PVector(2000-i, 0);
}