Program code - Plasma Ball

float[]x = new float[12];
float[]y = new float[12];
float[][]xy = {x,y};

void setup(){
  size(300,300);
}
void draw(){    
  background(10,3,255);
  noStroke();
  ellipse(width/2,height/2,width,height);
  fill(0);
  noStroke();
  smooth();
  frameRate(30);
  follow();

}
//follow the mouse
void follow(){
    for( int i =0 ; i<12; i++){
       xy[0][0] = (width/2);
       xy[1][0] = (height/2) ;
       xy[0][i] = mouseX ;
       xy[1][i] = mouseY;
  
  //Keep within the boundaries of the ellipse 
       float inside = ((sqrt(   ((mouseX-width/2)*(mouseX-width/2)) + ((mouseY-height/2)*(mouseY-height/2)) ))-width/2);
       if(inside        >1) {
          xy[0][0] = (width/2);
          xy[1][0] = (height/2);
          check(i);
        }
    }
   makeRect(xy);

}
//check that points stay in circle
void check(int i){
     float rndNumX1 = random(width);
     float rndNumY1 = random(height);
     float xStart = width/2;
     float yStart = height/2;
     float radius = width/2;
      if((sqrt(((rndNumX1-xStart)*(rndNumX1-xStart))+((rndNumY1-yStart)*(rndNumY1-yStart))) - radius) < 1) {
         xy[0][i] = rndNumX1;
         xy[1][i] = rndNumY1;
       }
       else
       {
        while(i<xy[0].length){
            check(i);
            i++;
        }
      }
 }
 void makeRect(float[][]pts){
   float a = random (255);
   float b = random (255);
   float c = random (255);
   stroke(a,b,c);
   smooth();
   int steps = 100;
   float scribVal = 2.0;
   for (int i = 0; i<pts[0].length; i++){
      strokeWeight(.7);
      beginShape(POINTS);
      vertex(pts[0][i], pts[1][i]);
      strokeWeight(1.2);
      if (i       >0){
         scribble(pts[0][i], pts[1][i], pts[0][i-1], pts[1][i-1], steps, scribVal*2);
         }
      }
      endShape();
}
void scribble(float x1, float y1, float x2, float y2, int steps, float scribVal){
  float xStep = (x2-x1)/steps;
  float yStep = (y2-y1)/steps;
  for (int i=0; i<steps; i++){
         float xStart = width/2;
         float yStart = height/2;
         float radius = width/2;
            if(i<steps-1){
                float scribA = (x1+=xStep+random(-scribVal, scribVal));
                float scribB =  (y1+= yStep+random(-scribVal, scribVal));
            if (  (sqrt(   ((scribA-xStart)*(scribA-xStart))+ ((scribB-yStart)*(scribB-yStart)))- radius) < 1) {
              beginShape(); 
              vertex(x1, y1);
              vertex(scribA ,scribB);
              endShape();
                 }
             }
      }
  }