// Dartmouth CS 2, Winter 2009, Chris Bailey-Kellogg
// Notes 11 | Sketch 6
// Inspired by Greenberg (Ch. 4 - tetherball)

Spring spring;

void setup()
{
  size(100,100);
  smooth();
  noStroke();
  background(0);

  spring = new Spring(width/2,height/2); 
}

void draw()
{
  background(0);
  spring.draw();
  spring.update();
}

void keyPressed()
{
  if (key=='k') { // half as much spring constant
    spring.k *= 0.5;
    println("spring:"+spring.k);
  }
  else if (key=='K') {
    if (spring.k < 0.5) {
      spring.k *= 2;
      println("spring:"+spring.k);
    }
  }
  else if (key=='d') { // half as much damping (measured as 1-d)
    spring.d = 1 - (1-spring.d)*0.5;
    println("damping:"+spring.d);
  }
  else if (key=='D') {
    spring.d = 1 - (1-spring.d)*2;
    println("damping:"+spring.d);
  }
}