!7

p { pMain(HeartBeat); }

public sclass HeartBeat extends PApplet {

  public void settings() { size(1200, 400); }

  int x = 0;

  float py = 0;

  float scale = 2;

  public void setup() {

    background(0);

  }

  public void draw() {

    noStroke();

    fill(0,0,0,15);

    rect(0,0,width,height);

    translate(0,height/2);

    scale(scale);

    x++;

    x%=width/scale;

    float fx = py + random(-20,20);

    stroke(100,255,100);

    noFill();

    line(x-1,py, x,fx);

    py = minmax(fx, -height/2/scale, height/2/scale);

  }

}