lass-Intersections

var refresh;
var numLines = 12; 
var lineLength = 300; 
 
function setup() {
  createCanvas(720, 480);
  fill(255, 255, 255, 150); 
  stroke(255, 255, 255); 
  refresh = true;
}
 
function draw() {
  if (refresh) {
    background(200, 240, 240); 
    var lines = []; 
    for(var i = 0; i < numLines; i++) {
      var x = Math.random() * width; 
      var y = Math.random() * height; 
      var theta = Math.random() * Math.PI; 
      lines.push([x, y, theta]); 
      strokeWeight(2); 
      line(x, y, x + lineLength * Math.cos(theta), y + lineLength * Math.sin(theta)); 
      for(var j = 0; j < lines.length; j++) {
        var tan1 = Math.tan(theta)
        var sin2 = Math.sin(lines[j][2]); 
        var cos2 = Math.cos(lines[j][2]); 
        var dx = lines[j][0] - x; 
        var dy = lines[j][1] - y; 
        var s2 = (dx - dy / tan1) / (sin2 / tan1 - cos2); 
        var s1 =  (dx + s2 * cos2) / Math.cos(theta); 
        if(s1 < lineLength && s2 < lineLength && s1 > 0 && s2 > 0){
          strokeWeight(0); 
          ellipse(lines[j][0] + s2 * cos2, lines[j][1] + s2 * sin2, 15, 15); 
        }
      }      
    }
    refresh = false;
  }
}
 
function mousePressed() {
  refresh = true;
}