Emergence - OpenProcessing

sketch210668
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/* Based on CREATIVE CODING course,  MONASH UNIVERSITY
​
 MOVE CIRCLES IN A STRIGHT LINE AND CONSTRAIN TO SURFACE.
 IF TWO CIRCLES INTERSECT DRAW A LINE CONNECTING THEIR CENTERS,
 CLOURING THE LINE BASED ON THE CIRCLE BEING ODD OR EVEN
​
 ARROW UP = INCREASE RADIUS OF CIRCLE
 ARROW DOWN = DECREASE RADIUS OF CIRCLE */
​
​
int n = 50; // NUMBER OF CIRCLES
float[] x = new float[n];
float[] y = new float[n];
float[] d = new float[n]; // RADIUS OF THE CIRCLES
float[] moveX = new float[n];
float[] moveY = new float[n];
​
void setup() {
  size(800, 500);
  background(255);
  stroke(0, 10);
  noFill();
  smooth();
  for (int i = 0; i<n; i++) { //ASSIGN VALUES TO VARIABLES
    x[i]=random(width);
    y[i]=random(height);
    d[i]=random(20, 80);
    // CALL FUNCTIONS
    moveX[i]=random(-1, 1);
    moveY[i]=random(-1, 1);
  }
  println(d); //SHOW RADIUS
}
​
void draw() {
  for (int i = 0; i<n; i++) {
    moveCircle(i);
    connectCircle(i);
  }
}
​
//#######  FUNTIONS  ###############
​
// MOVE CIRCLES IN A STRIGHT LINE AND CONSTRAIN TO SURFACE
void moveCircle(int i) {
  x[i]=x[i]+moveX[i];
  y[i]=y[i]+moveY[i];
  //  ellipse(x[i], y[i], d[i], d[i]);
​
  if (x[i]>width || x[i]<0) {
    moveX[i]= moveX[i]>0 ? -random(-1, 1) : random(-1, 1);
  }
  if (y[i]>height || y[i]<0) {
    moveY[i] = moveY[i]>0 ? -random(-1, 1) : random(-1, 1);
  }
}
​
// IF TWO CIRCLES INTERSECT THEN DRAW A LINE CONNECTING THEIR CENTERS,
//CLOURING THE LINE BASED ON THE CIRCLE BEING ODD OR EVEN
void connectCircle(int i) {
  for (int j = 0; j<n; j++) {
    if (j!=i) {
      if (dist(x[i], y[i], x[j], y[j])<(d[i]+d[j])) {
        if (i%2==0) {
          stroke(255, 10);
        } else {
          stroke(0, 10);
        }
        line(x[i], y[i], x[j], y[j]);
      }
    }
  }
}
​
// MODIFY RADIUS OF CIRCLES, SAVE AND REFRESH 
void keyPressed() {
  if (keyCode == UP) {
    for (int i = 0; i <n; i++) {
      d[i]++;
    }
    println(d);
  }
  if (keyCode == DOWN) {
    for (int i = 0; i <n; i++) {
      d[i]--;
    }
    println(d);
  }
​
  if (key == 'r') {
    background(255);
  }
​
  if (key == 's') {
    saveFrame("######.png");
  }
}