/** 
A retro neon 3D line-grid by <a href="http://www.local-guru.net/blog/">guru</a>
*/
void setup() {
  size(300,300);
  smooth();
  frameRate(25);
}
int f =0;

void draw() {
  f++;
  float w = 12;
  background(0);
  
  stroke(0,255,0);
  line(0,150,300,150);
  float last = 0;
  for( int i =1; i < 12; i ++ ) {
    float o = map( f % w, 0, w, 0, 2*i + 1 );  
    line(0,150 + i*i + o,300,150+ i*i + o );
    last = i*i;
  }

  for( int i =0; i < 20; i ++ ) {
    line( 150 + i*10, 150, 150 + i*40, 300);
    line( 150 - i*10, 150, 150 - i*40, 300);
  }  
}