マウスの近くに線を出現させる

/**
* Lines
*
* @author aa_debdeb
* @date 2015/01/04
*/ 

ArrayList<Line> lines;

void setup(){
  size(500, 500);
  frameRate(30);
  
  lines = new ArrayList<Line>();
  for(int i = 0; i < 300; i++){
    float s1 = random(width);
    float s2 = random(width);
    float t = random(width);
    if(random(1) < 0.5){
      lines.add(new Line(new PVector(s1, t), new PVector(s2, t)));
    } else {
      lines.add(new Line(new PVector(t, s1), new PVector(t, s2)));      
    }
  }
}

void draw(){
  background(0);
  for(Line l: lines){
    l.display();
  }
}

class Line {
  PVector p1, p2, center;
  float offset;
  Line(PVector p1, PVector p2){
    this.p1 = p1;
    this.p2 = p2;
    center = PVector.add(p1, p2);
    center.div(2);
    offset = random(100);
  }
  
  void display(){
    PVector mouse = new PVector(mouseX, mouseY);
    float dis = PVector.dist(mouse, center);
    if(dis < 100){
      stroke(255, map(sin(frameCount * 0.05 + offset), 0, 1, 0, 255));
      strokeWeight(1);
      line(p1.x, p1.y, p2.x, p2.y);
    }
  }
  
  
}