w3_06_jpv3

float[] x;

float[]y;      // current drawing position

float []dx;

float[] dy;    // change in position at each frame

float[] rad;       // radius for circle

int num;        // number of circles

​

​

void setup() {  

  size(500, 500);

​

 // colorMode(HSB);   //set colors to Hue, Saturation, Brightness mode

    background(180);  //set background white

  num = (int)random(50,100);

  x = new float[num];

  y = new float[num];

  dx = new float[num];

  dy = new float[num];

  rad = new float[num];

   //initial settings for the circles

 for (int i=0; i<num; i++){

 x[i] = random(50,450);  

 y[i] = random(50,450);

 rad[i] = random(25,50);  //size

   // dx and dy are the small change in position each frame

  dx[i] = random(-1, 1);

  dy[i] = random(-1, 1);

 }

 }

​

void draw() {  //draw function loops 

​

​

 noFill();

  for(int i=0; i<num; i++){

        // calculate new positions

  x[i] += dx[i];

  y[i] += dy[i];

 float max = 1;

  float min = 0.5;

​

  //When the shape hits the edge of the window, it reverses its direction and changes velocity

  if (x[i] > width-(rad[i]/2) || x[i] < (rad[i]/2)) {

    dx[i] = dx[i] > 0 ? -random(min, max) : random(min, max);

  }

​

  if (y[i] > height-(rad[i]/2) || y[i] < (rad[i]/2)) {

    dy[i] = dy[i] > 0 ? -random(min, max) : random(min, max);

  }  

  noStroke();

    ellipse(x[i], y[i], rad[i], rad[i]);

    //check if circles intercept, if so draw a line between them

  for(int j = 0; j<num; j++){

  if(i!=j && (dist(x[i], y[i], x[j],y[j])<=(rad[i]/2+rad[j]/2))){

    if(i%2<=0){

      stroke(255,50);

    }

    else{

      stroke(0,50);

    }

    line(x[i],y[i],x[j], y[j]);

  }

  }  

  }

}